first commit for chrg

rt-thread/src/Kconfig

@@ -0,0 +1,448 @@
+menu "RT-Thread Kernel"
+
+rsource "klibc/Kconfig"
+
+config RT_NAME_MAX
+    int "The maximal size of kernel object name"
+    range 2 64
+    default 8
+    help
+        Each kernel object, such as thread, timer, semaphore etc, has a name,
+        the RT_NAME_MAX is the maximal size of this object name.
+
+config RT_USING_ARCH_DATA_TYPE
+    bool "Use the data types defined in ARCH_CPU"
+    default n
+    help
+        For the data type like, `rt_uint8/int8_t, rt_uint16/int16_t, rt_uint32/int32_t`,
+        BSP can define these basic data types in ARCH_CPU level.
+
+        Please re-define these data types in rtconfig_project.h file.
+
+config RT_USING_NANO
+    bool "Enable RT-Thread Nano"
+    default n
+    help
+        RT-Thread Nano is a very small size and refined hard real-time kernel,
+        which is suited for the extremely resource-constrained MCU system.
+
+config RT_USING_SMART
+    bool "Enable RT-Thread Smart (microkernel on kernel/userland)"
+    default n
+    select RT_USING_LWP
+    select RT_USING_DFS
+    select RT_USING_POSIX_CLOCKTIME
+    select RT_USING_DEVICE
+    select RT_USING_NULL
+    select RT_USING_ZERO
+    select RT_USING_RANDOM
+    select RT_USING_RTC
+    select RT_USING_POSIX_TIMER
+    select RT_USING_POSIX_CLOCK
+    select RT_USING_POSIX_FS
+    select RT_USING_POSIX_TERMIOS
+    select RT_USING_KTIME
+    select RT_USING_STDC_ATOMIC
+    select RT_USING_SYSTEM_WORKQUEUE
+    select RT_USING_CPU_USAGE_TRACER
+    select RT_USING_SCHED_THREAD_CTX
+    depends on ARCH_ARM_CORTEX_M || ARCH_ARM_ARM9 || ARCH_ARM_CORTEX_A || ARCH_ARMV8 || ARCH_RISCV64
+    depends on !RT_USING_NANO
+    help
+        RT-Thread Smart is a microkernel based operating system on RT-Thread.
+
+config RT_USING_AMP
+    bool "Enable AMP (Asymmetric Multi-Processing)"
+    default n
+    if RT_USING_AMP
+        choice
+            prompt "Select the AMP role"
+            default RT_AMP_SLAVE
+
+            config RT_AMP_MASTER
+            bool "amp role MASTER"
+
+            config RT_AMP_SLAVE
+            bool "amp role SLAVE"
+        endchoice
+    endif
+
+config RT_USING_SMP
+    bool "Enable SMP (Symmetric multiprocessing)"
+    default n
+    help
+        This option should be selected by machines which have an SMP-
+        capable CPU.
+        The only effect of this option is to make the SMP-related
+        options available to the user for configuration.
+
+config RT_CPUS_NR
+    int "Number of CPUs"
+    default 1
+    range 1 1 if !RT_USING_SMP && !RT_USING_AMP
+    help
+        Number of CPUs in the system
+
+config RT_ALIGN_SIZE
+    int "Alignment size for CPU architecture data access"
+    default 8
+    help
+        Alignment size for CPU architecture data access
+
+choice
+    prompt "The maximal level value of priority of thread"
+    default RT_THREAD_PRIORITY_32
+
+    config RT_THREAD_PRIORITY_8
+        bool "8"
+
+    config RT_THREAD_PRIORITY_32
+        bool "32"
+
+    config RT_THREAD_PRIORITY_256
+        bool "256"
+endchoice
+
+config RT_THREAD_PRIORITY_MAX
+    int
+    default 8   if RT_THREAD_PRIORITY_8
+    default 32  if RT_THREAD_PRIORITY_32
+    default 256 if RT_THREAD_PRIORITY_256
+
+config RT_TICK_PER_SECOND
+    int "Tick frequency, Hz"
+    range 10 1000
+    default 1000
+    help
+        System's tick frequency, Hz.
+
+config RT_USING_OVERFLOW_CHECK
+    bool "Using stack overflow checking"
+    default y if RT_USING_DEBUG
+    help
+        Enable thread stack overflow checking. The stack overflow is checking when
+        each thread switch.
+
+config RT_USING_HOOK
+    bool "Enable system hook"
+    default y
+    select RT_USING_IDLE_HOOK
+    help
+        Enable the hook function when system running, such as idle thread hook,
+        thread context switch etc.
+
+    if RT_USING_HOOK
+        config RT_HOOK_USING_FUNC_PTR
+            bool "Using function pointers as system hook"
+            default y
+    endif
+
+config RT_USING_HOOKLIST
+    bool "Enable hook list"
+    default n
+    help
+        Enable the hook list feature for rt-thread packages. With this, they can
+        plug in to the system on run-time.
+
+config RT_USING_IDLE_HOOK
+    bool "Enable IDLE Task hook"
+    default y if RT_USING_HOOK
+
+    if RT_USING_IDLE_HOOK
+        config RT_IDLE_HOOK_LIST_SIZE
+            int "The max size of idle hook list"
+            default 4
+            range 1 16
+            help
+                The system has a hook list. This is the hook list size.
+    endif
+
+config IDLE_THREAD_STACK_SIZE
+    int "The stack size of idle thread"
+    default 1024 if ARCH_CPU_64BIT
+    default 256
+
+config SYSTEM_THREAD_STACK_SIZE
+    int "The stack size of system thread (for defunct etc.)"
+    depends on RT_USING_SMP
+    default IDLE_THREAD_STACK_SIZE
+
+config RT_USING_TIMER_SOFT
+    bool "Enable software timer with a timer thread"
+    default y
+    help
+        the timeout function context of soft-timer is under a high priority timer
+        thread.
+
+if RT_USING_TIMER_SOFT
+    config RT_TIMER_THREAD_PRIO
+        int "The priority level value of timer thread"
+        default 4
+
+    config RT_TIMER_THREAD_STACK_SIZE
+        int "The stack size of timer thread"
+        default 2048 if ARCH_CPU_64BIT
+        default 512
+
+    config RT_USING_TIMER_ALL_SOFT
+        bool "Set all timer as soft timer"
+        default n
+endif
+
+config RT_USING_CPU_USAGE_TRACER
+    select RT_USING_HOOK
+    bool "Enable cpu usage tracing"
+    help
+        Enable cpu usage tracer for application like top.
+    default y if RT_USING_SMART
+    default n
+
+menu "kservice options"
+    config RT_USING_TINY_FFS
+        bool "Enable kservice to use tiny finding first bit set method"
+        default n
+endmenu
+
+menuconfig RT_USING_DEBUG
+    bool "Enable debugging features"
+    default y
+
+    if RT_USING_DEBUG
+        config RT_DEBUGING_ASSERT
+            bool "Enable assertion debugging"
+            default y
+
+        config RT_DEBUGING_COLOR
+            bool "Enable color debugging log"
+            default y
+
+        config RT_DEBUGING_CONTEXT
+            bool "Enable debugging of environment and context check"
+            default y
+
+        config RT_DEBUGING_AUTO_INIT
+            bool "Enable debugging of components automatic initialization"
+            default n
+
+        config RT_DEBUGING_SPINLOCK
+            bool "Enable spinlock debugging"
+            depends on RT_USING_SMP
+            default n
+
+        config RT_DEBUGING_CRITICAL
+            bool "Enable critical level tracing"
+            depends on RT_USING_SMP
+            default y if RT_USING_SMART
+            default n
+    endif
+
+config RT_USING_CI_ACTION
+    bool "Enable CI Action build mode"
+    select RT_USING_UTEST
+    select RT_UTEST_USING_AUTO_RUN
+    select RT_UTEST_USING_ALL_CASES
+    default n
+    help
+        Identify that the environment is CI Action.
+
+menu "Inter-Thread communication"
+
+    config RT_USING_SEMAPHORE
+        bool "Enable semaphore"
+        default y
+
+    config RT_USING_MUTEX
+        bool "Enable mutex"
+        default y
+
+    config RT_USING_EVENT
+        bool "Enable event flag"
+        default y
+
+    config RT_USING_MAILBOX
+        bool "Enable mailbox"
+        default y
+
+    config RT_USING_MESSAGEQUEUE
+        bool "Enable message queue"
+        default y
+
+    config RT_USING_MESSAGEQUEUE_PRIORITY
+        bool "Enable message queue priority"
+        depends on RT_USING_MESSAGEQUEUE
+        default n
+
+    config RT_USING_SIGNALS
+        bool "Enable signals"
+        select RT_USING_MEMPOOL
+        default n
+        help
+            A signal is an asynchronous notification sent to a specific thread
+            in order to notify it of an event that occurred.
+
+endmenu
+
+menu "Memory Management"
+
+    config RT_USING_MEMPOOL
+        bool "Using memory pool"
+        default y
+        help
+            Using static memory fixed partition
+
+    config RT_USING_SMALL_MEM
+        bool "Using Small Memory Algorithm"
+        default n
+        help
+            Using Small Memory Algorithm
+
+    config RT_USING_SLAB
+        bool "Using SLAB Memory Algorithm"
+        default n
+        help
+            The slab allocator of RT-Thread is a memory allocation algorithm
+             optimizedfor embedded systems based on the slab allocator
+             implemented by Matthew Dillon, founder of dragonfly BSD.
+             The original slab algorithm is an efficient kernel memory
+             allocation algorithm introduced by Jeff bonwick for
+             Solaris Operating System.
+
+    menuconfig RT_USING_MEMHEAP
+        bool "Using memheap Memory Algorithm"
+        default n
+
+        if RT_USING_MEMHEAP
+            choice
+                prompt "Memheap memory allocation mode"
+                default RT_MEMHEAP_FAST_MODE
+
+                config RT_MEMHEAP_FAST_MODE
+                    bool "fast mode"
+                    help
+                        Speed priority mode.
+                        As long as the memory block size meets the requirements, the search ends immediately.
+
+                config RT_MEMHEAP_BEST_MODE
+                    bool "best mode"
+                    help
+                        Best size first.
+                        The search does not end until the memory block of the most appropriate size is found
+            endchoice
+        endif
+
+    choice
+        prompt "System Heap Memory Management"
+        default RT_USING_SMALL_MEM_AS_HEAP
+
+        config RT_USING_SMALL_MEM_AS_HEAP
+            bool "Small Memory Algorithm"
+            select RT_USING_SMALL_MEM
+
+        config RT_USING_MEMHEAP_AS_HEAP
+            bool "Use memheap objects as heap"
+            select RT_USING_MEMHEAP
+
+            if RT_USING_MEMHEAP_AS_HEAP
+                config RT_USING_MEMHEAP_AUTO_BINDING
+                    bool "Use all of memheap objects as heap"
+                    default y
+            endif
+
+        config RT_USING_SLAB_AS_HEAP
+            bool "SLAB Algorithm for large memory"
+            select RT_USING_SLAB
+
+        config RT_USING_USERHEAP
+            bool "Use user heap"
+            help
+                If this option is selected, please implement these functions:
+                    rt_malloc(), rt_malloc_sethook()
+                    rt_free(),   rt_free_sethook()
+                    rt_calloc(), rt_realloc()
+                    rt_memory_info()
+                    rt_system_heap_init()
+
+        config RT_USING_NOHEAP
+            bool "Disable Heap"
+    endchoice
+
+    config RT_USING_MEMTRACE
+        bool "Enable memory trace"
+        default n
+        help
+            When enable RT_USING_MEMTRACE with shell, developer can call cmd:
+            1. memtrace
+                to dump memory block information.
+            2. memcheck
+                to check memory block to avoid memory overwritten.
+
+            And developer also can call memcheck() in each of scheduling
+            to check memory block to find which thread has wrongly modified
+            memory.
+
+    config RT_USING_HEAP_ISR
+        bool "Using heap in ISR"
+        default n
+        help
+            When this option is enabled, the critical zone will be protected with disable interrupt.
+
+    config RT_USING_HEAP
+        bool
+        default n if RT_USING_NOHEAP
+        default y if RT_USING_SMALL_MEM
+        default y if RT_USING_SLAB
+        default y if RT_USING_MEMHEAP_AS_HEAP
+        default y if RT_USING_USERHEAP
+endmenu
+
+config RT_USING_DEVICE
+    bool "Using device object"
+    depends on !RT_USING_NANO
+    default y
+
+config RT_USING_DEVICE_OPS
+    bool "Using ops for each device object"
+    depends on RT_USING_DEVICE
+    default n
+
+config RT_USING_INTERRUPT_INFO
+    bool "Enable additional interrupt trace information"
+    default n
+    help
+        Add name and counter information for interrupt trace.
+
+config RT_USING_THREADSAFE_PRINTF
+    bool "Enable thread safe kernel print service"
+    default y if RT_USING_SMP && RT_USING_SMART
+
+config RT_USING_CONSOLE
+    bool "Using console for rt_kprintf"
+    default y
+
+if RT_USING_CONSOLE
+    config RT_CONSOLEBUF_SIZE
+        int "the buffer size for console log printf"
+        default 256 if RT_USING_UTEST
+        default 128
+
+    config RT_CONSOLE_DEVICE_NAME
+        string "the device name for console"
+        default "uart1"
+
+endif
+
+config RT_VER_NUM
+    hex
+    default 0x50201
+    help
+        RT-Thread version number
+
+config RT_USING_STDC_ATOMIC
+    bool "Use atomic implemented in stdatomic.h"
+    default n
+
+config RT_BACKTRACE_LEVEL_MAX_NR
+    int "Max number of backtrace level"
+    default 32
+
+endmenu

rt-thread/src/SConscript

@@ -0,0 +1,67 @@
+from building import *
+import os
+
+src = Glob('*.c')
+cwd = GetCurrentDir()
+inc = [os.path.join(cwd, '..', 'include')]
+
+if GetDepend('RT_USING_SMALL_MEM') == False:
+    SrcRemove(src, ['mem.c'])
+
+if GetDepend('RT_USING_SLAB') == False:
+    SrcRemove(src, ['slab.c'])
+
+if GetDepend('RT_USING_MEMPOOL') == False:
+    SrcRemove(src, ['mempool.c'])
+
+if GetDepend('RT_USING_MEMHEAP') == False:
+    SrcRemove(src, ['memheap.c'])
+
+if GetDepend('RT_USING_SIGNALS') == False:
+    SrcRemove(src, ['signal.c'])
+
+if GetDepend('RT_USING_DEVICE') == False:
+    SrcRemove(src, ['device.c'])
+
+if GetDepend('RT_USING_SMP') == False:
+    SrcRemove(src, ['cpu_mp.c', 'scheduler_mp.c'])
+else:
+    SrcRemove(src, ['cpu_up.c', 'scheduler_up.c'])
+
+LOCAL_CFLAGS = ''
+LINKFLAGS = ''
+
+if rtconfig.PLATFORM in ['gcc']: # only for GCC
+    LOCAL_CFLAGS += ' -Wunused' # unused warning
+    LOCAL_CFLAGS += ' -Wformat -Wformat-security' # printf/scanf format warning
+    LOCAL_CFLAGS += ' -Warray-bounds -Wuninitialized' # memory access warning
+    LOCAL_CFLAGS += ' -Wreturn-type -Wcomment -Wswitch' # code style warning
+    LOCAL_CFLAGS += ' -Wparentheses -Wlogical-op ' # operation warning
+    LOCAL_CFLAGS += ' -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes' # function declaration warning
+    if 'mips' not in rtconfig.PREFIX: # mips toolchain does not support
+        LOCAL_CFLAGS += ' -Wimplicit-fallthrough' # implicit fallthrough warning
+        LOCAL_CFLAGS += ' -Wduplicated-cond -Wduplicated-branches' # duplicated condition warning
+    if rtconfig.ARCH not in ['sim']:
+        LINKFLAGS += ' -Wl,--gc-sections,--print-memory-usage' # remove unused sections and print memory usage
+
+if GetDepend('RT_USING_HOOKLIST') == True:
+    if rtconfig.PLATFORM in ['gcc', 'armclang']:
+        LOCAL_CFLAGS += ' -std=gnu99'
+    elif rtconfig.PLATFORM in ['armcc']:
+        LOCAL_CFLAGS += ' --c99 --gnu'
+
+if rtconfig.CROSS_TOOL == 'msvc':
+    group = DefineGroup('Kernel', src, depend=[''], CPPPATH=inc,
+                        LINKFLAGS=LINKFLAGS, LOCAL_CFLAGS=LOCAL_CFLAGS,
+                        CPPDEFINES=['__RTTHREAD__', '__RT_KERNEL_SOURCE__'])
+else:
+    group = DefineGroup('Kernel', src, depend=[''], CPPPATH=inc,
+                        LINKFLAGS=LINKFLAGS, LOCAL_CFLAGS=LOCAL_CFLAGS,
+                        CPPDEFINES=['__RTTHREAD__'], LOCAL_CPPDEFINES=['__RT_KERNEL_SOURCE__'])
+
+list = os.listdir(cwd)
+for item in list:
+    if os.path.isfile(os.path.join(cwd, item, 'SConscript')):
+        group = group + SConscript(os.path.join(item, 'SConscript'))
+
+Return('group')

rt-thread/src/clock.c

@@ -0,0 +1,261 @@
+/*
+ * Copyright (c) 2006-2024 RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2006-03-12     Bernard      first version
+ * 2006-05-27     Bernard      add support for same priority thread schedule
+ * 2006-08-10     Bernard      remove the last rt_schedule in rt_tick_increase
+ * 2010-03-08     Bernard      remove rt_passed_second
+ * 2010-05-20     Bernard      fix the tick exceeds the maximum limits
+ * 2010-07-13     Bernard      fix rt_tick_from_millisecond issue found by kuronca
+ * 2011-06-26     Bernard      add rt_tick_set function.
+ * 2018-11-22     Jesven       add per cpu tick
+ * 2020-12-29     Meco Man     implement rt_tick_get_millisecond()
+ * 2021-06-01     Meco Man     add critical section projection for rt_tick_increase()
+ * 2023-09-15     xqyjlj       perf rt_hw_interrupt_disable/enable
+ * 2023-10-16     RiceChen     fix: only the main core detection rt_timer_check(), in SMP mode
+ */
+
+#include <rthw.h>
+#include <rtthread.h>
+#include <rtatomic.h>
+
+#if defined(RT_USING_SMART) && defined(RT_USING_VDSO)
+#include <vdso.h>
+#endif
+
+#ifdef RT_USING_SMP
+#define rt_tick rt_cpu_index(0)->tick
+#else
+static volatile rt_atomic_t rt_tick = 0;
+#endif /* RT_USING_SMP */
+
+#if defined(RT_USING_HOOK) && defined(RT_HOOK_USING_FUNC_PTR)
+static void (*rt_tick_hook)(void);
+
+/**
+ * @addtogroup group_hook
+ */
+
+/**@{*/
+
+/**
+ * @brief This function will set a hook function, which will be invoked when tick increase
+ *
+ *
+ * @param hook the hook function
+ */
+void rt_tick_sethook(void (*hook)(void))
+{
+    rt_tick_hook = hook;
+}
+/**@}*/
+#endif /* RT_USING_HOOK */
+
+/**
+ * @addtogroup group_clock_management
+ */
+
+/**@{*/
+
+/**
+ * @brief    This function will return current tick from operating system startup.
+ *
+ * @return   Return current tick.
+ */
+rt_tick_t rt_tick_get(void)
+{
+    /* return the global tick */
+    return (rt_tick_t)rt_atomic_load(&(rt_tick));
+}
+RTM_EXPORT(rt_tick_get);
+
+/**
+ * @brief    This function will return delta tick from base.
+ *
+ * @param    base to consider
+ * 
+ * @return   Return delta tick.
+ */
+rt_tick_t rt_tick_get_delta(rt_tick_t base)
+{
+    rt_tick_t tnow = rt_tick_get();
+    if (tnow >= base)
+        return tnow - base;
+    return RT_TICK_MAX - base + tnow + 1;
+}
+RTM_EXPORT(rt_tick_get_delta);
+
+/**
+ * @brief    This function will set current tick.
+ *
+ * @param    tick is the value that you will set.
+ */
+void rt_tick_set(rt_tick_t tick)
+{
+    rt_atomic_store(&(rt_tick), tick);
+}
+
+#ifdef RT_USING_CPU_USAGE_TRACER
+static void _update_process_times(rt_tick_t tick)
+{
+    struct rt_thread *thread = rt_thread_self();
+    struct rt_cpu *pcpu = rt_cpu_self();
+
+    if (!LWP_IS_USER_MODE(thread))
+    {
+        thread->user_time += tick;
+        pcpu->cpu_stat.user += tick;
+    }
+    else
+    {
+        thread->system_time += tick;
+        if (thread == pcpu->idle_thread)
+        {
+            pcpu->cpu_stat.idle += tick;
+        }
+        else
+        {
+            pcpu->cpu_stat.system += tick;
+        }
+    }
+}
+
+#else
+
+#define _update_process_times(tick)
+#endif /* RT_USING_CPU_USAGE_TRACER */
+
+/**
+ * @brief    This function will notify kernel there is one tick passed.
+ *           Normally, this function is invoked by clock ISR.
+ */
+void rt_tick_increase(void)
+{
+    RT_ASSERT(rt_interrupt_get_nest() > 0);
+
+    RT_OBJECT_HOOK_CALL(rt_tick_hook, ());
+
+    /* tracing cpu usage */
+    _update_process_times(1);
+
+    /* increase the global tick */
+#ifdef RT_USING_SMP
+    /* get percpu and increase the tick */
+    rt_atomic_add(&(rt_cpu_self()->tick), 1);
+#else
+    rt_atomic_add(&(rt_tick), 1);
+#endif /* RT_USING_SMP */
+
+    /* check time slice */
+    rt_sched_tick_increase(1);
+
+    /* check timer */
+#ifdef RT_USING_SMP
+    if (rt_cpu_get_id() != 0)
+    {
+        return;
+    }
+#endif
+    rt_timer_check();
+}
+
+/**
+ * @brief    This function will notify kernel there is n tick passed.
+ *           Normally, this function is invoked by clock ISR.
+ */
+void rt_tick_increase_tick(rt_tick_t tick)
+{
+    RT_ASSERT(rt_interrupt_get_nest() > 0);
+
+    RT_OBJECT_HOOK_CALL(rt_tick_hook, ());
+
+    /* tracing cpu usage */
+    _update_process_times(tick);
+
+    /* increase the global tick */
+#ifdef RT_USING_SMP
+    /* get percpu and increase the tick */
+    rt_atomic_add(&(rt_cpu_self()->tick), tick);
+#else
+    rt_atomic_add(&(rt_tick), tick);
+#endif /* RT_USING_SMP */
+
+    /* check time slice */
+    rt_sched_tick_increase(tick);
+
+    /* check timer */
+#ifdef RT_USING_SMP
+    if (rt_cpu_get_id() != 0)
+    {
+        return;
+    }
+#endif
+    rt_timer_check();
+
+#ifdef RT_USING_VDSO
+    rt_vdso_update_glob_time();
+#endif
+}
+
+/**
+ * @brief    This function will calculate the tick from millisecond.
+ *
+ * @param    ms is the specified millisecond.
+ *              - Negative Number wait forever
+ *              - Zero not wait
+ *              - Max 0x7fffffff
+ *
+ * @return   Return the calculated tick.
+ */
+rt_tick_t rt_tick_from_millisecond(rt_int32_t ms)
+{
+    rt_tick_t tick;
+
+    if (ms < 0)
+    {
+        tick = (rt_tick_t)RT_WAITING_FOREVER;
+    }
+    else
+    {
+#if RT_TICK_PER_SECOND == 1000u
+        tick = ms;
+#else
+        tick = RT_TICK_PER_SECOND * (ms / 1000);
+        tick += (RT_TICK_PER_SECOND * (ms % 1000) + 999) / 1000;
+#endif /* RT_TICK_PER_SECOND == 1000u */
+    }
+
+    /* return the calculated tick */
+    return tick;
+}
+RTM_EXPORT(rt_tick_from_millisecond);
+
+/**
+ * @brief    This function will return the passed millisecond from boot.
+ *
+ * @note     if the value of RT_TICK_PER_SECOND is lower than 1000 or
+ *           is not an integral multiple of 1000, this function will not
+ *           provide the correct 1ms-based tick.
+ *
+ * @return   Return passed millisecond from boot.
+ */
+rt_weak rt_tick_t rt_tick_get_millisecond(void)
+{
+#if RT_TICK_PER_SECOND == 0 /* make cppcheck happy*/
+#error "RT_TICK_PER_SECOND must be greater than zero"
+#endif
+
+#if 1000 % RT_TICK_PER_SECOND == 0u
+    return rt_tick_get() * (1000u / RT_TICK_PER_SECOND);
+#else
+    #warning "rt-thread cannot provide a correct 1ms-based tick any longer,\
+    please redefine this function in another file by using a high-precision hard-timer."
+    return 0;
+#endif /* 1000 % RT_TICK_PER_SECOND == 0u */
+}
+
+/**@}*/

rt-thread/src/components.c

@@ -0,0 +1,286 @@
+/*
+ * Copyright (c) 2006-2022, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2012-09-20     Bernard      Change the name to components.c
+ *                             And all components related header files.
+ * 2012-12-23     Bernard      fix the pthread initialization issue.
+ * 2013-06-23     Bernard      Add the init_call for components initialization.
+ * 2013-07-05     Bernard      Remove initialization feature for MS VC++ compiler
+ * 2015-02-06     Bernard      Remove the MS VC++ support and move to the kernel
+ * 2015-05-04     Bernard      Rename it to components.c because compiling issue
+ *                             in some IDEs.
+ * 2015-07-29     Arda.Fu      Add support to use RT_USING_USER_MAIN with IAR
+ * 2018-11-22     Jesven       Add secondary cpu boot up
+ * 2023-09-15     xqyjlj       perf rt_hw_interrupt_disable/enable
+ */
+
+#include <rthw.h>
+#include <rtthread.h>
+
+#ifdef RT_USING_USER_MAIN
+#ifndef RT_MAIN_THREAD_STACK_SIZE
+#define RT_MAIN_THREAD_STACK_SIZE     2048
+#endif /* RT_MAIN_THREAD_STACK_SIZE */
+#ifndef RT_MAIN_THREAD_PRIORITY
+#define RT_MAIN_THREAD_PRIORITY       (RT_THREAD_PRIORITY_MAX / 3)
+#endif /* RT_MAIN_THREAD_PRIORITY */
+#endif /* RT_USING_USER_MAIN */
+
+#ifdef RT_USING_COMPONENTS_INIT
+/*
+ * Components Initialization will initialize some driver and components as following
+ * order:
+ * rti_start         --> 0
+ * BOARD_EXPORT      --> 1
+ * rti_board_end     --> 1.end
+ *
+ * DEVICE_EXPORT     --> 2
+ * COMPONENT_EXPORT  --> 3
+ * FS_EXPORT         --> 4
+ * ENV_EXPORT        --> 5
+ * APP_EXPORT        --> 6
+ *
+ * rti_end           --> 6.end
+ *
+ * These automatically initialization, the driver or component initial function must
+ * be defined with:
+ * INIT_BOARD_EXPORT(fn);
+ * INIT_DEVICE_EXPORT(fn);
+ * ...
+ * INIT_APP_EXPORT(fn);
+ * etc.
+ */
+static int rti_start(void)
+{
+    return 0;
+}
+INIT_EXPORT(rti_start, "0");
+
+static int rti_board_start(void)
+{
+    return 0;
+}
+INIT_EXPORT(rti_board_start, "0.end");
+
+static int rti_board_end(void)
+{
+    return 0;
+}
+INIT_EXPORT(rti_board_end, "1.end");
+
+static int rti_end(void)
+{
+    return 0;
+}
+INIT_EXPORT(rti_end, "6.end");
+
+/**
+ * @brief  Onboard components initialization. In this function, the board-level
+ *         initialization function will be called to complete the initialization
+ *         of the on-board peripherals.
+ */
+void rt_components_board_init(void)
+{
+#ifdef RT_DEBUGING_AUTO_INIT
+    int result;
+    const struct rt_init_desc *desc;
+    for (desc = &__rt_init_desc_rti_board_start; desc < &__rt_init_desc_rti_board_end; desc ++)
+    {
+        rt_kprintf("initialize %s\n", desc->fn_name);
+        result = desc->fn();
+        rt_kprintf(":%d done\n", result);
+    }
+#else
+    volatile const init_fn_t *fn_ptr;
+
+    for (fn_ptr = &__rt_init_rti_board_start; fn_ptr < &__rt_init_rti_board_end; fn_ptr++)
+    {
+        (*fn_ptr)();
+    }
+#endif /* RT_DEBUGING_AUTO_INIT */
+}
+
+/**
+ * @brief  RT-Thread Components Initialization.
+ */
+void rt_components_init(void)
+{
+#ifdef RT_DEBUGING_AUTO_INIT
+    int result;
+    const struct rt_init_desc *desc;
+
+    rt_kprintf("do components initialization.\n");
+    for (desc = &__rt_init_desc_rti_board_end; desc < &__rt_init_desc_rti_end; desc ++)
+    {
+        rt_kprintf("initialize %s\n", desc->fn_name);
+        result = desc->fn();
+        rt_kprintf(":%d done\n", result);
+    }
+#else
+    volatile const init_fn_t *fn_ptr;
+
+    for (fn_ptr = &__rt_init_rti_board_end; fn_ptr < &__rt_init_rti_end; fn_ptr ++)
+    {
+        (*fn_ptr)();
+    }
+#endif /* RT_DEBUGING_AUTO_INIT */
+}
+#endif /* RT_USING_COMPONENTS_INIT */
+
+#ifdef RT_USING_USER_MAIN
+
+void rt_application_init(void);
+void rt_hw_board_init(void);
+int rtthread_startup(void);
+
+#ifdef __ARMCC_VERSION
+extern int $Super$$main(void);
+/* re-define main function */
+int $Sub$$main(void)
+{
+    rtthread_startup();
+    return 0;
+}
+#elif defined(__ICCARM__)
+/* __low_level_init will auto called by IAR cstartup */
+extern void __iar_data_init3(void);
+int __low_level_init(void)
+{
+    // call IAR table copy function.
+    __iar_data_init3();
+    rtthread_startup();
+    return 0;
+}
+#elif defined(__GNUC__)
+/* Add -eentry to arm-none-eabi-gcc argument */
+int entry(void)
+{
+    rtthread_startup();
+    return 0;
+}
+#endif
+
+#ifndef RT_USING_HEAP
+/* if there is not enable heap, we should use static thread and stack. */
+rt_align(RT_ALIGN_SIZE)
+static rt_uint8_t main_thread_stack[RT_MAIN_THREAD_STACK_SIZE];
+struct rt_thread main_thread;
+#endif /* RT_USING_HEAP */
+
+/**
+ * @brief  The system main thread. In this thread will call the rt_components_init()
+ *         for initialization of RT-Thread Components and call the user's programming
+ *         entry main().
+ *
+ * @param  parameter is the arg of the thread.
+ */
+static void main_thread_entry(void *parameter)
+{
+    extern int main(void);
+    RT_UNUSED(parameter);
+
+#ifdef RT_USING_COMPONENTS_INIT
+    /* RT-Thread components initialization */
+    rt_components_init();
+#endif /* RT_USING_COMPONENTS_INIT */
+
+#ifdef RT_USING_SMP
+    rt_hw_secondary_cpu_up();
+#endif /* RT_USING_SMP */
+    /* invoke system main function */
+#ifdef __ARMCC_VERSION
+    {
+        extern int $Super$$main(void);
+        $Super$$main(); /* for ARMCC. */
+    }
+#elif defined(__ICCARM__) || defined(__GNUC__) || defined(__TASKING__) || defined(__TI_COMPILER_VERSION__)
+    main();
+#endif /* __ARMCC_VERSION */
+}
+
+/**
+ * @brief  This function will create and start the main thread, but this thread
+ *         will not run until the scheduler starts.
+ */
+void rt_application_init(void)
+{
+    rt_thread_t tid;
+
+#ifdef RT_USING_HEAP
+    tid = rt_thread_create("main", main_thread_entry, RT_NULL,
+                           RT_MAIN_THREAD_STACK_SIZE, RT_MAIN_THREAD_PRIORITY, 20);
+    RT_ASSERT(tid != RT_NULL);
+#else
+    rt_err_t result;
+
+    tid = &main_thread;
+    result = rt_thread_init(tid, "main", main_thread_entry, RT_NULL,
+                            main_thread_stack, sizeof(main_thread_stack), RT_MAIN_THREAD_PRIORITY, 20);
+    RT_ASSERT(result == RT_EOK);
+
+    /* if not define RT_USING_HEAP, using to eliminate the warning */
+    (void)result;
+#endif /* RT_USING_HEAP */
+
+    rt_thread_startup(tid);
+}
+
+/**
+ * @brief  This function will call all levels of initialization functions to complete
+ *         the initialization of the system, and finally start the scheduler.
+ *
+ * @return Normally never returns. If 0 is returned, the scheduler failed.
+ */
+int rtthread_startup(void)
+{
+#ifdef RT_USING_SMP
+    rt_hw_spin_lock_init(&_cpus_lock);
+#endif
+    rt_hw_local_irq_disable();
+
+    /* board level initialization
+     * NOTE: please initialize heap inside board initialization.
+     */
+    rt_hw_board_init();
+
+    /* show RT-Thread version */
+    rt_show_version();
+
+    /* timer system initialization */
+    rt_system_timer_init();
+
+    /* scheduler system initialization */
+    rt_system_scheduler_init();
+
+#ifdef RT_USING_SIGNALS
+    /* signal system initialization */
+    rt_system_signal_init();
+#endif /* RT_USING_SIGNALS */
+
+    /* create init_thread */
+    rt_application_init();
+
+    /* timer thread initialization */
+    rt_system_timer_thread_init();
+
+    /* idle thread initialization */
+    rt_thread_idle_init();
+
+    /* defunct thread initialization */
+    rt_thread_defunct_init();
+
+#ifdef RT_USING_SMP
+    rt_hw_spin_lock(&_cpus_lock);
+#endif /* RT_USING_SMP */
+
+    /* start scheduler */
+    rt_system_scheduler_start();
+
+    /* never reach here */
+    return 0;
+}
+#endif /* RT_USING_USER_MAIN */

rt-thread/src/cpu_mp.c

@@ -0,0 +1,236 @@
+/*
+ * Copyright (c) 2006-2023, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-10-30     Bernard      The first version
+ * 2023-09-15     xqyjlj       perf rt_hw_interrupt_disable/enable
+ * 2023-12-10     xqyjlj       spinlock should lock sched
+ * 2024-01-25     Shell        Using rt_exit_critical_safe
+ */
+#include <rthw.h>
+#include <rtthread.h>
+
+#ifdef RT_USING_SMART
+#include <lwp.h>
+#endif
+
+#ifdef RT_USING_DEBUG
+rt_base_t _cpus_critical_level;
+#endif /* RT_USING_DEBUG */
+
+static struct rt_cpu _cpus[RT_CPUS_NR];
+rt_hw_spinlock_t _cpus_lock;
+#if defined(RT_DEBUGING_SPINLOCK)
+void *_cpus_lock_owner = 0;
+void *_cpus_lock_pc = 0;
+
+#endif /* RT_DEBUGING_SPINLOCK */
+
+/**
+ * @brief   Initialize a static spinlock object.
+ *
+ * @param   lock is a pointer to the spinlock to initialize.
+ */
+void rt_spin_lock_init(struct rt_spinlock *lock)
+{
+    rt_hw_spin_lock_init(&lock->lock);
+}
+RTM_EXPORT(rt_spin_lock_init)
+
+/**
+ * @brief   This function will lock the spinlock, will lock the thread scheduler.
+ *
+ * @note    If the spinlock is locked, the current CPU will keep polling the spinlock state
+ *          until the spinlock is unlocked.
+ *
+ * @param   lock is a pointer to the spinlock.
+ */
+void rt_spin_lock(struct rt_spinlock *lock)
+{
+    rt_enter_critical();
+    rt_hw_spin_lock(&lock->lock);
+    RT_SPIN_LOCK_DEBUG(lock);
+}
+RTM_EXPORT(rt_spin_lock)
+
+/**
+ * @brief   This function will unlock the spinlock, will unlock the thread scheduler.
+ *
+ * @param   lock is a pointer to the spinlock.
+ */
+void rt_spin_unlock(struct rt_spinlock *lock)
+{
+    rt_base_t critical_level;
+    RT_SPIN_UNLOCK_DEBUG(lock, critical_level);
+    rt_hw_spin_unlock(&lock->lock);
+    rt_exit_critical_safe(critical_level);
+}
+RTM_EXPORT(rt_spin_unlock)
+
+/**
+ * @brief   This function will disable the local interrupt and then lock the spinlock, will lock the thread scheduler.
+ *
+ * @note    If the spinlock is locked, the current CPU will keep polling the spinlock state
+ *          until the spinlock is unlocked.
+ *
+ * @param   lock is a pointer to the spinlock.
+ *
+ * @return  Return current cpu interrupt status.
+ */
+rt_base_t rt_spin_lock_irqsave(struct rt_spinlock *lock)
+{
+    rt_base_t level;
+
+    level = rt_hw_local_irq_disable();
+    rt_enter_critical();
+    rt_hw_spin_lock(&lock->lock);
+    RT_SPIN_LOCK_DEBUG(lock);
+    return level;
+}
+RTM_EXPORT(rt_spin_lock_irqsave)
+
+/**
+ * @brief   This function will unlock the spinlock and then restore current cpu interrupt status, will unlock the thread scheduler.
+ *
+ * @param   lock is a pointer to the spinlock.
+ *
+ * @param   level is interrupt status returned by rt_spin_lock_irqsave().
+ */
+void rt_spin_unlock_irqrestore(struct rt_spinlock *lock, rt_base_t level)
+{
+    rt_base_t critical_level;
+
+    RT_SPIN_UNLOCK_DEBUG(lock, critical_level);
+    rt_hw_spin_unlock(&lock->lock);
+    rt_exit_critical_safe(critical_level);
+    rt_hw_local_irq_enable(level);
+}
+RTM_EXPORT(rt_spin_unlock_irqrestore)
+
+/**
+ * @brief   This fucntion will return current cpu object.
+ *
+ * @return  Return a pointer to the current cpu object.
+ */
+struct rt_cpu *rt_cpu_self(void)
+{
+    return &_cpus[rt_hw_cpu_id()];
+}
+
+/**
+ * @brief   This fucntion will return the cpu object corresponding to index.
+ *
+ * @param   index is the index of target cpu object.
+ *
+ * @return  Return a pointer to the cpu object corresponding to index.
+ */
+struct rt_cpu *rt_cpu_index(int index)
+{
+    return &_cpus[index];
+}
+
+/**
+ * @brief   This function will lock all cpus's scheduler and disable local irq.
+ *
+ * @return  Return current cpu interrupt status.
+ */
+rt_base_t rt_cpus_lock(void)
+{
+    rt_base_t level;
+    struct rt_cpu* pcpu;
+
+    level = rt_hw_local_irq_disable();
+    pcpu = rt_cpu_self();
+    if (pcpu->current_thread != RT_NULL)
+    {
+        rt_ubase_t lock_nest = rt_atomic_load(&(pcpu->current_thread->cpus_lock_nest));
+
+        rt_atomic_add(&(pcpu->current_thread->cpus_lock_nest), 1);
+        if (lock_nest == 0)
+        {
+            rt_enter_critical();
+            rt_hw_spin_lock(&_cpus_lock);
+#ifdef RT_USING_DEBUG
+            _cpus_critical_level = rt_critical_level();
+#endif /* RT_USING_DEBUG */
+
+#ifdef RT_DEBUGING_SPINLOCK
+            _cpus_lock_owner = pcpu->current_thread;
+            _cpus_lock_pc = __GET_RETURN_ADDRESS;
+#endif /* RT_DEBUGING_SPINLOCK */
+        }
+    }
+
+    return level;
+}
+RTM_EXPORT(rt_cpus_lock);
+
+/**
+ * @brief   This function will restore all cpus's scheduler and restore local irq.
+ *
+ * @param   level is interrupt status returned by rt_cpus_lock().
+ */
+void rt_cpus_unlock(rt_base_t level)
+{
+    struct rt_cpu* pcpu = rt_cpu_self();
+
+    if (pcpu->current_thread != RT_NULL)
+    {
+        rt_base_t critical_level = 0;
+        RT_ASSERT(rt_atomic_load(&(pcpu->current_thread->cpus_lock_nest)) > 0);
+        rt_atomic_sub(&(pcpu->current_thread->cpus_lock_nest), 1);
+
+        if (pcpu->current_thread->cpus_lock_nest == 0)
+        {
+#if defined(RT_DEBUGING_SPINLOCK)
+            _cpus_lock_owner = __OWNER_MAGIC;
+            _cpus_lock_pc = RT_NULL;
+#endif /* RT_DEBUGING_SPINLOCK */
+#ifdef RT_USING_DEBUG
+            critical_level = _cpus_critical_level;
+            _cpus_critical_level = 0;
+#endif /* RT_USING_DEBUG */
+            rt_hw_spin_unlock(&_cpus_lock);
+            rt_exit_critical_safe(critical_level);
+        }
+    }
+    rt_hw_local_irq_enable(level);
+}
+RTM_EXPORT(rt_cpus_unlock);
+
+/**
+ * This function is invoked by scheduler.
+ * It will restore the lock state to whatever the thread's counter expects.
+ * If target thread not locked the cpus then unlock the cpus lock.
+ *
+ * @param   thread is a pointer to the target thread.
+ */
+void rt_cpus_lock_status_restore(struct rt_thread *thread)
+{
+#if defined(ARCH_MM_MMU) && defined(RT_USING_SMART)
+    lwp_aspace_switch(thread);
+#endif
+    rt_sched_post_ctx_switch(thread);
+}
+RTM_EXPORT(rt_cpus_lock_status_restore);
+
+/* A safe API with debugging feature to be called in most codes */
+
+#undef rt_cpu_get_id
+/**
+ * @brief Get logical CPU ID
+ *
+ * @return logical CPU ID
+ */
+rt_base_t rt_cpu_get_id(void)
+{
+
+    RT_ASSERT(rt_sched_thread_is_binding(RT_NULL) ||
+              rt_hw_interrupt_is_disabled() ||
+              !rt_scheduler_is_available());
+
+    return rt_hw_cpu_id();
+}

rt-thread/src/cpu_up.c

@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 2006-2024, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2024-04-19     Shell        Fixup UP irq spinlock
+ * 2024-05-22     Shell        Add UP cpu object and
+ *                             maintain the rt_current_thread inside it
+ */
+#include <rthw.h>
+#include <rtthread.h>
+
+static struct rt_cpu _cpu;
+
+/**
+ * @brief   Initialize a static spinlock object.
+ *
+ * @param   lock is a pointer to the spinlock to initialize.
+ */
+void rt_spin_lock_init(struct rt_spinlock *lock)
+{
+    RT_UNUSED(lock);
+}
+
+/**
+ * @brief   This function will lock the spinlock, will lock the thread scheduler.
+ *
+ * @note    If the spinlock is locked, the current CPU will keep polling the spinlock state
+ *          until the spinlock is unlocked.
+ *
+ * @param   lock is a pointer to the spinlock.
+ */
+void rt_spin_lock(struct rt_spinlock *lock)
+{
+    rt_enter_critical();
+    RT_SPIN_LOCK_DEBUG(lock);
+}
+
+/**
+ * @brief   This function will unlock the spinlock, will unlock the thread scheduler.
+ *          If the scheduling function is called before unlocking, it will be scheduled in this function.
+ *
+ * @param   lock is a pointer to the spinlock.
+ */
+void rt_spin_unlock(struct rt_spinlock *lock)
+{
+    rt_base_t critical_level;
+    RT_SPIN_UNLOCK_DEBUG(lock, critical_level);
+    rt_exit_critical_safe(critical_level);
+}
+
+/**
+ * @brief   This function will disable the local interrupt and then lock the spinlock, will lock the thread scheduler.
+ *
+ * @note    If the spinlock is locked, the current CPU will keep polling the spinlock state
+ *          until the spinlock is unlocked.
+ *
+ * @param   lock is a pointer to the spinlock.
+ *
+ * @return  Return current cpu interrupt status.
+ */
+rt_base_t rt_spin_lock_irqsave(struct rt_spinlock *lock)
+{
+    rt_base_t level;
+    RT_UNUSED(lock);
+    level = rt_hw_interrupt_disable();
+    rt_enter_critical();
+    RT_SPIN_LOCK_DEBUG(lock);
+    return level;
+}
+
+/**
+ * @brief   This function will unlock the spinlock and then restore current cpu interrupt status, will unlock the thread scheduler.
+ *          If the scheduling function is called before unlocking, it will be scheduled in this function.
+ *
+ * @param   lock is a pointer to the spinlock.
+ *
+ * @param   level is interrupt status returned by rt_spin_lock_irqsave().
+ */
+void rt_spin_unlock_irqrestore(struct rt_spinlock *lock, rt_base_t level)
+{
+    rt_base_t critical_level;
+    RT_SPIN_UNLOCK_DEBUG(lock, critical_level);
+    rt_exit_critical_safe(critical_level);
+    rt_hw_interrupt_enable(level);
+}
+
+/**
+ * @brief   This fucntion will return current cpu object.
+ *
+ * @return  Return a pointer to the current cpu object.
+ */
+struct rt_cpu *rt_cpu_self(void)
+{
+    return &_cpu;
+}
+
+/**
+ * @brief   This fucntion will return the cpu object corresponding to index.
+ *
+ * @param   index is the index of target cpu object.
+ *
+ * @return  Return a pointer to the cpu object corresponding to index.
+ */
+struct rt_cpu *rt_cpu_index(int index)
+{
+    return index == 0 ? &_cpu : RT_NULL;
+}

rt-thread/src/defunct.c

@@ -0,0 +1,178 @@
+/*
+ * Copyright (c) 2006-2022, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2024-08-30     heyuanjie87  the first version
+ *
+ */
+
+#include <rthw.h>
+#include <rtthread.h>
+
+#ifndef SYSTEM_THREAD_STACK_SIZE
+#define SYSTEM_THREAD_STACK_SIZE IDLE_THREAD_STACK_SIZE
+#endif
+static rt_list_t          _rt_thread_defunct = RT_LIST_OBJECT_INIT(_rt_thread_defunct);
+static struct rt_spinlock _defunct_spinlock;
+#if defined(RT_USING_SMP) || defined(RT_USING_SMART)
+static struct rt_thread rt_system_thread;
+rt_align(RT_ALIGN_SIZE) static rt_uint8_t rt_system_stack[SYSTEM_THREAD_STACK_SIZE];
+static struct rt_semaphore system_sem;
+#endif
+
+/**
+ * @brief Enqueue a thread to defunct queue.
+ *
+ * @param thread the thread to be enqueued.
+ *
+ * @note It must be called between rt_hw_interrupt_disable and rt_hw_interrupt_enable
+ */
+void rt_thread_defunct_enqueue(rt_thread_t thread)
+{
+    rt_base_t level;
+    level = rt_spin_lock_irqsave(&_defunct_spinlock);
+    rt_list_insert_after(&_rt_thread_defunct, &RT_THREAD_LIST_NODE(thread));
+    rt_spin_unlock_irqrestore(&_defunct_spinlock, level);
+#if defined(RT_USING_SMP) || defined(RT_USING_SMART)
+    rt_sem_release(&system_sem);
+#endif
+}
+
+/**
+ * @brief Dequeue a thread from defunct queue.
+ */
+rt_thread_t rt_thread_defunct_dequeue(void)
+{
+    rt_base_t   level;
+    rt_thread_t thread = RT_NULL;
+    rt_list_t  *l      = &_rt_thread_defunct;
+
+    level = rt_spin_lock_irqsave(&_defunct_spinlock);
+    if (!rt_list_isempty(l))
+    {
+        thread = RT_THREAD_LIST_NODE_ENTRY(l->next);
+        rt_list_remove(&RT_THREAD_LIST_NODE(thread));
+    }
+    rt_spin_unlock_irqrestore(&_defunct_spinlock, level);
+
+    return thread;
+}
+
+/**
+ * @brief This function will perform system background job when system idle.
+ */
+void rt_defunct_execute(void)
+{
+    /* Loop until there is no dead thread. So one call to rt_defunct_execute
+     * will do all the cleanups. */
+    while (1)
+    {
+        rt_thread_t thread;
+        rt_bool_t   object_is_systemobject;
+        void (*cleanup)(struct rt_thread *tid);
+
+#ifdef RT_USING_MODULE
+        struct rt_dlmodule *module = RT_NULL;
+#endif
+        /* get defunct thread */
+        thread = rt_thread_defunct_dequeue();
+        if (thread == RT_NULL)
+        {
+            break;
+        }
+
+#ifdef RT_USING_MODULE
+        module = (struct rt_dlmodule *)thread->parent.module_id;
+        if (module)
+        {
+            dlmodule_destroy(module);
+        }
+#endif
+
+#ifdef RT_USING_SIGNALS
+        rt_thread_free_sig(thread);
+#endif
+
+        /* store the point of "thread->cleanup" avoid to lose */
+        cleanup = thread->cleanup;
+
+        /* if it's a system object, detach it */
+        object_is_systemobject = rt_object_is_systemobject((rt_object_t)thread);
+        if (object_is_systemobject == RT_TRUE)
+        {
+            /* detach this object */
+            rt_object_detach((rt_object_t)thread);
+        }
+
+        /* invoke thread cleanup */
+        if (cleanup != RT_NULL)
+        {
+            cleanup(thread);
+        }
+
+#ifdef RT_USING_HEAP
+#ifdef RT_USING_MEM_PROTECTION
+        if (thread->mem_regions != RT_NULL)
+        {
+            RT_KERNEL_FREE(thread->mem_regions);
+        }
+#endif
+        /* if need free, delete it */
+        if (object_is_systemobject == RT_FALSE)
+        {
+            /* release thread's stack */
+#ifdef RT_USING_HW_STACK_GUARD
+            RT_KERNEL_FREE(thread->stack_buf);
+#else
+            RT_KERNEL_FREE(thread->stack_addr);
+#endif
+            /* delete thread object */
+            rt_object_delete((rt_object_t)thread);
+        }
+#endif
+    }
+}
+
+#if defined(RT_USING_SMP) || defined(RT_USING_SMART)
+static void rt_thread_system_entry(void *parameter)
+{
+    RT_UNUSED(parameter);
+
+    while (1)
+    {
+        int ret = rt_sem_take(&system_sem, RT_WAITING_FOREVER);
+        if (ret != RT_EOK)
+        {
+            rt_kprintf("failed to sem_take() error %d\n", ret);
+            RT_ASSERT(0);
+        }
+        rt_defunct_execute();
+    }
+}
+#endif
+
+void rt_thread_defunct_init(void)
+{
+    RT_ASSERT(RT_THREAD_PRIORITY_MAX > 2);
+
+    rt_spin_lock_init(&_defunct_spinlock);
+
+#if defined(RT_USING_SMP) || defined(RT_USING_SMART)
+    rt_sem_init(&system_sem, "defunct", 0, RT_IPC_FLAG_FIFO);
+
+    /* create defunct thread */
+    rt_thread_init(&rt_system_thread,
+                   "tsystem",
+                   rt_thread_system_entry,
+                   RT_NULL,
+                   rt_system_stack,
+                   sizeof(rt_system_stack),
+                   RT_THREAD_PRIORITY_MAX - 2,
+                   32);
+    /* startup */
+    rt_thread_startup(&rt_system_thread);
+#endif
+}

rt-thread/src/idle.c

@@ -0,0 +1,219 @@
+/*
+ * Copyright (c) 2006-2022, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2006-03-23     Bernard      the first version
+ * 2010-11-10     Bernard      add cleanup callback function in thread exit.
+ * 2012-12-29     Bernard      fix compiling warning.
+ * 2013-12-21     Grissiom     let rt_thread_idle_excute loop until there is no
+ *                             dead thread.
+ * 2016-08-09     ArdaFu       add method to get the handler of the idle thread.
+ * 2018-02-07     Bernard      lock scheduler to protect tid->cleanup.
+ * 2018-07-14     armink       add idle hook list
+ * 2018-11-22     Jesven       add per cpu idle task
+ *                             combine the code of primary and secondary cpu
+ * 2021-11-15     THEWON       Remove duplicate work between idle and _thread_exit
+ * 2023-09-15     xqyjlj       perf rt_hw_interrupt_disable/enable
+ * 2023-11-07     xqyjlj       fix thread exit
+ * 2023-12-10     xqyjlj       add _hook_spinlock
+ */
+
+#include <rthw.h>
+#include <rtthread.h>
+
+#ifdef RT_USING_MODULE
+#include <dlmodule.h>
+#endif /* RT_USING_MODULE */
+
+#ifdef RT_USING_HOOK
+#ifndef RT_USING_IDLE_HOOK
+#define RT_USING_IDLE_HOOK
+#endif /* RT_USING_IDLE_HOOK */
+#endif /* RT_USING_HOOK */
+
+#ifndef IDLE_THREAD_STACK_SIZE
+#if defined (RT_USING_IDLE_HOOK) || defined(RT_USING_HEAP)
+#define IDLE_THREAD_STACK_SIZE  256
+#else
+#define IDLE_THREAD_STACK_SIZE  128
+#endif /* (RT_USING_IDLE_HOOK) || defined(RT_USING_HEAP) */
+#endif /* IDLE_THREAD_STACK_SIZE */
+
+#define _CPUS_NR                RT_CPUS_NR
+
+static struct rt_thread idle_thread[_CPUS_NR];
+rt_align(RT_ALIGN_SIZE)
+static rt_uint8_t idle_thread_stack[_CPUS_NR][IDLE_THREAD_STACK_SIZE];
+
+#ifdef RT_USING_IDLE_HOOK
+#ifndef RT_IDLE_HOOK_LIST_SIZE
+#define RT_IDLE_HOOK_LIST_SIZE  4
+#endif /* RT_IDLE_HOOK_LIST_SIZE */
+
+static void (*idle_hook_list[RT_IDLE_HOOK_LIST_SIZE])(void);
+static struct rt_spinlock _hook_spinlock;
+
+/**
+ * @brief This function sets a hook function to idle thread loop. When the system performs
+ *        idle loop, this hook function should be invoked.
+ *
+ * @param hook the specified hook function.
+ *
+ * @return RT_EOK: set OK.
+ *         -RT_EFULL: hook list is full.
+ *
+ * @note the hook function must be simple and never be blocked or suspend.
+ */
+rt_err_t rt_thread_idle_sethook(void (*hook)(void))
+{
+    rt_size_t i;
+    rt_err_t ret = -RT_EFULL;
+    rt_base_t level;
+
+    level = rt_spin_lock_irqsave(&_hook_spinlock);
+
+    for (i = 0; i < RT_IDLE_HOOK_LIST_SIZE; i++)
+    {
+        if (idle_hook_list[i] == RT_NULL)
+        {
+            idle_hook_list[i] = hook;
+            ret = RT_EOK;
+            break;
+        }
+    }
+
+    rt_spin_unlock_irqrestore(&_hook_spinlock, level);
+
+    return ret;
+}
+
+/**
+ * @brief delete the idle hook on hook list.
+ *
+ * @param hook the specified hook function.
+ *
+ * @return RT_EOK: delete OK.
+ *         -RT_ENOSYS: hook was not found.
+ */
+rt_err_t rt_thread_idle_delhook(void (*hook)(void))
+{
+    rt_size_t i;
+    rt_err_t ret = -RT_ENOSYS;
+    rt_base_t level;
+
+    level = rt_spin_lock_irqsave(&_hook_spinlock);
+
+    for (i = 0; i < RT_IDLE_HOOK_LIST_SIZE; i++)
+    {
+        if (idle_hook_list[i] == hook)
+        {
+            idle_hook_list[i] = RT_NULL;
+            ret = RT_EOK;
+            break;
+        }
+    }
+
+    rt_spin_unlock_irqrestore(&_hook_spinlock, level);
+
+    return ret;
+}
+
+#endif /* RT_USING_IDLE_HOOK */
+
+static void idle_thread_entry(void *parameter)
+{
+    RT_UNUSED(parameter);
+#ifdef RT_USING_SMP
+    if (rt_cpu_get_id() != 0)
+    {
+        while (1)
+        {
+            rt_hw_secondary_cpu_idle_exec();
+        }
+    }
+#endif /* RT_USING_SMP */
+
+    while (1)
+    {
+#ifdef RT_USING_IDLE_HOOK
+        rt_size_t i;
+        void (*idle_hook)(void);
+
+        for (i = 0; i < RT_IDLE_HOOK_LIST_SIZE; i++)
+        {
+            idle_hook = idle_hook_list[i];
+            if (idle_hook != RT_NULL)
+            {
+                idle_hook();
+            }
+        }
+#endif /* RT_USING_IDLE_HOOK */
+
+#if !defined(RT_USING_SMP) && !defined(RT_USING_SMART)
+    rt_defunct_execute();
+#endif
+
+#ifdef RT_USING_PM
+        void rt_system_power_manager(void);
+        rt_system_power_manager();
+#endif /* RT_USING_PM */
+    }
+}
+
+/**
+ * @brief This function will initialize idle thread, then start it.
+ *
+ * @note this function must be invoked when system init.
+ */
+void rt_thread_idle_init(void)
+{
+    rt_ubase_t i;
+#if RT_NAME_MAX > 0
+    char idle_thread_name[RT_NAME_MAX];
+#endif /* RT_NAME_MAX > 0 */
+
+#ifdef RT_USING_IDLE_HOOK
+    rt_spin_lock_init(&_hook_spinlock);
+#endif
+
+    for (i = 0; i < _CPUS_NR; i++)
+    {
+#if RT_NAME_MAX > 0
+        rt_snprintf(idle_thread_name, RT_NAME_MAX, "tidle%d", i);
+#endif /* RT_NAME_MAX > 0 */
+        rt_thread_init(&idle_thread[i],
+#if RT_NAME_MAX > 0
+                idle_thread_name,
+#else
+                "tidle",
+#endif /* RT_NAME_MAX > 0 */
+                idle_thread_entry,
+                RT_NULL,
+                &idle_thread_stack[i][0],
+                sizeof(idle_thread_stack[i]),
+                RT_THREAD_PRIORITY_MAX - 1,
+                32);
+#ifdef RT_USING_SMP
+        rt_thread_control(&idle_thread[i], RT_THREAD_CTRL_BIND_CPU, (void*)i);
+#endif /* RT_USING_SMP */
+
+        /* update */
+        rt_cpu_index(i)->idle_thread = &idle_thread[i];
+
+        /* startup */
+        rt_thread_startup(&idle_thread[i]);
+    }
+}
+
+/**
+ * @brief This function will get the handler of the idle thread.
+ */
+rt_thread_t rt_thread_idle_gethandler(void)
+{
+    int id = rt_cpu_get_id();
+
+    return (rt_thread_t)(&idle_thread[id]);
+}

rt-thread/src/irq.c

@@ -0,0 +1,157 @@
+/*
+ * Copyright (c) 2006-2022, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2006-02-24     Bernard      first version
+ * 2006-05-03     Bernard      add IRQ_DEBUG
+ * 2016-08-09     ArdaFu       add interrupt enter and leave hook.
+ * 2018-11-22     Jesven       rt_interrupt_get_nest function add disable irq
+ * 2021-08-15     Supperthomas fix the comment
+ * 2022-01-07     Gabriel      Moving __on_rt_xxxxx_hook to irq.c
+ * 2022-07-04     Yunjie       fix RT_DEBUG_LOG
+ * 2023-09-15     xqyjlj       perf rt_hw_interrupt_disable/enable
+ * 2024-01-05     Shell        Fixup of data racing in rt_interrupt_get_nest
+ * 2024-01-03     Shell        Support for interrupt context
+ */
+
+#include <rthw.h>
+#include <rtthread.h>
+
+#define DBG_TAG           "kernel.irq"
+#define DBG_LVL           DBG_INFO
+#include <rtdbg.h>
+
+#if defined(RT_USING_HOOK) && defined(RT_HOOK_USING_FUNC_PTR)
+
+static void (*rt_interrupt_enter_hook)(void);
+static void (*rt_interrupt_leave_hook)(void);
+
+/**
+ * @ingroup group_hook
+ *
+ * @brief This function set a hook function when the system enter a interrupt
+ *
+ * @note The hook function must be simple and never be blocked or suspend.
+ *
+ * @param hook the function point to be called
+ */
+void rt_interrupt_enter_sethook(void (*hook)(void))
+{
+    rt_interrupt_enter_hook = hook;
+}
+
+/**
+ * @ingroup group_hook
+ *
+ * @brief This function set a hook function when the system exit a interrupt.
+ *
+ * @note The hook function must be simple and never be blocked or suspend.
+ *
+ * @param hook the function point to be called
+ */
+void rt_interrupt_leave_sethook(void (*hook)(void))
+{
+    rt_interrupt_leave_hook = hook;
+}
+#endif /* RT_USING_HOOK */
+
+/**
+ * @addtogroup group_kernel_core
+ */
+
+/**@{*/
+
+#ifdef RT_USING_SMP
+#define rt_interrupt_nest rt_cpu_self()->irq_nest
+#else
+volatile rt_atomic_t rt_interrupt_nest = 0;
+#endif /* RT_USING_SMP */
+
+#ifdef ARCH_USING_IRQ_CTX_LIST
+void rt_interrupt_context_push(rt_interrupt_context_t this_ctx)
+{
+    struct rt_cpu *this_cpu = rt_cpu_self();
+    rt_slist_insert(&this_cpu->irq_ctx_head, &this_ctx->node);
+}
+
+void rt_interrupt_context_pop(void)
+{
+    struct rt_cpu *this_cpu = rt_cpu_self();
+    rt_slist_pop(&this_cpu->irq_ctx_head);
+}
+
+void *rt_interrupt_context_get(void)
+{
+    struct rt_cpu *this_cpu = rt_cpu_self();
+    return rt_slist_first_entry(&this_cpu->irq_ctx_head, struct rt_interrupt_context, node)->context;
+}
+#endif /* ARCH_USING_IRQ_CTX_LIST */
+
+/**
+ * @brief This function will be invoked by BSP, when enter interrupt service routine
+ *
+ * @note Please don't invoke this routine in application
+ *
+ * @see rt_interrupt_leave
+ */
+rt_weak void rt_interrupt_enter(void)
+{
+    rt_atomic_add(&(rt_interrupt_nest), 1);
+    RT_OBJECT_HOOK_CALL(rt_interrupt_enter_hook,());
+    LOG_D("irq has come..., irq current nest:%d",
+          (rt_int32_t)rt_atomic_load(&(rt_interrupt_nest)));
+}
+RTM_EXPORT(rt_interrupt_enter);
+
+
+/**
+ * @brief This function will be invoked by BSP, when leave interrupt service routine
+ *
+ * @note Please don't invoke this routine in application
+ *
+ * @see rt_interrupt_enter
+ */
+rt_weak void rt_interrupt_leave(void)
+{
+    LOG_D("irq is going to leave, irq current nest:%d",
+                 (rt_int32_t)rt_atomic_load(&(rt_interrupt_nest)));
+    RT_OBJECT_HOOK_CALL(rt_interrupt_leave_hook,());
+    rt_atomic_sub(&(rt_interrupt_nest), 1);
+
+}
+RTM_EXPORT(rt_interrupt_leave);
+
+
+/**
+ * @brief This function will return the nest of interrupt.
+ *
+ * User application can invoke this function to get whether current
+ * context is interrupt context.
+ *
+ * @return the number of nested interrupts.
+ */
+rt_weak rt_uint8_t rt_interrupt_get_nest(void)
+{
+    rt_uint8_t ret;
+    rt_base_t level;
+
+    level = rt_hw_local_irq_disable();
+    ret = rt_atomic_load(&rt_interrupt_nest);
+    rt_hw_local_irq_enable(level);
+    return ret;
+}
+RTM_EXPORT(rt_interrupt_get_nest);
+
+RTM_EXPORT(rt_hw_interrupt_disable);
+RTM_EXPORT(rt_hw_interrupt_enable);
+
+rt_weak rt_bool_t rt_hw_interrupt_is_disabled(void)
+{
+    return RT_FALSE;
+}
+RTM_EXPORT(rt_hw_interrupt_is_disabled);
+/**@}*/
+

rt-thread/src/klibc/Kconfig

@@ -0,0 +1,258 @@
+menu "klibc options"
+    menu "rt_vsnprintf options"
+        config RT_KLIBC_USING_LIBC_VSNPRINTF
+            bool "Enable rt_vsnprintf to use libc vsnprintf"
+            default n
+
+        config RT_KLIBC_USING_VSNPRINTF_LONGLONG
+            bool "Enable rt_vsnprintf function to support long-long format"
+            depends on !RT_KLIBC_USING_LIBC_VSNPRINTF
+            default n
+                help
+                    Support for the long long integral types (with the ll, z and t length modifiers for specifiers
+                    %d,%i,%o,%x,%X,%u, and with the %p specifier). Note: 'L' (long double) is not supported.
+
+        menuconfig RT_KLIBC_USING_VSNPRINTF_STANDARD
+            bool "Enable standard rt_vsnprintf version"
+            default y if ARCH_CPU_64BIT
+            default n
+            select RT_KLIBC_USING_VSNPRINTF_LONGLONG
+            depends on !RT_KLIBC_USING_LIBC_VSNPRINTF
+            help
+                Standard version of rt_vsnprintf, which is full function but higher stack usage.
+
+        if RT_KLIBC_USING_VSNPRINTF_STANDARD
+
+            config RT_KLIBC_USING_VSNPRINTF_DECIMAL_SPECIFIERS
+                bool "Support decimal notation floating point conversion specifiers (%f, %F)"
+                default y
+                help
+                    Support for the decimal notation floating point conversion specifiers (%f, %F)
+
+            config RT_KLIBC_USING_VSNPRINTF_EXPONENTIAL_SPECIFIERS
+                bool "Support exponential notation floating point conversion specifiers (%e, %g, %E, %G)"
+                default y
+                help
+                    Support for the exponential notation floating point conversion specifiers (%e, %g, %E, %G)
+
+            config RT_KLIBC_USING_VSNPRINTF_WRITEBACK_SPECIFIER
+                bool "Support length write-back specifier (%n)"
+                default y
+                help
+                    Support for the length write-back specifier (%n)
+
+            config RT_KLIBC_USING_VSNPRINTF_CHECK_NUL_IN_FORMAT_SPECIFIER
+                bool "safety check: no NULL end string"
+                default y if RT_USING_DEBUG
+                default n
+                help
+                    Be extra-safe, and don't assume format specifiers are completed correctly
+                    before the format string end.
+
+            config RT_KLIBC_USING_VSNPRINTF_MSVC_STYLE_INTEGER_SPECIFIERS
+                bool "Support MSVC style integer specifiers"
+                default n
+                help
+                    the integer format specifiers used in Microsoft's Visual C++ (MSVC) compiler.
+                    These specifiers, like %I64d for 64-bit integers, deviate slightly from the standard
+                    C format specifiers and are specific to MSVC. They allow for controlled formatting of
+                    integers in printf()-like functions, accommodating different integer sizes and ensuring
+                    compatibility with MSVC's environment. It's important to note that these specifiers might
+                    not be recognized or function in other compilers due to their MSVC-specific nature.
+
+            config RT_KLIBC_USING_VSNPRINTF_INTEGER_BUFFER_SIZE
+                int "'ntoa' conversion buffer size"
+                default 32
+                help
+                    'ntoa' conversion buffer size, this must be big enough to hold one converted
+                    numeric number including padded zeros (dynamically created on stack)
+
+            config RT_KLIBC_USING_VSNPRINTF_DECIMAL_BUFFER_SIZE
+                int "printing individual decimal numbers buffer size"
+                default 32
+                help
+                    size of the fixed (on-stack) buffer for printing individual decimal numbers.
+                    this must be big enough to hold one converted floating-point value including
+                    padded zeros.
+
+            config RT_KLIBC_USING_VSNPRINTF_FLOAT_PRECISION
+                int "floating point conversion specifiers"
+                default 6
+                help
+                    Default precision for the floating point conversion specifiers (the C standard sets this at 6)
+
+            config RT_KLIBC_USING_VSNPRINTF_MAX_INTEGRAL_DIGITS_FOR_DECIMAL
+                int "integral nums printed as float in rt_vsnprint"
+                default 9
+                help
+                    According to the C languages standard, printf() and related functions must be able to print any
+                    integral number in floating-point notation, regardless of length, when using the %f specifier -
+                    possibly hundreds of characters, potentially overflowing your buffers. In this implementation,
+                    all values beyond this threshold are switched to exponential notation.
+
+            config RT_KLIBC_USING_VSNPRINTF_LOG10_TAYLOR_TERMS
+                int "the number of terms in a Taylor series expansion of log_10(x)"
+                default 4
+                range 2 99
+                help
+                    The number of terms in a Taylor series expansion of log_10(x) to
+                    use for approximation - including the power-zero term (i.e. the
+                    value at the point of expansion).
+
+        endif
+    endmenu # rt_vsnprintf options
+
+    menu "rt_vsscanf options"
+        config RT_KLIBC_USING_LIBC_VSSCANF
+            bool "Enable rt_vsscanf to use libc vsscanf"
+            default n
+    endmenu # rt_vsscanf options
+
+    menu "rt_memset options"
+        config RT_KLIBC_USING_USER_MEMSET
+            bool "Enable rt_memset to use user-defined version"
+            default n
+
+        if !RT_KLIBC_USING_USER_MEMSET
+            config RT_KLIBC_USING_LIBC_MEMSET
+                bool "Enable rt_memset to use libc memset"
+                default n
+
+            config RT_KLIBC_USING_TINY_MEMSET
+                bool "Enable rt_memset to use tiny version"
+                depends on !RT_KLIBC_USING_LIBC_MEMSET
+                default n
+        endif
+    endmenu # rt_memset options
+
+    menu "rt_memcpy options"
+        config RT_KLIBC_USING_USER_MEMCPY
+            bool "Enable rt_memcpy to use user-defined version"
+            default n
+
+        if !RT_KLIBC_USING_USER_MEMCPY
+            config RT_KLIBC_USING_LIBC_MEMCPY
+                bool "Enable rt_memcpy to use libc memcpy"
+                default n
+
+            config RT_KLIBC_USING_TINY_MEMCPY
+                bool "Enable rt_memcpy to use tiny version"
+                depends on !RT_KLIBC_USING_LIBC_MEMCPY
+                default n
+        endif
+    endmenu # rt_memcpy options
+
+    menu "rt_memmove options"
+        config RT_KLIBC_USING_USER_MEMMOVE
+            bool "Enable rt_memmove to use user-defined version"
+            default n
+
+        if !RT_KLIBC_USING_USER_MEMMOVE
+            config RT_KLIBC_USING_LIBC_MEMMOVE
+                bool "Enable rt_memmove to use libc memmove"
+                default n
+        endif
+    endmenu # rt_memmove options
+
+    menu "rt_memcmp options"
+        config RT_KLIBC_USING_USER_MEMCMP
+            bool "Enable rt_memcmp to use user-defined version"
+            default n
+
+        if !RT_KLIBC_USING_USER_MEMCMP
+            config RT_KLIBC_USING_LIBC_MEMCMP
+                bool "Enable rt_memcmp to use libc memcmp"
+                default n
+        endif
+    endmenu # rt_memcmp options
+
+    menu "rt_strstr options"
+        config RT_KLIBC_USING_USER_STRSTR
+            bool "Enable rt_strstr to use user-defined version"
+            default n
+
+        if !RT_KLIBC_USING_USER_STRSTR
+            config RT_KLIBC_USING_LIBC_STRSTR
+                bool "Enable rt_strstr to use libc strstr"
+                default n
+        endif
+    endmenu # rt_strstr options
+
+    menu "rt_strcasecmp options"
+        config RT_KLIBC_USING_USER_STRCASECMP
+            bool "Enable rt_strcasecmp to use user-defined version"
+            default n
+    endmenu # rt_strcasecmp options
+
+    menu "rt_strncpy options"
+        config RT_KLIBC_USING_USER_STRNCPY
+            bool "Enable rt_strncpy to use user-defined version"
+            default n
+
+        if !RT_KLIBC_USING_USER_STRNCPY
+            config RT_KLIBC_USING_LIBC_STRNCPY
+                bool "Enable rt_strncpy to use libc strncpy"
+                default n
+        endif
+    endmenu # rt_strncpy options
+
+    menu "rt_strcpy options"
+        config RT_KLIBC_USING_USER_STRCPY
+            bool "Enable rt_strcpy to use user-defined version"
+            default n
+
+        if !RT_KLIBC_USING_USER_STRCPY
+            config RT_KLIBC_USING_LIBC_STRCPY
+                bool "Enable rt_strcpy to use libc strcpy"
+                default n
+        endif
+    endmenu # rt_strcpy options
+
+    menu "rt_strncmp options"
+        config RT_KLIBC_USING_USER_STRNCMP
+            bool "Enable rt_strncmp to use user-defined version"
+            default n
+
+        if !RT_KLIBC_USING_USER_STRNCMP
+            config RT_KLIBC_USING_LIBC_STRNCMP
+                bool "Enable rt_strncmp to use libc strncmp"
+                default n
+        endif
+    endmenu # rt_strncmp options
+
+    menu "rt_strcmp options"
+        config RT_KLIBC_USING_USER_STRCMP
+            bool "Enable rt_strcmp to use user-defined version"
+            default n
+
+        if !RT_KLIBC_USING_USER_STRCMP
+            config RT_KLIBC_USING_LIBC_STRCMP
+                bool "Enable rt_strcmp to use libc strcmp"
+                default n
+        endif
+    endmenu # rt_strcmp options
+
+    menu "rt_strlen options"
+        config RT_KLIBC_USING_USER_STRLEN
+            bool "Enable rt_strlen to use user-defined version"
+            default n
+
+        if !RT_KLIBC_USING_USER_STRLEN
+            config RT_KLIBC_USING_LIBC_STRLEN
+                bool "Enable rt_strlen to use libc strlen"
+                default n
+        endif
+    endmenu # rt_strlen options
+
+    menu "rt_strnlen options"
+        config RT_KLIBC_USING_USER_STRNLEN
+            bool "Enable rt_strnlen to use user-defined version"
+            default n
+    endmenu # rt_strnlen options
+
+    config RT_UTEST_TC_USING_KLIBC
+        bool "Enable klibc utest cases"
+        select RT_USING_UTEST
+        default n
+
+endmenu

rt-thread/src/klibc/SConscript

@@ -0,0 +1,23 @@
+from building import *
+import os
+
+cwd = GetCurrentDir()
+src = ['kerrno.c', 'kstdio.c', 'kstring.c']
+
+if not GetDepend(['RT_KLIBC_USING_LIBC_VSNPRINTF']):
+    if GetDepend(['RT_KLIBC_USING_VSNPRINTF_STANDARD']):
+        src += ['rt_vsnprintf_std.c']
+    else:
+        src += ['rt_vsnprintf_tiny.c']
+
+if not GetDepend(['RT_KLIBC_USING_LIBC_VSSCANF']):
+    src += ['rt_vsscanf.c']
+
+group = DefineGroup('klibc', src, depend = [''])
+
+list = os.listdir(cwd)
+for item in list:
+    if os.path.isfile(os.path.join(cwd, item, 'SConscript')):
+        group = group + SConscript(os.path.join(item, 'SConscript'))
+
+Return('group')

rt-thread/src/klibc/kerrno.c

@@ -0,0 +1,161 @@
+/*
+ * Copyright (c) 2006-2024, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2024-09-22     Meco Man     the first version
+ */
+
+#include <rtthread.h>
+
+/**
+ * @brief A global variable used to store the error code.
+ *
+ * This volatile static integer is used to store the most recent error code globally.
+ * Its volatile nature ensures that every read operation fetches the most current value,
+ * providing real-time error status across different parts of the program.
+ */
+static volatile int __rt_errno;
+
+/**
+ * @struct _errno_str_t
+ * @brief Structure for mapping error codes to corresponding error strings.
+ *
+ * This structure is used to create a mapping that associates an rt_err_t type error code
+ * with a corresponding error description string.
+ */
+struct _errno_str_t
+{
+    rt_err_t error;      /**< Error code of type rt_err_t, representing different kinds of errors. */
+    const char *str;     /**< Pointer to the error description string. */
+};
+
+/**
+ * @brief An array containing mappings of error codes to their corresponding error strings.
+ *
+ * This array uses the _errno_str_t structure to define several error codes and their
+ * corresponding error description strings. These mappings can be used at runtime
+ * to provide more readable error information.
+ */
+static struct _errno_str_t  rt_errno_strs[] =
+{
+    {RT_EOK     , "OK     "},  /**< Operation successful. */
+    {RT_ERROR   , "ERROR  "},  /**< General error. */
+    {RT_ETIMEOUT, "ETIMOUT"},  /**< Operation timed out. */
+    {RT_EFULL   , "ERSFULL"},  /**< Resource is full. */
+    {RT_EEMPTY  , "ERSEPTY"},  /**< Resource is empty. */
+    {RT_ENOMEM  , "ENOMEM "},  /**< Not enough memory. */
+    {RT_ENOSYS  , "ENOSYS "},  /**< Function not implemented. */
+    {RT_EBUSY   , "EBUSY  "},  /**< Resource is busy. */
+    {RT_EIO     , "EIO    "},  /**< Input/output error. */
+    {RT_EINTR   , "EINTRPT"},  /**< Interrupted system call. */
+    {RT_EINVAL  , "EINVAL "},  /**< Invalid argument. */
+    {RT_ENOENT  , "ENOENT "},  /**< No such file or directory. */
+    {RT_ENOSPC  , "ENOSPC "},  /**< No space left on device. */
+    {RT_EPERM   , "EPERM  "},  /**< Operation not permitted. */
+    {RT_ETRAP   , "ETRAP  "},  /**< Trap error. */
+};
+
+/**
+ * @brief This function return a pointer to a string that contains the
+ * message of error.
+ *
+ * @param error the errorno code
+ * @return a point to error message string
+ */
+const char *rt_strerror(rt_err_t error)
+{
+    int i = 0;
+
+    if (error < 0)
+        error = -error;
+
+    for (i = 0; i < sizeof(rt_errno_strs) / sizeof(rt_errno_strs[0]); i++)
+    {
+        if (rt_errno_strs[i].error == error)
+            return rt_errno_strs[i].str;
+    }
+
+    return "EUNKNOW";
+}
+RTM_EXPORT(rt_strerror);
+
+/**
+ * @brief This function gets the global errno for the current thread.
+ *
+ * @return errno
+ */
+rt_err_t rt_get_errno(void)
+{
+    rt_thread_t tid = RT_NULL;
+
+    if (rt_interrupt_get_nest() != 0)
+    {
+        /* it's in interrupt context */
+        return __rt_errno;
+    }
+
+    tid = rt_thread_self();
+    if (tid == RT_NULL)
+    {
+        return __rt_errno;
+    }
+
+    return tid->error;
+}
+RTM_EXPORT(rt_get_errno);
+
+/**
+ * @brief This function sets the global errno for the current thread.
+ *
+ * @param error is the errno shall be set.
+ */
+void rt_set_errno(rt_err_t error)
+{
+    rt_thread_t tid = RT_NULL;
+
+    if (rt_interrupt_get_nest() != 0)
+    {
+        /* it's in interrupt context */
+        __rt_errno = error;
+
+        return;
+    }
+
+    tid = rt_thread_self();
+    if (tid == RT_NULL)
+    {
+        __rt_errno = error;
+
+        return;
+    }
+
+    tid->error = error;
+}
+RTM_EXPORT(rt_set_errno);
+
+/**
+ * @brief This function returns the address of the current thread errno.
+ *
+ * @return The errno address.
+ */
+int *_rt_errno(void)
+{
+    rt_thread_t tid = RT_NULL;
+
+    if (rt_interrupt_get_nest() != 0)
+    {
+        return (int *)&__rt_errno;
+    }
+
+    tid = rt_thread_self();
+    if (tid != RT_NULL)
+    {
+        return (int *) & (tid->error);
+    }
+
+    return (int *)&__rt_errno;
+}
+RTM_EXPORT(_rt_errno);

rt-thread/src/klibc/kstdio.c

@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2006-2024, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2024-03-10     Meco Man     the first version
+ */
+
+#include <rtthread.h>
+#if defined(RT_KLIBC_USING_LIBC_VSSCANF) || \
+    defined(RT_KLIBC_USING_LIBC_VSNPRINTF)
+#include <stdio.h>
+#endif
+
+/**
+ * @brief  This function will fill a formatted string to buffer.
+ *
+ * @param  buf is the buffer to save formatted string.
+ *
+ * @param  size is the size of buffer.
+ *
+ * @param  fmt is the format parameters.
+ *
+ * @return The number of characters actually written to buffer.
+ */
+int rt_snprintf(char *buf, rt_size_t size, const char *fmt, ...)
+{
+    rt_int32_t n = 0;
+    va_list args;
+
+    va_start(args, fmt);
+    n = rt_vsnprintf(buf, size, fmt, args);
+    va_end(args);
+
+    return n;
+}
+RTM_EXPORT(rt_snprintf);
+
+/**
+ * @brief  This function will fill a formatted string to buffer.
+ *
+ * @param  buf is the buffer to save formatted string.
+ *
+ * @param  format is the format parameters.
+ *
+ * @param  arg_ptr is a list of variable parameters.
+ *
+ * @return The number of characters actually written to buffer.
+ */
+int rt_vsprintf(char *buf, const char *format, va_list arg_ptr)
+{
+    return rt_vsnprintf(buf, (rt_size_t) - 1, format, arg_ptr);
+}
+RTM_EXPORT(rt_vsprintf);
+
+/**
+ * @brief  This function will fill a formatted string to buffer
+ *
+ * @param  buf the buffer to save formatted string.
+ *
+ * @param  format is the format parameters.
+ *
+ * @return The number of characters actually written to buffer.
+ */
+int rt_sprintf(char *buf, const char *format, ...)
+{
+    rt_int32_t n = 0;
+    va_list arg_ptr;
+
+    va_start(arg_ptr, format);
+    n = rt_vsprintf(buf, format, arg_ptr);
+    va_end(arg_ptr);
+
+    return n;
+}
+RTM_EXPORT(rt_sprintf);
+
+#ifdef RT_KLIBC_USING_LIBC_VSNPRINTF
+int rt_vsnprintf(char *buf, rt_size_t size, const char *fmt, va_list args)
+{
+    return vsnprintf(buf, size, fmt, args);
+}
+#endif /* RT_KLIBC_USING_LIBC_VSNPRINTF */
+RTM_EXPORT(rt_vsnprintf);
+
+#ifdef RT_KLIBC_USING_LIBC_VSSCANF
+int rt_vsscanf(const char *buffer, const char *format, va_list ap)
+{
+    return vsscanf(buffer, format, ap);
+}
+#endif /* RT_KLIBC_USING_LIBC_VSSCANF */
+RTM_EXPORT(rt_vsscanf);
+
+/**
+ * @brief  This function parses a formatted string from the input string.
+ *
+ * @param  str the input string to be parsed.
+ *
+ * @param  format the format string that specifies how to interpret the input.
+ *
+ * @return The number of input items successfully matched and assigned.
+ */
+int rt_sscanf(const char *str, const char *format, ...)
+{
+    va_list ap;
+    int rv;
+
+    va_start(ap, format);
+    rv = rt_vsscanf(str, format, ap);
+    va_end(ap);
+
+    return rv;
+}
+RTM_EXPORT(rt_sscanf);

rt-thread/src/klibc/kstring.c

@@ -0,0 +1,559 @@
+/*
+ * Copyright (c) 2006-2024, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2024-03-10     Meco Man     the first version
+ */
+
+#include <rtthread.h>
+
+#if defined(RT_KLIBC_USING_LIBC_MEMSET) || \
+    defined(RT_KLIBC_USING_LIBC_MEMCPY) || \
+    defined(RT_KLIBC_USING_LIBC_MEMMOVE) || \
+    defined(RT_KLIBC_USING_LIBC_MEMCMP) || \
+    defined(RT_KLIBC_USING_LIBC_STRSTR) || \
+    defined(RT_KLIBC_USING_LIBC_STRNCPY) || \
+    defined(RT_KLIBC_USING_LIBC_STRCPY) || \
+    defined(RT_KLIBC_USING_LIBC_STRNCMP) || \
+    defined(RT_KLIBC_USING_LIBC_STRCMP) || \
+    defined(RT_KLIBC_USING_LIBC_STRLEN)
+#include <string.h>
+#endif
+
+/**
+ * @brief  This function will set the content of memory to specified value.
+ *
+ * @param  s is the address of source memory, point to the memory block to be filled.
+ *
+ * @param  c is the value to be set. The value is passed in int form, but the function
+ *         uses the unsigned character form of the value when filling the memory block.
+ *
+ * @param  count number of bytes to be set.
+ *
+ * @return The address of source memory.
+ */
+#ifndef RT_KLIBC_USING_USER_MEMSET
+void *rt_memset(void *s, int c, rt_ubase_t count)
+{
+#if defined(RT_KLIBC_USING_LIBC_MEMSET)
+    return memset(s, c, count);
+#elif defined(RT_KLIBC_USING_TINY_MEMSET)
+    char *xs = (char *)s;
+
+    while (count--)
+        *xs++ = c;
+
+    return s;
+#else
+
+#define LBLOCKSIZE      (sizeof(rt_ubase_t))
+#define UNALIGNED(X)    ((long)X & (LBLOCKSIZE - 1))
+#define TOO_SMALL(LEN)  ((LEN) < LBLOCKSIZE)
+
+    unsigned int i = 0;
+    char *m = (char *)s;
+    unsigned long buffer = 0;
+    unsigned long *aligned_addr = RT_NULL;
+    unsigned char d = (unsigned int)c & (unsigned char)(-1);  /* To avoid sign extension, copy C to an
+                                unsigned variable. (unsigned)((char)(-1))=0xFF for 8bit and =0xFFFF for 16bit: word independent */
+
+    RT_ASSERT(LBLOCKSIZE == 2 || LBLOCKSIZE == 4 || LBLOCKSIZE == 8);
+
+    if (!TOO_SMALL(count) && !UNALIGNED(s))
+    {
+        /* If we get this far, we know that count is large and s is word-aligned. */
+        aligned_addr = (unsigned long *)s;
+
+        /* Store d into each char sized location in buffer so that
+         * we can set large blocks quickly.
+         */
+        for (i = 0; i < LBLOCKSIZE; i++)
+        {
+            *(((unsigned char *)&buffer)+i) = d;
+        }
+
+        while (count >= LBLOCKSIZE * 4)
+        {
+            *aligned_addr++ = buffer;
+            *aligned_addr++ = buffer;
+            *aligned_addr++ = buffer;
+            *aligned_addr++ = buffer;
+            count -= 4 * LBLOCKSIZE;
+        }
+
+        while (count >= LBLOCKSIZE)
+        {
+            *aligned_addr++ = buffer;
+            count -= LBLOCKSIZE;
+        }
+
+        /* Pick up the remainder with a bytewise loop. */
+        m = (char *)aligned_addr;
+    }
+
+    while (count--)
+    {
+        *m++ = (char)d;
+    }
+
+    return s;
+
+#undef LBLOCKSIZE
+#undef UNALIGNED
+#undef TOO_SMALL
+#endif /* RT_KLIBC_USING_LIBC_MEMSET */
+}
+#endif /* RT_KLIBC_USING_USER_MEMSET */
+RTM_EXPORT(rt_memset);
+
+/**
+ * @brief  This function will copy memory content from source address to destination address.
+ *
+ * @param  dst is the address of destination memory, points to the copied content.
+ *
+ * @param  src  is the address of source memory, pointing to the data source to be copied.
+ *
+ * @param  count is the copied length.
+ *
+ * @return The address of destination memory
+ */
+#ifndef RT_KLIBC_USING_USER_MEMCPY
+void *rt_memcpy(void *dst, const void *src, rt_ubase_t count)
+{
+#if defined(RT_KLIBC_USING_LIBC_MEMCPY)
+    return memcpy(dst, src, count);
+#elif defined(RT_KLIBC_USING_TINY_MEMCPY)
+    char *tmp = (char *)dst, *s = (char *)src;
+    rt_ubase_t len = 0;
+
+    if (tmp <= s || tmp > (s + count))
+    {
+        while (count--)
+            *tmp ++ = *s ++;
+    }
+    else
+    {
+        for (len = count; len > 0; len --)
+            tmp[len - 1] = s[len - 1];
+    }
+
+    return dst;
+#else
+
+#define UNALIGNED(X, Y) \
+    (((long)X & (sizeof (long) - 1)) | ((long)Y & (sizeof (long) - 1)))
+#define BIGBLOCKSIZE    (sizeof (long) << 2)
+#define LITTLEBLOCKSIZE (sizeof (long))
+#define TOO_SMALL(LEN)  ((LEN) < BIGBLOCKSIZE)
+
+    char *dst_ptr = (char *)dst;
+    char *src_ptr = (char *)src;
+    long *aligned_dst = RT_NULL;
+    long *aligned_src = RT_NULL;
+    rt_ubase_t len = count;
+
+    /* If the size is small, or either SRC or DST is unaligned,
+    then punt into the byte copy loop.  This should be rare. */
+    if (!TOO_SMALL(len) && !UNALIGNED(src_ptr, dst_ptr))
+    {
+        aligned_dst = (long *)dst_ptr;
+        aligned_src = (long *)src_ptr;
+
+        /* Copy 4X long words at a time if possible. */
+        while (len >= BIGBLOCKSIZE)
+        {
+            *aligned_dst++ = *aligned_src++;
+            *aligned_dst++ = *aligned_src++;
+            *aligned_dst++ = *aligned_src++;
+            *aligned_dst++ = *aligned_src++;
+            len -= BIGBLOCKSIZE;
+        }
+
+        /* Copy one long word at a time if possible. */
+        while (len >= LITTLEBLOCKSIZE)
+        {
+            *aligned_dst++ = *aligned_src++;
+            len -= LITTLEBLOCKSIZE;
+        }
+
+        /* Pick up any residual with a byte copier. */
+        dst_ptr = (char *)aligned_dst;
+        src_ptr = (char *)aligned_src;
+    }
+
+    while (len--)
+        *dst_ptr++ = *src_ptr++;
+
+    return dst;
+#undef UNALIGNED
+#undef BIGBLOCKSIZE
+#undef LITTLEBLOCKSIZE
+#undef TOO_SMALL
+#endif /* RT_KLIBC_USING_LIBC_MEMCPY */
+}
+#endif /* RT_KLIBC_USING_USER_MEMCPY */
+RTM_EXPORT(rt_memcpy);
+
+/**
+ * @brief  This function will move memory content from source address to destination
+ * address. If the destination memory does not overlap with the source memory,
+ * the function is the same as memcpy().
+ *
+ * @param  dest is the address of destination memory, points to the copied content.
+ *
+ * @param  src is the address of source memory, point to the data source to be copied.
+ *
+ * @param  n is the copied length.
+ *
+ * @return The address of destination memory.
+ */
+#ifndef RT_KLIBC_USING_USER_MEMMOVE
+void *rt_memmove(void *dest, const void *src, rt_size_t n)
+{
+#ifdef RT_KLIBC_USING_LIBC_MEMMOVE
+    return memmove(dest, src, n);
+#else
+    char *tmp = (char *)dest, *s = (char *)src;
+
+    if (s < tmp && tmp < s + n)
+    {
+        tmp += n;
+        s += n;
+
+        while (n--)
+            *(--tmp) = *(--s);
+    }
+    else
+    {
+        while (n--)
+            *tmp++ = *s++;
+    }
+
+    return dest;
+#endif /* RT_KLIBC_USING_LIBC_MEMMOVE */
+}
+#endif /* RT_KLIBC_USING_USER_MEMMOVE */
+RTM_EXPORT(rt_memmove);
+
+/**
+ * @brief  This function will compare two areas of memory.
+ *
+ * @param  cs is a block of memory.
+ *
+ * @param  ct is another block of memory.
+ *
+ * @param  count is the size of the area.
+ *
+ * @return Compare the results:
+ *         If the result < 0, cs is smaller than ct.
+ *         If the result > 0, cs is greater than ct.
+ *         If the result = 0, cs is equal to ct.
+ */
+#ifndef RT_KLIBC_USING_USER_MEMCMP
+rt_int32_t rt_memcmp(const void *cs, const void *ct, rt_size_t count)
+{
+#ifdef RT_KLIBC_USING_LIBC_MEMCMP
+    return memcmp(cs, ct, count);
+#else
+    const unsigned char *su1 = RT_NULL, *su2 = RT_NULL;
+    int res = 0;
+
+    for (su1 = (const unsigned char *)cs, su2 = (const unsigned char *)ct; 0 < count; ++su1, ++su2, count--)
+        if ((res = *su1 - *su2) != 0)
+            break;
+
+    return res;
+#endif /* RT_KLIBC_USING_LIBC_MEMCMP */
+}
+#endif /* RT_KLIBC_USING_USER_MEMCMP */
+RTM_EXPORT(rt_memcmp);
+
+/**
+ * @brief  This function will return the first occurrence of a string, without the
+ * terminator '\0'.
+ *
+ * @param  s1 is the source string.
+ *
+ * @param  s2 is the find string.
+ *
+ * @return The first occurrence of a s2 in s1, or RT_NULL if no found.
+ */
+#ifndef RT_KLIBC_USING_USER_STRSTR
+char *rt_strstr(const char *s1, const char *s2)
+{
+#ifdef RT_KLIBC_USING_LIBC_STRSTR
+    return strstr(s1, s2);
+#else
+    int l1 = 0, l2 = 0;
+
+    l2 = rt_strlen(s2);
+    if (!l2)
+    {
+        return (char *)s1;
+    }
+
+    l1 = rt_strlen(s1);
+    while (l1 >= l2)
+    {
+        l1 --;
+        if (!rt_memcmp(s1, s2, l2))
+        {
+            return (char *)s1;
+        }
+
+        s1 ++;
+    }
+
+    return RT_NULL;
+#endif /* RT_KLIBC_USING_LIBC_STRSTR */
+}
+#endif /* RT_KLIBC_USING_USER_STRSTR */
+RTM_EXPORT(rt_strstr);
+
+/**
+ * @brief  This function will compare two strings while ignoring differences in case
+ *
+ * @param  a is the string to be compared.
+ *
+ * @param  b is the string to be compared.
+ *
+ * @return Compare the results:
+ *         If the result < 0, a is smaller than a.
+ *         If the result > 0, a is greater than a.
+ *         If the result = 0, a is equal to a.
+ */
+#ifndef RT_KLIBC_USING_USER_STRCASECMP
+rt_int32_t rt_strcasecmp(const char *a, const char *b)
+{
+    int ca = 0, cb = 0;
+
+    do
+    {
+        ca = *a++ & 0xff;
+        cb = *b++ & 0xff;
+        if (ca >= 'A' && ca <= 'Z')
+            ca += 'a' - 'A';
+        if (cb >= 'A' && cb <= 'Z')
+            cb += 'a' - 'A';
+    }
+    while (ca == cb && ca != '\0');
+
+    return ca - cb;
+}
+#endif /* RT_KLIBC_USING_USER_STRCASECMP */
+RTM_EXPORT(rt_strcasecmp);
+
+/**
+ * @brief  This function will copy string no more than n bytes.
+ *
+ * @param  dst points to the address used to store the copied content.
+ *
+ * @param  src is the string to be copied.
+ *
+ * @param  n is the maximum copied length.
+ *
+ * @return The address where the copied content is stored.
+ */
+#ifndef RT_KLIBC_USING_USER_STRNCPY
+char *rt_strncpy(char *dst, const char *src, rt_size_t n)
+{
+#ifdef RT_KLIBC_USING_LIBC_STRNCPY
+    return strncpy(dst, src, n);
+#else
+    if (n != 0)
+    {
+        char *d = dst;
+        const char *s = src;
+
+        do
+        {
+            if ((*d++ = *s++) == 0)
+            {
+                /* NUL pad the remaining n-1 bytes */
+                while (--n != 0)
+                {
+                    *d++ = 0;
+                }
+
+                break;
+            }
+        } while (--n != 0);
+    }
+
+    return (dst);
+#endif /* RT_KLIBC_USING_LIBC_STRNCPY */
+}
+#endif /* RT_KLIBC_USING_USER_STRNCPY */
+RTM_EXPORT(rt_strncpy);
+
+/**
+ * @brief  This function will copy string.
+ *
+ * @param  dst points to the address used to store the copied content.
+ *
+ * @param  src is the string to be copied.
+ *
+ * @return The address where the copied content is stored.
+ */
+#ifndef RT_KLIBC_USING_USER_STRCPY
+char *rt_strcpy(char *dst, const char *src)
+{
+#ifdef RT_KLIBC_USING_LIBC_STRCPY
+    return strcpy(dst, src);
+#else
+    char *dest = dst;
+
+    while (*src != '\0')
+    {
+        *dst = *src;
+        dst++;
+        src++;
+    }
+
+    *dst = '\0';
+    return dest;
+#endif /* RT_KLIBC_USING_LIBC_STRCPY */
+}
+#endif /* RT_KLIBC_USING_USER_STRCPY */
+RTM_EXPORT(rt_strcpy);
+
+/**
+ * @brief  This function will compare two strings with specified maximum length.
+ *
+ * @param  cs is the string to be compared.
+ *
+ * @param  ct is the string to be compared.
+ *
+ * @param  count is the maximum compare length.
+ *
+ * @return Compare the results:
+ *         If the result < 0, cs is smaller than ct.
+ *         If the result > 0, cs is greater than ct.
+ *         If the result = 0, cs is equal to ct.
+ */
+#ifndef RT_KLIBC_USING_USER_STRNCMP
+rt_int32_t rt_strncmp(const char *cs, const char *ct, rt_size_t count)
+{
+#ifdef RT_KLIBC_USING_LIBC_STRNCMP
+    return strncmp(cs, ct, count);
+#else
+    signed char res = 0;
+
+    while (count)
+    {
+        if ((res = *cs - *ct++) != 0 || !*cs++)
+        {
+            break;
+        }
+
+        count --;
+    }
+
+    return res;
+#endif /* RT_KLIBC_USING_LIBC_STRNCMP */
+}
+#endif /* RT_KLIBC_USING_USER_STRNCMP */
+RTM_EXPORT(rt_strncmp);
+
+/**
+ * @brief  This function will compare two strings without specified length.
+ *
+ * @param  cs is the string to be compared.
+ *
+ * @param  ct is the string to be compared.
+ *
+ * @return Compare the results:
+ *         If the result < 0, cs is smaller than ct.
+ *         If the result > 0, cs is greater than ct.
+ *         If the result = 0, cs is equal to ct.
+ */
+#ifndef RT_KLIBC_USING_USER_STRCMP
+rt_int32_t rt_strcmp(const char *cs, const char *ct)
+{
+#ifdef RT_KLIBC_USING_LIBC_STRCMP
+    return strcmp(cs, ct);
+#else
+    while (*cs && *cs == *ct)
+    {
+        cs++;
+        ct++;
+    }
+
+    return (*cs - *ct);
+#endif /* RT_KLIBC_USING_LIBC_STRCMP */
+}
+#endif /* RT_KLIBC_USING_USER_STRCMP */
+RTM_EXPORT(rt_strcmp);
+
+/**
+ * @brief  This function will return the length of a string, which terminate will
+ * null character.
+ *
+ * @param  s is the string
+ *
+ * @return The length of string.
+ */
+#ifndef RT_KLIBC_USING_USER_STRLEN
+rt_size_t rt_strlen(const char *s)
+{
+#ifdef RT_KLIBC_USING_LIBC_STRLEN
+    return strlen(s);
+#else
+    const char *sc = RT_NULL;
+    for (sc = s; *sc != '\0'; ++sc);
+    return sc - s;
+#endif /* RT_KLIBC_USING_LIBC_STRLEN */
+}
+#endif /* RT_KLIBC_USING_USER_STRLEN */
+RTM_EXPORT(rt_strlen);
+
+/**
+ * @brief  The  strnlen()  function  returns the number of characters in the
+ * string pointed to by s, excluding the terminating null byte ('\0'),
+ * but at most maxlen.  In doing this, strnlen() looks only at the
+ * first maxlen characters in the string pointed to by s and never
+ * beyond s+maxlen.
+ *
+ * @param  s is the string.
+ *
+ * @param  maxlen is the max size.
+ *
+ * @return The length of string.
+ */
+#ifndef RT_KLIBC_USING_USER_STRNLEN
+rt_size_t rt_strnlen(const char *s, rt_ubase_t maxlen)
+{
+    const char *sc;
+    for (sc = s; *sc != '\0' && (rt_ubase_t)(sc - s) < maxlen; ++sc);
+    return sc - s;
+}
+#endif /* RT_KLIBC_USING_USER_STRNLEN */
+RTM_EXPORT(rt_strnlen);
+
+#ifdef RT_USING_HEAP
+/**
+ * @brief  This function will duplicate a string.
+ *
+ * @param  s is the string to be duplicated.
+ *
+ * @return The string address of the copy.
+ */
+char *rt_strdup(const char *s)
+{
+    rt_size_t len = rt_strlen(s) + 1;
+    char *tmp = (char *)rt_malloc(len);
+
+    if (!tmp)
+    {
+        return RT_NULL;
+    }
+
+    rt_memcpy(tmp, s, len);
+
+    return tmp;
+}
+RTM_EXPORT(rt_strdup);
+#endif /* RT_USING_HEAP */

rt-thread/src/klibc/rt_vsnprintf_tiny.c

@@ -0,0 +1,611 @@
+/*
+ * Copyright (c) 2006-2024, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2024-11-19     Meco Man     the first version
+ */
+
+#include <rtthread.h>
+
+#define _ISDIGIT(c)  ((unsigned)((c) - '0') < 10)
+
+/**
+ * @brief  This function will duplicate a string.
+ *
+ * @param  n is the string to be duplicated.
+ *
+ * @param  base is support divide instructions value.
+ *
+ * @return the duplicated string pointer.
+ */
+#ifdef RT_KLIBC_USING_VSNPRINTF_LONGLONG
+rt_inline int divide(unsigned long long *n, int base)
+#else
+rt_inline int divide(unsigned long *n, int base)
+#endif /* RT_KLIBC_USING_VSNPRINTF_LONGLONG */
+{
+    int res;
+
+    /* optimized for processor which does not support divide instructions. */
+#ifdef RT_KLIBC_USING_VSNPRINTF_LONGLONG
+    res = (int)((*n) % base);
+    *n = (long long)((*n) / base);
+#else
+    res = (int)((*n) % base);
+    *n = (long)((*n) / base);
+#endif
+
+    return res;
+}
+
+rt_inline int skip_atoi(const char **s)
+{
+    int i = 0;
+    while (_ISDIGIT(**s))
+        i = i * 10 + *((*s)++) - '0';
+
+    return i;
+}
+
+#define ZEROPAD     (1 << 0)    /* pad with zero */
+#define SIGN        (1 << 1)    /* unsigned/signed long */
+#define PLUS        (1 << 2)    /* show plus */
+#define SPACE       (1 << 3)    /* space if plus */
+#define LEFT        (1 << 4)    /* left justified */
+#define SPECIAL     (1 << 5)    /* 0x */
+#define LARGE       (1 << 6)    /* use 'ABCDEF' instead of 'abcdef' */
+
+static char *print_number(char *buf,
+                          char *end,
+#ifdef RT_KLIBC_USING_VSNPRINTF_LONGLONG
+                          unsigned long long  num,
+#else
+                          unsigned long  num,
+#endif /* RT_KLIBC_USING_VSNPRINTF_LONGLONG */
+                          int   base,
+                          int   qualifier,
+                          int   s,
+                          int   precision,
+                          int   type)
+{
+    char c = 0, sign = 0;
+#ifdef RT_KLIBC_USING_VSNPRINTF_LONGLONG
+    char tmp[64] = {0};
+#else
+    char tmp[32] = {0};
+#endif /* RT_KLIBC_USING_VSNPRINTF_LONGLONG */
+    int precision_bak = precision;
+    const char *digits = RT_NULL;
+    static const char small_digits[] = "0123456789abcdef";
+    static const char large_digits[] = "0123456789ABCDEF";
+    int i = 0;
+    int size = 0;
+
+    size = s;
+
+    digits = (type & LARGE) ? large_digits : small_digits;
+    if (type & LEFT)
+    {
+        type &= ~ZEROPAD;
+    }
+
+    c = (type & ZEROPAD) ? '0' : ' ';
+
+    /* get sign */
+    sign = 0;
+    if (type & SIGN)
+    {
+        switch (qualifier)
+        {
+        case 'h':
+            if ((rt_int16_t)num < 0)
+            {
+                sign = '-';
+                num = (rt_uint16_t)-num;
+            }
+            break;
+        case 'L':
+        case 'l':
+            if ((long)num < 0)
+            {
+                sign = '-';
+                num = (unsigned long)-num;
+            }
+            break;
+        case 0:
+        default:
+            if ((rt_int32_t)num < 0)
+            {
+                sign = '-';
+                num = (rt_uint32_t)-num;
+            }
+            break;
+        }
+
+        if (sign != '-')
+        {
+            if (type & PLUS)
+            {
+                sign = '+';
+            }
+            else if (type & SPACE)
+            {
+                sign = ' ';
+            }
+        }
+    }
+
+    if (type & SPECIAL)
+    {
+        if (base == 2 || base == 16)
+        {
+            size -= 2;
+        }
+        else if (base == 8)
+        {
+            size--;
+        }
+    }
+
+    i = 0;
+    if (num == 0)
+    {
+        tmp[i++] = '0';
+    }
+    else
+    {
+        while (num != 0)
+            tmp[i++] = digits[divide(&num, base)];
+    }
+
+    if (i > precision)
+    {
+        precision = i;
+    }
+    size -= precision;
+
+    if (!(type & (ZEROPAD | LEFT)))
+    {
+        if ((sign) && (size > 0))
+        {
+            size--;
+        }
+
+        while (size-- > 0)
+        {
+            if (buf < end)
+            {
+                *buf = ' ';
+            }
+
+            ++ buf;
+        }
+    }
+
+    if (sign)
+    {
+        if (buf < end)
+        {
+            *buf = sign;
+        }
+        -- size;
+        ++ buf;
+    }
+
+    if (type & SPECIAL)
+    {
+        if (base == 2)
+        {
+            if (buf < end)
+                *buf = '0';
+            ++ buf;
+            if (buf < end)
+                *buf = 'b';
+            ++ buf;
+        }
+        else if (base == 8)
+        {
+            if (buf < end)
+                *buf = '0';
+            ++ buf;
+        }
+        else if (base == 16)
+        {
+            if (buf < end)
+            {
+                *buf = '0';
+            }
+
+            ++ buf;
+            if (buf < end)
+            {
+                *buf = type & LARGE ? 'X' : 'x';
+            }
+            ++ buf;
+        }
+    }
+
+    /* no align to the left */
+    if (!(type & LEFT))
+    {
+        while (size-- > 0)
+        {
+            if (buf < end)
+            {
+                *buf = c;
+            }
+
+            ++ buf;
+        }
+    }
+
+    while (i < precision--)
+    {
+        if (buf < end)
+        {
+            *buf = '0';
+        }
+
+        ++ buf;
+    }
+
+    /* put number in the temporary buffer */
+    while (i-- > 0 && (precision_bak != 0))
+    {
+        if (buf < end)
+        {
+            *buf = tmp[i];
+        }
+
+        ++ buf;
+    }
+
+    while (size-- > 0)
+    {
+        if (buf < end)
+        {
+            *buf = ' ';
+        }
+
+        ++ buf;
+    }
+
+    return buf;
+}
+
+#if (defined(__GNUC__) && !defined(__ARMCC_VERSION) /* GCC */) && (__GNUC__ >= 7)
+/* Disable "-Wimplicit-fallthrough" below GNUC V7 */
+#pragma GCC diagnostic push
+/* ignore warning: this statement may fall through */
+#pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
+#endif /* (defined(__GNUC__) && !defined(__ARMCC_VERSION)) && (__GNUC__ >= 7 */
+/**
+ * @brief  This function will fill a formatted string to buffer.
+ *
+ * @param  buf is the buffer to save formatted string.
+ *
+ * @param  size is the size of buffer.
+ *
+ * @param  fmt is the format parameters.
+ *
+ * @param  args is a list of variable parameters.
+ *
+ * @return The number of characters actually written to buffer.
+ */
+int rt_vsnprintf(char *buf, rt_size_t size, const char *fmt, va_list args)
+{
+#ifdef RT_KLIBC_USING_VSNPRINTF_LONGLONG
+    unsigned long long num = 0;
+#else
+    unsigned long num = 0;
+#endif /* RT_KLIBC_USING_VSNPRINTF_LONGLONG */
+    int i = 0, len = 0;
+    char *str = RT_NULL, *end = RT_NULL, c = 0;
+    const char *s = RT_NULL;
+
+    rt_uint8_t base = 0;            /* the base of number */
+    rt_uint8_t flags = 0;           /* flags to print number */
+    rt_uint8_t qualifier = 0;       /* 'h', 'l', or 'L' for integer fields */
+    rt_int32_t field_width = 0;     /* width of output field */
+    int precision = 0;      /* min. # of digits for integers and max for a string */
+
+    str = buf;
+    end = buf + size;
+
+    /* Make sure end is always >= buf */
+    if (end < buf)
+    {
+        end  = ((char *) - 1);
+        size = end - buf;
+    }
+
+    for (; *fmt ; ++fmt)
+    {
+        if (*fmt != '%')
+        {
+            if (str < end)
+            {
+                *str = *fmt;
+            }
+
+            ++ str;
+            continue;
+        }
+
+        /* process flags */
+        flags = 0;
+
+        while (1)
+        {
+            /* skips the first '%' also */
+            ++fmt;
+            if (*fmt == '-') flags |= LEFT;
+            else if (*fmt == '+') flags |= PLUS;
+            else if (*fmt == ' ') flags |= SPACE;
+            else if (*fmt == '#') flags |= SPECIAL;
+            else if (*fmt == '0') flags |= ZEROPAD;
+            else break;
+        }
+
+        /* get field width */
+        field_width = -1;
+        if (_ISDIGIT(*fmt))
+        {
+            field_width = skip_atoi(&fmt);
+        }
+        else if (*fmt == '*')
+        {
+            ++fmt;
+            /* it's the next argument */
+            field_width = va_arg(args, int);
+            if (field_width < 0)
+            {
+                field_width = -field_width;
+                flags |= LEFT;
+            }
+        }
+
+        /* get the precision */
+        precision = -1;
+        if (*fmt == '.')
+        {
+            ++fmt;
+            if (_ISDIGIT(*fmt))
+            {
+                precision = skip_atoi(&fmt);
+            }
+            else if (*fmt == '*')
+            {
+                ++fmt;
+                /* it's the next argument */
+                precision = va_arg(args, int);
+            }
+            if (precision < 0)
+            {
+                precision = 0;
+            }
+        }
+
+        qualifier = 0; /* get the conversion qualifier */
+
+        if (*fmt == 'h' || *fmt == 'l' ||
+#ifdef RT_KLIBC_USING_VSNPRINTF_LONGLONG
+            *fmt == 'L' ||
+#endif /* RT_KLIBC_USING_VSNPRINTF_LONGLONG */
+            *fmt == 'z')
+        {
+            qualifier = *fmt;
+            ++fmt;
+#ifdef RT_KLIBC_USING_VSNPRINTF_LONGLONG
+            if (qualifier == 'l' && *fmt == 'l')
+            {
+                qualifier = 'L';
+                ++fmt;
+            }
+#endif /* RT_KLIBC_USING_VSNPRINTF_LONGLONG */
+            if (qualifier == 'h' && *fmt == 'h')
+            {
+                qualifier = 'H';
+                ++fmt;
+            }
+        }
+
+        /* the default base */
+        base = 10;
+
+        switch (*fmt)
+        {
+        case 'c':
+            if (!(flags & LEFT))
+            {
+                while (--field_width > 0)
+                {
+                    if (str < end) *str = ' ';
+                    ++ str;
+                }
+            }
+
+            /* get character */
+            c = (rt_uint8_t)va_arg(args, int);
+            if (str < end)
+            {
+                *str = c;
+            }
+            ++ str;
+
+            /* put width */
+            while (--field_width > 0)
+            {
+                if (str < end) *str = ' ';
+                ++ str;
+            }
+            continue;
+
+        case 's':
+            s = va_arg(args, char *);
+            if (!s)
+            {
+                s = "(null)";
+            }
+
+            for (len = 0; (len != field_width) && (s[len] != '\0'); len++);
+
+            if (precision > 0 && len > precision)
+            {
+                len = precision;
+            }
+
+            if (!(flags & LEFT))
+            {
+                while (len < field_width--)
+                {
+                    if (str < end) *str = ' ';
+                    ++ str;
+                }
+            }
+
+            for (i = 0; i < len; ++i)
+            {
+                if (str < end) *str = *s;
+                ++ str;
+                ++ s;
+            }
+
+            while (len < field_width--)
+            {
+                if (str < end) *str = ' ';
+                ++ str;
+            }
+            continue;
+
+        case 'p':
+            if (field_width == -1)
+            {
+                field_width = sizeof(void *) << 1;
+                field_width += 2; /* `0x` prefix */
+                flags |= SPECIAL;
+                flags |= ZEROPAD;
+            }
+            str = print_number(str, end, (unsigned long)va_arg(args, void *),
+                               16, qualifier, field_width, precision, flags);
+            continue;
+
+        case '%':
+            if (str < end)
+            {
+                *str = '%';
+            }
+            ++ str;
+            continue;
+
+        /* integer number formats - set up the flags and "break" */
+        case 'b':
+            base = 2;
+            break;
+        case 'o':
+            base = 8;
+            break;
+
+        case 'X':
+            flags |= LARGE;
+        case 'x':
+            base = 16;
+            break;
+
+        case 'd':
+        case 'i':
+            flags |= SIGN;
+        case 'u':
+            break;
+
+        case 'e':
+        case 'E':
+        case 'G':
+        case 'g':
+        case 'f':
+        case 'F':
+            va_arg(args, double);
+        default:
+            if (str < end)
+            {
+                *str = '%';
+            }
+            ++ str;
+
+            if (*fmt)
+            {
+                if (str < end)
+                {
+                    *str = *fmt;
+                }
+                ++ str;
+            }
+            else
+            {
+                -- fmt;
+            }
+            continue;
+        }
+
+        if (qualifier == 'L')
+        {
+            num = va_arg(args, unsigned long long);
+        }
+        else if (qualifier == 'l')
+        {
+            num = va_arg(args, unsigned long);
+        }
+        else if (qualifier == 'H')
+        {
+            num = (rt_int8_t)va_arg(args, rt_int32_t);
+            if (flags & SIGN)
+            {
+                num = (rt_int8_t)num;
+            }
+        }
+        else if (qualifier == 'h')
+        {
+            num = (rt_uint16_t)va_arg(args, rt_int32_t);
+            if (flags & SIGN)
+            {
+                num = (rt_int16_t)num;
+            }
+        }
+        else if (qualifier == 'z')
+        {
+            num = va_arg(args, rt_size_t);
+            if (flags & SIGN)
+            {
+                num = (rt_ssize_t)num;
+            }
+        }
+        else
+        {
+            num = (rt_uint32_t)va_arg(args, unsigned long);
+        }
+        str = print_number(str, end, num, base, qualifier, field_width, precision, flags);
+    }
+
+    if (size > 0)
+    {
+        if (str < end)
+        {
+            *str = '\0';
+        }
+        else
+        {
+            end[-1] = '\0';
+        }
+    }
+
+    /* the trailing null byte doesn't count towards the total
+    * ++str;
+    */
+    return str - buf;
+}
+#if (defined(__GNUC__) && !defined(__ARMCC_VERSION) /* GCC */) && (__GNUC__ >= 7)
+#pragma GCC diagnostic pop /* ignored "-Wimplicit-fallthrough" */
+#endif /* (defined(__GNUC__) && !defined(__ARMCC_VERSION)) && (__GNUC__ >= 7 */

rt-thread/src/klibc/rt_vsscanf.c

@@ -0,0 +1,700 @@
+/*
+ * Copyright (c) 2006-2025, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author              Notes
+ * 2024-11-24     Meco Man            port to klibc
+ * 2025-01-04     Meco Man            using Phoenix version
+ */
+
+/*
+ * Copyright 2017, 2022-2023 Phoenix Systems
+ * Author: Adrian Kepka, Gerard Swiderski
+ */
+
+#include <rtthread.h>
+#include <stdlib.h> /* for strtod */
+#include <ctype.h> /* for isspace */
+#include <stdarg.h> /* for va_list */
+
+#define FORMAT_NIL_STR     "(nil)"
+#define FORMAT_NIL_STR_LEN (sizeof(FORMAT_NIL_STR) - 1)
+
+#define LONG       0x01   /* l: long or double */
+#define LONGDOUBLE 0x02   /* L: long double */
+#define SHORT      0x04   /* h: short */
+#define SUPPRESS   0x08   /* *: suppress assignment */
+#define POINTER    0x10   /* p: void * (as hex) */
+#define NOSKIP     0x20   /* [ or c: do not skip blanks */
+#define LONGLONG   0x400  /* ll: long long (+ deprecated q: quad) */
+#define PTRDIFF    0x800  /* t: ptrdiff_t */
+#define SHORTSHORT 0x4000 /* hh: char */
+#define UNSIGNED   0x8000 /* %[oupxX] conversions */
+
+#define SIGNOK     0x40  /* +/- is (still) legal */
+#define NDIGITS    0x80  /* no digits detected */
+#define PFXOK      0x100 /* 0x prefix is (still) legal */
+#define NZDIGITS   0x200 /* no zero digits detected */
+
+#define CT_CHAR    0 /* %c conversion */
+#define CT_CCL     1 /* %[...] conversion */
+#define CT_STRING  2 /* %s conversion */
+#define CT_INT     3 /* %[dioupxX] conversion */
+#define CT_FLOAT   4 /* %[aefgAEFG] conversion */
+#define CT_NONE    5 /* No conversion (ex. %n) */
+
+static const unsigned char *__sccl(char *tab, const unsigned char *fmt)
+{
+    int c, n, v;
+
+    c = *fmt++;
+    if (c == '^') {
+        v = 1;
+        c = *fmt++;
+    }
+    else {
+        v = 0;
+    }
+
+    rt_memset(tab, (uint8_t)v, 256);
+
+    if (c == 0) {
+        return (fmt - 1);
+    }
+
+    v = 1 - v;
+    tab[c] = v;
+    for (;;) {
+        n = *fmt++;
+        switch (n) {
+
+            case 0:
+                return (fmt - 1);
+
+            case '-':
+                n = *fmt;
+                if ((n == ']') || (n < c)) {
+                    c = '-';
+                    tab[c] = v;
+                    break;
+                }
+                fmt++;
+
+                do {
+                    tab[++c] = v;
+                } while (c < n);
+                c = n;
+                break;
+
+            case ']':
+                return (fmt);
+
+            default:
+                c = n;
+                tab[c] = v;
+                break;
+        }
+    }
+}
+
+static int scanf_parse(char *ccltab, const char *inp, int *inr, char const *fmt0, va_list ap)
+{
+    const unsigned char *fmt = (const unsigned char *)fmt0;
+    int c, n, flags, nassigned, nconversions, nread, base;
+    rt_size_t width;
+    char *p, *p0;
+    char buf[32];
+
+    static const short basefix[17] = { 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
+
+    *inr = rt_strlen(inp);
+
+    nassigned = 0;
+    nconversions = 0;
+    nread = 0;
+    base = 0;
+    for (;;) {
+        int convType = CT_NONE;
+        c = *fmt++;
+        if (c == '\0') {
+            return (nassigned);
+        }
+
+        if (isspace(c) != 0) {
+            while ((*inr > 0) && (isspace((int)*inp) != 0)) {
+                nread++;
+                (*inr)--;
+                inp++;
+            }
+            continue;
+        }
+
+        if (c != '%') {
+            if (*inr <= 0) {
+                return (nconversions != 0 ? nassigned : -1);
+            }
+
+            if (*inp != c) {
+                return nassigned;
+            }
+
+            nread++;
+            (*inr)--;
+            inp++;
+            continue;
+        }
+
+        width = 0;
+        flags = 0;
+        for (;;) {
+            c = *fmt++;
+            if (c == '\0') {
+                return nassigned;
+            }
+
+            if (c == '%') {
+                if (*inr <= 0) {
+                    return (nconversions != 0 ? nassigned : -1);
+                }
+
+                if (*inp != c) {
+                    return nassigned;
+                }
+
+                nread++;
+                (*inr)--;
+                inp++;
+                break;
+            }
+
+            switch (c) {
+                case '*':
+                    flags |= SUPPRESS;
+                    continue;
+
+                case 'l':
+                    if ((flags & LONG) != 0) {
+                        flags &= ~LONG;
+                        flags |= LONGLONG;
+                    }
+                    else {
+                        flags |= LONG;
+                    }
+                    continue;
+
+                case 'L':
+                    flags |= LONGDOUBLE;
+                    continue;
+
+                case 'q':
+                case 'j':
+                    flags |= LONGLONG;
+                    continue;
+
+                case 't':
+                    flags |= PTRDIFF;
+                    continue;
+
+                case 'z':
+                    if (sizeof(rt_size_t) == sizeof(uint64_t)) {
+                        flags |= LONGLONG;
+                    }
+                    continue;
+
+                case 'h':
+                    if ((flags & SHORT) != 0) {
+                        flags &= ~SHORT;
+                        flags |= SHORTSHORT;
+                    }
+                    else {
+                        flags |= SHORT;
+                    }
+                    continue;
+
+                case '0':
+                case '1':
+                case '2':
+                case '3':
+                case '4':
+                case '5':
+                case '6':
+                case '7':
+                case '8':
+                case '9':
+                    width = width * 10 + c - '0';
+                    continue;
+                default:
+                    break;
+            }
+
+            /* conversions */
+            switch (c) {
+                case 'd':
+                    convType = CT_INT;
+                    base = 10;
+                    break;
+
+                case 'i':
+                    convType = CT_INT;
+                    base = 0;
+                    break;
+
+                case 'o':
+                    convType = CT_INT;
+                    flags |= UNSIGNED;
+                    base = 8;
+                    break;
+
+                case 'u':
+                    convType = CT_INT;
+                    flags |= UNSIGNED;
+                    base = 10;
+                    break;
+
+                case 'X':
+                case 'x':
+                    flags |= PFXOK; /* enable 0x prefixing */
+                    convType = CT_INT;
+                    flags |= UNSIGNED;
+                    base = 16;
+                    break;
+
+                case 'A':
+                case 'E':
+                case 'F':
+                case 'G':
+                case 'a':
+                case 'e':
+                case 'f':
+                case 'g':
+                    convType = CT_FLOAT;
+                    break;
+
+
+                case 's':
+                    convType = CT_STRING;
+                    break;
+
+                case '[':
+                    fmt = __sccl(ccltab, fmt);
+                    flags |= NOSKIP;
+                    convType = CT_CCL;
+                    break;
+
+                case 'c':
+                    flags |= NOSKIP;
+                    convType = CT_CHAR;
+                    break;
+
+                case 'p':
+                    flags |= POINTER | PFXOK | UNSIGNED;
+                    convType = CT_INT;
+                    base = 16;
+                    break;
+
+                case 'n':
+                    nconversions++;
+                    if ((flags & SUPPRESS) != 0) {
+                        break;
+                    }
+                    if ((flags & SHORTSHORT) != 0) {
+                        *va_arg(ap, char *) = nread;
+                    }
+                    else if ((flags & SHORT) != 0) {
+                        *va_arg(ap, short *) = nread;
+                    }
+                    else if ((flags & LONG) != 0) {
+                        *va_arg(ap, long *) = nread;
+                    }
+                    else if ((flags & LONGLONG) != 0) {
+                        *va_arg(ap, long long *) = nread;
+                    }
+                    else if ((flags & PTRDIFF) != 0) {
+                        *va_arg(ap, ptrdiff_t *) = nread;
+                    }
+                    else {
+                        *va_arg(ap, int *) = nread;
+                    }
+                    break;
+
+                default:
+                    /* Character not a conversion specifier; end parsing */
+                    return nassigned;
+            }
+
+            break;
+        }
+
+        if (convType == CT_NONE) {
+            continue;
+        }
+
+        if (*inr <= 0) {
+            return (nconversions != 0 ? nassigned : -1);
+        }
+
+        if ((flags & NOSKIP) == 0) {
+            while (isspace((int)*inp) != 0) {
+                nread++;
+                if (--(*inr) > 0) {
+                    inp++;
+                }
+                else {
+                    return (nconversions != 0 ? nassigned : -1);
+                }
+            }
+        }
+
+        /* do the conversion */
+        switch (convType) {
+            case CT_CHAR:
+                if (width == 0) {
+                    width = 1;
+                }
+
+                if (*inr <= 0) {
+                    return (nconversions != 0 ? nassigned : -1);
+                }
+
+                if (width > *inr) {
+                    width = *inr;
+                }
+
+                if ((flags & SUPPRESS) == 0) {
+                    rt_memcpy(va_arg(ap, char *), inp, width);
+                    nassigned++;
+                }
+
+                *inr -= width;
+                inp += width;
+                nread += width;
+                nconversions++;
+                break;
+
+            case CT_CCL:
+                if (width == 0) {
+                    width = (rt_size_t)~0;
+                }
+                if ((flags & SUPPRESS) != 0) {
+                    n = 0;
+                    while (ccltab[(unsigned char)*inp] != 0) {
+                        n++;
+                        (*inr)--;
+                        inp++;
+                        if (--width == 0) {
+                            break;
+                        }
+                        if (*inr <= 0) {
+                            if (n == 0) {
+                                return (nconversions != 0 ? nassigned : -1);
+                            }
+                            break;
+                        }
+                    }
+                    if (n == 0) {
+                        return nassigned;
+                    }
+                }
+                else {
+                    p0 = p = va_arg(ap, char *);
+                    while (ccltab[(unsigned char)*inp] != 0) {
+                        (*inr)--;
+                        *p++ = *inp++;
+                        if (--width == 0) {
+                            break;
+                        }
+                        if (*inr <= 0) {
+                            if (p == p0) {
+                                return (nconversions != 0 ? nassigned : -1);
+                            }
+                            break;
+                        }
+                    }
+                    n = p - p0;
+                    if (n == 0) {
+                        return nassigned;
+                    }
+                    *p = 0;
+                    nassigned++;
+                }
+                nread += n;
+                nconversions++;
+                break;
+
+            case CT_STRING:
+                if (width == 0) {
+                    width = (rt_size_t)~0;
+                }
+                if ((flags & SUPPRESS) != 0) {
+                    while (isspace((int)*inp) == 0) {
+                        nread++;
+                        (*inr)--;
+                        inp++;
+                        if (--width == 0) {
+                            break;
+                        }
+                        if (*inr <= 0) {
+                            break;
+                        }
+                    }
+                }
+                else {
+                    p0 = p = va_arg(ap, char *);
+                    while (isspace((int)*inp) == 0) {
+                        (*inr)--;
+                        *p++ = *inp++;
+                        if (--width == 0) {
+                            break;
+                        }
+                        if (*inr <= 0) {
+                            break;
+                        }
+                    }
+                    *p = 0;
+                    nread += p - p0;
+                    nassigned++;
+                }
+                nconversions++;
+                continue;
+
+            case CT_INT:
+                if (((flags & POINTER) != 0) && ((*inr) >= FORMAT_NIL_STR_LEN) && (rt_strncmp(FORMAT_NIL_STR, inp, FORMAT_NIL_STR_LEN) == 0)) {
+                    *va_arg(ap, void **) = RT_NULL;
+                    nassigned++;
+                    nconversions++;
+                    nread += FORMAT_NIL_STR_LEN;
+                    inp += FORMAT_NIL_STR_LEN;
+                    (*inr) -= FORMAT_NIL_STR_LEN;
+                    break;
+                }
+
+                if (--width > (sizeof(buf) - 2)) {
+                    width = sizeof(buf) - 2;
+                }
+                width++;
+
+                if ((flags & SUPPRESS) != 0) {
+                    width = ~0;
+                }
+
+                flags |= SIGNOK | NDIGITS | NZDIGITS;
+                for (p = buf; width; width--) {
+                    int ok = 0;
+                    c = *inp;
+                    switch (c) {
+                        case '0':
+                            if (base == 0) {
+                                base = 8;
+                                flags |= PFXOK;
+                            }
+                            if ((flags & NZDIGITS) != 0) {
+                                flags &= ~(SIGNOK | NZDIGITS | NDIGITS);
+                            }
+                            else {
+                                flags &= ~(SIGNOK | PFXOK | NDIGITS);
+                            }
+                            ok = 1;
+                            break;
+
+                        case '1':
+                        case '2':
+                        case '3':
+                        case '4':
+                        case '5':
+                        case '6':
+                        case '7':
+                            base = basefix[base];
+                            flags &= ~(SIGNOK | PFXOK | NDIGITS);
+                            ok = 1;
+                            break;
+
+                        case '8':
+                        case '9':
+                            base = basefix[base];
+                            if (base <= 8) {
+                                break; /* not legal here */
+                            }
+                            flags &= ~(SIGNOK | PFXOK | NDIGITS);
+                            ok = 1;
+                            break;
+
+                        case 'A':
+                        case 'B':
+                        case 'C':
+                        case 'D':
+                        case 'E':
+                        case 'F':
+                        case 'a':
+                        case 'b':
+                        case 'c':
+                        case 'd':
+                        case 'e':
+                        case 'f':
+                            if (base <= 10) {
+                                break;
+                            }
+                            flags &= ~(SIGNOK | PFXOK | NDIGITS);
+                            ok = 1;
+                            break;
+
+                        case '+':
+                        case '-':
+                            if ((flags & SIGNOK) != 0) {
+                                flags &= ~SIGNOK;
+                                ok = 1;
+                            }
+                            break;
+
+                        case 'x':
+                        case 'X':
+                            if (((flags & PFXOK) != 0) && (p == buf + 1)) {
+                                base = 16; /* if %i */
+                                flags &= ~PFXOK;
+                                ok = 1;
+                            }
+                            break;
+                    }
+                    if (!ok)
+                        break;
+
+                    if ((flags & SUPPRESS) == 0) {
+                        *p++ = c;
+                    }
+                    if (--(*inr) > 0) {
+                        inp++;
+                    }
+                    else {
+                        break;
+                    }
+                }
+                if ((flags & NDIGITS) != 0) {
+                    return (nconversions != 0 ? nassigned : -1);
+                }
+
+                c = ((unsigned char *)p)[-1];
+                if ((c == 'x') || (c == 'X')) {
+                    --p;
+                    inp--;
+                    (*inr)++;
+                }
+
+                if ((flags & SUPPRESS) == 0) {
+                    uint64_t res;
+
+                    *p = 0;
+                    if ((flags & UNSIGNED) == 0) {
+                        res = strtoll(buf, (char **)RT_NULL, base);
+                    }
+                    else {
+                        res = strtoull(buf, (char **)RT_NULL, base);
+                    }
+                    if ((flags & POINTER) != 0) {
+                        *va_arg(ap, void **) = (void *)(unsigned long)res;
+                    }
+                    else if ((flags & SHORTSHORT) != 0) {
+                        *va_arg(ap, char *) = res;
+                    }
+                    else if ((flags & SHORT) != 0) {
+                        *va_arg(ap, short *) = res;
+                    }
+                    else if ((flags & LONG) != 0) {
+                        *va_arg(ap, long *) = res;
+                    }
+                    else if ((flags & LONGLONG) != 0) {
+                        *va_arg(ap, long long *) = res;
+                    }
+                    else if ((flags & PTRDIFF) != 0) {
+                        *va_arg(ap, ptrdiff_t *) = res;
+                    }
+                    else {
+                        *va_arg(ap, int *) = res;
+                    }
+                    nassigned++;
+                }
+
+                nread += p - buf;
+                nconversions++;
+                break;
+
+            case CT_FLOAT: {
+                union {
+                    float f;
+                    double d;
+                    long double ld;
+                } res;
+
+                const char *srcbuf = inp;
+                if ((width != 0) && (width < *inr)) {
+                    /* TODO: handle larger widths */
+                    if (width > (sizeof(buf) - 1)) {
+                        return (nconversions != 0 ? nassigned : -1);
+                    }
+
+                    rt_memcpy(buf, inp, width);
+                    buf[width] = '\0';
+                    srcbuf = buf;
+                }
+
+                int is_zero;
+                if ((flags & LONGDOUBLE) != 0) {
+                    res.ld = strtold(srcbuf, &p);
+                    is_zero = res.ld == 0;
+                }
+                else if ((flags & LONG) != 0) {
+                    res.d = strtod(srcbuf, &p);
+                    is_zero = res.d == 0;
+                }
+                else {
+                    res.f = strtof(srcbuf, &p);
+                    is_zero = res.f == 0;
+                }
+
+                if (is_zero && (srcbuf == p)) {
+                    return (nconversions != 0 ? nassigned : -1);
+                }
+
+                int consumed = p - srcbuf;
+                *inr -= consumed;
+                inp += consumed;
+                nread += consumed;
+                nconversions++;
+                if ((flags & SUPPRESS) == 0) {
+                    if ((flags & LONGDOUBLE) != 0) {
+                        *va_arg(ap, long double *) = res.ld;
+                    }
+                    else if ((flags & LONG) != 0) {
+                        *va_arg(ap, double *) = res.d;
+                    }
+                    else {
+                        *va_arg(ap, float *) = res.f;
+                    }
+
+                    nassigned++;
+                }
+
+                break;
+            }
+
+            default:
+                break;
+        }
+    }
+    /* never reached */
+}
+
+int rt_vsscanf(const char *str, const char *format, va_list ap)
+{
+    int ret, nremain;
+    char *ccltab = rt_malloc(256);
+
+    if (ccltab == RT_NULL) {
+        return -1;
+    }
+
+    ret = scanf_parse(ccltab, str, &nremain, format, ap);
+    rt_free(ccltab);
+
+    return ret;
+}

rt-thread/src/klibc/utest/SConscript

@@ -0,0 +1,10 @@
+from building import *
+
+src = []
+
+if GetDepend('RT_UTEST_USING_ALL_CASES') or GetDepend('RT_UTEST_TC_USING_KLIBC'):
+    src += Glob('TC_*.c')
+
+group = DefineGroup('utestcases', src, depend = [''])
+
+Return('group')

rt-thread/src/klibc/utest/TC_rt_memcmp.c

@@ -0,0 +1,161 @@
+/*
+ * Copyright (c) 2006-2024, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author             Notes
+ * 2020-05-06     Phillip Johnston   the first version
+ * 2024-12-24     Meco Man           port to utest
+ */
+
+#include <rtklibc.h>
+#include <utest.h>
+
+static void TC_rt_memcmp_str(void)
+{
+    const char* s = "abc 123";
+
+    uassert_int_equal(rt_memcmp("abc", "abc", 4), 0);
+    uassert_int_equal(rt_memcmp(s, "abc", 3), 0);
+    uassert_int_equal(rt_memcmp("abc", s, 3), 0);
+
+    /* The following tests intentionally use a length > 3 */
+    /* To test what rt_memcmp does in such a situation */
+    uassert_value_greater(rt_memcmp(s, "abc", 6), 0);
+    uassert_value_less(rt_memcmp("abc", s, 6), 0);
+}
+
+static void TC_rt_memcmp_int_array(void)
+{
+    int arr1[] = {1, 2, 3, 4, 5};
+    int arr2[] = {1, 2, 3, 4, 5};
+    int arr3[] = {1, 2, 3, 4, 6};
+
+    uassert_int_equal(rt_memcmp(arr1, arr2, sizeof(arr1)), 0);
+    uassert_value_less(rt_memcmp(arr1, arr3, sizeof(arr1)), 0);
+    uassert_value_greater(rt_memcmp(arr3, arr1, sizeof(arr1)), 0);
+}
+
+static void TC_rt_memcmp_float_array(void)
+{
+    float arr1[] = {1.0f, 2.0f, 3.0f};
+    float arr2[] = {1.0f, 2.0f, 3.0f};
+    float arr3[] = {1.0f, 2.0f, 3.1f};
+
+    uassert_int_equal(rt_memcmp(arr1, arr2, sizeof(arr1)), 0);
+    uassert_value_less(rt_memcmp(arr1, arr3, sizeof(arr1)), 0);
+    uassert_value_greater(rt_memcmp(arr3, arr1, sizeof(arr1)), 0);
+}
+
+typedef struct {
+    int id;
+    float value;
+} Item;
+
+static void TC_rt_memcmp_struct_array(void)
+{
+    Item arr1[] = {{1, 1.0f}, {2, 2.0f}};
+    Item arr2[] = {{1, 1.0f}, {2, 2.0f}};
+    Item arr3[] = {{1, 1.0f}, {2, 2.1f}};
+
+    uassert_int_equal(rt_memcmp(arr1, arr2, sizeof(arr1)), 0);
+    uassert_value_less(rt_memcmp(arr1, arr3, sizeof(arr1)), 0);
+    uassert_value_greater(rt_memcmp(arr3, arr1, sizeof(arr1)), 0);
+}
+
+typedef struct {
+    int id;
+    float value;
+    char name[10];
+} MixedItem;
+
+static void TC_rt_memcmp_mixed_array(void)
+{
+    MixedItem arr1[] = {{1, 1.0f, "item1"}, {2, 2.0f, "item2"}};
+    MixedItem arr2[] = {{1, 1.0f, "item1"}, {2, 2.0f, "item2"}};
+    MixedItem arr3[] = {{1, 1.0f, "item1"}, {2, 2.1f, "item2"}};
+
+    uassert_int_equal(rt_memcmp(arr1, arr2, sizeof(arr1)), 0);
+    uassert_value_less(rt_memcmp(arr1, arr3, sizeof(arr1)), 0);
+    uassert_value_greater(rt_memcmp(arr3, arr1, sizeof(arr1)), 0);
+}
+
+typedef struct {
+    int id;
+    float score;
+} Student;
+
+typedef struct {
+    Student students[3];
+    char className[10];
+} Class;
+
+static void TC_rt_memcmp_nested_struct_array(void)
+{
+    Class class1 = {
+        .students = {{1, 90.5}, {2, 85.0}, {3, 92.0}},
+        .className = "ClassA"
+    };
+
+    Class class2 = {
+        .students = {{1, 90.5}, {2, 85.0}, {3, 92.0}},
+        .className = "ClassA"
+    };
+
+    Class class3 = {
+        .students = {{1, 90.5}, {2, 85.1}, {3, 92.0}},
+        .className = "ClassA"
+    };
+
+    uassert_int_equal(rt_memcmp(&class1, &class2, sizeof(Class)), 0);
+    uassert_int_not_equal(rt_memcmp(&class1, &class3, sizeof(Class)), 0);
+}
+
+static void TC_rt_memcmp_partial_match(void)
+{
+    char arr1[] = "abcdefghijklmnopqrstuvwxyz";
+    char arr2[] = "abcdefghijklmxyznopqrstuvw";
+
+    uassert_int_equal(rt_memcmp(arr1, arr2, 13), 0);
+    uassert_int_not_equal(rt_memcmp(arr1, arr2, sizeof(arr1)), 0);
+}
+
+#define LARGE_ARRAY_SIZE 500
+
+static void TC_rt_memcmp_large_array(void)
+{
+    int *arr1 = rt_calloc(LARGE_ARRAY_SIZE, sizeof(int));
+    int *arr2 = rt_calloc(LARGE_ARRAY_SIZE, sizeof(int));
+
+    uassert_not_null(arr1);
+    uassert_not_null(arr2);
+
+    for (int i = 0; i < LARGE_ARRAY_SIZE; i++) {
+        arr1[i] = i;
+        arr2[i] = i;
+    }
+
+    uassert_int_equal(rt_memcmp(arr1, arr2, LARGE_ARRAY_SIZE * sizeof(int)), 0);
+    arr2[LARGE_ARRAY_SIZE - 1] = LARGE_ARRAY_SIZE;
+
+    uassert_value_less(rt_memcmp(arr1, arr2, LARGE_ARRAY_SIZE * sizeof(int)), 0);
+    uassert_value_greater(rt_memcmp(arr2, arr1, LARGE_ARRAY_SIZE * sizeof(int)), 0);
+
+    rt_free(arr1);
+    rt_free(arr2);
+}
+
+static void utest_do_tc(void)
+{
+    UTEST_UNIT_RUN(TC_rt_memcmp_str);
+    UTEST_UNIT_RUN(TC_rt_memcmp_int_array);
+    UTEST_UNIT_RUN(TC_rt_memcmp_float_array);
+    UTEST_UNIT_RUN(TC_rt_memcmp_struct_array);
+    UTEST_UNIT_RUN(TC_rt_memcmp_mixed_array);
+    UTEST_UNIT_RUN(TC_rt_memcmp_nested_struct_array);
+    UTEST_UNIT_RUN(TC_rt_memcmp_partial_match);
+    UTEST_UNIT_RUN(TC_rt_memcmp_large_array);
+}
+
+UTEST_TC_EXPORT(utest_do_tc, "klibc.rt_memcmp", RT_NULL, RT_NULL, 1000);

rt-thread/src/klibc/utest/TC_rt_memcpy.c

@@ -0,0 +1,108 @@
+/*
+ * Copyright (c) 2006-2024, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author             Notes
+ * 2020-05-06     Phillip Johnston   the first version
+ * 2024-12-24     Meco Man           port to utest
+ */
+
+#include <rtthread.h>
+#include <utest.h>
+
+#define N 80 /**< Define the constant N for buffer size as 80 */
+#define TEST_BUF_SIZE 512 /**< Define the constant TEST_BUF_SIZE as 512 */
+static char *buf; /**< Define a static buffer of 512 bytes, initialized to 0 */
+
+static rt_err_t utest_tc_init(void)
+{
+    buf = rt_malloc(TEST_BUF_SIZE * sizeof(char)); /**< Allocate memory for the buffer */
+    uassert_not_null(buf);
+    return RT_EOK;
+}
+
+static rt_err_t utest_tc_cleanup(void)
+{
+    rt_free(buf);
+    return RT_EOK;
+}
+
+/**
+ * Test memory copy with alignment.
+ * @param dalign The alignment offset for the destination buffer.
+ * @param salign The alignment offset for the source buffer.
+ * @param len The length of data to copy.
+ */
+static void test_align(unsigned dalign, unsigned salign, size_t len)
+{
+    char *src = (char *)RT_ALIGN((rt_ubase_t)buf, 64); /**< Source buffer starting address, 64-byte aligned */
+    char *dst = (char *)RT_ALIGN(((rt_ubase_t)buf + 128), 64); /**< Destination buffer starting address, 64-byte aligned from buf+128 */
+    char *want = (char *)RT_ALIGN(((rt_ubase_t)buf + 256), 64); /**< Expected result buffer starting address, 64-byte aligned from buf+256 */
+    char *p; /**< Pointer to receive the return value of rt_memcpy */
+    unsigned i;
+
+    /** Assert that the source alignment offset plus length does not exceed N */
+    uassert_false(salign + len > N);
+    /** Assert that the destination alignment offset plus length does not exceed N */
+    uassert_false(dalign + len > N);
+
+    /** Initialize all buffers with '#' or ' ' */
+    for(i = 0; i < N; i++)
+    {
+        src[i] = '#';
+        dst[i] = want[i] = ' ';
+    }
+
+    /** Set data in the specified alignment offsets of the source and expected result buffers */
+    for(i = 0; i < len; i++)
+    {
+        src[salign + i] = want[dalign + i] = (char)('0' + i);
+    }
+
+    /** Call rt_memcpy to copy data */
+    p = rt_memcpy(dst + dalign, src + salign, len);
+
+    /** Assert that the return value of rt_memcpy is the pointer to the start of the copied data in the destination buffer */
+    uassert_ptr_equal(p, dst + dalign);
+
+    /** Assert that the content of the destination buffer matches the expected result buffer */
+    for(i = 0; i < N; i++)
+    {
+        uassert_int_equal(dst[i], want[i]);
+    }
+}
+
+/**
+ * Test case to iterate over all possible alignment offsets and length combinations.
+ */
+static void TC_rt_memcpy_align(void)
+{
+    for(unsigned i = 0; i < 16; i++) /**< Iterate over source alignment offsets from 0 to 15 */
+    {
+        for(unsigned j = 0; j < 16; j++) /**< Iterate over destination alignment offsets from 0 to 15 */
+        {
+            for(size_t k = 0; k < 64; k++) /**< Iterate over data lengths from 0 to 63 */
+            {
+                test_align(i, j, k); /**< Call the test_align function */
+            }
+        }
+    }
+}
+
+static void TC_rt_memcpy_str(void)
+{
+    const char src[] = "Hello, memcpy!";
+    char dest[20] = {0};
+    rt_memcpy(dest, src, sizeof(src));
+    uassert_true(rt_strcmp(src, dest) == 0);
+}
+
+static void utest_do_tc(void)
+{
+    UTEST_UNIT_RUN(TC_rt_memcpy_str);
+    UTEST_UNIT_RUN(TC_rt_memcpy_align);
+}
+
+UTEST_TC_EXPORT(utest_do_tc, "klibc.rt_memcpy", utest_tc_init, utest_tc_cleanup, 1000);

rt-thread/src/klibc/utest/TC_rt_memmove.c

@@ -0,0 +1,108 @@
+/*
+ * Copyright (c) 2006-2024, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2024-12-25     Meco Man     first version
+ */
+
+#include <rtthread.h>
+#include <utest.h>
+
+/* Basic move with no overlap */
+static void TC_rt_memmove_basic(void)
+{
+    char src[] = "Hello";
+    char dest[10] = {0};
+    rt_memmove(dest, src, rt_strlen(src) + 1);
+    uassert_str_equal(dest, "Hello");
+}
+
+/* Move with overlap (src before dest) */
+static void TC_rt_memmove_overlap_src_before(void)
+{
+    char buffer[] = "1234567890";
+    rt_memmove(&buffer[3], buffer, 5);
+    uassert_str_equal(buffer, "1231234590");
+}
+
+/* Move with overlap (src after dest) */
+static void TC_rt_memmove_overlap_src_after(void)
+{
+    char buffer[] = "1234567890";
+    rt_memmove(&buffer[2], &buffer[5], 5);
+    uassert_str_equal(buffer, "1267890890");
+}
+
+/* Move with zero length */
+static void TC_rt_memmove_zero_length(void)
+{
+    char src[] = "Hello";
+    char dest[10] = "World";
+    rt_memmove(dest, src, 0);
+    uassert_str_equal(dest, "World");
+}
+
+/* Move to the same location */
+static void TC_rt_memmove_same_location(void)
+{
+    char buffer[] = "Hello";
+    rt_memmove(buffer, buffer, rt_strlen(buffer) + 1);
+    uassert_str_equal(buffer, "Hello");
+}
+
+/* Move from NULL */
+static void TC_rt_memmove_null_src(void)
+{
+    char dest[10];
+    rt_memset(dest, 'A', sizeof(dest));
+    rt_memmove(dest, RT_NULL, 0); /* Should not crash and do nothing */
+    uassert_buf_equal(dest, "AAAAAAAAAA", 10);
+}
+
+/* Move to NULL */
+static void TC_rt_memmove_null_dest(void)
+{
+    char src[] = "Hello";
+    rt_memmove(RT_NULL, src, 0); /* Should not crash and do nothing */
+}
+
+/* Move more than source size */
+static void TC_rt_memmove_too_long(void)
+{
+    char src[] = "Short";
+    char dest[10] = {0};
+    rt_memmove(dest, src, sizeof(src) + 5); /* Should only copy up to src length */
+    uassert_str_equal(dest, "Short");
+    uassert_int_equal(dest[5], 0); /* Ensure no buffer overflow */
+}
+
+/* Move empty string */
+static void TC_rt_memmove_empty_string(void)
+{
+    char src[] = "";
+    char dest[10] = "Unchanged";
+    rt_memmove(dest, src, rt_strlen(src) + 1);
+
+    /* Expect dest to only contain '\0' at the start */
+    uassert_str_equal(dest, "");  /* Destination should now be an empty string */
+    uassert_int_equal(dest[0], '\0'); /* First character should be '\0' */
+}
+
+/* Utest function to run all test cases */
+static void utest_do_tc(void)
+{
+    UTEST_UNIT_RUN(TC_rt_memmove_basic);
+    UTEST_UNIT_RUN(TC_rt_memmove_overlap_src_before);
+    UTEST_UNIT_RUN(TC_rt_memmove_overlap_src_after);
+    UTEST_UNIT_RUN(TC_rt_memmove_zero_length);
+    UTEST_UNIT_RUN(TC_rt_memmove_same_location);
+    UTEST_UNIT_RUN(TC_rt_memmove_null_src);
+    UTEST_UNIT_RUN(TC_rt_memmove_null_dest);
+    UTEST_UNIT_RUN(TC_rt_memmove_too_long);
+    UTEST_UNIT_RUN(TC_rt_memmove_empty_string);
+}
+
+UTEST_TC_EXPORT(utest_do_tc, "klibc.rt_memmove", RT_NULL, RT_NULL, 1000);

rt-thread/src/klibc/utest/TC_rt_memset.c

@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2006-2024, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author             Notes
+ * 2020-05-06     Phillip Johnston   the first version
+ * 2024-12-24     Meco Man           port to utest
+ */
+
+#include <rtthread.h>
+#include <utest.h>
+
+#define TEST_BUF_SIZE 400
+
+static char *buf;
+static char *buf2;
+
+static rt_err_t utest_tc_init(void)
+{
+    buf = rt_malloc(TEST_BUF_SIZE * sizeof(char));
+    uassert_not_null(buf);
+    buf2 = rt_malloc(TEST_BUF_SIZE * sizeof(char));
+    uassert_not_null(buf2);
+    return RT_EOK;
+}
+
+static rt_err_t utest_tc_cleanup(void)
+{
+    rt_free(buf);
+    rt_free(buf2);
+    return RT_EOK;
+}
+
+static void test_align(int align, size_t len)
+{
+    char *s = (char *)RT_ALIGN(((rt_ubase_t)buf + 64), 64) + align;
+    char *want = (char *)RT_ALIGN(((rt_ubase_t)buf2 + 64), 64) + align;
+    char *p;
+    int i;
+
+    uassert_false(len + 64 > (size_t)(buf + TEST_BUF_SIZE - s));
+    uassert_false(len + 64 > (size_t)(buf2 + TEST_BUF_SIZE - want));
+
+    for(i = 0; i < TEST_BUF_SIZE; i++)
+    {
+        buf[i] = buf2[i] = ' ';
+    }
+
+    for(i = 0; i < (int)len; i++)
+    {
+        want[i] = '#';
+    }
+
+    p = rt_memset(s, '#', len);
+
+    uassert_ptr_equal(p, s);
+
+    for(i = -64; i < (int)len + 64; i++)
+    {
+        uassert_int_equal(s[i], want[i]);
+    }
+}
+
+static void TC_rt_memcpy_align(void)
+{
+    for(int i = 0; i < 16; i++)
+    {
+        for(size_t j = 0; j < 200; j++)
+        {
+            test_align(i, j);
+        }
+    }
+}
+
+static void test_input(char c)
+{
+    rt_memset(buf, c, 10);
+    for(int i = 0; i < 10; i++)
+    {
+        uassert_int_equal(buf[i], c);
+    }
+}
+
+static void TC_rt_memcpy_input(void)
+{
+    test_input('c');
+    test_input(0);
+    test_input(-1);
+    test_input(0xab);
+    test_input((char)RT_UINT32_MAX);
+    test_input((char)-RT_UINT32_MAX);
+}
+
+static void utest_do_tc(void)
+{
+    UTEST_UNIT_RUN(TC_rt_memcpy_align);
+    UTEST_UNIT_RUN(TC_rt_memcpy_input);
+}
+
+UTEST_TC_EXPORT(utest_do_tc, "klibc.rt_memset", utest_tc_init, utest_tc_cleanup, 1000);

rt-thread/src/klibc/utest/TC_rt_sscanf.c

@@ -0,0 +1,250 @@
+/*
+ * Copyright (c) 2006-2025, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2025-01-04     Meco Man     the first version
+ */
+
+#include <rtklibc.h>
+#include "utest.h"
+
+static void TC_rt_sscanf_char(void)
+{
+    const char str[] = "A B";
+    char a, b;
+    rt_sscanf(str, "%c %c", &a, &b);
+    uassert_true(a == 'A' && b == 'B');
+    /* Move to the next character after space for the second %c */
+    rt_sscanf(str + 2, "%c", &b);
+    uassert_true(b == 'B');
+}
+
+static void TC_rt_sscanf_basic_int(void)
+{
+    const char str[] = "12345";
+    int value;
+    int result = rt_sscanf(str, "%d", &value);
+    uassert_int_equal(result, 1);
+    uassert_int_equal(value, 12345);
+}
+
+static void TC_rt_sscanf_basic_float(void)
+{
+    const char str[] = "123.45";
+    float value;
+    int result = rt_sscanf(str, "%f", &value);
+    uassert_int_equal(result, 1);
+    uassert_float_equal(value, 123.45);
+}
+
+static void TC_rt_sscanf_basic_string(void)
+{
+    const char str[] = "Hello, World!";
+    char buffer[20];
+    int result = rt_sscanf(str, "%s", buffer);
+    uassert_int_equal(result, 1);
+    uassert_str_equal(buffer, "Hello,");
+}
+
+static void TC_rt_sscanf_string_with_space(void)
+{
+    const char str[] = "Hello   World";
+    char a[20];
+    rt_sscanf(str, "%*s %s", a);
+    uassert_str_equal(a, "World");
+}
+
+static void TC_rt_sscanf_basic_char(void)
+{
+    const char str[] = "A";
+    char value;
+    int result = rt_sscanf(str, "%c", &value);
+    uassert_int_equal(result, 1);
+    uassert_int_equal(value, 'A');
+}
+
+static void TC_rt_sscanf_hex_1(void)
+{
+    const char str[] = "0x1A3F";
+    int value;
+    int result = rt_sscanf(str, "%x", &value);
+    uassert_int_equal(result, 1);
+    uassert_int_equal(value, 0x1A3F);
+}
+
+static void TC_rt_sscanf_hex_2(void)
+{
+    const char str[] = "0x1A 0XFF";
+    int a, b;
+    rt_sscanf(str, "%x %x", &a, &b);
+    uassert_true(a == 0x1A && b == 0XFF);
+}
+
+static void TC_rt_sscanf_oct_1(void)
+{
+    const char str[] = "0755";
+    int value;
+    int result = rt_sscanf(str, "%o", &value);
+    uassert_int_equal(result, 1);
+    uassert_int_equal(value, 0755);
+}
+
+static void TC_rt_sscanf_oct_2(void)
+{
+    const char str[] = "012 077";
+    int a, b;
+    rt_sscanf(str, "%o %o", &a, &b);
+    uassert_true(a == 012 && b == 077);
+}
+
+static void TC_rt_sscanf_multiple_args(void)
+{
+    const char str[] = "123 Hello";
+    int int_value;
+    char str_value[20];
+    int result = rt_sscanf(str, "%d %s", &int_value, str_value);
+    uassert_int_equal(result, 2);
+    uassert_int_equal(int_value, 123);
+    uassert_str_equal(str_value, "Hello");
+}
+
+static void TC_rt_sscanf_pointer(void)
+{
+    const char str[] = "0x12345678";
+    void *ptr;
+    int result = rt_sscanf(str, "%p", &ptr);
+    uassert_int_equal(result, 1);
+    uassert_ptr_equal(ptr, (void *)0x12345678);
+}
+
+static void TC_rt_sscanf_width_specifier(void)
+{
+    const char str[] = "123456789";
+    int value;
+    int result = rt_sscanf(str, "%4d", &value);
+    uassert_int_equal(result, 1);
+    uassert_int_equal(value, 1234);
+}
+
+static void TC_rt_sscanf_suppression(void)
+{
+    const char str[] = "123 456";
+    int second_value;
+    int result = rt_sscanf(str, "%*d %d", &second_value);
+    uassert_int_equal(result, 1);
+    uassert_int_equal(second_value, 456);
+}
+
+static void TC_rt_sscanf_match_set(void)
+{
+    const char str[] = "abc123";
+    char buffer[10] = {0};
+    int result = rt_sscanf(str, "%[a-z]", buffer);
+    uassert_int_equal(result, 1);
+    uassert_str_equal(buffer, "abc");
+}
+
+static void TC_rt_sscanf_match_set_negated(void)
+{
+    const char str[] = "abc123";
+    char buffer[10];
+    int result = rt_sscanf(str, "%[^0-9]", buffer);
+    uassert_int_equal(result, 1);
+    uassert_str_equal(buffer, "abc");
+}
+
+static void TC_rt_sscanf_match_set_range(void)
+{
+    const char str[] = "a-zA-Z";
+    char buffer[10];
+    int result = rt_sscanf(str, "%[a-z-A-Z]", buffer);
+    uassert_int_equal(result, 1);
+    uassert_str_equal(buffer, "a-zA-Z");
+}
+
+static void TC_rt_sscanf_whitespace_skip(void)
+{
+    const char str[] = "   12345";
+    int value;
+    int result = rt_sscanf(str, "%d", &value);
+    uassert_int_equal(result, 1);
+    uassert_int_equal(value, 12345);
+}
+
+static void TC_rt_sscanf_unsigned_int(void)
+{
+    const char str[] = "4294967295";
+    unsigned int value;
+    int result = rt_sscanf(str, "%u", &value);
+    uassert_int_equal(result, 1);
+    uassert_int_equal(value, 4294967295U);
+}
+
+static void TC_rt_sscanf_long_long_int(void)
+{
+    const char str[] = "9223372036854775807";
+    long long value;
+    int result = rt_sscanf(str, "%lld", &value);
+    uassert_int_equal(result, 1);
+    uassert_int_equal(value, 9223372036854775807LL);
+}
+
+static void TC_rt_sscanf_short_int(void)
+{
+    const char str[] = "32767";
+    short value;
+    int result = rt_sscanf(str, "%hd", &value);
+    uassert_int_equal(result, 1);
+    uassert_int_equal(value, 32767);
+}
+
+static void TC_rt_sscanf_null_string(void)
+{
+    const char str[] = "";
+    int value;
+    int result = rt_sscanf(str, "%d", &value);
+    uassert_int_equal(result, -1);
+}
+
+/* https://github.com/RT-Thread/rt-thread/issues/9853 */
+static void TC_rt_sscanf_issue_9853(void)
+{
+    int device_socket = 255;
+    int bfsz = 255;
+    const char str[] = "+MIPURC: \"rtcp\",0,240,HTTP/1.1 200 OK";
+    rt_sscanf(str, "+MIPURC:%*[^,],%d,%d", &device_socket, (int *)&bfsz);
+    uassert_int_equal(device_socket, 0);
+    uassert_int_equal(bfsz, 240);
+}
+
+static void utest_do_tc(void)
+{
+    UTEST_UNIT_RUN(TC_rt_sscanf_char);
+    UTEST_UNIT_RUN(TC_rt_sscanf_basic_int);
+    UTEST_UNIT_RUN(TC_rt_sscanf_basic_float);
+    UTEST_UNIT_RUN(TC_rt_sscanf_basic_string);
+    UTEST_UNIT_RUN(TC_rt_sscanf_string_with_space);
+    UTEST_UNIT_RUN(TC_rt_sscanf_basic_char);
+    UTEST_UNIT_RUN(TC_rt_sscanf_hex_1);
+    UTEST_UNIT_RUN(TC_rt_sscanf_hex_2);
+    UTEST_UNIT_RUN(TC_rt_sscanf_oct_1);
+    UTEST_UNIT_RUN(TC_rt_sscanf_oct_2);
+    UTEST_UNIT_RUN(TC_rt_sscanf_multiple_args);
+    UTEST_UNIT_RUN(TC_rt_sscanf_pointer);
+    UTEST_UNIT_RUN(TC_rt_sscanf_width_specifier);
+    UTEST_UNIT_RUN(TC_rt_sscanf_suppression);
+    UTEST_UNIT_RUN(TC_rt_sscanf_match_set);
+    UTEST_UNIT_RUN(TC_rt_sscanf_match_set_negated);
+    UTEST_UNIT_RUN(TC_rt_sscanf_match_set_range);
+    UTEST_UNIT_RUN(TC_rt_sscanf_whitespace_skip);
+    UTEST_UNIT_RUN(TC_rt_sscanf_unsigned_int);
+    UTEST_UNIT_RUN(TC_rt_sscanf_long_long_int);
+    UTEST_UNIT_RUN(TC_rt_sscanf_short_int);
+    UTEST_UNIT_RUN(TC_rt_sscanf_null_string);
+    UTEST_UNIT_RUN(TC_rt_sscanf_issue_9853);
+}
+
+UTEST_TC_EXPORT(utest_do_tc, "klibc.rt_sscanf", RT_NULL, RT_NULL, 1000);

rt-thread/src/mem.c

@@ -0,0 +1,667 @@
+/*
+ * Copyright (c) 2006-2024, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2008-7-12      Bernard      the first version
+ * 2010-06-09     Bernard      fix the end stub of heap
+ *                             fix memory check in rt_realloc function
+ * 2010-07-13     Bernard      fix RT_ALIGN issue found by kuronca
+ * 2010-10-14     Bernard      fix rt_realloc issue when realloc a NULL pointer.
+ * 2017-07-14     armink       fix rt_realloc issue when new size is 0
+ * 2018-10-02     Bernard      Add 64bit support
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *         Simon Goldschmidt
+ *
+ */
+
+#include <rthw.h>
+#include <rtthread.h>
+
+#if defined (RT_USING_SMALL_MEM)
+
+#define DBG_TAG           "kernel.mem"
+#define DBG_LVL           DBG_INFO
+#include <rtdbg.h>
+
+struct rt_small_mem_item
+{
+    rt_uintptr_t            pool_ptr;         /**< small memory object addr */
+    rt_size_t               next;             /**< next free item */
+    rt_size_t               prev;             /**< prev free item */
+#ifdef RT_USING_MEMTRACE
+#ifdef ARCH_CPU_64BIT
+    rt_uint8_t              thread[8];       /**< thread name */
+#else
+    rt_uint8_t              thread[4];       /**< thread name */
+#endif /* ARCH_CPU_64BIT */
+#endif /* RT_USING_MEMTRACE */
+};
+
+/**
+ * Base structure of small memory object
+ */
+struct rt_small_mem
+{
+    struct rt_memory            parent;                 /**< inherit from rt_memory */
+    rt_uint8_t                 *heap_ptr;               /**< pointer to the heap */
+    struct rt_small_mem_item   *heap_end;
+    struct rt_small_mem_item   *lfree;
+    rt_size_t                   mem_size_aligned;       /**< aligned memory size */
+};
+
+#define MIN_SIZE (sizeof(rt_uintptr_t) + sizeof(rt_size_t) + sizeof(rt_size_t))
+
+#define MEM_MASK ((~(rt_size_t)0) - 1)
+
+#define MEM_USED(_mem)       ((((rt_uintptr_t)(_mem)) & MEM_MASK) | 0x1)
+#define MEM_FREED(_mem)      ((((rt_uintptr_t)(_mem)) & MEM_MASK) | 0x0)
+#define MEM_ISUSED(_mem)   \
+                      (((rt_uintptr_t)(((struct rt_small_mem_item *)(_mem))->pool_ptr)) & (~MEM_MASK))
+#define MEM_POOL(_mem)     \
+    ((struct rt_small_mem *)(((rt_uintptr_t)(((struct rt_small_mem_item *)(_mem))->pool_ptr)) & (MEM_MASK)))
+#define MEM_SIZE(_heap, _mem)      \
+    (((struct rt_small_mem_item *)(_mem))->next - ((rt_uintptr_t)(_mem) - \
+    (rt_uintptr_t)((_heap)->heap_ptr)) - RT_ALIGN(sizeof(struct rt_small_mem_item), RT_ALIGN_SIZE))
+
+#define MIN_SIZE_ALIGNED     RT_ALIGN(MIN_SIZE, RT_ALIGN_SIZE)
+#define SIZEOF_STRUCT_MEM    RT_ALIGN(sizeof(struct rt_small_mem_item), RT_ALIGN_SIZE)
+
+#ifdef RT_USING_MEMTRACE
+rt_inline void rt_smem_setname(struct rt_small_mem_item *mem, const char *name)
+{
+    int index;
+    for (index = 0; index < sizeof(mem->thread); index ++)
+    {
+        if (name[index] == '\0') break;
+        mem->thread[index] = name[index];
+    }
+
+    for (; index < sizeof(mem->thread); index ++)
+    {
+        mem->thread[index] = ' ';
+    }
+}
+#endif /* RT_USING_MEMTRACE */
+
+static void plug_holes(struct rt_small_mem *m, struct rt_small_mem_item *mem)
+{
+    struct rt_small_mem_item *nmem;
+    struct rt_small_mem_item *pmem;
+
+    RT_ASSERT((rt_uint8_t *)mem >= m->heap_ptr);
+    RT_ASSERT((rt_uint8_t *)mem < (rt_uint8_t *)m->heap_end);
+
+    /* plug hole forward */
+    nmem = (struct rt_small_mem_item *)&m->heap_ptr[mem->next];
+    if (mem != nmem && !MEM_ISUSED(nmem) &&
+        (rt_uint8_t *)nmem != (rt_uint8_t *)m->heap_end)
+    {
+        /* if mem->next is unused and not end of m->heap_ptr,
+         * combine mem and mem->next
+         */
+        if (m->lfree == nmem)
+        {
+            m->lfree = mem;
+        }
+        nmem->pool_ptr = 0;
+        mem->next = nmem->next;
+        ((struct rt_small_mem_item *)&m->heap_ptr[nmem->next])->prev = (rt_uint8_t *)mem - m->heap_ptr;
+    }
+
+    /* plug hole backward */
+    pmem = (struct rt_small_mem_item *)&m->heap_ptr[mem->prev];
+    if (pmem != mem && !MEM_ISUSED(pmem))
+    {
+        /* if mem->prev is unused, combine mem and mem->prev */
+        if (m->lfree == mem)
+        {
+            m->lfree = pmem;
+        }
+        mem->pool_ptr = 0;
+        pmem->next = mem->next;
+        ((struct rt_small_mem_item *)&m->heap_ptr[mem->next])->prev = (rt_uint8_t *)pmem - m->heap_ptr;
+    }
+}
+
+/**
+ * @brief This function will initialize small memory management algorithm.
+ *
+ * @param name is the name of the small memory management object.
+ *
+ * @param begin_addr the beginning address of memory.
+ *
+ * @param size is the size of the memory.
+ *
+ * @return Return a pointer to the memory object. When the return value is RT_NULL, it means the init failed.
+ */
+rt_smem_t rt_smem_init(const char    *name,
+                     void          *begin_addr,
+                     rt_size_t      size)
+{
+    struct rt_small_mem_item *mem;
+    struct rt_small_mem *small_mem;
+    rt_uintptr_t start_addr, begin_align, end_align, mem_size;
+
+    small_mem = (struct rt_small_mem *)RT_ALIGN((rt_uintptr_t)begin_addr, RT_ALIGN_SIZE);
+    start_addr = (rt_uintptr_t)small_mem + sizeof(*small_mem);
+    begin_align = RT_ALIGN((rt_uintptr_t)start_addr, RT_ALIGN_SIZE);
+    end_align   = RT_ALIGN_DOWN((rt_uintptr_t)begin_addr + size, RT_ALIGN_SIZE);
+
+    /* alignment addr */
+    if ((end_align > (2 * SIZEOF_STRUCT_MEM)) &&
+        ((end_align - 2 * SIZEOF_STRUCT_MEM) >= start_addr))
+    {
+        /* calculate the aligned memory size */
+        mem_size = end_align - begin_align - 2 * SIZEOF_STRUCT_MEM;
+    }
+    else
+    {
+        rt_kprintf("mem init, error begin address 0x%x, and end address 0x%x\n",
+                   (rt_uintptr_t)begin_addr, (rt_uintptr_t)begin_addr + size);
+
+        return RT_NULL;
+    }
+
+    rt_memset(small_mem, 0, sizeof(*small_mem));
+    /* initialize small memory object */
+    rt_object_init(&(small_mem->parent.parent), RT_Object_Class_Memory, name);
+    small_mem->parent.algorithm = "small";
+    small_mem->parent.address = begin_align;
+    small_mem->parent.total = mem_size;
+    small_mem->mem_size_aligned = mem_size;
+
+    /* point to begin address of heap */
+    small_mem->heap_ptr = (rt_uint8_t *)begin_align;
+
+    LOG_D("mem init, heap begin address 0x%x, size %d",
+            (rt_uintptr_t)small_mem->heap_ptr, small_mem->mem_size_aligned);
+
+    /* initialize the start of the heap */
+    mem        = (struct rt_small_mem_item *)small_mem->heap_ptr;
+    mem->pool_ptr = MEM_FREED(small_mem);
+    mem->next  = small_mem->mem_size_aligned + SIZEOF_STRUCT_MEM;
+    mem->prev  = 0;
+#ifdef RT_USING_MEMTRACE
+    rt_smem_setname(mem, "INIT");
+#endif /* RT_USING_MEMTRACE */
+
+    /* initialize the end of the heap */
+    small_mem->heap_end        = (struct rt_small_mem_item *)&small_mem->heap_ptr[mem->next];
+    small_mem->heap_end->pool_ptr = MEM_USED(small_mem);
+    small_mem->heap_end->next  = small_mem->mem_size_aligned + SIZEOF_STRUCT_MEM;
+    small_mem->heap_end->prev  = small_mem->mem_size_aligned + SIZEOF_STRUCT_MEM;
+#ifdef RT_USING_MEMTRACE
+    rt_smem_setname(small_mem->heap_end, "INIT");
+#endif /* RT_USING_MEMTRACE */
+
+    /* initialize the lowest-free pointer to the start of the heap */
+    small_mem->lfree = (struct rt_small_mem_item *)small_mem->heap_ptr;
+
+    return &small_mem->parent;
+}
+RTM_EXPORT(rt_smem_init);
+
+/**
+ * @brief This function will remove a small mem from the system.
+ *
+ * @param m the small memory management object.
+ *
+ * @return RT_EOK
+ */
+rt_err_t rt_smem_detach(rt_smem_t m)
+{
+    RT_ASSERT(m != RT_NULL);
+    RT_ASSERT(rt_object_get_type(&m->parent) == RT_Object_Class_Memory);
+    RT_ASSERT(rt_object_is_systemobject(&m->parent));
+
+    rt_object_detach(&(m->parent));
+
+    return RT_EOK;
+}
+RTM_EXPORT(rt_smem_detach);
+
+/**
+ * @addtogroup group_memory_management
+ */
+
+/**@{*/
+
+/**
+ * @brief Allocate a block of memory with a minimum of 'size' bytes.
+ *
+ * @param m the small memory management object.
+ *
+ * @param size is the minimum size of the requested block in bytes.
+ *
+ * @return the pointer to allocated memory or NULL if no free memory was found.
+ */
+void *rt_smem_alloc(rt_smem_t m, rt_size_t size)
+{
+    rt_size_t ptr, ptr2;
+    struct rt_small_mem_item *mem, *mem2;
+    struct rt_small_mem *small_mem;
+
+    if (size == 0)
+        return RT_NULL;
+
+    RT_ASSERT(m != RT_NULL);
+    RT_ASSERT(rt_object_get_type(&m->parent) == RT_Object_Class_Memory);
+    RT_ASSERT(rt_object_is_systemobject(&m->parent));
+
+    small_mem = (struct rt_small_mem *)m;
+    /* alignment size */
+    size = RT_ALIGN(size, RT_ALIGN_SIZE);
+
+    /* every data block must be at least MIN_SIZE_ALIGNED long */
+    if (size < MIN_SIZE_ALIGNED)
+        size = MIN_SIZE_ALIGNED;
+
+    if (size > small_mem->mem_size_aligned)
+    {
+        LOG_D("no memory");
+
+        return RT_NULL;
+    }
+
+    for (ptr = (rt_uint8_t *)small_mem->lfree - small_mem->heap_ptr;
+         ptr <= small_mem->mem_size_aligned - size;
+         ptr = ((struct rt_small_mem_item *)&small_mem->heap_ptr[ptr])->next)
+    {
+        mem = (struct rt_small_mem_item *)&small_mem->heap_ptr[ptr];
+
+        if ((!MEM_ISUSED(mem)) && (mem->next - (ptr + SIZEOF_STRUCT_MEM)) >= size)
+        {
+            /* mem is not used and at least perfect fit is possible:
+             * mem->next - (ptr + SIZEOF_STRUCT_MEM) gives us the 'user data size' of mem */
+
+            if (mem->next - (ptr + SIZEOF_STRUCT_MEM) >=
+                (size + SIZEOF_STRUCT_MEM + MIN_SIZE_ALIGNED))
+            {
+                /* (in addition to the above, we test if another struct rt_small_mem_item (SIZEOF_STRUCT_MEM) containing
+                 * at least MIN_SIZE_ALIGNED of data also fits in the 'user data space' of 'mem')
+                 * -> split large block, create empty remainder,
+                 * remainder must be large enough to contain MIN_SIZE_ALIGNED data: if
+                 * mem->next - (ptr + (2*SIZEOF_STRUCT_MEM)) == size,
+                 * struct rt_small_mem_item would fit in but no data between mem2 and mem2->next
+                 * @todo we could leave out MIN_SIZE_ALIGNED. We would create an empty
+                 *       region that couldn't hold data, but when mem->next gets freed,
+                 *       the 2 regions would be combined, resulting in more free memory
+                 */
+                ptr2 = ptr + SIZEOF_STRUCT_MEM + size;
+
+                /* create mem2 struct */
+                mem2       = (struct rt_small_mem_item *)&small_mem->heap_ptr[ptr2];
+                mem2->pool_ptr = MEM_FREED(small_mem);
+                mem2->next = mem->next;
+                mem2->prev = ptr;
+#ifdef RT_USING_MEMTRACE
+                rt_smem_setname(mem2, "    ");
+#endif /* RT_USING_MEMTRACE */
+
+                /* and insert it between mem and mem->next */
+                mem->next = ptr2;
+
+                if (mem2->next != small_mem->mem_size_aligned + SIZEOF_STRUCT_MEM)
+                {
+                    ((struct rt_small_mem_item *)&small_mem->heap_ptr[mem2->next])->prev = ptr2;
+                }
+                small_mem->parent.used += (size + SIZEOF_STRUCT_MEM);
+                if (small_mem->parent.max < small_mem->parent.used)
+                    small_mem->parent.max = small_mem->parent.used;
+            }
+            else
+            {
+                /* (a mem2 struct does no fit into the user data space of mem and mem->next will always
+                 * be used at this point: if not we have 2 unused structs in a row, plug_holes should have
+                 * take care of this).
+                 * -> near fit or excact fit: do not split, no mem2 creation
+                 * also can't move mem->next directly behind mem, since mem->next
+                 * will always be used at this point!
+                 */
+                small_mem->parent.used += mem->next - ((rt_uint8_t *)mem - small_mem->heap_ptr);
+                if (small_mem->parent.max < small_mem->parent.used)
+                    small_mem->parent.max = small_mem->parent.used;
+            }
+            /* set small memory object */
+            mem->pool_ptr = MEM_USED(small_mem);
+#ifdef RT_USING_MEMTRACE
+            if (rt_thread_self())
+                rt_smem_setname(mem, rt_thread_self()->parent.name);
+            else
+                rt_smem_setname(mem, "NONE");
+#endif /* RT_USING_MEMTRACE */
+
+            if (mem == small_mem->lfree)
+            {
+                /* Find next free block after mem and update lowest free pointer */
+                while (MEM_ISUSED(small_mem->lfree) && small_mem->lfree != small_mem->heap_end)
+                    small_mem->lfree = (struct rt_small_mem_item *)&small_mem->heap_ptr[small_mem->lfree->next];
+
+                RT_ASSERT(((small_mem->lfree == small_mem->heap_end) || (!MEM_ISUSED(small_mem->lfree))));
+            }
+            RT_ASSERT((rt_uintptr_t)mem + SIZEOF_STRUCT_MEM + size <= (rt_uintptr_t)small_mem->heap_end);
+            RT_ASSERT((rt_uintptr_t)((rt_uint8_t *)mem + SIZEOF_STRUCT_MEM) % RT_ALIGN_SIZE == 0);
+            RT_ASSERT((((rt_uintptr_t)mem) & (RT_ALIGN_SIZE - 1)) == 0);
+
+            LOG_D("allocate memory at 0x%x, size: %d",
+                    (rt_uintptr_t)((rt_uint8_t *)mem + SIZEOF_STRUCT_MEM),
+                    (rt_uintptr_t)(mem->next - ((rt_uint8_t *)mem - small_mem->heap_ptr)));
+
+            /* return the memory data except mem struct */
+            return (rt_uint8_t *)mem + SIZEOF_STRUCT_MEM;
+        }
+    }
+
+    return RT_NULL;
+}
+RTM_EXPORT(rt_smem_alloc);
+
+/**
+ * @brief This function will change the size of previously allocated memory block.
+ *
+ * @param m the small memory management object.
+ *
+ * @param rmem is the pointer to memory allocated by rt_mem_alloc.
+ *
+ * @param newsize is the required new size.
+ *
+ * @return the changed memory block address.
+ */
+void *rt_smem_realloc(rt_smem_t m, void *rmem, rt_size_t newsize)
+{
+    rt_size_t size;
+    rt_size_t ptr, ptr2;
+    struct rt_small_mem_item *mem, *mem2;
+    struct rt_small_mem *small_mem;
+    void *nmem;
+
+    RT_ASSERT(m != RT_NULL);
+    RT_ASSERT(rt_object_get_type(&m->parent) == RT_Object_Class_Memory);
+    RT_ASSERT(rt_object_is_systemobject(&m->parent));
+
+    small_mem = (struct rt_small_mem *)m;
+    /* alignment size */
+    newsize = RT_ALIGN(newsize, RT_ALIGN_SIZE);
+    if (newsize > small_mem->mem_size_aligned)
+    {
+        LOG_D("realloc: out of memory");
+
+        return RT_NULL;
+    }
+    else if (newsize == 0)
+    {
+        rt_smem_free(rmem);
+        return RT_NULL;
+    }
+
+    /* allocate a new memory block */
+    if (rmem == RT_NULL)
+        return rt_smem_alloc(&small_mem->parent, newsize);
+
+    RT_ASSERT((((rt_uintptr_t)rmem) & (RT_ALIGN_SIZE - 1)) == 0);
+    RT_ASSERT((rt_uint8_t *)rmem >= (rt_uint8_t *)small_mem->heap_ptr);
+    RT_ASSERT((rt_uint8_t *)rmem < (rt_uint8_t *)small_mem->heap_end);
+
+    mem = (struct rt_small_mem_item *)((rt_uint8_t *)rmem - SIZEOF_STRUCT_MEM);
+
+    /* current memory block size */
+    ptr = (rt_uint8_t *)mem - small_mem->heap_ptr;
+    size = mem->next - ptr - SIZEOF_STRUCT_MEM;
+    if (size == newsize)
+    {
+        /* the size is the same as */
+        return rmem;
+    }
+
+    if (newsize + SIZEOF_STRUCT_MEM + MIN_SIZE < size)
+    {
+        /* split memory block */
+        small_mem->parent.used -= (size - newsize);
+
+        ptr2 = ptr + SIZEOF_STRUCT_MEM + newsize;
+        mem2 = (struct rt_small_mem_item *)&small_mem->heap_ptr[ptr2];
+        mem2->pool_ptr = MEM_FREED(small_mem);
+        mem2->next = mem->next;
+        mem2->prev = ptr;
+#ifdef RT_USING_MEMTRACE
+        rt_smem_setname(mem2, "    ");
+#endif /* RT_USING_MEMTRACE */
+        mem->next = ptr2;
+        if (mem2->next != small_mem->mem_size_aligned + SIZEOF_STRUCT_MEM)
+        {
+            ((struct rt_small_mem_item *)&small_mem->heap_ptr[mem2->next])->prev = ptr2;
+        }
+
+        if (mem2 < small_mem->lfree)
+        {
+            /* the splited struct is now the lowest */
+            small_mem->lfree = mem2;
+        }
+
+        plug_holes(small_mem, mem2);
+
+        return rmem;
+    }
+
+    /* expand memory */
+    nmem = rt_smem_alloc(&small_mem->parent, newsize);
+    if (nmem != RT_NULL) /* check memory */
+    {
+        rt_memcpy(nmem, rmem, size < newsize ? size : newsize);
+        rt_smem_free(rmem);
+    }
+
+    return nmem;
+}
+RTM_EXPORT(rt_smem_realloc);
+
+/**
+ * @brief This function will release the previously allocated memory block by
+ *        rt_mem_alloc. The released memory block is taken back to system heap.
+ *
+ * @param rmem the address of memory which will be released.
+ */
+void rt_smem_free(void *rmem)
+{
+    struct rt_small_mem_item *mem;
+    struct rt_small_mem *small_mem;
+
+    if (rmem == RT_NULL)
+        return;
+
+    RT_ASSERT((((rt_uintptr_t)rmem) & (RT_ALIGN_SIZE - 1)) == 0);
+
+    /* Get the corresponding struct rt_small_mem_item ... */
+    mem = (struct rt_small_mem_item *)((rt_uint8_t *)rmem - SIZEOF_STRUCT_MEM);
+    /* ... which has to be in a used state ... */
+    small_mem = MEM_POOL(mem);
+    RT_ASSERT(small_mem != RT_NULL);
+    RT_ASSERT(MEM_ISUSED(mem));
+    RT_ASSERT(rt_object_get_type(&small_mem->parent.parent) == RT_Object_Class_Memory);
+    RT_ASSERT(rt_object_is_systemobject(&small_mem->parent.parent));
+    RT_ASSERT((rt_uint8_t *)rmem >= (rt_uint8_t *)small_mem->heap_ptr &&
+              (rt_uint8_t *)rmem < (rt_uint8_t *)small_mem->heap_end);
+    RT_ASSERT(MEM_POOL(&small_mem->heap_ptr[mem->next]) == small_mem);
+
+    LOG_D("release memory 0x%x, size: %d",
+            (rt_uintptr_t)rmem,
+            (rt_uintptr_t)(mem->next - ((rt_uint8_t *)mem - small_mem->heap_ptr)));
+
+    /* ... and is now unused. */
+    mem->pool_ptr = MEM_FREED(small_mem);
+#ifdef RT_USING_MEMTRACE
+    rt_smem_setname(mem, "    ");
+#endif /* RT_USING_MEMTRACE */
+
+    if (mem < small_mem->lfree)
+    {
+        /* the newly freed struct is now the lowest */
+        small_mem->lfree = mem;
+    }
+
+    small_mem->parent.used -= (mem->next - ((rt_uint8_t *)mem - small_mem->heap_ptr));
+
+    /* finally, see if prev or next are free also */
+    plug_holes(small_mem, mem);
+}
+RTM_EXPORT(rt_smem_free);
+
+#ifdef RT_USING_FINSH
+#include <finsh.h>
+
+#ifdef RT_USING_MEMTRACE
+static int memcheck(int argc, char *argv[])
+{
+    int position;
+    rt_base_t level;
+    struct rt_small_mem_item *mem;
+    struct rt_small_mem *m;
+    struct rt_object_information *information;
+    struct rt_list_node *node;
+    struct rt_object *object;
+    char *name;
+
+    name = argc > 1 ? argv[1] : RT_NULL;
+    level = rt_hw_interrupt_disable();
+    /* get mem object */
+    information = rt_object_get_information(RT_Object_Class_Memory);
+    for (node = information->object_list.next;
+         node != &(information->object_list);
+         node  = node->next)
+    {
+        object = rt_list_entry(node, struct rt_object, list);
+        /* find the specified object */
+        if (name != RT_NULL && rt_strncmp(name, object->name, RT_NAME_MAX) != 0)
+        {
+            continue;
+        }
+        /* mem object */
+        m = (struct rt_small_mem *)object;
+        if(rt_strncmp(m->parent.algorithm, "small", RT_NAME_MAX) != 0)
+        {
+            continue;
+        }
+
+        /* check mem */
+        for (mem = (struct rt_small_mem_item *)m->heap_ptr; mem != m->heap_end; mem = (struct rt_small_mem_item *)&m->heap_ptr[mem->next])
+        {
+            position = (rt_uintptr_t)mem - (rt_uintptr_t)m->heap_ptr;
+            if (position < 0) goto __exit;
+            if (position > (int)m->mem_size_aligned) goto __exit;
+            if (MEM_POOL(mem) != m) goto __exit;
+        }
+    }
+    rt_hw_interrupt_enable(level);
+
+    return 0;
+__exit:
+    rt_kprintf("Memory block wrong:\n");
+    rt_kprintf("   name: %s\n", m->parent.parent.name);
+    rt_kprintf("address: 0x%08x\n", mem);
+    rt_kprintf("   pool: 0x%04x\n", mem->pool_ptr);
+    rt_kprintf("   size: %d\n", mem->next - position - SIZEOF_STRUCT_MEM);
+    rt_hw_interrupt_enable(level);
+
+    return 0;
+}
+MSH_CMD_EXPORT(memcheck, check memory data);
+
+static int memtrace(int argc, char **argv)
+{
+    struct rt_small_mem_item *mem;
+    struct rt_small_mem *m;
+    struct rt_object_information *information;
+    struct rt_list_node *node;
+    struct rt_object *object;
+    char *name;
+
+    name = argc > 1 ? argv[1] : RT_NULL;
+    /* get mem object */
+    information = rt_object_get_information(RT_Object_Class_Memory);
+    for (node = information->object_list.next;
+         node != &(information->object_list);
+         node  = node->next)
+    {
+        object = rt_list_entry(node, struct rt_object, list);
+        /* find the specified object */
+        if (name != RT_NULL && rt_strncmp(name, object->name, RT_NAME_MAX) != 0)
+        {
+            continue;
+        }
+        /* mem object */
+        m = (struct rt_small_mem *)object;
+        if(rt_strncmp(m->parent.algorithm, "small", RT_NAME_MAX) != 0)
+        {
+            continue;
+        }
+        /* show memory information */
+        rt_kprintf("\nmemory heap address:\n");
+        rt_kprintf("name    : %s\n", m->parent.parent.name);
+        rt_kprintf("total   : %d\n", m->parent.total);
+        rt_kprintf("used    : %d\n", m->parent.used);
+        rt_kprintf("max_used: %d\n", m->parent.max);
+        rt_kprintf("heap_ptr: 0x%08x\n", m->heap_ptr);
+        rt_kprintf("lfree   : 0x%08x\n", m->lfree);
+        rt_kprintf("heap_end: 0x%08x\n", m->heap_end);
+        rt_kprintf("\n--memory item information --\n");
+        for (mem = (struct rt_small_mem_item *)m->heap_ptr; mem != m->heap_end; mem = (struct rt_small_mem_item *)&m->heap_ptr[mem->next])
+        {
+            int size = MEM_SIZE(m, mem);
+
+            rt_kprintf("[0x%08x - ", mem);
+            if (size < 1024)
+                rt_kprintf("%5d", size);
+            else if (size < 1024 * 1024)
+                rt_kprintf("%4dK", size / 1024);
+            else
+                rt_kprintf("%4dM", size / (1024 * 1024));
+
+            rt_kprintf("] %c%c%c%c", mem->thread[0], mem->thread[1], mem->thread[2], mem->thread[3]);
+            if (MEM_POOL(mem) != m)
+                rt_kprintf(": ***\n");
+            else
+                rt_kprintf("\n");
+        }
+    }
+    return 0;
+}
+MSH_CMD_EXPORT(memtrace, dump memory trace information);
+#endif /* RT_USING_MEMTRACE */
+#endif /* RT_USING_FINSH */
+
+#endif /* defined (RT_USING_SMALL_MEM) */
+
+/**@}*/

rt-thread/src/memheap.c

@@ -0,0 +1,998 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*
+ * File      : memheap.c
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2012-04-10     Bernard      first implementation
+ * 2012-10-16     Bernard      add the mutex lock for heap object.
+ * 2012-12-29     Bernard      memheap can be used as system heap.
+ *                             change mutex lock to semaphore lock.
+ * 2013-04-10     Bernard      add rt_memheap_realloc function.
+ * 2013-05-24     Bernard      fix the rt_memheap_realloc issue.
+ * 2013-07-11     Grissiom     fix the memory block splitting issue.
+ * 2013-07-15     Grissiom     optimize rt_memheap_realloc
+ * 2021-06-03     Flybreak     Fix the crash problem after opening Oz optimization on ac6.
+ * 2023-03-01     Bernard      Fix the alignment issue for minimal size
+ */
+
+#include <rthw.h>
+#include <rtthread.h>
+
+#ifdef RT_USING_MEMHEAP
+
+#define DBG_TAG           "kernel.memheap"
+#define DBG_LVL           DBG_INFO
+#include <rtdbg.h>
+
+/* dynamic pool magic and mask */
+#define RT_MEMHEAP_MAGIC        0x1ea01ea0
+#define RT_MEMHEAP_MASK         0xFFFFFFFE
+#define RT_MEMHEAP_USED         0x01
+#define RT_MEMHEAP_FREED        0x00
+
+#define RT_MEMHEAP_IS_USED(i)   ((i)->magic & RT_MEMHEAP_USED)
+#define RT_MEMHEAP_MINIALLOC    RT_ALIGN(12, RT_ALIGN_SIZE)
+
+#define RT_MEMHEAP_SIZE         RT_ALIGN(sizeof(struct rt_memheap_item), RT_ALIGN_SIZE)
+#define MEMITEM_SIZE(item)      ((rt_uintptr_t)item->next - (rt_uintptr_t)item - RT_MEMHEAP_SIZE)
+#define MEMITEM(ptr)            (struct rt_memheap_item*)((rt_uint8_t*)ptr - RT_MEMHEAP_SIZE)
+
+static void _remove_next_ptr(volatile struct rt_memheap_item *next_ptr)
+{
+    /* Fix the crash problem after opening Oz optimization on ac6  */
+    /* Fix IAR compiler warning  */
+    next_ptr->next_free->prev_free = next_ptr->prev_free;
+    next_ptr->prev_free->next_free = next_ptr->next_free;
+    next_ptr->next->prev = next_ptr->prev;
+    next_ptr->prev->next = next_ptr->next;
+}
+
+/**
+ * @brief   This function initializes a piece of memory called memheap.
+ *
+ * @note    The initialized memory pool will be:
+ *          +-----------------------------------+--------------------------+
+ *          | whole freed memory block          | Used Memory Block Tailer |
+ *          +-----------------------------------+--------------------------+
+ *
+ *          block_list --> whole freed memory block
+ *
+ *          The length of Used Memory Block Tailer is 0,
+ *          which is prevents block merging across list
+ *
+ * @param   memheap is a pointer of the memheap object.
+ *
+ * @param   name is the name of the memheap.
+ *
+ * @param   start_addr is the start address of the memheap.
+ *
+ * @param   size is the size of the memheap.
+ *
+ * @return  RT_EOK
+ */
+rt_err_t rt_memheap_init(struct rt_memheap *memheap,
+                         const char        *name,
+                         void              *start_addr,
+                         rt_size_t         size)
+{
+    struct rt_memheap_item *item;
+
+    RT_ASSERT(memheap != RT_NULL);
+
+    /* initialize pool object */
+    rt_object_init(&(memheap->parent), RT_Object_Class_MemHeap, name);
+
+    memheap->start_addr     = start_addr;
+    memheap->pool_size      = RT_ALIGN_DOWN(size, RT_ALIGN_SIZE);
+    memheap->available_size = memheap->pool_size - (2 * RT_MEMHEAP_SIZE);
+    memheap->max_used_size  = memheap->pool_size - memheap->available_size;
+
+    /* initialize the free list header */
+    item            = &(memheap->free_header);
+    item->magic     = (RT_MEMHEAP_MAGIC | RT_MEMHEAP_FREED);
+    item->pool_ptr  = memheap;
+    item->next      = RT_NULL;
+    item->prev      = RT_NULL;
+    item->next_free = item;
+    item->prev_free = item;
+
+    /* set the free list to free list header */
+    memheap->free_list = item;
+
+    /* initialize the first big memory block */
+    item            = (struct rt_memheap_item *)start_addr;
+    item->magic     = (RT_MEMHEAP_MAGIC | RT_MEMHEAP_FREED);
+    item->pool_ptr  = memheap;
+    item->next      = RT_NULL;
+    item->prev      = RT_NULL;
+    item->next_free = item;
+    item->prev_free = item;
+
+#ifdef RT_USING_MEMTRACE
+    rt_memset(item->owner_thread_name, ' ', sizeof(item->owner_thread_name));
+#endif /* RT_USING_MEMTRACE */
+
+    item->next = (struct rt_memheap_item *)
+                 ((rt_uint8_t *)item + memheap->available_size + RT_MEMHEAP_SIZE);
+    item->prev = item->next;
+
+    /* block list header */
+    memheap->block_list = item;
+
+    /* place the big memory block to free list */
+    item->next_free = memheap->free_list->next_free;
+    item->prev_free = memheap->free_list;
+    memheap->free_list->next_free->prev_free = item;
+    memheap->free_list->next_free            = item;
+
+    /* move to the end of memory pool to build a small tailer block,
+     * which prevents block merging
+     */
+    item = item->next;
+    /* it's a used memory block */
+    item->magic     = (RT_MEMHEAP_MAGIC | RT_MEMHEAP_USED);
+    item->pool_ptr  = memheap;
+    item->next      = (struct rt_memheap_item *)start_addr;
+    item->prev      = (struct rt_memheap_item *)start_addr;
+    /* not in free list */
+    item->next_free = item->prev_free = RT_NULL;
+
+    /* initialize semaphore lock */
+    rt_sem_init(&(memheap->lock), name, 1, RT_IPC_FLAG_PRIO);
+    memheap->locked = RT_FALSE;
+
+    LOG_D("memory heap: start addr 0x%08x, size %d, free list header 0x%08x",
+          start_addr, size, &(memheap->free_header));
+
+    return RT_EOK;
+}
+RTM_EXPORT(rt_memheap_init);
+
+/**
+ * @brief   This function will remove a memheap from the system.
+ *
+ * @param   heap is a pointer of memheap object.
+ *
+ * @return  RT_EOK
+ */
+rt_err_t rt_memheap_detach(struct rt_memheap *heap)
+{
+    RT_ASSERT(heap);
+    RT_ASSERT(rt_object_get_type(&heap->parent) == RT_Object_Class_MemHeap);
+    RT_ASSERT(rt_object_is_systemobject(&heap->parent));
+
+    rt_sem_detach(&heap->lock);
+    rt_object_detach(&(heap->parent));
+
+    /* Return a successful completion. */
+    return RT_EOK;
+}
+RTM_EXPORT(rt_memheap_detach);
+
+/**
+ * @brief  Allocate a block of memory with a minimum of 'size' bytes on memheap.
+ *
+ * @param   heap is a pointer for memheap object.
+ *
+ * @param   size is the minimum size of the requested block in bytes.
+ *
+ * @return  the pointer to allocated memory or NULL if no free memory was found.
+ */
+void *rt_memheap_alloc(struct rt_memheap *heap, rt_size_t size)
+{
+    rt_err_t result;
+    rt_size_t free_size;
+    struct rt_memheap_item *header_ptr;
+
+    RT_ASSERT(heap != RT_NULL);
+    RT_ASSERT(rt_object_get_type(&heap->parent) == RT_Object_Class_MemHeap);
+
+    /* align allocated size */
+    size = RT_ALIGN(size, RT_ALIGN_SIZE);
+    if (size < RT_MEMHEAP_MINIALLOC)
+        size = RT_MEMHEAP_MINIALLOC;
+
+    LOG_D("allocate %d on heap:%8.*s",
+          size, RT_NAME_MAX, heap->parent.name);
+
+    if (size < heap->available_size)
+    {
+        /* search on free list */
+        free_size = 0;
+
+        /* lock memheap */
+        if (heap->locked == RT_FALSE)
+        {
+            result = rt_sem_take(&(heap->lock), RT_WAITING_FOREVER);
+            if (result != RT_EOK)
+            {
+                rt_set_errno(result);
+
+                return RT_NULL;
+            }
+        }
+
+        /* get the first free memory block */
+        header_ptr = heap->free_list->next_free;
+        while (header_ptr != heap->free_list && free_size < size)
+        {
+            /* get current freed memory block size */
+            free_size = MEMITEM_SIZE(header_ptr);
+            if (free_size < size)
+            {
+                /* move to next free memory block */
+                header_ptr = header_ptr->next_free;
+            }
+        }
+
+        /* determine if the memory is available. */
+        if (free_size >= size)
+        {
+            /* a block that satisfies the request has been found. */
+
+            /* determine if the block needs to be split. */
+            if (free_size >= (size + RT_MEMHEAP_SIZE + RT_MEMHEAP_MINIALLOC))
+            {
+                struct rt_memheap_item *new_ptr;
+
+                /* split the block. */
+                new_ptr = (struct rt_memheap_item *)
+                          (((rt_uint8_t *)header_ptr) + size + RT_MEMHEAP_SIZE);
+
+                LOG_D("split: block[0x%08x] nextm[0x%08x] prevm[0x%08x] to new[0x%08x]",
+                      header_ptr,
+                      header_ptr->next,
+                      header_ptr->prev,
+                      new_ptr);
+
+                /* mark the new block as a memory block and freed. */
+                new_ptr->magic = (RT_MEMHEAP_MAGIC | RT_MEMHEAP_FREED);
+
+                /* put the pool pointer into the new block. */
+                new_ptr->pool_ptr = heap;
+
+#ifdef RT_USING_MEMTRACE
+                rt_memset(new_ptr->owner_thread_name, ' ', sizeof(new_ptr->owner_thread_name));
+#endif /* RT_USING_MEMTRACE */
+
+                /* break down the block list */
+                new_ptr->prev          = header_ptr;
+                new_ptr->next          = header_ptr->next;
+                header_ptr->next->prev = new_ptr;
+                header_ptr->next       = new_ptr;
+
+                /* remove header ptr from free list */
+                header_ptr->next_free->prev_free = header_ptr->prev_free;
+                header_ptr->prev_free->next_free = header_ptr->next_free;
+                header_ptr->next_free = RT_NULL;
+                header_ptr->prev_free = RT_NULL;
+
+                /* insert new_ptr to free list */
+                new_ptr->next_free = heap->free_list->next_free;
+                new_ptr->prev_free = heap->free_list;
+                heap->free_list->next_free->prev_free = new_ptr;
+                heap->free_list->next_free            = new_ptr;
+                LOG_D("new ptr: next_free 0x%08x, prev_free 0x%08x",
+                      new_ptr->next_free,
+                      new_ptr->prev_free);
+
+                /* decrement the available byte count.  */
+                heap->available_size = heap->available_size -
+                                       size -
+                                       RT_MEMHEAP_SIZE;
+                if (heap->pool_size - heap->available_size > heap->max_used_size)
+                    heap->max_used_size = heap->pool_size - heap->available_size;
+            }
+            else
+            {
+                /* decrement the entire free size from the available bytes count. */
+                heap->available_size = heap->available_size - free_size;
+                if (heap->pool_size - heap->available_size > heap->max_used_size)
+                    heap->max_used_size = heap->pool_size - heap->available_size;
+
+                /* remove header_ptr from free list */
+                LOG_D("one block: block[0x%08x], next_free 0x%08x, prev_free 0x%08x",
+                      header_ptr,
+                      header_ptr->next_free,
+                      header_ptr->prev_free);
+
+                header_ptr->next_free->prev_free = header_ptr->prev_free;
+                header_ptr->prev_free->next_free = header_ptr->next_free;
+                header_ptr->next_free = RT_NULL;
+                header_ptr->prev_free = RT_NULL;
+            }
+
+            /* Mark the allocated block as not available. */
+            header_ptr->magic = (RT_MEMHEAP_MAGIC | RT_MEMHEAP_USED);
+
+#ifdef RT_USING_MEMTRACE
+            if (rt_thread_self())
+                rt_memcpy(header_ptr->owner_thread_name, rt_thread_self()->parent.name, sizeof(header_ptr->owner_thread_name));
+            else
+                rt_memcpy(header_ptr->owner_thread_name, "NONE", sizeof(header_ptr->owner_thread_name));
+#endif /* RT_USING_MEMTRACE */
+
+            if (heap->locked == RT_FALSE)
+            {
+                /* release lock */
+                rt_sem_release(&(heap->lock));
+            }
+
+            /* Return a memory address to the caller.  */
+            LOG_D("alloc mem: memory[0x%08x], heap[0x%08x], size: %d",
+                  (void *)((rt_uint8_t *)header_ptr + RT_MEMHEAP_SIZE),
+                  header_ptr,
+                  size);
+
+            return (void *)((rt_uint8_t *)header_ptr + RT_MEMHEAP_SIZE);
+        }
+
+        if (heap->locked == RT_FALSE)
+        {
+            /* release lock */
+            rt_sem_release(&(heap->lock));
+        }
+    }
+
+    LOG_D("allocate memory: failed");
+
+    /* Return the completion status.  */
+    return RT_NULL;
+}
+RTM_EXPORT(rt_memheap_alloc);
+
+/**
+ * @brief This function will change the size of previously allocated memory block.
+ *
+ * @param heap is a pointer to the memheap object, which will reallocate
+ *             memory from the block
+ *
+ * @param ptr is a pointer to start address of memory.
+ *
+ * @param newsize is the required new size.
+ *
+ * @return the changed memory block address.
+ */
+void *rt_memheap_realloc(struct rt_memheap *heap, void *ptr, rt_size_t newsize)
+{
+    rt_err_t result;
+    rt_size_t oldsize;
+    struct rt_memheap_item *header_ptr;
+    struct rt_memheap_item *new_ptr;
+
+    RT_ASSERT(heap);
+    RT_ASSERT(rt_object_get_type(&heap->parent) == RT_Object_Class_MemHeap);
+
+    if (newsize == 0)
+    {
+        rt_memheap_free(ptr);
+
+        return RT_NULL;
+    }
+    /* align allocated size */
+    newsize = RT_ALIGN(newsize, RT_ALIGN_SIZE);
+    if (newsize < RT_MEMHEAP_MINIALLOC)
+        newsize = RT_MEMHEAP_MINIALLOC;
+
+    if (ptr == RT_NULL)
+    {
+        return rt_memheap_alloc(heap, newsize);
+    }
+
+    /* get memory block header and get the size of memory block */
+    header_ptr = (struct rt_memheap_item *)
+                 ((rt_uint8_t *)ptr - RT_MEMHEAP_SIZE);
+    oldsize = MEMITEM_SIZE(header_ptr);
+    /* re-allocate memory */
+    if (newsize > oldsize)
+    {
+        void *new_ptr;
+        volatile struct rt_memheap_item *next_ptr;
+
+        if (heap->locked == RT_FALSE)
+        {
+            /* lock memheap */
+            result = rt_sem_take(&(heap->lock), RT_WAITING_FOREVER);
+            if (result != RT_EOK)
+            {
+                rt_set_errno(result);
+                return RT_NULL;
+            }
+        }
+
+        next_ptr = header_ptr->next;
+
+        /* header_ptr should not be the tail */
+        RT_ASSERT(next_ptr > header_ptr);
+
+        /* check whether the following free space is enough to expand */
+        if (!RT_MEMHEAP_IS_USED(next_ptr))
+        {
+            rt_int32_t nextsize;
+
+            nextsize = MEMITEM_SIZE(next_ptr);
+            RT_ASSERT(next_ptr > 0);
+
+            /* Here is the ASCII art of the situation that we can make use of
+             * the next free node without alloc/memcpy, |*| is the control
+             * block:
+             *
+             *      oldsize           free node
+             * |*|-----------|*|----------------------|*|
+             *         newsize          >= minialloc
+             * |*|----------------|*|-----------------|*|
+             */
+            if (nextsize + oldsize > newsize + RT_MEMHEAP_MINIALLOC)
+            {
+                /* decrement the entire free size from the available bytes count. */
+                heap->available_size = heap->available_size - (newsize - oldsize);
+                if (heap->pool_size - heap->available_size > heap->max_used_size)
+                    heap->max_used_size = heap->pool_size - heap->available_size;
+
+                /* remove next_ptr from free list */
+                LOG_D("remove block: block[0x%08x], next_free 0x%08x, prev_free 0x%08x",
+                      next_ptr,
+                      next_ptr->next_free,
+                      next_ptr->prev_free);
+
+                _remove_next_ptr(next_ptr);
+
+                /* build a new one on the right place */
+                next_ptr = (struct rt_memheap_item *)((char *)ptr + newsize);
+
+                LOG_D("new free block: block[0x%08x] nextm[0x%08x] prevm[0x%08x]",
+                      next_ptr,
+                      next_ptr->next,
+                      next_ptr->prev);
+
+                /* mark the new block as a memory block and freed. */
+                next_ptr->magic = (RT_MEMHEAP_MAGIC | RT_MEMHEAP_FREED);
+
+                /* put the pool pointer into the new block. */
+                next_ptr->pool_ptr = heap;
+
+#ifdef RT_USING_MEMTRACE
+                rt_memset((void *)next_ptr->owner_thread_name, ' ', sizeof(next_ptr->owner_thread_name));
+#endif /* RT_USING_MEMTRACE */
+
+                next_ptr->prev          = header_ptr;
+                next_ptr->next          = header_ptr->next;
+                header_ptr->next->prev = (struct rt_memheap_item *)next_ptr;
+                header_ptr->next       = (struct rt_memheap_item *)next_ptr;
+
+                /* insert next_ptr to free list */
+                next_ptr->next_free = heap->free_list->next_free;
+                next_ptr->prev_free = heap->free_list;
+                heap->free_list->next_free->prev_free = (struct rt_memheap_item *)next_ptr;
+                heap->free_list->next_free            = (struct rt_memheap_item *)next_ptr;
+                LOG_D("new ptr: next_free 0x%08x, prev_free 0x%08x",
+                      next_ptr->next_free,
+                      next_ptr->prev_free);
+                if (heap->locked == RT_FALSE)
+                {
+                    /* release lock */
+                    rt_sem_release(&(heap->lock));
+                }
+
+                return ptr;
+            }
+        }
+
+        if (heap->locked == RT_FALSE)
+        {
+            /* release lock */
+            rt_sem_release(&(heap->lock));
+        }
+
+        /* re-allocate a memory block */
+        new_ptr = (void *)rt_memheap_alloc(heap, newsize);
+        if (new_ptr != RT_NULL)
+        {
+            rt_memcpy(new_ptr, ptr, oldsize < newsize ? oldsize : newsize);
+            rt_memheap_free(ptr);
+        }
+
+        return new_ptr;
+    }
+
+    /* don't split when there is less than one node space left */
+    if (newsize + RT_MEMHEAP_SIZE + RT_MEMHEAP_MINIALLOC >= oldsize)
+        return ptr;
+
+    if (heap->locked == RT_FALSE)
+    {
+        /* lock memheap */
+        result = rt_sem_take(&(heap->lock), RT_WAITING_FOREVER);
+        if (result != RT_EOK)
+        {
+            rt_set_errno(result);
+
+            return RT_NULL;
+        }
+    }
+
+    /* split the block. */
+    new_ptr = (struct rt_memheap_item *)
+              (((rt_uint8_t *)header_ptr) + newsize + RT_MEMHEAP_SIZE);
+
+    LOG_D("split: block[0x%08x] nextm[0x%08x] prevm[0x%08x] to new[0x%08x]",
+          header_ptr,
+          header_ptr->next,
+          header_ptr->prev,
+          new_ptr);
+
+    /* mark the new block as a memory block and freed. */
+    new_ptr->magic = (RT_MEMHEAP_MAGIC | RT_MEMHEAP_FREED);
+    /* put the pool pointer into the new block. */
+    new_ptr->pool_ptr = heap;
+
+#ifdef RT_USING_MEMTRACE
+    rt_memset(new_ptr->owner_thread_name, ' ', sizeof(new_ptr->owner_thread_name));
+#endif /* RT_USING_MEMTRACE */
+
+    /* break down the block list */
+    new_ptr->prev          = header_ptr;
+    new_ptr->next          = header_ptr->next;
+    header_ptr->next->prev = new_ptr;
+    header_ptr->next       = new_ptr;
+
+    /* determine if the block can be merged with the next neighbor. */
+    if (!RT_MEMHEAP_IS_USED(new_ptr->next))
+    {
+        struct rt_memheap_item *free_ptr;
+
+        /* merge block with next neighbor. */
+        free_ptr = new_ptr->next;
+        heap->available_size = heap->available_size - MEMITEM_SIZE(free_ptr);
+
+        LOG_D("merge: right node 0x%08x, next_free 0x%08x, prev_free 0x%08x",
+              header_ptr, header_ptr->next_free, header_ptr->prev_free);
+
+        free_ptr->next->prev = new_ptr;
+        new_ptr->next   = free_ptr->next;
+
+        /* remove free ptr from free list */
+        free_ptr->next_free->prev_free = free_ptr->prev_free;
+        free_ptr->prev_free->next_free = free_ptr->next_free;
+    }
+
+    /* insert the split block to free list */
+    new_ptr->next_free = heap->free_list->next_free;
+    new_ptr->prev_free = heap->free_list;
+    heap->free_list->next_free->prev_free = new_ptr;
+    heap->free_list->next_free            = new_ptr;
+    LOG_D("new free ptr: next_free 0x%08x, prev_free 0x%08x",
+          new_ptr->next_free,
+          new_ptr->prev_free);
+
+    /* increment the available byte count.  */
+    heap->available_size = heap->available_size + MEMITEM_SIZE(new_ptr);
+
+    if (heap->locked == RT_FALSE)
+    {
+        /* release lock */
+        rt_sem_release(&(heap->lock));
+    }
+
+    /* return the old memory block */
+    return ptr;
+}
+RTM_EXPORT(rt_memheap_realloc);
+
+/**
+ * @brief This function will release the allocated memory block by
+ *        rt_malloc. The released memory block is taken back to system heap.
+ *
+ * @param ptr the address of memory which will be released.
+ */
+void rt_memheap_free(void *ptr)
+{
+    rt_err_t result;
+    struct rt_memheap *heap;
+    struct rt_memheap_item *header_ptr, *new_ptr;
+    rt_bool_t insert_header;
+
+    /* NULL check */
+    if (ptr == RT_NULL) return;
+
+    /* set initial status as OK */
+    insert_header = RT_TRUE;
+    new_ptr       = RT_NULL;
+    header_ptr    = (struct rt_memheap_item *)
+                    ((rt_uint8_t *)ptr - RT_MEMHEAP_SIZE);
+
+    LOG_D("free memory: memory[0x%08x], block[0x%08x]",
+          ptr, header_ptr);
+
+    /* check magic */
+    if (header_ptr->magic != (RT_MEMHEAP_MAGIC | RT_MEMHEAP_USED) ||
+       (header_ptr->next->magic & RT_MEMHEAP_MASK) != RT_MEMHEAP_MAGIC)
+    {
+        LOG_D("bad magic:0x%08x @ memheap",
+              header_ptr->magic);
+        RT_ASSERT(header_ptr->magic == (RT_MEMHEAP_MAGIC | RT_MEMHEAP_USED));
+        /* check whether this block of memory has been over-written. */
+        RT_ASSERT((header_ptr->next->magic & RT_MEMHEAP_MASK) == RT_MEMHEAP_MAGIC);
+    }
+
+    /* get pool ptr */
+    heap = header_ptr->pool_ptr;
+
+    RT_ASSERT(heap);
+    RT_ASSERT(rt_object_get_type(&heap->parent) == RT_Object_Class_MemHeap);
+
+    if (heap->locked == RT_FALSE)
+    {
+        /* lock memheap */
+        result = rt_sem_take(&(heap->lock), RT_WAITING_FOREVER);
+        if (result != RT_EOK)
+        {
+            rt_set_errno(result);
+
+            return ;
+        }
+    }
+
+    /* Mark the memory as available. */
+    header_ptr->magic = (RT_MEMHEAP_MAGIC | RT_MEMHEAP_FREED);
+    /* Adjust the available number of bytes. */
+    heap->available_size += MEMITEM_SIZE(header_ptr);
+
+    /* Determine if the block can be merged with the previous neighbor. */
+    if (!RT_MEMHEAP_IS_USED(header_ptr->prev))
+    {
+        LOG_D("merge: left node 0x%08x",
+              header_ptr->prev);
+
+        /* adjust the available number of bytes. */
+        heap->available_size += RT_MEMHEAP_SIZE;
+
+        /* yes, merge block with previous neighbor. */
+        (header_ptr->prev)->next = header_ptr->next;
+        (header_ptr->next)->prev = header_ptr->prev;
+
+        /* move header pointer to previous. */
+        header_ptr = header_ptr->prev;
+        /* don't insert header to free list */
+        insert_header = RT_FALSE;
+    }
+
+    /* determine if the block can be merged with the next neighbor. */
+    if (!RT_MEMHEAP_IS_USED(header_ptr->next))
+    {
+        /* adjust the available number of bytes. */
+        heap->available_size += RT_MEMHEAP_SIZE;
+
+        /* merge block with next neighbor. */
+        new_ptr = header_ptr->next;
+
+        LOG_D("merge: right node 0x%08x, next_free 0x%08x, prev_free 0x%08x",
+              new_ptr, new_ptr->next_free, new_ptr->prev_free);
+
+        new_ptr->next->prev = header_ptr;
+        header_ptr->next    = new_ptr->next;
+
+        /* remove new ptr from free list */
+        new_ptr->next_free->prev_free = new_ptr->prev_free;
+        new_ptr->prev_free->next_free = new_ptr->next_free;
+    }
+
+    if (insert_header)
+    {
+        struct rt_memheap_item *n = heap->free_list->next_free;
+#if defined(RT_MEMHEAP_BEST_MODE)
+        rt_size_t blk_size = MEMITEM_SIZE(header_ptr);
+        for (;n != heap->free_list; n = n->next_free)
+        {
+            rt_size_t m = MEMITEM_SIZE(n);
+            if (blk_size <= m)
+            {
+                break;
+            }
+        }
+#endif
+        /* no left merge, insert to free list */
+        header_ptr->next_free = n;
+        header_ptr->prev_free = n->prev_free;
+        n->prev_free->next_free = header_ptr;
+        n->prev_free = header_ptr;
+
+        LOG_D("insert to free list: next_free 0x%08x, prev_free 0x%08x",
+              header_ptr->next_free, header_ptr->prev_free);
+    }
+
+#ifdef RT_USING_MEMTRACE
+    rt_memset(header_ptr->owner_thread_name, ' ', sizeof(header_ptr->owner_thread_name));
+#endif /* RT_USING_MEMTRACE */
+
+    if (heap->locked == RT_FALSE)
+    {
+        /* release lock */
+        rt_sem_release(&(heap->lock));
+    }
+}
+RTM_EXPORT(rt_memheap_free);
+
+/**
+* @brief This function will caculate the total memory, the used memory, and
+*        the max used memory.
+*
+* @param heap is a pointer to the memheap object, which will reallocate
+*             memory from the block
+*
+* @param total is a pointer to get the total size of the memory.
+*
+* @param used is a pointer to get the size of memory used.
+*
+* @param max_used is a pointer to get the maximum memory used.
+*/
+void rt_memheap_info(struct rt_memheap *heap,
+                     rt_size_t *total,
+                     rt_size_t *used,
+                     rt_size_t *max_used)
+{
+    rt_err_t result;
+
+    if (heap->locked == RT_FALSE)
+    {
+        /* lock memheap */
+        result = rt_sem_take(&(heap->lock), RT_WAITING_FOREVER);
+        if (result != RT_EOK)
+        {
+            rt_set_errno(result);
+            return;
+        }
+    }
+
+    if (total != RT_NULL)
+        *total = heap->pool_size;
+
+    if (used  != RT_NULL)
+        *used = heap->pool_size - heap->available_size;
+
+    if (max_used != RT_NULL)
+        *max_used = heap->max_used_size;
+
+    if (heap->locked == RT_FALSE)
+    {
+        /* release lock */
+        rt_sem_release(&(heap->lock));
+    }
+}
+
+#ifdef RT_USING_MEMHEAP_AS_HEAP
+/*
+ * rt_malloc port function
+*/
+void *_memheap_alloc(struct rt_memheap *heap, rt_size_t size)
+{
+    void *ptr;
+
+    /* try to allocate in system heap */
+    ptr = rt_memheap_alloc(heap, size);
+#ifdef RT_USING_MEMHEAP_AUTO_BINDING
+    if (ptr == RT_NULL)
+    {
+        struct rt_object *object;
+        struct rt_list_node *node;
+        struct rt_memheap *_heap;
+        struct rt_object_information *information;
+
+        /* try to allocate on other memory heap */
+        information = rt_object_get_information(RT_Object_Class_MemHeap);
+        RT_ASSERT(information != RT_NULL);
+        for (node  = information->object_list.next;
+             node != &(information->object_list);
+             node  = node->next)
+        {
+            object = rt_list_entry(node, struct rt_object, list);
+            _heap   = (struct rt_memheap *)object;
+
+            /* not allocate in the default system heap */
+            if (heap == _heap)
+                continue;
+
+            ptr = rt_memheap_alloc(_heap, size);
+            if (ptr != RT_NULL)
+                break;
+        }
+    }
+#endif /* RT_USING_MEMHEAP_AUTO_BINDING */
+    return ptr;
+}
+
+/*
+ * rt_free port function
+*/
+void _memheap_free(void *rmem)
+{
+    rt_memheap_free(rmem);
+}
+
+/*
+ * rt_realloc port function
+*/
+void *_memheap_realloc(struct rt_memheap *heap, void *rmem, rt_size_t newsize)
+{
+    void *new_ptr;
+    struct rt_memheap_item *header_ptr;
+
+    if (rmem == RT_NULL)
+        return _memheap_alloc(heap, newsize);
+
+    if (newsize == 0)
+    {
+        _memheap_free(rmem);
+        return RT_NULL;
+    }
+
+    /* get old memory item */
+    header_ptr = (struct rt_memheap_item *)
+                 ((rt_uint8_t *)rmem - RT_MEMHEAP_SIZE);
+
+    new_ptr = rt_memheap_realloc(header_ptr->pool_ptr, rmem, newsize);
+    if (new_ptr == RT_NULL && newsize != 0)
+    {
+        /* allocate memory block from other memheap */
+        new_ptr = _memheap_alloc(heap, newsize);
+        if (new_ptr != RT_NULL && rmem != RT_NULL)
+        {
+            rt_size_t oldsize;
+
+            /* get the size of old memory block */
+            oldsize = MEMITEM_SIZE(header_ptr);
+            if (newsize > oldsize)
+                rt_memcpy(new_ptr, rmem, oldsize);
+            else
+                rt_memcpy(new_ptr, rmem, newsize);
+
+            _memheap_free(rmem);
+        }
+    }
+
+    return new_ptr;
+}
+#endif
+
+#ifdef RT_USING_MEMTRACE
+static int memheapcheck(int argc, char *argv[])
+{
+    struct rt_object_information *info;
+    struct rt_list_node *list;
+    struct rt_memheap *heap;
+    struct rt_list_node *node;
+    struct rt_memheap_item *item;
+    rt_bool_t has_bad = RT_FALSE;
+    rt_base_t level;
+    char *name;
+
+    name = argc > 1 ? argv[1] : RT_NULL;
+    level = rt_hw_interrupt_disable();
+    info = rt_object_get_information(RT_Object_Class_MemHeap);
+    list = &info->object_list;
+    for (node = list->next; node != list; node = node->next)
+    {
+        heap = (struct rt_memheap *)rt_list_entry(node, struct rt_object, list);
+        /* find the specified object */
+        if (name != RT_NULL && rt_strncmp(name, heap->parent.name, RT_NAME_MAX) != 0)
+            continue;
+        /* check memheap */
+        for (item = heap->block_list; item->next != heap->block_list; item = item->next)
+        {
+            /* check magic */
+            if (!((item->magic & (RT_MEMHEAP_MAGIC | RT_MEMHEAP_FREED)) == (RT_MEMHEAP_MAGIC | RT_MEMHEAP_FREED) ||
+                 (item->magic & (RT_MEMHEAP_MAGIC | RT_MEMHEAP_USED))  == (RT_MEMHEAP_MAGIC | RT_MEMHEAP_USED)))
+            {
+                has_bad = RT_TRUE;
+                break;
+            }
+            /* check pool_ptr */
+            if (heap != item->pool_ptr)
+            {
+                has_bad = RT_TRUE;
+                break;
+            }
+            /* check next and prev */
+            if (!((rt_uintptr_t)item->next <= (rt_uintptr_t)((rt_uintptr_t)heap->start_addr + heap->pool_size) &&
+                  (rt_uintptr_t)item->prev >= (rt_uintptr_t)heap->start_addr) &&
+                  (rt_uintptr_t)item->next == RT_ALIGN((rt_uintptr_t)item->next, RT_ALIGN_SIZE) &&
+                  (rt_uintptr_t)item->prev == RT_ALIGN((rt_uintptr_t)item->prev, RT_ALIGN_SIZE))
+            {
+                has_bad = RT_TRUE;
+                break;
+            }
+            /* check item */
+            if (item->next == item->next->prev)
+            {
+                has_bad = RT_TRUE;
+                break;
+            }
+        }
+    }
+    rt_hw_interrupt_enable(level);
+    if (has_bad)
+    {
+        rt_kprintf("Memory block wrong:\n");
+        rt_kprintf("name: %s\n", heap->parent.name);
+        rt_kprintf("item: 0x%p\n", item);
+    }
+    return 0;
+}
+MSH_CMD_EXPORT(memheapcheck, check memory for memheap);
+
+static int memheaptrace(int argc, char *argv[])
+{
+    struct rt_object_information *info;
+    struct rt_list_node *list;
+    struct rt_memheap *mh;
+    struct rt_list_node *node;
+    char *name;
+
+    name = argc > 1 ? argv[1] : RT_NULL;
+    info = rt_object_get_information(RT_Object_Class_MemHeap);
+    list = &info->object_list;
+    for (node = list->next; node != list; node = node->next)
+    {
+        struct rt_memheap_item *header_ptr;
+        long block_size;
+
+        mh = (struct rt_memheap *)rt_list_entry(node, struct rt_object, list);
+        /* find the specified object */
+        if (name != RT_NULL && rt_strncmp(name, mh->parent.name, RT_NAME_MAX) != 0)
+            continue;
+        /* memheap dump */
+        rt_kprintf("\nmemory heap address:\n");
+        rt_kprintf("name    : %s\n", mh->parent.name);
+        rt_kprintf("heap_ptr: 0x%p\n", mh->start_addr);
+        rt_kprintf("free    : 0x%08x\n", mh->available_size);
+        rt_kprintf("max_used: 0x%08x\n", mh->max_used_size);
+        rt_kprintf("size    : 0x%08x\n", mh->pool_size);
+        rt_kprintf("\n--memory used information --\n");
+        /* memheap item */
+        for (header_ptr = mh->block_list;
+             header_ptr->next != mh->block_list;
+             header_ptr = header_ptr->next)
+        {
+            if ((header_ptr->magic & RT_MEMHEAP_MASK) != RT_MEMHEAP_MAGIC)
+            {
+                rt_kprintf("[0x%p - incorrect magic: 0x%08x\n",
+                    header_ptr, header_ptr->magic);
+                break;
+            }
+            /* get current memory block size */
+            block_size = MEMITEM_SIZE(header_ptr);
+            if (block_size < 0)
+                break;
+
+            rt_kprintf("[0x%p - ", header_ptr);
+            if (block_size < 1024)
+                rt_kprintf("%5d", block_size);
+            else if (block_size < 1024 * 1024)
+                rt_kprintf("%4dK", block_size / 1024);
+            else if (block_size < 1024 * 1024 * 100)
+                rt_kprintf("%2d.%dM", block_size / (1024 * 1024),  (block_size % (1024 * 1024) * 10) / (1024 * 1024));
+            else
+                rt_kprintf("%4dM", block_size / (1024 * 1024));
+            /* dump thread name */
+            rt_kprintf("] %c%c%c%c\n",
+                header_ptr->owner_thread_name[0],
+                header_ptr->owner_thread_name[1],
+                header_ptr->owner_thread_name[2],
+                header_ptr->owner_thread_name[3]);
+        }
+    }
+    return 0;
+}
+
+#ifdef RT_USING_FINSH
+#include <finsh.h>
+MSH_CMD_EXPORT(memheaptrace, dump memory trace for memheap);
+#endif /* RT_USING_FINSH */
+#endif /* RT_USING_MEMTRACE */
+#endif /* RT_USING_MEMHEAP */

rt-thread/src/mempool.c

@@ -0,0 +1,411 @@
+/*
+ * Copyright (c) 2006-2022, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2006-05-27     Bernard      implement memory pool
+ * 2006-06-03     Bernard      fix the thread timer init bug
+ * 2006-06-30     Bernard      fix the allocate/free block bug
+ * 2006-08-04     Bernard      add hook support
+ * 2006-08-10     Bernard      fix interrupt bug in rt_mp_alloc
+ * 2010-07-13     Bernard      fix RT_ALIGN issue found by kuronca
+ * 2010-10-26     yi.qiu       add module support in rt_mp_delete
+ * 2011-01-24     Bernard      add object allocation check.
+ * 2012-03-22     Bernard      fix align issue in rt_mp_init and rt_mp_create.
+ * 2022-01-07     Gabriel      Moving __on_rt_xxxxx_hook to mempool.c
+ * 2023-09-15     xqyjlj       perf rt_hw_interrupt_disable/enable
+ * 2023-12-10     xqyjlj       fix spinlock assert
+ */
+
+#include <rthw.h>
+#include <rtthread.h>
+
+#ifdef RT_USING_MEMPOOL
+
+#if defined(RT_USING_HOOK) && defined(RT_HOOK_USING_FUNC_PTR)
+static void (*rt_mp_alloc_hook)(struct rt_mempool *mp, void *block);
+static void (*rt_mp_free_hook)(struct rt_mempool *mp, void *block);
+
+/**
+ * @addtogroup group_hook
+ */
+
+/**@{*/
+
+/**
+ * @brief This function will set a hook function, which will be invoked when a memory
+ *        block is allocated from the memory pool.
+ *
+ * @param hook the hook function
+ */
+void rt_mp_alloc_sethook(void (*hook)(struct rt_mempool *mp, void *block))
+{
+    rt_mp_alloc_hook = hook;
+}
+
+/**
+ * @brief This function will set a hook function, which will be invoked when a memory
+ *        block is released to the memory pool.
+ *
+ * @param hook the hook function
+ */
+void rt_mp_free_sethook(void (*hook)(struct rt_mempool *mp, void *block))
+{
+    rt_mp_free_hook = hook;
+}
+
+/**@}*/
+#endif /* RT_USING_HOOK */
+
+/**
+ * @addtogroup group_memory_management
+ */
+
+/**@{*/
+
+/**
+ * @brief  This function will initialize a memory pool object, normally which is used
+ *         for static object.
+ *
+ * @param  mp is the memory pool object.
+ *
+ * @param  name is the name of the memory pool.
+ *
+ * @param  start is the start address of the memory pool.
+ *
+ * @param  size is the total size of the memory pool.
+ *
+ * @param  block_size is the size for each block..
+ *
+ * @return RT_EOK
+ */
+rt_err_t rt_mp_init(struct rt_mempool *mp,
+                    const char        *name,
+                    void              *start,
+                    rt_size_t          size,
+                    rt_size_t          block_size)
+{
+    rt_uint8_t *block_ptr;
+    rt_size_t offset;
+
+    /* parameter check */
+    RT_ASSERT(mp != RT_NULL);
+    RT_ASSERT(name != RT_NULL);
+    RT_ASSERT(start != RT_NULL);
+    RT_ASSERT(size > 0 && block_size > 0);
+
+    /* initialize object */
+    rt_object_init(&(mp->parent), RT_Object_Class_MemPool, name);
+
+    /* initialize memory pool */
+    mp->start_address = start;
+    mp->size = RT_ALIGN_DOWN(size, RT_ALIGN_SIZE);
+
+    /* align the block size */
+    block_size = RT_ALIGN(block_size, RT_ALIGN_SIZE);
+    mp->block_size = block_size;
+
+    /* align to align size byte */
+    mp->block_total_count = mp->size / (mp->block_size + sizeof(rt_uint8_t *));
+    mp->block_free_count  = mp->block_total_count;
+
+    /* initialize suspended thread list */
+    rt_list_init(&(mp->suspend_thread));
+
+    /* initialize free block list */
+    block_ptr = (rt_uint8_t *)mp->start_address;
+    for (offset = 0; offset < mp->block_total_count; offset ++)
+    {
+        *(rt_uint8_t **)(block_ptr + offset * (block_size + sizeof(rt_uint8_t *))) =
+            (rt_uint8_t *)(block_ptr + (offset + 1) * (block_size + sizeof(rt_uint8_t *)));
+    }
+
+    *(rt_uint8_t **)(block_ptr + (offset - 1) * (block_size + sizeof(rt_uint8_t *))) =
+        RT_NULL;
+
+    mp->block_list = block_ptr;
+    rt_spin_lock_init(&(mp->spinlock));
+
+    return RT_EOK;
+}
+RTM_EXPORT(rt_mp_init);
+
+/**
+ * @brief  This function will detach a memory pool from system object management.
+ *
+ * @param  mp is the memory pool object.
+ *
+ * @return RT_EOK
+ */
+rt_err_t rt_mp_detach(struct rt_mempool *mp)
+{
+    rt_base_t level;
+
+    /* parameter check */
+    RT_ASSERT(mp != RT_NULL);
+    RT_ASSERT(rt_object_get_type(&mp->parent) == RT_Object_Class_MemPool);
+    RT_ASSERT(rt_object_is_systemobject(&mp->parent));
+
+    level = rt_spin_lock_irqsave(&(mp->spinlock));
+    /* wake up all suspended threads */
+    rt_susp_list_resume_all(&mp->suspend_thread, RT_ERROR);
+
+    /* detach object */
+    rt_object_detach(&(mp->parent));
+    rt_spin_unlock_irqrestore(&(mp->spinlock), level);
+
+    return RT_EOK;
+}
+RTM_EXPORT(rt_mp_detach);
+
+#ifdef RT_USING_HEAP
+/**
+ * @brief This function will create a mempool object and allocate the memory pool from
+ *        heap.
+ *
+ * @param name is the name of memory pool.
+ *
+ * @param block_count is the count of blocks in memory pool.
+ *
+ * @param block_size is the size for each block.
+ *
+ * @return the created mempool object
+ */
+rt_mp_t rt_mp_create(const char *name,
+                     rt_size_t   block_count,
+                     rt_size_t   block_size)
+{
+    rt_uint8_t *block_ptr;
+    struct rt_mempool *mp;
+    rt_size_t offset;
+
+    RT_DEBUG_NOT_IN_INTERRUPT;
+
+    /* parameter check */
+    RT_ASSERT(name != RT_NULL);
+    RT_ASSERT(block_count > 0 && block_size > 0);
+
+    /* allocate object */
+    mp = (struct rt_mempool *)rt_object_allocate(RT_Object_Class_MemPool, name);
+    /* allocate object failed */
+    if (mp == RT_NULL)
+        return RT_NULL;
+
+    /* initialize memory pool */
+    block_size     = RT_ALIGN(block_size, RT_ALIGN_SIZE);
+    mp->block_size = block_size;
+    mp->size       = (block_size + sizeof(rt_uint8_t *)) * block_count;
+
+    /* allocate memory */
+    mp->start_address = rt_malloc((block_size + sizeof(rt_uint8_t *)) *
+                                  block_count);
+    if (mp->start_address == RT_NULL)
+    {
+        /* no memory, delete memory pool object */
+        rt_object_delete(&(mp->parent));
+
+        return RT_NULL;
+    }
+
+    mp->block_total_count = block_count;
+    mp->block_free_count  = mp->block_total_count;
+
+    /* initialize suspended thread list */
+    rt_list_init(&(mp->suspend_thread));
+
+    /* initialize free block list */
+    block_ptr = (rt_uint8_t *)mp->start_address;
+    for (offset = 0; offset < mp->block_total_count; offset ++)
+    {
+        *(rt_uint8_t **)(block_ptr + offset * (block_size + sizeof(rt_uint8_t *)))
+            = block_ptr + (offset + 1) * (block_size + sizeof(rt_uint8_t *));
+    }
+
+    *(rt_uint8_t **)(block_ptr + (offset - 1) * (block_size + sizeof(rt_uint8_t *)))
+        = RT_NULL;
+
+    mp->block_list = block_ptr;
+    rt_spin_lock_init(&(mp->spinlock));
+
+    return mp;
+}
+RTM_EXPORT(rt_mp_create);
+
+/**
+ * @brief This function will delete a memory pool and release the object memory.
+ *
+ * @param mp is the memory pool object.
+ *
+ * @return RT_EOK
+ */
+rt_err_t rt_mp_delete(rt_mp_t mp)
+{
+    rt_base_t level;
+
+    RT_DEBUG_NOT_IN_INTERRUPT;
+
+    /* parameter check */
+    RT_ASSERT(mp != RT_NULL);
+    RT_ASSERT(rt_object_get_type(&mp->parent) == RT_Object_Class_MemPool);
+    RT_ASSERT(rt_object_is_systemobject(&mp->parent) == RT_FALSE);
+
+    level = rt_spin_lock_irqsave(&(mp->spinlock));
+    /* wake up all suspended threads */
+    rt_susp_list_resume_all(&mp->suspend_thread, RT_ERROR);
+
+    rt_spin_unlock_irqrestore(&(mp->spinlock), level);
+
+    /* release allocated room */
+    rt_free(mp->start_address);
+
+    /* detach object */
+    rt_object_delete(&(mp->parent));
+
+    return RT_EOK;
+}
+RTM_EXPORT(rt_mp_delete);
+#endif /* RT_USING_HEAP */
+
+/**
+ * @brief This function will allocate a block from memory pool.
+ *
+ * @param mp is the memory pool object.
+ *
+ * @param time is the maximum waiting time for allocating memory.
+ *             - 0 for not waiting, allocating memory immediately.
+ *
+ * @return the allocated memory block or RT_NULL on allocated failed.
+ */
+void *rt_mp_alloc(rt_mp_t mp, rt_int32_t time)
+{
+    rt_uint8_t *block_ptr;
+    rt_base_t level;
+    struct rt_thread *thread;
+    rt_uint32_t before_sleep = 0;
+
+    /* parameter check */
+    RT_ASSERT(mp != RT_NULL);
+
+    /* get current thread */
+    thread = rt_thread_self();
+
+    level = rt_spin_lock_irqsave(&(mp->spinlock));
+
+    while (mp->block_free_count == 0)
+    {
+        /* memory block is unavailable. */
+        if (time == 0)
+        {
+            rt_spin_unlock_irqrestore(&(mp->spinlock), level);
+
+            rt_set_errno(-RT_ETIMEOUT);
+
+            return RT_NULL;
+        }
+
+        RT_DEBUG_NOT_IN_INTERRUPT;
+
+        thread->error = RT_EOK;
+
+        /* need suspend thread */
+        rt_thread_suspend_to_list(thread, &mp->suspend_thread, RT_IPC_FLAG_FIFO, RT_UNINTERRUPTIBLE);
+
+        if (time > 0)
+        {
+            /* get the start tick of timer */
+            before_sleep = rt_tick_get();
+
+            /* init thread timer and start it */
+            rt_timer_control(&(thread->thread_timer),
+                             RT_TIMER_CTRL_SET_TIME,
+                             &time);
+            rt_timer_start(&(thread->thread_timer));
+        }
+
+        /* enable interrupt */
+        rt_spin_unlock_irqrestore(&(mp->spinlock), level);
+
+        /* do a schedule */
+        rt_schedule();
+
+        if (thread->error != RT_EOK)
+            return RT_NULL;
+
+        if (time > 0)
+        {
+            time -= rt_tick_get() - before_sleep;
+            if (time < 0)
+                time = 0;
+        }
+        level = rt_spin_lock_irqsave(&(mp->spinlock));
+    }
+
+    /* memory block is available. decrease the free block counter */
+    mp->block_free_count--;
+
+    /* get block from block list */
+    block_ptr = mp->block_list;
+    RT_ASSERT(block_ptr != RT_NULL);
+
+    /* Setup the next free node. */
+    mp->block_list = *(rt_uint8_t **)block_ptr;
+
+    /* point to memory pool */
+    *(rt_uint8_t **)block_ptr = (rt_uint8_t *)mp;
+
+    rt_spin_unlock_irqrestore(&(mp->spinlock), level);
+
+    RT_OBJECT_HOOK_CALL(rt_mp_alloc_hook,
+                        (mp, (rt_uint8_t *)(block_ptr + sizeof(rt_uint8_t *))));
+
+    return (rt_uint8_t *)(block_ptr + sizeof(rt_uint8_t *));
+}
+RTM_EXPORT(rt_mp_alloc);
+
+/**
+ * @brief This function will release a memory block.
+ *
+ * @param block the address of memory block to be released.
+ */
+void rt_mp_free(void *block)
+{
+    rt_uint8_t **block_ptr;
+    struct rt_mempool *mp;
+    rt_base_t level;
+
+    /* parameter check */
+    if (block == RT_NULL) return;
+
+    /* get the control block of pool which the block belongs to */
+    block_ptr = (rt_uint8_t **)((rt_uint8_t *)block - sizeof(rt_uint8_t *));
+    mp        = (struct rt_mempool *)*block_ptr;
+
+    RT_OBJECT_HOOK_CALL(rt_mp_free_hook, (mp, block));
+
+    level = rt_spin_lock_irqsave(&(mp->spinlock));
+
+    /* increase the free block count */
+    mp->block_free_count ++;
+
+    /* link the block into the block list */
+    *block_ptr = mp->block_list;
+    mp->block_list = (rt_uint8_t *)block_ptr;
+
+    if (rt_susp_list_dequeue(&mp->suspend_thread, RT_EOK))
+    {
+        rt_spin_unlock_irqrestore(&(mp->spinlock), level);
+
+        /* do a schedule */
+        rt_schedule();
+
+        return;
+    }
+    rt_spin_unlock_irqrestore(&(mp->spinlock), level);
+}
+RTM_EXPORT(rt_mp_free);
+
+/**@}*/
+
+#endif /* RT_USING_MEMPOOL */

rt-thread/src/object.c

@@ -0,0 +1,818 @@
+/*
+ * Copyright (c) 2006-2025, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2006-03-14     Bernard      the first version
+ * 2006-04-21     Bernard      change the scheduler lock to interrupt lock
+ * 2006-05-18     Bernard      fix the object init bug
+ * 2006-08-03     Bernard      add hook support
+ * 2007-01-28     Bernard      rename RT_OBJECT_Class_Static to RT_Object_Class_Static
+ * 2010-10-26     yi.qiu       add module support in rt_object_allocate and rt_object_free
+ * 2017-12-10     Bernard      Add object_info enum.
+ * 2018-01-25     Bernard      Fix the object find issue when enable MODULE.
+ * 2022-01-07     Gabriel      Moving __on_rt_xxxxx_hook to object.c
+ * 2023-09-15     xqyjlj       perf rt_hw_interrupt_disable/enable
+ * 2023-11-17     xqyjlj       add process group and session support
+ */
+
+#include <rtthread.h>
+#include <rthw.h>
+
+#ifdef RT_USING_MODULE
+#include <dlmodule.h>
+#endif /* RT_USING_MODULE */
+
+#ifdef RT_USING_SMART
+#include <lwp.h>
+#endif
+
+#define DBG_TAG           "kernel.obj"
+#define DBG_LVL           DBG_ERROR
+#include <rtdbg.h>
+
+struct rt_custom_object
+{
+    struct rt_object parent;
+    rt_err_t (*destroy)(void *);
+    void *data;
+};
+
+/*
+ * define object_info for the number of _object_container items.
+ */
+enum rt_object_info_type
+{
+    RT_Object_Info_Thread = 0,                         /**< The object is a thread. */
+#ifdef RT_USING_SEMAPHORE
+    RT_Object_Info_Semaphore,                          /**< The object is a semaphore. */
+#endif
+#ifdef RT_USING_MUTEX
+    RT_Object_Info_Mutex,                              /**< The object is a mutex. */
+#endif
+#ifdef RT_USING_EVENT
+    RT_Object_Info_Event,                              /**< The object is a event. */
+#endif
+#ifdef RT_USING_MAILBOX
+    RT_Object_Info_MailBox,                            /**< The object is a mail box. */
+#endif
+#ifdef RT_USING_MESSAGEQUEUE
+    RT_Object_Info_MessageQueue,                       /**< The object is a message queue. */
+#endif
+#ifdef RT_USING_MEMHEAP
+    RT_Object_Info_MemHeap,                            /**< The object is a memory heap */
+#endif
+#ifdef RT_USING_MEMPOOL
+    RT_Object_Info_MemPool,                            /**< The object is a memory pool. */
+#endif
+#ifdef RT_USING_DEVICE
+    RT_Object_Info_Device,                             /**< The object is a device */
+#endif
+    RT_Object_Info_Timer,                              /**< The object is a timer. */
+#ifdef RT_USING_MODULE
+    RT_Object_Info_Module,                             /**< The object is a module. */
+#endif
+#ifdef RT_USING_HEAP
+    RT_Object_Info_Memory,                             /**< The object is a memory. */
+#endif
+#ifdef RT_USING_SMART
+    RT_Object_Info_Channel,                            /**< The object is a IPC channel */
+    RT_Object_Info_ProcessGroup,                       /**< The object is a process group */
+    RT_Object_Info_Session,                            /**< The object is a session */
+#endif
+#ifdef RT_USING_HEAP
+    RT_Object_Info_Custom,                             /**< The object is a custom object */
+#endif
+    RT_Object_Info_Unknown,                            /**< The object is unknown. */
+};
+
+#define _OBJ_CONTAINER_LIST_INIT(c)     \
+    {&(_object_container[c].object_list), &(_object_container[c].object_list)}
+
+static struct rt_object_information _object_container[RT_Object_Info_Unknown] =
+{
+    /* initialize object container - thread */
+    {RT_Object_Class_Thread, _OBJ_CONTAINER_LIST_INIT(RT_Object_Info_Thread), sizeof(struct rt_thread), RT_SPINLOCK_INIT},
+#ifdef RT_USING_SEMAPHORE
+    /* initialize object container - semaphore */
+    {RT_Object_Class_Semaphore, _OBJ_CONTAINER_LIST_INIT(RT_Object_Info_Semaphore), sizeof(struct rt_semaphore), RT_SPINLOCK_INIT},
+#endif
+#ifdef RT_USING_MUTEX
+    /* initialize object container - mutex */
+    {RT_Object_Class_Mutex, _OBJ_CONTAINER_LIST_INIT(RT_Object_Info_Mutex), sizeof(struct rt_mutex), RT_SPINLOCK_INIT},
+#endif
+#ifdef RT_USING_EVENT
+    /* initialize object container - event */
+    {RT_Object_Class_Event, _OBJ_CONTAINER_LIST_INIT(RT_Object_Info_Event), sizeof(struct rt_event), RT_SPINLOCK_INIT},
+#endif
+#ifdef RT_USING_MAILBOX
+    /* initialize object container - mailbox */
+    {RT_Object_Class_MailBox, _OBJ_CONTAINER_LIST_INIT(RT_Object_Info_MailBox), sizeof(struct rt_mailbox), RT_SPINLOCK_INIT},
+#endif
+#ifdef RT_USING_MESSAGEQUEUE
+    /* initialize object container - message queue */
+    {RT_Object_Class_MessageQueue, _OBJ_CONTAINER_LIST_INIT(RT_Object_Info_MessageQueue), sizeof(struct rt_messagequeue), RT_SPINLOCK_INIT},
+#endif
+#ifdef RT_USING_MEMHEAP
+    /* initialize object container - memory heap */
+    {RT_Object_Class_MemHeap, _OBJ_CONTAINER_LIST_INIT(RT_Object_Info_MemHeap), sizeof(struct rt_memheap), RT_SPINLOCK_INIT},
+#endif
+#ifdef RT_USING_MEMPOOL
+    /* initialize object container - memory pool */
+    {RT_Object_Class_MemPool, _OBJ_CONTAINER_LIST_INIT(RT_Object_Info_MemPool), sizeof(struct rt_mempool), RT_SPINLOCK_INIT},
+#endif
+#ifdef RT_USING_DEVICE
+    /* initialize object container - device */
+    {RT_Object_Class_Device, _OBJ_CONTAINER_LIST_INIT(RT_Object_Info_Device), sizeof(struct rt_device), RT_SPINLOCK_INIT},
+#endif
+    /* initialize object container - timer */
+    {RT_Object_Class_Timer, _OBJ_CONTAINER_LIST_INIT(RT_Object_Info_Timer), sizeof(struct rt_timer), RT_SPINLOCK_INIT},
+#ifdef RT_USING_MODULE
+    /* initialize object container - module */
+    {RT_Object_Class_Module, _OBJ_CONTAINER_LIST_INIT(RT_Object_Info_Module), sizeof(struct rt_dlmodule), RT_SPINLOCK_INIT},
+#endif
+#ifdef RT_USING_HEAP
+    /* initialize object container - small memory */
+    {RT_Object_Class_Memory, _OBJ_CONTAINER_LIST_INIT(RT_Object_Info_Memory), sizeof(struct rt_memory), RT_SPINLOCK_INIT},
+#endif
+#ifdef RT_USING_SMART
+    /* initialize object container - module */
+    {RT_Object_Class_Channel, _OBJ_CONTAINER_LIST_INIT(RT_Object_Info_Channel), sizeof(struct rt_channel), RT_SPINLOCK_INIT},
+    {RT_Object_Class_ProcessGroup, _OBJ_CONTAINER_LIST_INIT(RT_Object_Info_ProcessGroup), sizeof(struct rt_processgroup), RT_SPINLOCK_INIT},
+    {RT_Object_Class_Session, _OBJ_CONTAINER_LIST_INIT(RT_Object_Info_Session), sizeof(struct rt_session), RT_SPINLOCK_INIT},
+#endif
+#ifdef RT_USING_HEAP
+    {RT_Object_Class_Custom, _OBJ_CONTAINER_LIST_INIT(RT_Object_Info_Custom), sizeof(struct rt_custom_object), RT_SPINLOCK_INIT},
+#endif
+};
+
+#if defined(RT_USING_HOOK) && defined(RT_HOOK_USING_FUNC_PTR)
+static void (*rt_object_attach_hook)(struct rt_object *object);
+static void (*rt_object_detach_hook)(struct rt_object *object);
+void (*rt_object_trytake_hook)(struct rt_object *object);
+void (*rt_object_take_hook)(struct rt_object *object);
+void (*rt_object_put_hook)(struct rt_object *object);
+
+/**
+ * @addtogroup group_hook
+ */
+
+/**@{*/
+
+/**
+ * @brief This function will set a hook function, which will be invoked when object
+ *        attaches to kernel object system.
+ *
+ * @param hook is the hook function.
+ */
+void rt_object_attach_sethook(void (*hook)(struct rt_object *object))
+{
+    rt_object_attach_hook = hook;
+}
+
+/**
+ * @brief This function will set a hook function, which will be invoked when object
+ *        detaches from kernel object system.
+ *
+ * @param hook is the hook function
+ */
+void rt_object_detach_sethook(void (*hook)(struct rt_object *object))
+{
+    rt_object_detach_hook = hook;
+}
+
+/**
+ * @brief This function will set a hook function, which will be invoked when object
+ *        is taken from kernel object system.
+ *
+ *        The object is taken means:
+ *            semaphore - semaphore is taken by thread
+ *            mutex - mutex is taken by thread
+ *            event - event is received by thread
+ *            mailbox - mail is received by thread
+ *            message queue - message is received by thread
+ *
+ * @param hook is the hook function.
+ */
+void rt_object_trytake_sethook(void (*hook)(struct rt_object *object))
+{
+    rt_object_trytake_hook = hook;
+}
+
+/**
+ * @brief This function will set a hook function, which will be invoked when object
+ *        have been taken from kernel object system.
+ *
+ *        The object have been taken means:
+ *            semaphore - semaphore have been taken by thread
+ *            mutex - mutex have been taken by thread
+ *            event - event have been received by thread
+ *            mailbox - mail have been received by thread
+ *            message queue - message have been received by thread
+ *            timer - timer is started
+ *
+ * @param hook the hook function.
+ */
+void rt_object_take_sethook(void (*hook)(struct rt_object *object))
+{
+    rt_object_take_hook = hook;
+}
+
+/**
+ * @brief This function will set a hook function, which will be invoked when object
+ *        is put to kernel object system.
+ *
+ * @param hook is the hook function
+ */
+void rt_object_put_sethook(void (*hook)(struct rt_object *object))
+{
+    rt_object_put_hook = hook;
+}
+
+/**@}*/
+#endif /* RT_USING_HOOK */
+
+/**
+ * @addtogroup group_object_management
+ */
+
+/**@{*/
+
+/**
+ * @brief This function will return the specified type of object information.
+ *
+ * @param type is the type of object, which can be
+ *             RT_Object_Class_Thread/Semaphore/Mutex... etc
+ *
+ * @return the object type information or RT_NULL
+ */
+struct rt_object_information *
+rt_object_get_information(enum rt_object_class_type type)
+{
+    int index;
+
+    type = (enum rt_object_class_type)(type & ~RT_Object_Class_Static);
+
+    for (index = 0; index < RT_Object_Info_Unknown; index ++)
+        if (_object_container[index].type == type) return &_object_container[index];
+
+    return RT_NULL;
+}
+RTM_EXPORT(rt_object_get_information);
+
+/**
+ * @brief This function will return the length of object list in object container.
+ *
+ * @param type is the type of object, which can be
+ *             RT_Object_Class_Thread/Semaphore/Mutex... etc
+ *
+ * @return the length of object list
+ */
+int rt_object_get_length(enum rt_object_class_type type)
+{
+    int count = 0;
+    rt_base_t level;
+    struct rt_list_node *node = RT_NULL;
+    struct rt_object_information *information = RT_NULL;
+
+    information = rt_object_get_information((enum rt_object_class_type)type);
+    if (information == RT_NULL) return 0;
+
+    level = rt_spin_lock_irqsave(&(information->spinlock));
+    rt_list_for_each(node, &(information->object_list))
+    {
+        count ++;
+    }
+    rt_spin_unlock_irqrestore(&(information->spinlock), level);
+
+    return count;
+}
+RTM_EXPORT(rt_object_get_length);
+
+/**
+ * @brief This function will copy the object pointer of the specified type,
+ *        with the maximum size specified by maxlen.
+ *
+ * @param type is the type of object, which can be
+ *             RT_Object_Class_Thread/Semaphore/Mutex... etc
+ *
+ * @param pointers is the pointer will be saved to.
+ *
+ * @param maxlen is the maximum number of pointers can be saved.
+ *
+ * @return the copied number of object pointers.
+ */
+int rt_object_get_pointers(enum rt_object_class_type type, rt_object_t *pointers, int maxlen)
+{
+    int index = 0;
+    rt_base_t level;
+
+    struct rt_object *object;
+    struct rt_list_node *node = RT_NULL;
+    struct rt_object_information *information = RT_NULL;
+
+    if (maxlen <= 0) return 0;
+
+    information = rt_object_get_information(type);
+    if (information == RT_NULL) return 0;
+
+    level = rt_spin_lock_irqsave(&(information->spinlock));
+    /* retrieve pointer of object */
+    rt_list_for_each(node, &(information->object_list))
+    {
+        object = rt_list_entry(node, struct rt_object, list);
+
+        pointers[index] = object;
+        index ++;
+
+        if (index >= maxlen) break;
+    }
+    rt_spin_unlock_irqrestore(&(information->spinlock), level);
+
+    return index;
+}
+RTM_EXPORT(rt_object_get_pointers);
+
+/**
+ * @brief This function will initialize an object and add it to object system
+ *        management.
+ *
+ * @param object The specified object to be initialized.
+ *               The object pointer that needs to be initialized must point to
+ *               a specific object memory block, not a null pointer or a wild pointer.
+ *
+ * @param type The object type. The type of the object must be a enumeration
+ *             type listed in rt_object_class_type, RT_Object_Class_Static
+ *             excluded. (For static objects, or objects initialized with the
+ *             rt_object_init interface, the system identifies it as an
+ *             RT_Object_Class_Static type)
+ *
+ * @param name Name of the object. In system, the object's name must be unique.
+ *             Each object can be set to a name, and the maximum length for the
+ *             name is specified by RT_NAME_MAX. The system does not care if it
+ *             uses '\0' as a terminal symbol.
+ */
+void rt_object_init(struct rt_object         *object,
+                    enum rt_object_class_type type,
+                    const char               *name)
+{
+    rt_base_t level;
+    rt_size_t obj_name_len;
+#ifdef RT_DEBUGING_ASSERT
+    struct rt_list_node *node = RT_NULL;
+#endif /* RT_DEBUGING_ASSERT */
+    struct rt_object_information *information;
+#ifdef RT_USING_MODULE
+    struct rt_dlmodule *module = dlmodule_self();
+#endif /* RT_USING_MODULE */
+
+    /* get object information */
+    information = rt_object_get_information(type);
+    RT_ASSERT(information != RT_NULL);
+
+#ifdef RT_DEBUGING_ASSERT
+    /* check object type to avoid re-initialization */
+
+    /* enter critical */
+    level = rt_spin_lock_irqsave(&(information->spinlock));
+    /* try to find object */
+    for (node  = information->object_list.next;
+            node != &(information->object_list);
+            node  = node->next)
+    {
+        struct rt_object *obj;
+
+        obj = rt_list_entry(node, struct rt_object, list);
+        RT_ASSERT(obj != object);
+    }
+    /* leave critical */
+    rt_spin_unlock_irqrestore(&(information->spinlock), level);
+#endif /* RT_DEBUGING_ASSERT */
+
+    /* initialize object's parameters */
+    /* set object type to static */
+    object->type = type | RT_Object_Class_Static;
+#if RT_NAME_MAX > 0
+    if (name)
+    {
+        obj_name_len = rt_strlen(name);
+        if(obj_name_len > RT_NAME_MAX - 1)
+        {
+            LOG_E("Object name %s exceeds RT_NAME_MAX=%d, consider increasing RT_NAME_MAX.", name, RT_NAME_MAX);
+            RT_ASSERT(obj_name_len <= RT_NAME_MAX - 1);
+        }
+        rt_memcpy(object->name, name, obj_name_len);
+        object->name[obj_name_len] = '\0';
+    }
+    else
+    {
+        object->name[0] = '\0';
+    }
+#else
+    object->name = name;
+#endif
+
+    RT_OBJECT_HOOK_CALL(rt_object_attach_hook, (object));
+
+    level = rt_spin_lock_irqsave(&(information->spinlock));
+
+#ifdef RT_USING_MODULE
+    if (module)
+    {
+        rt_list_insert_after(&(module->object_list), &(object->list));
+        object->module_id = (void *)module;
+    }
+    else
+#endif /* RT_USING_MODULE */
+    {
+        /* insert object into information object list */
+        rt_list_insert_after(&(information->object_list), &(object->list));
+    }
+    rt_spin_unlock_irqrestore(&(information->spinlock), level);
+}
+
+/**
+ * @brief This function will detach a static object from object system,
+ *        and the memory of static object is not freed.
+ *
+ * @param object the specified object to be detached.
+ */
+void rt_object_detach(rt_object_t object)
+{
+    rt_base_t level;
+    struct rt_object_information *information;
+
+    /* object check */
+    RT_ASSERT(object != RT_NULL);
+
+    RT_OBJECT_HOOK_CALL(rt_object_detach_hook, (object));
+
+    information = rt_object_get_information((enum rt_object_class_type)object->type);
+    RT_ASSERT(information != RT_NULL);
+
+    level = rt_spin_lock_irqsave(&(information->spinlock));
+    /* remove from old list */
+    rt_list_remove(&(object->list));
+    rt_spin_unlock_irqrestore(&(information->spinlock), level);
+
+    object->type = RT_Object_Class_Null;
+}
+
+#ifdef RT_USING_HEAP
+/**
+ * @brief This function will allocate an object from object system.
+ *
+ * @param type Type of object. The type of the allocated object can only be of
+ *             type rt_object_class_type other than RT_Object_Class_Static.
+ *             In addition, the type of object allocated through this interface
+ *             is dynamic, not static.
+ *
+ * @param name Name of the object. In system, the object's name must be unique.
+ *             Each object can be set to a name, and the maximum length for the
+ *             name is specified by RT_NAME_MAX. The system does not care if it
+ *             uses '\0' as a terminal symbol.
+ *
+ * @return object handle allocated successfully, or RT_NULL if no memory can be allocated.
+ */
+rt_object_t rt_object_allocate(enum rt_object_class_type type, const char *name)
+{
+    struct rt_object *object;
+    rt_base_t level;
+    rt_size_t obj_name_len;
+    struct rt_object_information *information;
+#ifdef RT_USING_MODULE
+    struct rt_dlmodule *module = dlmodule_self();
+#endif /* RT_USING_MODULE */
+
+    RT_DEBUG_NOT_IN_INTERRUPT;
+
+    /* get object information */
+    information = rt_object_get_information(type);
+    RT_ASSERT(information != RT_NULL);
+
+    object = (struct rt_object *)RT_KERNEL_MALLOC(information->object_size);
+    if (object == RT_NULL)
+    {
+        /* no memory can be allocated */
+        return RT_NULL;
+    }
+
+    /* clean memory data of object */
+    rt_memset(object, 0x0, information->object_size);
+
+    /* initialize object's parameters */
+
+    /* set object type */
+    object->type = type;
+
+    /* set object flag */
+    object->flag = 0;
+
+#if RT_NAME_MAX > 0
+    if (name)
+    {
+        obj_name_len = rt_strlen(name);
+        if(obj_name_len > RT_NAME_MAX - 1)
+        {
+            LOG_E("Object name '%s' exceeds RT_NAME_MAX=%d, consider increasing RT_NAME_MAX.", name, RT_NAME_MAX);
+            RT_ASSERT(obj_name_len <= RT_NAME_MAX - 1);
+        }
+        rt_memcpy(object->name, name, obj_name_len);
+        object->name[obj_name_len] = '\0';
+    }
+    else
+    {
+        object->name[0] = '\0';
+    }
+#else
+    object->name = name;
+#endif
+
+    RT_OBJECT_HOOK_CALL(rt_object_attach_hook, (object));
+
+    level = rt_spin_lock_irqsave(&(information->spinlock));
+
+#ifdef RT_USING_MODULE
+    if (module)
+    {
+        rt_list_insert_after(&(module->object_list), &(object->list));
+        object->module_id = (void *)module;
+    }
+    else
+#endif /* RT_USING_MODULE */
+    {
+        /* insert object into information object list */
+        rt_list_insert_after(&(information->object_list), &(object->list));
+    }
+    rt_spin_unlock_irqrestore(&(information->spinlock), level);
+
+    return object;
+}
+
+/**
+ * @brief This function will delete an object and release object memory.
+ *
+ * @param object The specified object to be deleted.
+ */
+void rt_object_delete(rt_object_t object)
+{
+    rt_base_t level;
+    struct rt_object_information *information;
+
+    /* object check */
+    RT_ASSERT(object != RT_NULL);
+    RT_ASSERT(!(object->type & RT_Object_Class_Static));
+
+    RT_OBJECT_HOOK_CALL(rt_object_detach_hook, (object));
+
+
+    information = rt_object_get_information((enum rt_object_class_type)object->type);
+    RT_ASSERT(information != RT_NULL);
+
+    level = rt_spin_lock_irqsave(&(information->spinlock));
+
+    /* remove from old list */
+    rt_list_remove(&(object->list));
+
+    rt_spin_unlock_irqrestore(&(information->spinlock), level);
+
+    /* reset object type */
+    object->type = RT_Object_Class_Null;
+
+    /* free the memory of object */
+    RT_KERNEL_FREE(object);
+}
+#endif /* RT_USING_HEAP */
+
+/**
+ * @brief This function will judge the object is system object or not.
+ *
+ * @note  Normally, the system object is a static object and the type
+ *        of object set to RT_Object_Class_Static.
+ *
+ * @param object The specified object to be judged.
+ *
+ * @return RT_TRUE if a system object, RT_FALSE for others.
+ */
+rt_bool_t rt_object_is_systemobject(rt_object_t object)
+{
+    /* object check */
+    RT_ASSERT(object != RT_NULL);
+
+    if (object->type & RT_Object_Class_Static)
+        return RT_TRUE;
+
+    return RT_FALSE;
+}
+
+/**
+ * @brief This function will return the type of object without
+ *        RT_Object_Class_Static flag.
+ *
+ * @param object is the specified object to be get type.
+ *
+ * @return the type of object.
+ */
+rt_uint8_t rt_object_get_type(rt_object_t object)
+{
+    /* object check */
+    RT_ASSERT(object != RT_NULL);
+
+    return object->type & ~RT_Object_Class_Static;
+}
+
+/**
+ * @brief This function will iterate through each object from object
+ *        container.
+ *
+ * @param type is the type of object
+ * @param iter is the iterator
+ * @param data is the specified data passed to iterator
+ *
+ * @return RT_EOK on succeed, otherwise the error from `iter`
+ *
+ * @note this function shall not be invoked in interrupt status.
+ */
+rt_err_t rt_object_for_each(rt_uint8_t type, rt_object_iter_t iter, void *data)
+{
+    struct rt_object *object = RT_NULL;
+    struct rt_list_node *node = RT_NULL;
+    struct rt_object_information *information = RT_NULL;
+    rt_base_t level;
+    rt_err_t error;
+
+    information = rt_object_get_information((enum rt_object_class_type)type);
+
+    /* parameter check */
+    if (information == RT_NULL)
+    {
+        return -RT_EINVAL;
+    }
+
+    /* which is invoke in interrupt status */
+    RT_DEBUG_NOT_IN_INTERRUPT;
+
+    /* enter critical */
+    level = rt_spin_lock_irqsave(&(information->spinlock));
+
+    /* try to find object */
+    rt_list_for_each(node, &(information->object_list))
+    {
+        object = rt_list_entry(node, struct rt_object, list);
+        if ((error = iter(object, data)) != RT_EOK)
+        {
+            rt_spin_unlock_irqrestore(&(information->spinlock), level);
+
+            return error >= 0 ? RT_EOK : error;
+        }
+    }
+
+    rt_spin_unlock_irqrestore(&(information->spinlock), level);
+
+    return RT_EOK;
+}
+
+struct _obj_find_param
+{
+    const char *match_name;
+    rt_object_t matched_obj;
+};
+
+static rt_err_t _match_name(struct rt_object *obj, void *data)
+{
+    struct _obj_find_param *param = data;
+    const char *name = param->match_name;
+    char truncated_name[RT_NAME_MAX];
+
+    /* Truncate input name to RT_NAME_MAX - 1 to match object name storage */
+    rt_strncpy(truncated_name, name, RT_NAME_MAX - 1);
+    truncated_name[RT_NAME_MAX - 1] = '\0';
+
+    if (rt_strcmp(obj->name, truncated_name) == 0)
+    {
+        param->matched_obj = obj;
+
+        /* notify an early break of loop, but not on error */
+        return 1;
+    }
+
+    return RT_EOK;
+}
+
+/**
+ * @brief This function will find specified name object from object
+ *        container.
+ *
+ * @param name is the specified name of object.
+ *
+ * @param type is the type of object
+ *
+ * @return the found object or RT_NULL if there is no this object
+ * in object container.
+ *
+ * @note this function shall not be invoked in interrupt status.
+ */
+rt_object_t rt_object_find(const char *name, rt_uint8_t type)
+{
+    struct _obj_find_param param =
+    {
+        .match_name = name,
+        .matched_obj = RT_NULL,
+    };
+
+    /* parameter check */
+    if (name == RT_NULL || rt_object_get_information(type) == RT_NULL)
+        return RT_NULL;
+
+    /* which is invoke in interrupt status */
+    RT_DEBUG_NOT_IN_INTERRUPT;
+
+    rt_object_for_each(type, _match_name, &param);
+    return param.matched_obj;
+}
+
+/**
+ * @brief This function will return the name of the specified object container
+ *
+ * @param object    the specified object to be get name
+ * @param name      buffer to store the object name string
+ * @param name_size  maximum size of the buffer to store object name
+ *
+ * @return -RT_EINVAL if any parameter is invalid or RT_EOK if the operation is successfully executed
+ *
+ * @note this function shall not be invoked in interrupt status
+ */
+rt_err_t rt_object_get_name(rt_object_t object, char *name, rt_uint8_t name_size)
+{
+    rt_err_t result = -RT_EINVAL;
+    if ((object != RT_NULL) && (name != RT_NULL) && (name_size != 0U))
+    {
+        const char *obj_name = object->name;
+        rt_strncpy(name, obj_name, (rt_size_t)name_size);
+        /* Ensure null-termination */
+        name[name_size - 1] = '\0';
+        result = RT_EOK;
+    }
+
+    return result;
+}
+
+#ifdef RT_USING_HEAP
+/**
+ * This function will create a custom object
+ * container.
+ *
+ * @param name the specified name of object.
+ * @param data the custom data
+ * @param data_destroy the custom object destroy callback
+ *
+ * @return the found object or RT_NULL if there is no this object
+ * in object container.
+ *
+ * @note this function shall not be invoked in interrupt status.
+ */
+
+rt_object_t rt_custom_object_create(const char *name, void *data, rt_err_t (*data_destroy)(void *))
+{
+    struct rt_custom_object *cobj = RT_NULL;
+
+    cobj = (struct rt_custom_object *)rt_object_allocate(RT_Object_Class_Custom, name);
+    if (!cobj)
+    {
+        return RT_NULL;
+    }
+    cobj->destroy = data_destroy;
+    cobj->data = data;
+    return (struct rt_object *)cobj;
+}
+
+/**
+ * This function will destroy a custom object
+ * container.
+ *
+ * @param obj the specified name of object.
+ *
+ * @note this function shall not be invoked in interrupt status.
+ */
+rt_err_t rt_custom_object_destroy(rt_object_t obj)
+{
+    rt_err_t ret = -1;
+
+    struct rt_custom_object *cobj = (struct rt_custom_object *)obj;
+
+    if (obj && obj->type == RT_Object_Class_Custom)
+    {
+        if (cobj->destroy)
+        {
+            ret = cobj->destroy(cobj->data);
+        }
+        rt_object_delete(obj);
+    }
+    return ret;
+}
+#endif
+
+/**@}*/
+

rt-thread/src/scheduler_comm.c

@@ -0,0 +1,484 @@
+/*
+ * Copyright (c) 2006-2025 RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * (scheduler_comm.c) Common API of scheduling routines.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2024-01-18     Shell        Separate scheduling related codes from thread.c, scheduler_.*
+ */
+
+#define DBG_TAG           "kernel.sched"
+#define DBG_LVL           DBG_INFO
+#include <rtdbg.h>
+
+#include <rtthread.h>
+
+/**
+ * @brief Initialize thread scheduling context
+ *
+ * @param thread The thread to be initialized
+ * @param tick Initial time slice value for the thread
+ * @param priority Initial priority of the thread
+ *
+ * @details This function performs the following initialization:
+ *   - Sets thread status to INIT
+ *   - For SMP systems:
+ *     * Sets bind CPU to none (RT_CPUS_NR)
+ *     * Marks CPU as detached (RT_CPU_DETACHED)
+ *   - Calls rt_sched_thread_init_priv() for private scheduling data initialization
+ */
+void rt_sched_thread_init_ctx(struct rt_thread *thread, rt_uint32_t tick, rt_uint8_t priority)
+{
+    /* setup thread status */
+    RT_SCHED_CTX(thread).stat  = RT_THREAD_INIT;
+
+#ifdef RT_USING_SMP
+    /* not bind on any cpu */
+    RT_SCHED_CTX(thread).bind_cpu = RT_CPUS_NR;
+    RT_SCHED_CTX(thread).oncpu = RT_CPU_DETACHED;
+#endif /* RT_USING_SMP */
+
+    rt_sched_thread_init_priv(thread, tick, priority);
+}
+
+/**
+ * @brief Start the thread timer for scheduling
+ *
+ * @param thread The thread whose timer needs to be started
+ *
+ * @return rt_err_t Always returns RT_EOK on success
+ *
+ * @details This function:
+ *   - Requires scheduler lock to be held.
+ *   - Sets the thread's timer flag (sched_flag_ttmr_set) to indicate timer is active
+ */
+rt_err_t rt_sched_thread_timer_start(struct rt_thread *thread)
+{
+    RT_SCHED_DEBUG_IS_LOCKED;
+    RT_SCHED_CTX(thread).sched_flag_ttmr_set = 1;
+    return RT_EOK;
+}
+
+/**
+ * @brief Stop the thread timer for scheduling
+ *
+ * @param thread The thread whose timer needs to be stopped
+ *
+ * @return rt_err_t
+ *   - RT_EOK if timer was successfully stopped or not active
+ *   - Other error codes from rt_timer_stop() if stop operation failed
+ */
+rt_err_t rt_sched_thread_timer_stop(struct rt_thread *thread)
+{
+    rt_err_t error;
+    RT_SCHED_DEBUG_IS_LOCKED;
+
+    if (RT_SCHED_CTX(thread).sched_flag_ttmr_set)
+    {
+        error = rt_timer_stop(&thread->thread_timer);
+
+        /* mask out timer flag no matter stop success or not */
+        RT_SCHED_CTX(thread).sched_flag_ttmr_set = 0;
+    }
+    else
+    {
+        error = RT_EOK;
+    }
+    return error;
+}
+
+/**
+ * @brief Get the current status of a thread
+ *
+ * @param thread The thread to get status from
+ *
+ * @return rt_uint8_t The thread status masked with RT_THREAD_STAT_MASK
+ *
+ * @details This function:
+ *   - Requires scheduler lock to be held (RT_SCHED_DEBUG_IS_LOCKED)
+ *   - Returns the thread's status field masked with RT_THREAD_STAT_MASK
+ */
+rt_uint8_t rt_sched_thread_get_stat(struct rt_thread *thread)
+{
+    RT_SCHED_DEBUG_IS_LOCKED;
+    return RT_SCHED_CTX(thread).stat & RT_THREAD_STAT_MASK;
+}
+
+/**
+ * @brief Get the current priority of a thread
+ *
+ * @param thread The thread to get priority from
+ *
+ * @return rt_uint8_t The current priority value of the thread
+ *
+ * @details This function:
+ *   - Requires scheduler lock to be held (RT_SCHED_DEBUG_IS_LOCKED)
+ *   - Returns the thread's current priority field from its private scheduling data
+ */
+rt_uint8_t rt_sched_thread_get_curr_prio(struct rt_thread *thread)
+{
+    RT_SCHED_DEBUG_IS_LOCKED;
+    return RT_SCHED_PRIV(thread).current_priority;
+}
+
+/**
+ * @brief Get the initial priority of a thread
+ *
+ * @param thread The thread to get priority from
+ *
+ * @return rt_uint8_t The initial priority value of the thread
+ *
+ * @details This function:
+ *   - Returns the thread's initial priority field from its private scheduling data
+ *   - Does not require scheduler lock as it accesses read-only fields
+ */
+rt_uint8_t rt_sched_thread_get_init_prio(struct rt_thread *thread)
+{
+    /* read only fields, so lock is unnecessary */
+    return RT_SCHED_PRIV(thread).init_priority;
+}
+
+/**
+ * @brief Check if a thread is in suspended state
+ *
+ * @param thread The thread to check
+ *
+ * @return rt_uint8_t
+ *   - 1 if thread is suspended (matches RT_THREAD_SUSPEND_MASK)
+ *   - 0 otherwise
+ *
+ * @details This function:
+ *   - Requires scheduler lock to be held (RT_SCHED_DEBUG_IS_LOCKED)
+ *   - Checks thread's status field against RT_THREAD_SUSPEND_MASK
+ *
+ * @note Caller must hold the scheduler lock before calling this function
+ */
+rt_uint8_t rt_sched_thread_is_suspended(struct rt_thread *thread)
+{
+    RT_SCHED_DEBUG_IS_LOCKED;
+    return (RT_SCHED_CTX(thread).stat & RT_THREAD_SUSPEND_MASK) == RT_THREAD_SUSPEND_MASK;
+}
+
+/**
+ * @brief Close a thread by setting its status to CLOSED
+ *
+ * @param thread The thread to be closed
+ * @return rt_err_t Always returns RT_EOK on success
+ *
+ * @details This function:
+ *   - Requires scheduler lock to be held (RT_SCHED_DEBUG_IS_LOCKED)
+ *   - Sets the thread's status to RT_THREAD_CLOSE
+ *
+ * @note Must be called with scheduler lock held
+ */
+rt_err_t rt_sched_thread_close(struct rt_thread *thread)
+{
+    RT_SCHED_DEBUG_IS_LOCKED;
+    RT_SCHED_CTX(thread).stat = RT_THREAD_CLOSE;
+    return RT_EOK;
+}
+
+/**
+ * @brief Yield the current thread's remaining time slice
+ *
+ * @param thread The thread to yield
+ * @return rt_err_t Always returns RT_EOK on success
+ *
+ * @details This function:
+ *   - Requires scheduler lock to be held (RT_SCHED_DEBUG_IS_LOCKED)
+ *   - Resets the thread's remaining tick count to its initial value
+ *   - Sets the thread's status to YIELD state
+ *
+ * @note Must be called with scheduler lock held
+ */
+rt_err_t rt_sched_thread_yield(struct rt_thread *thread)
+{
+    RT_SCHED_DEBUG_IS_LOCKED;
+
+    RT_SCHED_PRIV(thread).remaining_tick = RT_SCHED_PRIV(thread).init_tick;
+    RT_SCHED_CTX(thread).stat |= RT_THREAD_STAT_YIELD;
+
+    return RT_EOK;
+}
+
+/**
+ * @brief Make a suspended thread ready for scheduling
+ *
+ * @param thread The thread to be made ready
+ *
+ * @return rt_err_t
+ *   - RT_EOK if operation succeeded
+ *   - -RT_EINVAL if thread is not suspended
+ *   - Other error codes from rt_sched_thread_timer_stop() if timer stop failed
+ *
+ * @details This function:
+ *   - Requires scheduler lock to be held (RT_SCHED_DEBUG_IS_LOCKED)
+ *   - Checks if thread is suspended (returns -RT_EINVAL if not)
+ *   - Stops thread timer if active
+ *   - Removes thread from suspend list
+ *   - Clears wakeup handler (if RT_USING_SMART is defined)
+ *   - Inserts thread into ready queue
+ *
+ * @note Must be called with scheduler lock held
+ *       May fail due to racing conditions with timeout ISR
+ */
+rt_err_t rt_sched_thread_ready(struct rt_thread *thread)
+{
+    rt_err_t error;
+
+    RT_SCHED_DEBUG_IS_LOCKED;
+
+    if (!rt_sched_thread_is_suspended(thread))
+    {
+        /* failed to proceed, and that's possibly due to a racing condition */
+        error = -RT_EINVAL;
+    }
+    else
+    {
+        if (RT_SCHED_CTX(thread).sched_flag_ttmr_set)
+        {
+            /**
+             * Quiet timeout timer first if set. and don't continue if we
+             * failed, because it probably means that a timeout ISR racing to
+             * resume thread before us.
+             */
+            error = rt_sched_thread_timer_stop(thread);
+        }
+        else
+        {
+            error = RT_EOK;
+        }
+
+        if (!error)
+        {
+            /* remove from suspend list */
+            rt_list_remove(&RT_THREAD_LIST_NODE(thread));
+
+        #ifdef RT_USING_SMART
+            thread->wakeup_handle.func = RT_NULL;
+        #endif
+
+            /* insert to schedule ready list and remove from susp list */
+            rt_sched_insert_thread(thread);
+        }
+    }
+
+    return error;
+}
+
+/**
+ * @brief Increase the system tick and update thread's remaining time slice
+ *
+ * @param tick The number of ticks to increase
+ * @return rt_err_t Always returns RT_EOK
+ *
+ * @details This function:
+ *   - Gets the current thread
+ *   - Locks the scheduler
+ *   - Decreases the thread's remaining tick count by the specified amount
+ *   - If remaining ticks reach zero:
+ *     * Calls rt_sched_thread_yield() to yield the thread
+ *     * Requests a reschedule with rt_sched_unlock_n_resched()
+ *   - Otherwise simply unlocks the scheduler
+ *
+ * @note This function is typically called from timer interrupt context
+ *       It handles both SMP and non-SMP cases
+ */
+rt_err_t rt_sched_tick_increase(rt_tick_t tick)
+{
+    struct rt_thread *thread;
+    rt_sched_lock_level_t slvl;
+
+    thread = rt_thread_self();
+
+    rt_sched_lock(&slvl);
+
+    if(RT_SCHED_PRIV(thread).remaining_tick > tick)
+    {
+        RT_SCHED_PRIV(thread).remaining_tick -= tick;
+    }
+    else
+    {
+        RT_SCHED_PRIV(thread).remaining_tick = 0;
+    }
+
+    if (RT_SCHED_PRIV(thread).remaining_tick)
+    {
+        rt_sched_unlock(slvl);
+    }
+    else
+    {
+        rt_sched_thread_yield(thread);
+
+        /* request a rescheduling even though we are probably in an ISR */
+        rt_sched_unlock_n_resched(slvl);
+    }
+
+    return RT_EOK;
+}
+
+/**
+ * @brief Update thread priority and adjust scheduling attributes
+ *
+ * @param thread The thread to update priority for
+ * @param priority New priority value to set
+ * @param update_init_prio Flag to determine if initial priority should also be updated
+ * @return rt_err_t Always returns RT_EOK on success
+ *
+ * @details This function:
+ *   - Requires scheduler lock to be held (RT_SCHED_DEBUG_IS_LOCKED)
+ *   - For ready threads:
+ *     * Removes from ready queue
+ *     * Updates priority values
+ *     * Recalculates priority attributes (number, mask, etc.)
+ *     * Reinserts into ready queue with new priority
+ *   - For non-ready threads:
+ *     * Only updates priority values and attributes
+ *   - Handles both 32-bit and >32-bit priority systems
+ *
+ * @note Must be called with scheduler lock held
+ *       Thread status must be valid before calling
+ */
+static rt_err_t _rt_sched_update_priority(struct rt_thread *thread, rt_uint8_t priority, rt_bool_t update_init_prio)
+{
+    RT_ASSERT(priority < RT_THREAD_PRIORITY_MAX);
+    RT_SCHED_DEBUG_IS_LOCKED;
+
+    /* for ready thread, change queue; otherwise simply update the priority */
+    if ((RT_SCHED_CTX(thread).stat & RT_THREAD_STAT_MASK) == RT_THREAD_READY)
+    {
+        /* remove thread from schedule queue first */
+        rt_sched_remove_thread(thread);
+
+        /* change thread priority */
+        if (update_init_prio)
+        {
+            RT_SCHED_PRIV(thread).init_priority = priority;
+        }
+        RT_SCHED_PRIV(thread).current_priority = priority;
+
+        /* recalculate priority attribute */
+#if RT_THREAD_PRIORITY_MAX > 32
+        RT_SCHED_PRIV(thread).number = RT_SCHED_PRIV(thread).current_priority >> 3;               /* 5bit */
+        RT_SCHED_PRIV(thread).number_mask = 1 << RT_SCHED_PRIV(thread).number;
+        RT_SCHED_PRIV(thread).high_mask = 1 << (RT_SCHED_PRIV(thread).current_priority & 0x07);   /* 3bit */
+#else
+        RT_SCHED_PRIV(thread).number_mask = 1 << RT_SCHED_PRIV(thread).current_priority;
+#endif /* RT_THREAD_PRIORITY_MAX > 32 */
+        RT_SCHED_CTX(thread).stat = RT_THREAD_INIT;
+
+        /* insert thread to schedule queue again */
+        rt_sched_insert_thread(thread);
+    }
+    else
+    {
+        if (update_init_prio)
+        {
+            RT_SCHED_PRIV(thread).init_priority = priority;
+        }
+        RT_SCHED_PRIV(thread).current_priority = priority;
+
+        /* recalculate priority attribute */
+#if RT_THREAD_PRIORITY_MAX > 32
+        RT_SCHED_PRIV(thread).number = RT_SCHED_PRIV(thread).current_priority >> 3;               /* 5bit */
+        RT_SCHED_PRIV(thread).number_mask = 1 << RT_SCHED_PRIV(thread).number;
+        RT_SCHED_PRIV(thread).high_mask = 1 << (RT_SCHED_PRIV(thread).current_priority & 0x07);   /* 3bit */
+#else
+        RT_SCHED_PRIV(thread).number_mask = 1 << RT_SCHED_PRIV(thread).current_priority;
+#endif /* RT_THREAD_PRIORITY_MAX > 32 */
+    }
+
+    return RT_EOK;
+}
+
+/**
+ * @brief Update priority of the target thread
+ */
+rt_err_t rt_sched_thread_change_priority(struct rt_thread *thread, rt_uint8_t priority)
+{
+    return _rt_sched_update_priority(thread, priority, RT_FALSE);
+}
+
+/**
+ * @brief Reset priority of the target thread
+ */
+rt_err_t rt_sched_thread_reset_priority(struct rt_thread *thread, rt_uint8_t priority)
+{
+    return _rt_sched_update_priority(thread, priority, RT_TRUE);
+}
+
+#ifdef RT_USING_OVERFLOW_CHECK
+/**
+ * @brief Check thread stack for overflow or near-overflow conditions
+ *
+ * @param thread The thread to check stack for
+ *
+ * @details This function performs the following checks:
+ *   - For SMART mode without MMU: skips check if SP is in user data section
+ *   - Without hardware stack guard:
+ *     * For upward-growing stacks: checks magic number at top and SP range
+ *     * For downward-growing stacks: checks magic number at bottom and SP range
+ *     * Triggers error and infinite loop on overflow
+ *   - Additional warnings when stack pointer is near boundaries
+ */
+void rt_scheduler_stack_check(struct rt_thread *thread)
+{
+    RT_ASSERT(thread != RT_NULL);
+
+#ifdef RT_USING_SMART
+#ifndef ARCH_MM_MMU
+    struct rt_lwp *lwp = thread ? (struct rt_lwp *)thread->lwp : 0;
+
+    /* if stack pointer locate in user data section skip stack check. */
+    if (lwp && ((rt_uint32_t)thread->sp > (rt_uint32_t)lwp->data_entry &&
+    (rt_uint32_t)thread->sp <= (rt_uint32_t)lwp->data_entry + (rt_uint32_t)lwp->data_size))
+    {
+        return;
+    }
+#endif /* not defined ARCH_MM_MMU */
+#endif /* RT_USING_SMART */
+
+#ifndef RT_USING_HW_STACK_GUARD
+#ifdef ARCH_CPU_STACK_GROWS_UPWARD
+    if (*((rt_uint8_t *)((rt_uintptr_t)thread->stack_addr + thread->stack_size - 1)) != '#' ||
+#else
+    if (*((rt_uint8_t *)thread->stack_addr) != '#' ||
+#endif /* ARCH_CPU_STACK_GROWS_UPWARD */
+        (rt_uintptr_t)thread->sp <= (rt_uintptr_t)thread->stack_addr ||
+        (rt_uintptr_t)thread->sp >
+        (rt_uintptr_t)thread->stack_addr + (rt_uintptr_t)thread->stack_size)
+    {
+        rt_base_t dummy = 1;
+
+        LOG_E("thread:%s stack overflow\n", thread->parent.name);
+
+        while (dummy);
+    }
+#endif /* RT_USING_HW_STACK_GUARD */
+#ifdef ARCH_CPU_STACK_GROWS_UPWARD
+#ifndef RT_USING_HW_STACK_GUARD
+    else if ((rt_uintptr_t)thread->sp > ((rt_uintptr_t)thread->stack_addr + thread->stack_size))
+#else
+    if ((rt_uintptr_t)thread->sp > ((rt_uintptr_t)thread->stack_addr + thread->stack_size))
+#endif
+    {
+        LOG_W("warning: %s stack is close to the top of stack address.\n",
+                   thread->parent.name);
+    }
+#else
+#ifndef RT_USING_HW_STACK_GUARD
+    else if ((rt_uintptr_t)thread->sp <= ((rt_uintptr_t)thread->stack_addr + 32))
+#else
+    if ((rt_uintptr_t)thread->sp <= ((rt_uintptr_t)thread->stack_addr + 32))
+#endif
+    {
+        LOG_W("warning: %s stack is close to end of stack address.\n",
+                   thread->parent.name);
+    }
+#endif /* ARCH_CPU_STACK_GROWS_UPWARD */
+}
+
+#endif /* RT_USING_OVERFLOW_CHECK */

rt-thread/src/scheduler_up.c

@@ -0,0 +1,735 @@
+/*
+ * Copyright (c) 2006-2025 RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2006-03-17     Bernard      the first version
+ * 2006-04-28     Bernard      fix the scheduler algorthm
+ * 2006-04-30     Bernard      add SCHEDULER_DEBUG
+ * 2006-05-27     Bernard      fix the scheduler algorthm for same priority
+ *                             thread schedule
+ * 2006-06-04     Bernard      rewrite the scheduler algorithm
+ * 2006-08-03     Bernard      add hook support
+ * 2006-09-05     Bernard      add 32 priority level support
+ * 2006-09-24     Bernard      add rt_system_scheduler_start function
+ * 2009-09-16     Bernard      fix _rt_scheduler_stack_check
+ * 2010-04-11     yi.qiu       add module feature
+ * 2010-07-13     Bernard      fix the maximal number of rt_scheduler_lock_nest
+ *                             issue found by kuronca
+ * 2010-12-13     Bernard      add defunct list initialization even if not use heap.
+ * 2011-05-10     Bernard      clean scheduler debug log.
+ * 2013-12-21     Grissiom     add rt_critical_level
+ * 2018-11-22     Jesven       remove the current task from ready queue
+ *                             add per cpu ready queue
+ *                             add _scheduler_get_highest_priority_thread to find highest priority task
+ *                             rt_schedule_insert_thread won't insert current task to ready queue
+ *                             in smp version, rt_hw_context_switch_interrupt maybe switch to
+ *                             new task directly
+ * 2022-01-07     Gabriel      Moving __on_rt_xxxxx_hook to scheduler.c
+ * 2023-03-27     rose_man     Split into scheduler upc and scheduler_mp.c
+ * 2023-10-17     ChuShicheng  Modify the timing of clearing RT_THREAD_STAT_YIELD flag bits
+ * 2025-08-04     Pillar       Add rt_scheduler_critical_switch_flag
+ */
+
+#define __RT_IPC_SOURCE__
+#include <rtthread.h>
+#include <rthw.h>
+
+#define DBG_TAG           "kernel.scheduler"
+#define DBG_LVL           DBG_INFO
+#include <rtdbg.h>
+
+rt_list_t rt_thread_priority_table[RT_THREAD_PRIORITY_MAX];
+rt_uint32_t rt_thread_ready_priority_group;
+#if RT_THREAD_PRIORITY_MAX > 32
+/* Maximum priority level, 256 */
+rt_uint8_t rt_thread_ready_table[32];
+#endif /* RT_THREAD_PRIORITY_MAX > 32 */
+
+extern volatile rt_atomic_t rt_interrupt_nest;
+static rt_int16_t rt_scheduler_lock_nest;
+rt_uint8_t rt_current_priority;
+
+static rt_int8_t rt_scheduler_critical_switch_flag;
+#define IS_CRITICAL_SWITCH_PEND()  (rt_scheduler_critical_switch_flag == 1)
+#define SET_CRITICAL_SWITCH_FLAG() (rt_scheduler_critical_switch_flag = 1)
+#define CLR_CRITICAL_SWITCH_FLAG() (rt_scheduler_critical_switch_flag = 0)
+
+#if defined(RT_USING_HOOK) && defined(RT_HOOK_USING_FUNC_PTR)
+static void (*rt_scheduler_hook)(struct rt_thread *from, struct rt_thread *to);
+static void (*rt_scheduler_switch_hook)(struct rt_thread *tid);
+
+/**
+ * @addtogroup group_hook
+ */
+
+/**@{*/
+
+/**
+ * @brief This function will set a hook function, which will be invoked when thread
+ *        switch happens.
+ *
+ * @param hook is the hook function.
+ */
+void rt_scheduler_sethook(void (*hook)(struct rt_thread *from, struct rt_thread *to))
+{
+    rt_scheduler_hook = hook;
+}
+
+/**
+ * @brief This function will set a hook function, which will be invoked when context
+ *        switch happens.
+ *
+ * @param hook is the hook function.
+ */
+void rt_scheduler_switch_sethook(void (*hook)(struct rt_thread *tid))
+{
+    rt_scheduler_switch_hook = hook;
+}
+
+/**@}*/
+#endif /* RT_USING_HOOK */
+
+static struct rt_thread* _scheduler_get_highest_priority_thread(rt_ubase_t *highest_prio)
+{
+    struct rt_thread *highest_priority_thread;
+    rt_ubase_t highest_ready_priority;
+
+#if RT_THREAD_PRIORITY_MAX > 32
+    rt_ubase_t number;
+
+    number = __rt_ffs(rt_thread_ready_priority_group) - 1;
+    highest_ready_priority = (number << 3) + __rt_ffs(rt_thread_ready_table[number]) - 1;
+#else
+    highest_ready_priority = __rt_ffs(rt_thread_ready_priority_group) - 1;
+#endif /* RT_THREAD_PRIORITY_MAX > 32 */
+
+    /* get highest ready priority thread */
+    highest_priority_thread = RT_THREAD_LIST_NODE_ENTRY(rt_thread_priority_table[highest_ready_priority].next);
+
+    *highest_prio = highest_ready_priority;
+
+    return highest_priority_thread;
+}
+
+/**
+ * @brief Lock the scheduler and save the interrupt level
+ *
+ * @param plvl Pointer to store the interrupt level before locking
+ *
+ * @return rt_err_t
+ *   - RT_EOK on success
+ *   - -RT_EINVAL if plvl is NULL
+ *
+ * @details This function:
+ *   - Disables interrupts to prevent preemption
+ *   - Saves the previous interrupt level in plvl
+ *   - Must be paired with rt_sched_unlock() to restore interrupts
+ *
+ * @note The lock is implemented by disabling interrupts
+ *       Caller must ensure plvl is valid
+ */
+rt_err_t rt_sched_lock(rt_sched_lock_level_t *plvl)
+{
+    rt_base_t level;
+    if (!plvl)
+        return -RT_EINVAL;
+
+    level = rt_hw_interrupt_disable();
+    *plvl = level;
+
+    return RT_EOK;
+}
+
+/**
+ * @brief Unlock the scheduler and restore the interrupt level
+ *
+ * @param level The interrupt level to restore (previously saved by rt_sched_lock)
+ * @return rt_err_t Always returns RT_EOK
+ *
+ * @details This function:
+ *   - Restores the interrupt level that was saved when locking the scheduler
+ *   - Must be called to match each rt_sched_lock() call
+ *
+ * @note Must be called with the same interrupt level that was saved by rt_sched_lock()
+ *       Should not be called without a corresponding rt_sched_lock() first
+ */
+rt_err_t rt_sched_unlock(rt_sched_lock_level_t level)
+{
+    rt_hw_interrupt_enable(level);
+
+    return RT_EOK;
+}
+
+/**
+ * @brief Unlock scheduler and trigger a reschedule if needed
+ *
+ * @param level The interrupt level to restore (previously saved by rt_sched_lock)
+ * @return rt_err_t Always returns RT_EOK
+ *
+ * @details This function:
+ *   - Restores the interrupt level that was saved when locking the scheduler
+ *   - Triggers a reschedule if the scheduler is available (rt_thread_self() != NULL)
+ *   - Combines the functionality of rt_sched_unlock() and rt_schedule()
+ */
+rt_err_t rt_sched_unlock_n_resched(rt_sched_lock_level_t level)
+{
+    if (rt_thread_self())
+    {
+        /* if scheduler is available */
+        rt_schedule();
+    }
+    rt_hw_interrupt_enable(level);
+
+    return RT_EOK;
+}
+
+/**
+ * @brief Initialize the system scheduler for single-core systems
+ *
+ * @details This function performs the following initialization tasks:
+ *   - Resets the scheduler lock nest counter to 0
+ *   - Initializes the priority table for all priority levels
+ *   - Clears the ready priority group bitmap
+ *   - For systems with >32 priority levels, initializes the ready table
+ *
+ * @note This function must be called before any thread scheduling can occur.
+ *       It prepares the scheduler data structures for single-core operation
+ */
+void rt_system_scheduler_init(void)
+{
+    rt_base_t offset;
+    rt_scheduler_lock_nest = 0;
+
+    LOG_D("start scheduler: max priority 0x%02x",
+          RT_THREAD_PRIORITY_MAX);
+
+    for (offset = 0; offset < RT_THREAD_PRIORITY_MAX; offset ++)
+    {
+        rt_list_init(&rt_thread_priority_table[offset]);
+    }
+
+    /* initialize ready priority group */
+    rt_thread_ready_priority_group = 0;
+
+#if RT_THREAD_PRIORITY_MAX > 32
+    /* initialize ready table */
+    rt_memset(rt_thread_ready_table, 0, sizeof(rt_thread_ready_table));
+#endif /* RT_THREAD_PRIORITY_MAX > 32 */
+}
+
+/**
+ * @brief Start the system scheduler and switch to the highest priority thread
+ *
+ * @details This function:
+ *   - Gets the highest priority ready thread using _scheduler_get_highest_priority_thread()
+ *   - Sets it as the current thread for the CPU
+ *   - Removes the thread from ready queue and sets its status to RUNNING
+ *   - Performs a context switch to the selected thread using rt_hw_context_switch_to()
+ *
+ * @note This function does not return as it switches to the first thread to run.
+ *       Must be called after rt_system_scheduler_init().
+ *       The selected thread will begin execution immediately
+ */
+void rt_system_scheduler_start(void)
+{
+    struct rt_thread *to_thread;
+    rt_ubase_t highest_ready_priority;
+
+    to_thread = _scheduler_get_highest_priority_thread(&highest_ready_priority);
+
+    rt_cpu_self()->current_thread = to_thread;
+
+    /* flush critical switch flag */
+    CLR_CRITICAL_SWITCH_FLAG();
+
+    rt_sched_remove_thread(to_thread);
+    RT_SCHED_CTX(to_thread).stat = RT_THREAD_RUNNING;
+
+    /* switch to new thread */
+
+    rt_hw_context_switch_to((rt_uintptr_t)&to_thread->sp);
+
+    /* never come back */
+}
+
+/**
+ * @addtogroup group_thread_management
+ * @cond
+ */
+
+/**@{*/
+
+/**
+ * @brief Perform thread scheduling once. Select the highest priority thread and switch to it.
+ *
+ * @details This function:
+ *   - Disables interrupts to prevent preemption during scheduling
+ *   - Checks if scheduler is enabled (lock_nest == 0)
+ *   - Gets the highest priority ready thread
+ *   - Determines if current thread should continue running or be preempted
+ *   - Performs context switch if needed:
+ *     * From current thread to new thread (normal case)
+ *     * Handles special cases like interrupt context switches
+ *   - Manages thread states (READY/RUNNING) and priority queues
+ *   - Handles thread yield flags and signal processing
+ */
+void rt_schedule(void)
+{
+    rt_base_t level;
+    struct rt_thread *to_thread;
+    struct rt_thread *from_thread;
+    /* using local variable to avoid unecessary function call */
+    struct rt_thread *curr_thread = rt_thread_self();
+
+    /* disable interrupt */
+    level = rt_hw_interrupt_disable();
+
+    /* check the scheduler is enabled or not */
+    if (rt_scheduler_lock_nest == 0)
+    {
+        rt_ubase_t highest_ready_priority;
+
+        if (rt_thread_ready_priority_group != 0)
+        {
+            /* need_insert_from_thread: need to insert from_thread to ready queue */
+            int need_insert_from_thread = 0;
+
+            to_thread = _scheduler_get_highest_priority_thread(&highest_ready_priority);
+
+            if ((RT_SCHED_CTX(curr_thread).stat & RT_THREAD_STAT_MASK) == RT_THREAD_RUNNING)
+            {
+                if (RT_SCHED_PRIV(curr_thread).current_priority < highest_ready_priority)
+                {
+                    to_thread = curr_thread;
+                }
+                else if (RT_SCHED_PRIV(curr_thread).current_priority == highest_ready_priority
+                         && (RT_SCHED_CTX(curr_thread).stat & RT_THREAD_STAT_YIELD_MASK) == 0)
+                {
+                    to_thread = curr_thread;
+                }
+                else
+                {
+                    need_insert_from_thread = 1;
+                }
+            }
+
+            if (to_thread != curr_thread)
+            {
+                /* if the destination thread is not the same as current thread */
+                rt_current_priority = (rt_uint8_t)highest_ready_priority;
+                from_thread                   = curr_thread;
+                rt_cpu_self()->current_thread = to_thread;
+
+                RT_OBJECT_HOOK_CALL(rt_scheduler_hook, (from_thread, to_thread));
+
+                if (need_insert_from_thread)
+                {
+                    rt_sched_insert_thread(from_thread);
+                }
+
+                if ((RT_SCHED_CTX(from_thread).stat & RT_THREAD_STAT_YIELD_MASK) != 0)
+                {
+                    RT_SCHED_CTX(from_thread).stat &= ~RT_THREAD_STAT_YIELD_MASK;
+                }
+
+                rt_sched_remove_thread(to_thread);
+                RT_SCHED_CTX(to_thread).stat = RT_THREAD_RUNNING | (RT_SCHED_CTX(to_thread).stat & ~RT_THREAD_STAT_MASK);
+
+                /* switch to new thread */
+                LOG_D("[%d]switch to priority#%d "
+                         "thread:%.*s(sp:0x%08x), "
+                         "from thread:%.*s(sp: 0x%08x)",
+                         rt_interrupt_nest, highest_ready_priority,
+                         RT_NAME_MAX, to_thread->parent.name, to_thread->sp,
+                         RT_NAME_MAX, from_thread->parent.name, from_thread->sp);
+
+                RT_SCHEDULER_STACK_CHECK(to_thread);
+
+                if (rt_interrupt_nest == 0)
+                {
+                    extern void rt_thread_handle_sig(rt_bool_t clean_state);
+
+                    RT_OBJECT_HOOK_CALL(rt_scheduler_switch_hook, (from_thread));
+
+                    rt_hw_context_switch((rt_uintptr_t)&from_thread->sp,
+                            (rt_uintptr_t)&to_thread->sp);
+
+                    /* enable interrupt */
+                    rt_hw_interrupt_enable(level);
+
+#ifdef RT_USING_SIGNALS
+                    /* check stat of thread for signal */
+                    level = rt_hw_interrupt_disable();
+                    if (RT_SCHED_CTX(curr_thread).stat & RT_THREAD_STAT_SIGNAL_PENDING)
+                    {
+                        extern void rt_thread_handle_sig(rt_bool_t clean_state);
+
+                        RT_SCHED_CTX(curr_thread).stat &= ~RT_THREAD_STAT_SIGNAL_PENDING;
+
+                        rt_hw_interrupt_enable(level);
+
+                        /* check signal status */
+                        rt_thread_handle_sig(RT_TRUE);
+                    }
+                    else
+                    {
+                        rt_hw_interrupt_enable(level);
+                    }
+#endif /* RT_USING_SIGNALS */
+                    goto __exit;
+                }
+                else
+                {
+                    LOG_D("switch in interrupt");
+
+                    rt_hw_context_switch_interrupt((rt_uintptr_t)&from_thread->sp,
+                            (rt_uintptr_t)&to_thread->sp, from_thread, to_thread);
+                }
+            }
+            else
+            {
+                rt_sched_remove_thread(curr_thread);
+                RT_SCHED_CTX(curr_thread).stat = RT_THREAD_RUNNING | (RT_SCHED_CTX(curr_thread).stat & ~RT_THREAD_STAT_MASK);
+            }
+        }
+    }
+    else
+    {
+        SET_CRITICAL_SWITCH_FLAG();
+    }
+
+    /* enable interrupt */
+    rt_hw_interrupt_enable(level);
+
+__exit:
+    return;
+}
+
+/**
+ * @brief Initialize thread scheduling attributes for startup
+ *
+ * @param thread The thread to be initialized
+ *
+ * @details This function:
+ *   - For systems with >32 priority levels:
+ *     * Sets the thread's priority group number (5 bits)
+ *     * Creates number mask for the priority group
+ *     * Creates high mask for the specific priority (3 bits)
+ *   - For systems with <=32 priority levels:
+ *     * Creates a simple number mask for the priority
+ *   - Sets thread state to SUSPEND to prepare for later activation
+ *
+ * @note This function must be called before a thread can be scheduled.
+ *       It prepares the thread's priority-related data structures.
+ *       Normally, there isn't anyone racing with us so this operation is lockless
+ */
+void rt_sched_thread_startup(struct rt_thread *thread)
+{
+#if RT_THREAD_PRIORITY_MAX > 32
+    RT_SCHED_PRIV(thread).number = RT_SCHED_PRIV(thread).current_priority >> 3;            /* 5bit */
+    RT_SCHED_PRIV(thread).number_mask = 1L << RT_SCHED_PRIV(thread).number;
+    RT_SCHED_PRIV(thread).high_mask = 1L << (RT_SCHED_PRIV(thread).current_priority & 0x07);  /* 3bit */
+#else
+    RT_SCHED_PRIV(thread).number_mask = 1L << RT_SCHED_PRIV(thread).current_priority;
+#endif /* RT_THREAD_PRIORITY_MAX > 32 */
+
+    /* change thread stat, so we can resume it */
+    RT_SCHED_CTX(thread).stat = RT_THREAD_SUSPEND;
+}
+
+/**
+ * @brief Initialize thread's scheduling private data
+ *
+ * @param thread Pointer to the thread control block
+ * @param tick Initial time slice value for the thread
+ * @param priority Initial priority of the thread
+ *
+ * @details This function:
+ *   - Initializes the thread's list node
+ *   - Sets initial and current priority (must be < RT_THREAD_PRIORITY_MAX)
+ *   - Initializes priority masks (number_mask, number, high_mask for >32 priorities)
+ *   - Sets initial and remaining time slice ticks
+ */
+void rt_sched_thread_init_priv(struct rt_thread *thread, rt_uint32_t tick, rt_uint8_t priority)
+{
+    rt_list_init(&RT_THREAD_LIST_NODE(thread));
+
+    /* priority init */
+    RT_ASSERT(priority < RT_THREAD_PRIORITY_MAX);
+    RT_SCHED_PRIV(thread).init_priority    = priority;
+    RT_SCHED_PRIV(thread).current_priority = priority;
+
+    /* don't add to scheduler queue as init thread */
+    RT_SCHED_PRIV(thread).number_mask = 0;
+#if RT_THREAD_PRIORITY_MAX > 32
+    RT_SCHED_PRIV(thread).number = 0;
+    RT_SCHED_PRIV(thread).high_mask = 0;
+#endif /* RT_THREAD_PRIORITY_MAX > 32 */
+
+    /* tick init */
+    RT_SCHED_PRIV(thread).init_tick = tick;
+    RT_SCHED_PRIV(thread).remaining_tick = tick;
+}
+
+/**
+ * @brief This function will insert a thread to the system ready queue. The state of
+ *        thread will be set as READY and the thread will be removed from suspend queue.
+ *
+ * @param thread is the thread to be inserted.
+ *
+ * @note  Please do not invoke this function in user application.
+ */
+void rt_sched_insert_thread(struct rt_thread *thread)
+{
+    rt_base_t level;
+
+    RT_ASSERT(thread != RT_NULL);
+
+    /* disable interrupt */
+    level = rt_hw_interrupt_disable();
+
+    /* it's current thread, it should be RUNNING thread */
+    if (thread == rt_current_thread)
+    {
+        RT_SCHED_CTX(thread).stat = RT_THREAD_RUNNING | (RT_SCHED_CTX(thread).stat & ~RT_THREAD_STAT_MASK);
+        goto __exit;
+    }
+
+    /* READY thread, insert to ready queue */
+    RT_SCHED_CTX(thread).stat = RT_THREAD_READY | (RT_SCHED_CTX(thread).stat & ~RT_THREAD_STAT_MASK);
+    /* there is no time slices left(YIELD), inserting thread before ready list*/
+    if((RT_SCHED_CTX(thread).stat & RT_THREAD_STAT_YIELD_MASK) != 0)
+    {
+        rt_list_insert_before(&(rt_thread_priority_table[RT_SCHED_PRIV(thread).current_priority]),
+                              &RT_THREAD_LIST_NODE(thread));
+    }
+    /* there are some time slices left, inserting thread after ready list to schedule it firstly at next time*/
+    else
+    {
+        rt_list_insert_after(&(rt_thread_priority_table[RT_SCHED_PRIV(thread).current_priority]),
+                              &RT_THREAD_LIST_NODE(thread));
+    }
+
+    LOG_D("insert thread[%.*s], the priority: %d",
+          RT_NAME_MAX, thread->parent.name, RT_SCHED_PRIV(rt_current_thread).current_priority);
+
+    /* set priority mask */
+#if RT_THREAD_PRIORITY_MAX > 32
+    rt_thread_ready_table[RT_SCHED_PRIV(thread).number] |= RT_SCHED_PRIV(thread).high_mask;
+#endif /* RT_THREAD_PRIORITY_MAX > 32 */
+    rt_thread_ready_priority_group |= RT_SCHED_PRIV(thread).number_mask;
+
+__exit:
+    /* enable interrupt */
+    rt_hw_interrupt_enable(level);
+}
+
+/**
+ * @brief This function will remove a thread from system ready queue.
+ *
+ * @param thread is the thread to be removed.
+ *
+ * @note  Please do not invoke this function in user application.
+ */
+void rt_sched_remove_thread(struct rt_thread *thread)
+{
+    rt_base_t level;
+
+    RT_ASSERT(thread != RT_NULL);
+
+    /* disable interrupt */
+    level = rt_hw_interrupt_disable();
+
+    LOG_D("remove thread[%.*s], the priority: %d",
+          RT_NAME_MAX, thread->parent.name,
+          RT_SCHED_PRIV(rt_current_thread).current_priority);
+
+    /* remove thread from ready list */
+    rt_list_remove(&RT_THREAD_LIST_NODE(thread));
+    if (rt_list_isempty(&(rt_thread_priority_table[RT_SCHED_PRIV(thread).current_priority])))
+    {
+#if RT_THREAD_PRIORITY_MAX > 32
+        rt_thread_ready_table[RT_SCHED_PRIV(thread).number] &= ~RT_SCHED_PRIV(thread).high_mask;
+        if (rt_thread_ready_table[RT_SCHED_PRIV(thread).number] == 0)
+        {
+            rt_thread_ready_priority_group &= ~RT_SCHED_PRIV(thread).number_mask;
+        }
+#else
+        rt_thread_ready_priority_group &= ~RT_SCHED_PRIV(thread).number_mask;
+#endif /* RT_THREAD_PRIORITY_MAX > 32 */
+    }
+
+    /* enable interrupt */
+    rt_hw_interrupt_enable(level);
+}
+
+#ifdef RT_DEBUGING_CRITICAL
+
+static volatile int _critical_error_occurred = 0;
+
+/**
+ * @brief Safely exit critical section with level checking
+ *
+ * @param critical_level The expected critical level to match current lock nest
+ *
+ * @details This function:
+ *   - Disables interrupts to prevent preemption during check
+ *   - Verifies the provided critical_level matches current rt_scheduler_lock_nest
+ *   - If mismatch detected (debug mode only):
+ *     * Sets error flag
+ *     * Prints debug information including backtrace
+ *     * Enters infinite loop to halt system
+ *   - Always calls rt_exit_critical() to perform actual exit
+ *
+ * @note This is a debug version that adds safety checks for critical section exit.
+ */
+void rt_exit_critical_safe(rt_base_t critical_level)
+{
+    rt_base_t level;
+    /* disable interrupt */
+    level = rt_hw_interrupt_disable();
+
+    if (!_critical_error_occurred)
+    {
+        if (critical_level != rt_scheduler_lock_nest)
+        {
+            int dummy = 1;
+            _critical_error_occurred = 1;
+
+            rt_kprintf("%s: un-compatible critical level\n" \
+                       "\tCurrent %d\n\tCaller %d\n",
+                       __func__, rt_scheduler_lock_nest,
+                       critical_level);
+            rt_backtrace();
+
+            while (dummy) ;
+        }
+    }
+    rt_hw_interrupt_enable(level);
+
+    rt_exit_critical();
+}
+
+#else /* !RT_DEBUGING_CRITICAL */
+
+/**
+ * @brief Safely exit critical section (non-debug version)
+ *        If the scheduling function is called before exiting, it will be scheduled in this function.
+ *
+ * @param critical_level The expected critical level (unused in non-debug build)
+ *
+ * @details This is the non-debug version that simply calls rt_exit_critical().
+ *          The critical_level parameter is ignored in this implementation.
+ */
+void rt_exit_critical_safe(rt_base_t critical_level)
+{
+    rt_exit_critical();
+}
+
+#endif/* RT_DEBUGING_CRITICAL */
+RTM_EXPORT(rt_exit_critical_safe);
+
+/**
+ * @brief Enter critical section and lock the scheduler
+ *
+ * @return rt_base_t The current critical level (nesting count)
+ *
+ * @details This function:
+ *   - Disables interrupts to prevent preemption
+ *   - Increments the scheduler lock nesting count
+ *   - Returns the new nesting count as critical level
+ *   - Re-enables interrupts while maintaining the lock
+ *
+ * @note The nesting count can go up to RT_UINT16_MAX.
+ *       Must be paired with rt_exit_critical().
+ *       Interrupts are only disabled during the lock operation.
+ */
+rt_base_t rt_enter_critical(void)
+{
+    rt_base_t level;
+    rt_base_t critical_level;
+
+    /* disable interrupt */
+    level = rt_hw_interrupt_disable();
+
+    /*
+     * the maximal number of nest is RT_UINT16_MAX, which is big
+     * enough and does not check here
+     */
+    rt_scheduler_lock_nest ++;
+    critical_level = rt_scheduler_lock_nest;
+
+    /* enable interrupt */
+    rt_hw_interrupt_enable(level);
+
+    return critical_level;
+}
+RTM_EXPORT(rt_enter_critical);
+
+/**
+ * @brief Exit critical section and unlock scheduler
+ *        If the scheduling function is called before exiting, it will be scheduled in this function.
+ *
+ * @details This function:
+ *   - Decrements the scheduler lock nesting count
+ *   - If nesting count reaches zero:
+ *     * Resets the nesting count
+ *     * Re-enables interrupts
+ *     * Triggers a scheduler run if current thread exists
+ *   - If nesting count still positive:
+ *     * Just re-enables interrupts while maintaining lock
+ *
+ * @note Must be paired with rt_enter_critical().
+ *       Interrupts are only disabled during the lock operation.
+ *       Scheduling only occurs when fully unlocked (nest=0)
+ */
+void rt_exit_critical(void)
+{
+    rt_base_t level;
+
+    /* disable interrupt */
+    level = rt_hw_interrupt_disable();
+
+    rt_scheduler_lock_nest --;
+    if (rt_scheduler_lock_nest <= 0)
+    {
+        rt_scheduler_lock_nest = 0;
+        /* enable interrupt */
+        rt_hw_interrupt_enable(level);
+
+        if (IS_CRITICAL_SWITCH_PEND())
+        {
+            CLR_CRITICAL_SWITCH_FLAG();
+            /* if scheduler is started and needs to be scheduled, do a schedule */
+            rt_schedule();
+        }
+    }
+    else
+    {
+        /* enable interrupt */
+        rt_hw_interrupt_enable(level);
+    }
+}
+RTM_EXPORT(rt_exit_critical);
+
+/**
+ * @brief Get the scheduler lock level.
+ *
+ * @return the level of the scheduler lock. 0 means unlocked.
+ */
+rt_uint16_t rt_critical_level(void)
+{
+    return rt_scheduler_lock_nest;
+}
+RTM_EXPORT(rt_critical_level);
+
+rt_err_t rt_sched_thread_bind_cpu(struct rt_thread *thread, int cpu)
+{
+    return -RT_EINVAL;
+}
+
+/**@}*/
+/**@endcond*/

rt-thread/src/signal.c

@@ -0,0 +1,680 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017/10/5      Bernard      the first version
+ * 2018/09/17     Jesven       fix: in _signal_deliver RT_THREAD_STAT_MASK to RT_THREAD_STAT_SIGNAL_MASK
+ * 2018/11/22     Jesven       in smp version rt_hw_context_switch_to add a param
+ */
+
+#include <stdint.h>
+#include <string.h>
+
+#include <rthw.h>
+#include <rtthread.h>
+
+#ifdef RT_USING_SIGNALS
+
+#ifndef RT_SIG_INFO_MAX
+    #ifdef ARCH_CPU_64BIT
+        #define RT_SIG_INFO_MAX 64
+    #else
+        #define RT_SIG_INFO_MAX 32
+    #endif /* ARCH_CPU_64BIT */
+#endif /* RT_SIG_INFO_MAX */
+
+#define DBG_TAG     "SIGN"
+#define DBG_LVL     DBG_WARNING
+#include <rtdbg.h>
+
+#ifdef RT_USING_MUSLLIBC
+    #define sig_mask(sig_no)    (1u << (sig_no - 1))
+#else
+    #define sig_mask(sig_no)    (1u << sig_no)
+#endif
+#define sig_valid(sig_no)   (sig_no >= 0 && sig_no < RT_SIG_MAX)
+
+static struct rt_spinlock _thread_signal_lock = RT_SPINLOCK_INIT;
+
+struct siginfo_node
+{
+    siginfo_t si;
+    struct rt_slist_node list;
+};
+
+static struct rt_mempool *_siginfo_pool;
+static void _signal_deliver(rt_thread_t tid);
+void rt_thread_handle_sig(rt_bool_t clean_state);
+
+static void _signal_default_handler(int signo)
+{
+    RT_UNUSED(signo);
+    LOG_I("handled signo[%d] with default action.", signo);
+    return ;
+}
+
+static void _signal_entry(void *parameter)
+{
+    RT_UNUSED(parameter);
+
+    rt_thread_t tid = rt_thread_self();
+
+    /* handle signal */
+    rt_thread_handle_sig(RT_FALSE);
+
+#ifdef RT_USING_SMP
+#else
+    /* return to thread */
+    tid->sp = tid->sig_ret;
+    tid->sig_ret = RT_NULL;
+#endif /* RT_USING_SMP */
+
+    LOG_D("switch back to: 0x%08x\n", tid->sp);
+    RT_SCHED_CTX(tid).stat &= ~RT_THREAD_STAT_SIGNAL;
+
+#ifdef RT_USING_SMP
+    rt_hw_context_switch_to((rt_uintptr_t)&parameter, tid);
+#else
+    rt_hw_context_switch_to((rt_uintptr_t)&(tid->sp));
+#endif /* RT_USING_SMP */
+}
+
+/*
+ * To deliver a signal to thread, there are cases:
+ * 1. When thread is suspended, function resumes thread and
+ * set signal stat;
+ * 2. When thread is ready:
+ *   - If function delivers a signal to self thread, just handle
+ *    it.
+ *   - If function delivers a signal to another ready thread, OS
+ *    should build a slice context to handle it.
+ */
+static void _signal_deliver(rt_thread_t tid)
+{
+    rt_base_t level;
+
+    level = rt_spin_lock_irqsave(&_thread_signal_lock);
+
+    /* thread is not interested in pended signals */
+    if (!(tid->sig_pending & tid->sig_mask))
+    {
+        rt_spin_unlock_irqrestore(&_thread_signal_lock, level);
+        return;
+    }
+
+    if ((RT_SCHED_CTX(tid).stat & RT_THREAD_SUSPEND_MASK) == RT_THREAD_SUSPEND_MASK)
+    {
+        /* resume thread to handle signal */
+#ifdef RT_USING_SMART
+        rt_thread_wakeup(tid);
+#else
+        rt_thread_resume(tid);
+#endif
+        /* add signal state */
+        RT_SCHED_CTX(tid).stat |= (RT_THREAD_STAT_SIGNAL | RT_THREAD_STAT_SIGNAL_PENDING);
+
+        rt_spin_unlock_irqrestore(&_thread_signal_lock, level);
+
+        /* re-schedule */
+        rt_schedule();
+    }
+    else
+    {
+        if (tid == rt_thread_self())
+        {
+            /* add signal state */
+            RT_SCHED_CTX(tid).stat |= RT_THREAD_STAT_SIGNAL;
+
+            rt_spin_unlock_irqrestore(&_thread_signal_lock, level);
+
+            /* do signal action in self thread context */
+            if (rt_interrupt_get_nest() == 0)
+            {
+                rt_thread_handle_sig(RT_TRUE);
+            }
+        }
+        else if (!((RT_SCHED_CTX(tid).stat & RT_THREAD_STAT_SIGNAL_MASK) & RT_THREAD_STAT_SIGNAL))
+        {
+            /* add signal state */
+            RT_SCHED_CTX(tid).stat |= (RT_THREAD_STAT_SIGNAL | RT_THREAD_STAT_SIGNAL_PENDING);
+
+#ifdef RT_USING_SMP
+            {
+                int cpu_id;
+
+                cpu_id = RT_SCHED_CTX(tid).oncpu;
+                if ((cpu_id != RT_CPU_DETACHED) && (cpu_id != rt_cpu_get_id()))
+                {
+                    rt_uint32_t cpu_mask;
+
+                    cpu_mask = RT_CPU_MASK ^ (1 << cpu_id);
+                    rt_hw_ipi_send(RT_SCHEDULE_IPI, cpu_mask);
+                }
+            }
+#else
+            /* point to the signal handle entry */
+            RT_SCHED_CTX(tid).stat &= ~RT_THREAD_STAT_SIGNAL_PENDING;
+            tid->sig_ret = tid->sp;
+            tid->sp = rt_hw_stack_init((void *)_signal_entry, RT_NULL,
+                                       (void *)((char *)tid->sig_ret - 32), RT_NULL);
+#endif /* RT_USING_SMP */
+
+            rt_spin_unlock_irqrestore(&_thread_signal_lock, level);
+            LOG_D("signal stack pointer @ 0x%08x", tid->sp);
+
+            /* re-schedule */
+            rt_schedule();
+        }
+        else
+        {
+            rt_spin_unlock_irqrestore(&_thread_signal_lock, level);
+        }
+    }
+}
+
+#ifdef RT_USING_SMP
+void *rt_signal_check(void* context)
+{
+    rt_sched_lock_level_t level;
+    int cpu_id;
+    struct rt_cpu* pcpu;
+    struct rt_thread *current_thread;
+
+    level = rt_spin_lock_irqsave(&_thread_signal_lock);
+
+    cpu_id = rt_cpu_get_id();
+    pcpu   = rt_cpu_index(cpu_id);
+    current_thread = pcpu->current_thread;
+
+    if (pcpu->irq_nest)
+    {
+        rt_spin_unlock_irqrestore(&_thread_signal_lock, level);
+        return context;
+    }
+
+    if (current_thread->cpus_lock_nest == 1)
+    {
+        if (RT_SCHED_CTX(current_thread).stat & RT_THREAD_STAT_SIGNAL_PENDING)
+        {
+            void *sig_context;
+
+            RT_SCHED_CTX(current_thread).stat &= ~RT_THREAD_STAT_SIGNAL_PENDING;
+
+            rt_spin_unlock_irqrestore(&_thread_signal_lock, level);
+            sig_context = rt_hw_stack_init((void *)_signal_entry, context,
+                    (void*)((char*)context - 32), RT_NULL);
+            return sig_context;
+        }
+    }
+    rt_spin_unlock_irqrestore(&_thread_signal_lock, level);
+    return context;
+}
+#endif /* RT_USING_SMP */
+
+/**
+ * @brief    This function will install a processing function to a specific
+ *           signal and return the old processing function of this signal.
+ *
+ * @note     This function needs to be used in conjunction with the
+ *           rt_signal_unmask() function to make the signal effective.
+ *
+ * @see      rt_signal_unmask()
+ *
+ * @param    signo is a specific signal value (range: 0 ~ RT_SIG_MAX).
+ *
+ * @param    handler is sets the processing of signal value.
+ *
+ * @return   Return the old processing function of this signal. ONLY When the
+ *           return value is SIG_ERR, the operation is failed.
+ */
+rt_sighandler_t rt_signal_install(int signo, rt_sighandler_t handler)
+{
+    rt_base_t level;
+    rt_sighandler_t old = RT_NULL;
+    rt_thread_t tid = rt_thread_self();
+
+    if (!sig_valid(signo)) return SIG_ERR;
+
+    level = rt_spin_lock_irqsave(&_thread_signal_lock);
+    if (tid->sig_vectors == RT_NULL)
+    {
+        rt_spin_unlock_irqrestore(&_thread_signal_lock, level);
+
+        rt_thread_alloc_sig(tid);
+
+        level = rt_spin_lock_irqsave(&_thread_signal_lock);
+    }
+
+    if (tid->sig_vectors)
+    {
+        old = tid->sig_vectors[signo];
+
+        if (handler == SIG_IGN) tid->sig_vectors[signo] = RT_NULL;
+        else if (handler == SIG_DFL) tid->sig_vectors[signo] = _signal_default_handler;
+        else tid->sig_vectors[signo] = handler;
+    }
+    rt_spin_unlock_irqrestore(&_thread_signal_lock, level);
+
+    return old;
+}
+
+/**
+ * @brief    This function will block the specified signal.
+ *
+ * @note     This function will block the specified signal, even if the
+ *           rt_thread_kill() function is called to send this signal to
+ *           the current thread, it will no longer take effect.
+ *
+ * @see      rt_thread_kill()
+ *
+ * @param    signo is a specific signal value (range: 0 ~ RT_SIG_MAX).
+ */
+void rt_signal_mask(int signo)
+{
+    rt_base_t level;
+    rt_thread_t tid = rt_thread_self();
+
+    level = rt_spin_lock_irqsave(&_thread_signal_lock);
+
+    tid->sig_mask &= ~sig_mask(signo);
+
+    rt_spin_unlock_irqrestore(&_thread_signal_lock, level);
+}
+
+/**
+ * @brief    This function will unblock the specified signal.
+ *
+ * @note     This function will unblock the specified signal. After calling
+ *           the rt_thread_kill() function to send this signal to the current
+ *           thread, it will take effect.
+ *
+ * @see      rt_thread_kill()
+ *
+ * @param    signo is a specific signal value (range: 0 ~ RT_SIG_MAX).
+ */
+void rt_signal_unmask(int signo)
+{
+    rt_base_t level;
+    rt_thread_t tid = rt_thread_self();
+
+    level = rt_spin_lock_irqsave(&_thread_signal_lock);
+
+    tid->sig_mask |= sig_mask(signo);
+
+    /* let thread handle pended signals */
+    if (tid->sig_mask & tid->sig_pending)
+    {
+        rt_spin_unlock_irqrestore(&_thread_signal_lock, level);
+        _signal_deliver(tid);
+    }
+    else
+    {
+        rt_spin_unlock_irqrestore(&_thread_signal_lock, level);
+    }
+}
+
+/**
+ * @brief    This function will wait for the arrival of the set signal. If it does not wait for this signal, the thread will be
+ *           suspended until it waits for this signal or the waiting time exceeds the specified timeout: timeout.
+ *
+ * @param    set is the set of signal values to be waited for. Use the function
+ *           sigaddset() to add the signal.
+ *
+ * @param    si is a pointer to the received signal info. If you don't care about this value, you can use RT_NULL to set.
+ *
+ * @param    timeout is a timeout period (unit: an OS tick).
+ *
+ * @return   Return the operation status. When the return value is RT_EOK, the operation is successful.
+ *           If the return value is any other values, it means that the signal wait failed.
+ */
+int rt_signal_wait(const rt_sigset_t *set, rt_siginfo_t *si, rt_int32_t timeout)
+{
+    int ret = RT_EOK;
+    rt_base_t level;
+    rt_thread_t tid = rt_thread_self();
+    struct siginfo_node *si_node = RT_NULL, *si_prev = RT_NULL;
+
+    /* current context checking */
+    RT_DEBUG_IN_THREAD_CONTEXT;
+
+    /* parameters check */
+    if (set == NULL || *set == 0 || si == NULL )
+    {
+        ret = -RT_EINVAL;
+        goto __done_return;
+    }
+
+    /* clear siginfo to avoid unknown value */
+    memset(si, 0x0, sizeof(rt_siginfo_t));
+
+    level = rt_spin_lock_irqsave(&_thread_signal_lock);
+
+    /* already pending */
+    if (tid->sig_pending & *set) goto __done;
+
+    if (timeout == 0)
+    {
+        ret = -RT_ETIMEOUT;
+        goto __done_int;
+    }
+
+    /* suspend self thread */
+    rt_thread_suspend_with_flag(tid, RT_UNINTERRUPTIBLE);
+    /* set thread stat as waiting for signal */
+    RT_SCHED_CTX(tid).stat |= RT_THREAD_STAT_SIGNAL_WAIT;
+
+    /* start timeout timer */
+    if (timeout != RT_WAITING_FOREVER)
+    {
+        /* reset the timeout of thread timer and start it */
+        rt_timer_control(&(tid->thread_timer),
+                         RT_TIMER_CTRL_SET_TIME,
+                         &timeout);
+        rt_timer_start(&(tid->thread_timer));
+    }
+    rt_spin_unlock_irqrestore(&_thread_signal_lock, level);
+
+    /* do thread scheduling */
+    rt_schedule();
+
+    level = rt_spin_lock_irqsave(&_thread_signal_lock);
+
+    /* remove signal waiting flag */
+    RT_SCHED_CTX(tid).stat &= ~RT_THREAD_STAT_SIGNAL_WAIT;
+
+    /* check errno of thread */
+    if (tid->error == -RT_ETIMEOUT)
+    {
+        tid->error = RT_EOK;
+        rt_spin_unlock_irqrestore(&_thread_signal_lock, level);
+
+        /* timer timeout */
+        ret = -RT_ETIMEOUT;
+        goto __done_return;
+    }
+
+__done:
+    /* to get the first matched pending signals */
+    si_node = (struct siginfo_node *)tid->si_list;
+    while (si_node)
+    {
+        int signo;
+
+        signo = si_node->si.si_signo;
+        if (sig_mask(signo) & *set)
+        {
+            *si  = si_node->si;
+
+            LOG_D("sigwait: %d sig raised!", signo);
+            if (si_prev) si_prev->list.next = si_node->list.next;
+            else
+            {
+                struct siginfo_node *node_next;
+
+                if (si_node->list.next)
+                {
+                    node_next = (void *)rt_slist_entry(si_node->list.next, struct siginfo_node, list);
+                    tid->si_list = node_next;
+                }
+                else
+                {
+                    tid->si_list = RT_NULL;
+                }
+            }
+
+            /* clear pending */
+            tid->sig_pending &= ~sig_mask(signo);
+            rt_mp_free(si_node);
+            break;
+        }
+
+        si_prev = si_node;
+        if (si_node->list.next)
+        {
+            si_node = (void *)rt_slist_entry(si_node->list.next, struct siginfo_node, list);
+        }
+        else
+        {
+            si_node = RT_NULL;
+        }
+     }
+
+__done_int:
+    rt_spin_unlock_irqrestore(&_thread_signal_lock, level);
+
+__done_return:
+    return ret;
+}
+
+void rt_thread_handle_sig(rt_bool_t clean_state)
+{
+    rt_base_t level;
+
+    rt_thread_t tid = rt_thread_self();
+    struct siginfo_node *si_node;
+
+    level = rt_spin_lock_irqsave(&_thread_signal_lock);
+    if (tid->sig_pending & tid->sig_mask)
+    {
+        /* if thread is not waiting for signal */
+        if (!(RT_SCHED_CTX(tid).stat & RT_THREAD_STAT_SIGNAL_WAIT))
+        {
+            while (tid->sig_pending & tid->sig_mask)
+            {
+                int signo, error;
+                rt_sighandler_t handler;
+
+                si_node = (struct siginfo_node *)tid->si_list;
+                if (!si_node) break;
+
+                /* remove this sig info node from list */
+                if (si_node->list.next == RT_NULL)
+                    tid->si_list = RT_NULL;
+                else
+                    tid->si_list = (void *)rt_slist_entry(si_node->list.next, struct siginfo_node, list);
+
+                signo   = si_node->si.si_signo;
+                handler = tid->sig_vectors[signo];
+                tid->sig_pending &= ~sig_mask(signo);
+                rt_spin_unlock_irqrestore(&_thread_signal_lock, level);
+
+                LOG_D("handle signal: %d, handler 0x%08x", signo, handler);
+                if (handler) handler(signo);
+
+                level = rt_spin_lock_irqsave(&_thread_signal_lock);
+                error = -RT_EINTR;
+
+                rt_mp_free(si_node); /* release this siginfo node */
+                /* set errno in thread tcb */
+                tid->error = error;
+            }
+
+            /* whether clean signal status */
+            if (clean_state == RT_TRUE)
+            {
+                RT_SCHED_CTX(tid).stat &= ~RT_THREAD_STAT_SIGNAL;
+            }
+            else
+            {
+                rt_spin_unlock_irqrestore(&_thread_signal_lock, level);
+                return;
+            }
+        }
+    }
+    rt_spin_unlock_irqrestore(&_thread_signal_lock, level);
+}
+
+void rt_thread_alloc_sig(rt_thread_t tid)
+{
+    int index;
+    rt_bool_t need_free = RT_FALSE;
+    rt_base_t level;
+    rt_sighandler_t *vectors;
+
+    vectors = (rt_sighandler_t *)RT_KERNEL_MALLOC(sizeof(rt_sighandler_t) * RT_SIG_MAX);
+    RT_ASSERT(vectors != RT_NULL);
+
+    for (index = 0; index < RT_SIG_MAX; index ++)
+    {
+        vectors[index] = _signal_default_handler;
+    }
+
+    level = rt_spin_lock_irqsave(&_thread_signal_lock);
+
+    if (tid->sig_vectors == RT_NULL)
+    {
+        tid->sig_vectors = vectors;
+    }
+    else
+    {
+        need_free = RT_TRUE;
+    }
+
+    rt_spin_unlock_irqrestore(&_thread_signal_lock, level);
+
+    if (need_free)
+    {
+        rt_free(vectors);
+    }
+}
+
+void rt_thread_free_sig(rt_thread_t tid)
+{
+    rt_base_t level;
+    struct siginfo_node *si_node;
+    rt_sighandler_t *sig_vectors;
+
+    level = rt_spin_lock_irqsave(&_thread_signal_lock);
+    si_node = (struct siginfo_node *)tid->si_list;
+    tid->si_list = RT_NULL;
+
+    sig_vectors = tid->sig_vectors;
+    tid->sig_vectors = RT_NULL;
+    rt_spin_unlock_irqrestore(&_thread_signal_lock, level);
+
+    if (si_node)
+    {
+        struct rt_slist_node *node;
+        struct rt_slist_node *node_to_free;
+
+        LOG_D("free signal info list");
+        node = &(si_node->list);
+        do
+        {
+            node_to_free = node;
+            node = node->next;
+            si_node = rt_slist_entry(node_to_free, struct siginfo_node, list);
+            rt_mp_free(si_node);
+        } while (node);
+    }
+
+    if (sig_vectors)
+    {
+        RT_KERNEL_FREE(sig_vectors);
+    }
+}
+
+/**
+ * @brief    This function can be used to send any signal to any thread.
+ *
+ * @param    tid is a pointer to the thread that receives the signal.
+ *
+ * @param    sig is a specific signal value (range: 0 ~ RT_SIG_MAX).
+ *
+ * @return   Return the operation status. When the return value is RT_EOK, the operation is successful.
+ *           If the return value is any other values, it means that the signal send failed.
+ */
+int rt_thread_kill(rt_thread_t tid, int sig)
+{
+    siginfo_t si;
+    rt_base_t level;
+    struct siginfo_node *si_node;
+
+    RT_ASSERT(tid != RT_NULL);
+    if (!sig_valid(sig)) return -RT_EINVAL;
+
+    LOG_I("send signal: %d", sig);
+    si.si_signo = sig;
+    si.si_code  = SI_USER;
+    si.si_value.sival_ptr = RT_NULL;
+
+    level = rt_spin_lock_irqsave(&_thread_signal_lock);
+    if (tid->sig_pending & sig_mask(sig))
+    {
+        /* whether already emits this signal? */
+        struct rt_slist_node *node;
+        struct siginfo_node  *entry;
+
+        si_node = (struct siginfo_node *)tid->si_list;
+        if (si_node)
+            node = (struct rt_slist_node *)&si_node->list;
+        else
+            node = RT_NULL;
+
+        /* update sig info */
+        for (; (node) != RT_NULL; node = node->next)
+        {
+            entry = rt_slist_entry(node, struct siginfo_node, list);
+            if (entry->si.si_signo == sig)
+            {
+                memcpy(&(entry->si), &si, sizeof(siginfo_t));
+                rt_spin_unlock_irqrestore(&_thread_signal_lock, level);
+                return 0;
+            }
+        }
+    }
+    rt_spin_unlock_irqrestore(&_thread_signal_lock, level);
+
+    si_node = (struct siginfo_node *) rt_mp_alloc(_siginfo_pool, 0);
+    if (si_node)
+    {
+        rt_slist_init(&(si_node->list));
+        memcpy(&(si_node->si), &si, sizeof(siginfo_t));
+
+        level = rt_spin_lock_irqsave(&_thread_signal_lock);
+
+        if (tid->si_list)
+        {
+            struct siginfo_node *si_list;
+
+            si_list = (struct siginfo_node *)tid->si_list;
+            rt_slist_append(&(si_list->list), &(si_node->list));
+        }
+        else
+        {
+            tid->si_list = si_node;
+        }
+
+        /* a new signal */
+        tid->sig_pending |= sig_mask(sig);
+
+        rt_spin_unlock_irqrestore(&_thread_signal_lock, level);
+    }
+    else
+    {
+        LOG_E("The allocation of signal info node failed.");
+        return -RT_EEMPTY;
+    }
+
+    /* deliver signal to this thread */
+    _signal_deliver(tid);
+
+    return RT_EOK;
+}
+
+int rt_system_signal_init(void)
+{
+    _siginfo_pool = rt_mp_create("signal", RT_SIG_INFO_MAX, sizeof(struct siginfo_node));
+    if (_siginfo_pool == RT_NULL)
+    {
+        LOG_E("create memory pool for signal info failed.");
+        RT_ASSERT(0);
+    }
+
+    return 0;
+}
+
+#endif /* RT_USING_SIGNALS */

rt-thread/src/slab.c

@@ -0,0 +1,856 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*
+ * File      : slab.c
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2008-07-12     Bernard      the first version
+ * 2010-07-13     Bernard      fix RT_ALIGN issue found by kuronca
+ * 2010-10-23     yi.qiu       add module memory allocator
+ * 2010-12-18     yi.qiu       fix zone release bug
+ */
+
+/*
+ * KERN_SLABALLOC.C - Kernel SLAB memory allocator
+ *
+ * Copyright (c) 2003,2004 The DragonFly Project.  All rights reserved.
+ *
+ * This code is derived from software contributed to The DragonFly Project
+ * by Matthew Dillon <dillon@backplane.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name of The DragonFly Project nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific, prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+
+#include <rthw.h>
+#include <rtthread.h>
+
+#ifdef RT_USING_SLAB
+
+#define DBG_TAG           "kernel.slab"
+#define DBG_LVL           DBG_INFO
+#include <rtdbg.h>
+
+/*
+ * slab allocator implementation
+ *
+ * A slab allocator reserves a ZONE for each chunk size, then lays the
+ * chunks out in an array within the zone.  Allocation and deallocation
+ * is nearly instantanious, and fragmentation/overhead losses are limited
+ * to a fixed worst-case amount.
+ *
+ * The downside of this slab implementation is in the chunk size
+ * multiplied by the number of zones.  ~80 zones * 128K = 10MB of VM per cpu.
+ * In a kernel implementation all this memory will be physical so
+ * the zone size is adjusted downward on machines with less physical
+ * memory.  The upside is that overhead is bounded... this is the *worst*
+ * case overhead.
+ *
+ * Slab management is done on a per-cpu basis and no locking or mutexes
+ * are required, only a critical section.  When one cpu frees memory
+ * belonging to another cpu's slab manager an asynchronous IPI message
+ * will be queued to execute the operation.   In addition, both the
+ * high level slab allocator and the low level zone allocator optimize
+ * M_ZERO requests, and the slab allocator does not have to pre initialize
+ * the linked list of chunks.
+ *
+ * XXX Balancing is needed between cpus.  Balance will be handled through
+ * asynchronous IPIs primarily by reassigning the z_Cpu ownership of chunks.
+ *
+ * XXX If we have to allocate a new zone and M_USE_RESERVE is set, use of
+ * the new zone should be restricted to M_USE_RESERVE requests only.
+ *
+ *  Alloc Size  Chunking        Number of zones
+ *  0-127       8               16
+ *  128-255     16              8
+ *  256-511     32              8
+ *  512-1023    64              8
+ *  1024-2047   128             8
+ *  2048-4095   256             8
+ *  4096-8191   512             8
+ *  8192-16383  1024            8
+ *  16384-32767 2048            8
+ *  (if RT_MM_PAGE_SIZE is 4K the maximum zone allocation is 16383)
+ *
+ *  Allocations >= zone_limit go directly to kmem.
+ *
+ *          API REQUIREMENTS AND SIDE EFFECTS
+ *
+ *    To operate as a drop-in replacement to the FreeBSD-4.x malloc() we
+ *    have remained compatible with the following API requirements:
+ *
+ *    + small power-of-2 sized allocations are power-of-2 aligned (kern_tty)
+ *    + all power-of-2 sized allocations are power-of-2 aligned (twe)
+ *    + malloc(0) is allowed and returns non-RT_NULL (ahc driver)
+ *    + ability to allocate arbitrarily large chunks of memory
+ */
+
+#define ZALLOC_SLAB_MAGIC       0x51ab51ab
+#define ZALLOC_ZONE_LIMIT       (16 * 1024)     /* max slab-managed alloc */
+#define ZALLOC_MIN_ZONE_SIZE    (32 * 1024)     /* minimum zone size */
+#define ZALLOC_MAX_ZONE_SIZE    (128 * 1024)    /* maximum zone size */
+#define ZONE_RELEASE_THRESH     2               /* threshold number of zones */
+
+/*
+ * Misc constants.  Note that allocations that are exact multiples of
+ * RT_MM_PAGE_SIZE, or exceed the zone limit, fall through to the kmem module.
+ */
+#define MIN_CHUNK_SIZE      8       /* in bytes */
+#define MIN_CHUNK_MASK      (MIN_CHUNK_SIZE - 1)
+
+/*
+ * Array of descriptors that describe the contents of each page
+ */
+#define PAGE_TYPE_FREE      0x00
+#define PAGE_TYPE_SMALL     0x01
+#define PAGE_TYPE_LARGE     0x02
+
+#define btokup(addr)    \
+    (&slab->memusage[((rt_uintptr_t)(addr) - slab->heap_start) >> RT_MM_PAGE_BITS])
+
+/**
+ * Base structure of slab memory object
+ */
+
+/*
+ * The IN-BAND zone header is placed at the beginning of each zone.
+ */
+struct rt_slab_zone
+{
+    rt_uint32_t  z_magic;                    /**< magic number for sanity check */
+    rt_uint32_t  z_nfree;                    /**< total free chunks / ualloc space in zone */
+    rt_uint32_t  z_nmax;                     /**< maximum free chunks */
+    struct rt_slab_zone *z_next;            /**< zoneary[] link if z_nfree non-zero */
+    rt_uint8_t  *z_baseptr;                 /**< pointer to start of chunk array */
+
+    rt_uint32_t  z_uindex;                   /**< current initial allocation index */
+    rt_uint32_t  z_chunksize;                /**< chunk size for validation */
+
+    rt_uint32_t  z_zoneindex;                /**< zone index */
+    struct rt_slab_chunk  *z_freechunk;     /**< free chunk list */
+};
+
+/*
+ * Chunk structure for free elements
+ */
+struct rt_slab_chunk
+{
+    struct rt_slab_chunk *c_next;
+};
+
+struct rt_slab_memusage
+{
+    rt_uint32_t     type: 2 ;               /**< page type */
+    rt_uint32_t     size: 30;               /**< pages allocated or offset from zone */
+};
+
+/*
+ * slab page allocator
+ */
+struct rt_slab_page
+{
+    struct rt_slab_page *next;      /**< next valid page */
+    rt_size_t page;                 /**< number of page  */
+
+    /* dummy */
+    char dummy[RT_MM_PAGE_SIZE - (sizeof(struct rt_slab_page *) + sizeof(rt_size_t))];
+};
+
+#define RT_SLAB_NZONES                  72              /* number of zones */
+
+/*
+ * slab object
+ */
+struct rt_slab
+{
+    struct rt_memory            parent;                         /**< inherit from rt_memory */
+    rt_uintptr_t                heap_start;                     /**< memory start address */
+    rt_uintptr_t                heap_end;                       /**< memory end address */
+    struct rt_slab_memusage    *memusage;
+    struct rt_slab_zone        *zone_array[RT_SLAB_NZONES];     /* linked list of zones NFree > 0 */
+    struct rt_slab_zone        *zone_free;                      /* whole zones that have become free */
+    rt_uint32_t                 zone_free_cnt;
+    rt_uint32_t                 zone_size;
+    rt_uint32_t                 zone_limit;
+    rt_uint32_t                 zone_page_cnt;
+    struct rt_slab_page        *page_list;
+};
+
+/**
+ * @brief Alloc memory size by page.
+ *
+ * @param m the slab memory management object.
+ *
+ * @param npages the number of pages.
+ */
+void *rt_slab_page_alloc(rt_slab_t m, rt_size_t npages)
+{
+    struct rt_slab_page *b, *n;
+    struct rt_slab_page **prev;
+    struct rt_slab *slab = (struct rt_slab *)m;
+
+    if (npages == 0)
+        return RT_NULL;
+
+    for (prev = &slab->page_list; (b = *prev) != RT_NULL; prev = &(b->next))
+    {
+        if (b->page > npages)
+        {
+            /* splite pages */
+            n       = b + npages;
+            n->next = b->next;
+            n->page = b->page - npages;
+            *prev   = n;
+            break;
+        }
+
+        if (b->page == npages)
+        {
+            /* this node fit, remove this node */
+            *prev = b->next;
+            break;
+        }
+    }
+
+    return b;
+}
+
+/**
+ * @brief Free memory by page.
+ *
+ * @param m the slab memory management object.
+ *
+ * @param addr is the head address of first page.
+ *
+ * @param npages is the number of pages.
+ */
+void rt_slab_page_free(rt_slab_t m, void *addr, rt_size_t npages)
+{
+    struct rt_slab_page *b, *n;
+    struct rt_slab_page **prev;
+    struct rt_slab *slab = (struct rt_slab *)m;
+
+    RT_ASSERT(addr != RT_NULL);
+    RT_ASSERT((rt_uintptr_t)addr % RT_MM_PAGE_SIZE == 0);
+    RT_ASSERT(npages != 0);
+
+    n = (struct rt_slab_page *)addr;
+
+    for (prev = &slab->page_list; (b = *prev) != RT_NULL; prev = &(b->next))
+    {
+        RT_ASSERT(b->page > 0);
+        RT_ASSERT(b > n || b + b->page <= n);
+
+        if (b + b->page == n)
+        {
+            if (b + (b->page += npages) == b->next)
+            {
+                b->page += b->next->page;
+                b->next  = b->next->next;
+            }
+            return;
+        }
+
+        if (b == n + npages)
+        {
+            n->page = b->page + npages;
+            n->next = b->next;
+            *prev   = n;
+            return;
+        }
+
+        if (b > n + npages)
+            break;
+    }
+
+    n->page = npages;
+    n->next = b;
+    *prev   = n;
+}
+
+/*
+ * Initialize the page allocator
+ */
+static void rt_slab_page_init(struct rt_slab *slab, void *addr, rt_size_t npages)
+{
+    RT_ASSERT(addr != RT_NULL);
+    RT_ASSERT(npages != 0);
+
+    slab->page_list = RT_NULL;
+    rt_slab_page_free((rt_slab_t)(&slab->parent), addr, npages);
+}
+
+/**
+ * @brief This function will init slab memory management algorithm
+ *
+ * @param name is the name of the slab memory management object.
+ *
+ * @param begin_addr the beginning address of system page.
+ *
+ * @param size is the size of the memory.
+ *
+ * @return Return a pointer to the slab memory object.
+ */
+rt_slab_t rt_slab_init(const char *name, void *begin_addr, rt_size_t size)
+{
+    rt_uint32_t limsize, npages;
+    rt_uintptr_t start_addr, begin_align, end_align;
+    struct rt_slab *slab;
+
+    slab = (struct rt_slab *)RT_ALIGN((rt_uintptr_t)begin_addr, RT_ALIGN_SIZE);
+    start_addr = (rt_uintptr_t)slab + sizeof(*slab);
+    /* align begin and end addr to page */
+    begin_align = RT_ALIGN((rt_uintptr_t)start_addr, RT_MM_PAGE_SIZE);
+    end_align   = RT_ALIGN_DOWN((rt_uintptr_t)begin_addr + size, RT_MM_PAGE_SIZE);
+    if (begin_align >= end_align)
+    {
+        rt_kprintf("slab init errr. wrong address[0x%x - 0x%x]\n",
+                   (rt_uintptr_t)begin_addr, (rt_uintptr_t)begin_addr + size);
+        return RT_NULL;
+    }
+
+    limsize = end_align - begin_align;
+    npages  = limsize / RT_MM_PAGE_SIZE;
+    LOG_D("heap[0x%x - 0x%x], size 0x%x, 0x%x pages",
+          begin_align, end_align, limsize, npages);
+
+    rt_memset(slab, 0, sizeof(*slab));
+    /* initialize slab memory object */
+    rt_object_init(&(slab->parent.parent), RT_Object_Class_Memory, name);
+    slab->parent.algorithm = "slab";
+    slab->parent.address = begin_align;
+    slab->parent.total = limsize;
+    slab->parent.used = 0;
+    slab->parent.max = 0;
+    slab->heap_start = begin_align;
+    slab->heap_end = end_align;
+
+    /* init pages */
+    rt_slab_page_init(slab, (void *)slab->heap_start, npages);
+
+    /* calculate zone size */
+    slab->zone_size = ZALLOC_MIN_ZONE_SIZE;
+    while (slab->zone_size < ZALLOC_MAX_ZONE_SIZE && (slab->zone_size << 1) < (limsize / 1024))
+        slab->zone_size <<= 1;
+
+    slab->zone_limit = slab->zone_size / 4;
+    if (slab->zone_limit > ZALLOC_ZONE_LIMIT)
+        slab->zone_limit = ZALLOC_ZONE_LIMIT;
+
+    slab->zone_page_cnt = slab->zone_size / RT_MM_PAGE_SIZE;
+
+    LOG_D("zone size 0x%x, zone page count 0x%x",
+          slab->zone_size, slab->zone_page_cnt);
+
+    /* allocate slab->memusage array */
+    limsize  = npages * sizeof(struct rt_slab_memusage);
+    limsize  = RT_ALIGN(limsize, RT_MM_PAGE_SIZE);
+    slab->memusage = rt_slab_page_alloc((rt_slab_t)(&slab->parent), limsize / RT_MM_PAGE_SIZE);
+
+    LOG_D("slab->memusage 0x%x, size 0x%x",
+          (rt_uintptr_t)slab->memusage, limsize);
+    return &slab->parent;
+}
+RTM_EXPORT(rt_slab_init);
+
+/**
+ * @brief This function will remove a slab object from the system.
+ *
+ * @param m the slab memory management object.
+ *
+ * @return RT_EOK
+ */
+rt_err_t rt_slab_detach(rt_slab_t m)
+{
+    struct rt_slab *slab = (struct rt_slab *)m;
+
+    RT_ASSERT(slab != RT_NULL);
+    RT_ASSERT(rt_object_get_type(&slab->parent.parent) == RT_Object_Class_Memory);
+    RT_ASSERT(rt_object_is_systemobject(&slab->parent.parent));
+
+    rt_object_detach(&(slab->parent.parent));
+
+    return RT_EOK;
+}
+RTM_EXPORT(rt_slab_detach);
+
+/*
+ * Calculate the zone index for the allocation request size and set the
+ * allocation request size to that particular zone's chunk size.
+ */
+rt_inline int zoneindex(rt_size_t *bytes)
+{
+    /* unsigned for shift opt */
+    rt_uintptr_t n = (rt_uintptr_t)(*bytes);
+
+    if (n < 128)
+    {
+        *bytes = n = (n + 7) & ~7;
+
+        /* 8 byte chunks, 16 zones */
+        return (n / 8 - 1);
+    }
+    if (n < 256)
+    {
+        *bytes = n = (n + 15) & ~15;
+
+        return (n / 16 + 7);
+    }
+    if (n < 8192)
+    {
+        if (n < 512)
+        {
+            *bytes = n = (n + 31) & ~31;
+
+            return (n / 32 + 15);
+        }
+        if (n < 1024)
+        {
+            *bytes = n = (n + 63) & ~63;
+
+            return (n / 64 + 23);
+        }
+        if (n < 2048)
+        {
+            *bytes = n = (n + 127) & ~127;
+
+            return (n / 128 + 31);
+        }
+        if (n < 4096)
+        {
+            *bytes = n = (n + 255) & ~255;
+
+            return (n / 256 + 39);
+        }
+        *bytes = n = (n + 511) & ~511;
+
+        return (n / 512 + 47);
+    }
+    if (n < 16384)
+    {
+        *bytes = n = (n + 1023) & ~1023;
+
+        return (n / 1024 + 55);
+    }
+
+    rt_kprintf("Unexpected byte count %d", n);
+
+    return 0;
+}
+
+/**
+ * @addtogroup group_memory_management
+ */
+
+/**@{*/
+
+/**
+ * @brief This function will allocate a block from slab object.
+ *
+ * @note the RT_NULL is returned if
+ *         - the nbytes is less than zero.
+ *         - there is no nbytes sized memory valid in system.
+ *
+ * @param m the slab memory management object.
+ *
+ * @param size is the size of memory to be allocated.
+ *
+ * @return the allocated memory.
+ */
+void *rt_slab_alloc(rt_slab_t m, rt_size_t size)
+{
+    struct rt_slab_zone *z;
+    rt_int32_t zi;
+    struct rt_slab_chunk *chunk;
+    struct rt_slab_memusage *kup;
+    struct rt_slab *slab = (struct rt_slab *)m;
+
+    /* zero size, return RT_NULL */
+    if (size == 0)
+        return RT_NULL;
+
+    /*
+     * Handle large allocations directly.  There should not be very many of
+     * these so performance is not a big issue.
+     */
+    if (size >= slab->zone_limit)
+    {
+        size = RT_ALIGN(size, RT_MM_PAGE_SIZE);
+
+        chunk = rt_slab_page_alloc(m, size >> RT_MM_PAGE_BITS);
+        if (chunk == RT_NULL)
+            return RT_NULL;
+
+        /* set kup */
+        kup = btokup(chunk);
+        kup->type = PAGE_TYPE_LARGE;
+        kup->size = size >> RT_MM_PAGE_BITS;
+
+        LOG_D("alloc a large memory 0x%x, page cnt %d, kup %d",
+              size,
+              size >> RT_MM_PAGE_BITS,
+              ((rt_uintptr_t)chunk - slab->heap_start) >> RT_MM_PAGE_BITS);
+        /* mem stat */
+        slab->parent.used += size;
+        if (slab->parent.used > slab->parent.max)
+            slab->parent.max = slab->parent.used;
+        return chunk;
+    }
+
+    /*
+     * Attempt to allocate out of an existing zone.  First try the free list,
+     * then allocate out of unallocated space.  If we find a good zone move
+     * it to the head of the list so later allocations find it quickly
+     * (we might have thousands of zones in the list).
+     *
+     * Note: zoneindex() will panic of size is too large.
+     */
+    zi = zoneindex(&size);
+    RT_ASSERT(zi < RT_SLAB_NZONES);
+
+    LOG_D("try to alloc 0x%x on zone: %d", size, zi);
+
+    if ((z = slab->zone_array[zi]) != RT_NULL)
+    {
+        RT_ASSERT(z->z_nfree > 0);
+
+        /* Remove us from the zone_array[] when we become full */
+        if (--z->z_nfree == 0)
+        {
+            slab->zone_array[zi] = z->z_next;
+            z->z_next = RT_NULL;
+        }
+
+        /*
+         * No chunks are available but nfree said we had some memory, so
+         * it must be available in the never-before-used-memory area
+         * governed by uindex.  The consequences are very serious if our zone
+         * got corrupted so we use an explicit rt_kprintf rather then a KASSERT.
+         */
+        if (z->z_uindex + 1 != z->z_nmax)
+        {
+            z->z_uindex = z->z_uindex + 1;
+            chunk = (struct rt_slab_chunk *)(z->z_baseptr + z->z_uindex * size);
+        }
+        else
+        {
+            /* find on free chunk list */
+            chunk = z->z_freechunk;
+
+            /* remove this chunk from list */
+            z->z_freechunk = z->z_freechunk->c_next;
+        }
+        /* mem stats */
+        slab->parent.used += z->z_chunksize;
+        if (slab->parent.used > slab->parent.max)
+            slab->parent.max = slab->parent.used;
+
+        return chunk;
+    }
+
+    /*
+     * If all zones are exhausted we need to allocate a new zone for this
+     * index.
+     *
+     * At least one subsystem, the tty code (see CROUND) expects power-of-2
+     * allocations to be power-of-2 aligned.  We maintain compatibility by
+     * adjusting the base offset below.
+     */
+    {
+        rt_uint32_t off;
+
+        if ((z = slab->zone_free) != RT_NULL)
+        {
+            /* remove zone from free zone list */
+            slab->zone_free = z->z_next;
+            -- slab->zone_free_cnt;
+        }
+        else
+        {
+            /* allocate a zone from page */
+            z = rt_slab_page_alloc(m, slab->zone_size / RT_MM_PAGE_SIZE);
+            if (z == RT_NULL)
+            {
+                return RT_NULL;
+            }
+
+            LOG_D("alloc a new zone: 0x%x",
+                  (rt_uintptr_t)z);
+
+            /* set message usage */
+            for (off = 0, kup = btokup(z); off < slab->zone_page_cnt; off ++)
+            {
+                kup->type = PAGE_TYPE_SMALL;
+                kup->size = off;
+
+                kup ++;
+            }
+        }
+
+        /* clear to zero */
+        rt_memset(z, 0, sizeof(struct rt_slab_zone));
+
+        /* offset of slab zone struct in zone */
+        off = sizeof(struct rt_slab_zone);
+
+        /*
+         * Guarentee power-of-2 alignment for power-of-2-sized chunks.
+         * Otherwise just 8-byte align the data.
+         */
+        if ((size | (size - 1)) + 1 == (size << 1))
+            off = (off + size - 1) & ~(size - 1);
+        else
+            off = (off + MIN_CHUNK_MASK) & ~MIN_CHUNK_MASK;
+
+        z->z_magic     = ZALLOC_SLAB_MAGIC;
+        z->z_zoneindex = zi;
+        z->z_nmax      = (slab->zone_size - off) / size;
+        z->z_nfree     = z->z_nmax - 1;
+        z->z_baseptr   = (rt_uint8_t *)z + off;
+        z->z_uindex    = 0;
+        z->z_chunksize = size;
+
+        chunk = (struct rt_slab_chunk *)(z->z_baseptr + z->z_uindex * size);
+
+        /* link to zone array */
+        z->z_next = slab->zone_array[zi];
+        slab->zone_array[zi] = z;
+        /* mem stats */
+        slab->parent.used += z->z_chunksize;
+        if (slab->parent.used > slab->parent.max)
+            slab->parent.max = slab->parent.used;
+    }
+
+    return chunk;
+}
+RTM_EXPORT(rt_slab_alloc);
+
+/**
+ * @brief This function will change the size of previously allocated memory block.
+ *
+ * @param m the slab memory management object.
+ *
+ * @param ptr is the previously allocated memory block.
+ *
+ * @param size is the new size of memory block.
+ *
+ * @return the allocated memory.
+ */
+void *rt_slab_realloc(rt_slab_t m, void *ptr, rt_size_t size)
+{
+    void *nptr;
+    struct rt_slab_zone *z;
+    struct rt_slab_memusage *kup;
+    struct rt_slab *slab = (struct rt_slab *)m;
+
+    if (ptr == RT_NULL)
+        return rt_slab_alloc(m, size);
+
+    if (size == 0)
+    {
+        rt_slab_free(m, ptr);
+        return RT_NULL;
+    }
+
+    /*
+     * Get the original allocation's zone.  If the new request winds up
+     * using the same chunk size we do not have to do anything.
+     */
+    kup = btokup((rt_uintptr_t)ptr & ~RT_MM_PAGE_MASK);
+    if (kup->type == PAGE_TYPE_LARGE)
+    {
+        rt_size_t osize;
+
+        osize = kup->size << RT_MM_PAGE_BITS;
+        if ((nptr = rt_slab_alloc(m, size)) == RT_NULL)
+            return RT_NULL;
+        rt_memcpy(nptr, ptr, size > osize ? osize : size);
+        rt_slab_free(m, ptr);
+
+        return nptr;
+    }
+    else if (kup->type == PAGE_TYPE_SMALL)
+    {
+        z = (struct rt_slab_zone *)(((rt_uintptr_t)ptr & ~RT_MM_PAGE_MASK) -
+                          kup->size * RT_MM_PAGE_SIZE);
+        RT_ASSERT(z->z_magic == ZALLOC_SLAB_MAGIC);
+
+        zoneindex(&size);
+        if (z->z_chunksize == size)
+            return (ptr); /* same chunk */
+
+        /*
+         * Allocate memory for the new request size.  Note that zoneindex has
+         * already adjusted the request size to the appropriate chunk size, which
+         * should optimize our bcopy().  Then copy and return the new pointer.
+         */
+        if ((nptr = rt_slab_alloc(m, size)) == RT_NULL)
+            return RT_NULL;
+
+        rt_memcpy(nptr, ptr, size > z->z_chunksize ? z->z_chunksize : size);
+        rt_slab_free(m, ptr);
+
+        return nptr;
+    }
+
+    return RT_NULL;
+}
+RTM_EXPORT(rt_slab_realloc);
+
+/**
+ * @brief This function will release the previous allocated memory block by rt_slab_alloc.
+ *
+ * @note The released memory block is taken back to system heap.
+ *
+ * @param m the slab memory management object.
+ * @param ptr is the address of memory which will be released
+ */
+void rt_slab_free(rt_slab_t m, void *ptr)
+{
+    struct rt_slab_zone *z;
+    struct rt_slab_chunk *chunk;
+    struct rt_slab_memusage *kup;
+    struct rt_slab *slab = (struct rt_slab *)m;
+
+    /* free a RT_NULL pointer */
+    if (ptr == RT_NULL)
+        return ;
+
+    /* get memory usage */
+#if (DBG_LVL == DBG_LOG)
+    {
+        rt_uintptr_t addr = ((rt_uintptr_t)ptr & ~RT_MM_PAGE_MASK);
+        LOG_D("free a memory 0x%x and align to 0x%x, kup index %d",
+              (rt_uintptr_t)ptr,
+              (rt_uintptr_t)addr,
+              ((rt_uintptr_t)(addr) - slab->heap_start) >> RT_MM_PAGE_BITS);
+    }
+#endif /* DBG_LVL == DBG_LOG */
+
+    kup = btokup((rt_uintptr_t)ptr & ~RT_MM_PAGE_MASK);
+    /* release large allocation */
+    if (kup->type == PAGE_TYPE_LARGE)
+    {
+        rt_uintptr_t size;
+
+        /* clear page counter */
+        size = kup->size;
+        kup->size = 0;
+        /* mem stats */
+        slab->parent.used -= size * RT_MM_PAGE_SIZE;
+
+        LOG_D("free large memory block 0x%x, page count %d",
+              (rt_uintptr_t)ptr, size);
+
+        /* free this page */
+        rt_slab_page_free(m, ptr, size);
+
+        return;
+    }
+
+    /* zone case. get out zone. */
+    z = (struct rt_slab_zone *)(((rt_uintptr_t)ptr & ~RT_MM_PAGE_MASK) -
+                      kup->size * RT_MM_PAGE_SIZE);
+    RT_ASSERT(z->z_magic == ZALLOC_SLAB_MAGIC);
+
+    chunk          = (struct rt_slab_chunk *)ptr;
+    chunk->c_next  = z->z_freechunk;
+    z->z_freechunk = chunk;
+    /* mem stats */
+    slab->parent.used -= z->z_chunksize;
+
+    /*
+     * Bump the number of free chunks.  If it becomes non-zero the zone
+     * must be added back onto the appropriate list.
+     */
+    if (z->z_nfree++ == 0)
+    {
+        z->z_next = slab->zone_array[z->z_zoneindex];
+        slab->zone_array[z->z_zoneindex] = z;
+    }
+
+    /*
+     * If the zone becomes totally free, and there are other zones we
+     * can allocate from, move this zone to the FreeZones list.  Since
+     * this code can be called from an IPI callback, do *NOT* try to mess
+     * with kernel_map here.  Hysteresis will be performed at malloc() time.
+     */
+    if (z->z_nfree == z->z_nmax &&
+        (z->z_next || slab->zone_array[z->z_zoneindex] != z))
+    {
+        struct rt_slab_zone **pz;
+
+        LOG_D("free zone %#x, zoneindex %d",
+              (rt_uintptr_t)z, z->z_zoneindex);
+
+        /* remove zone from zone array list */
+        for (pz = &slab->zone_array[z->z_zoneindex]; z != *pz; pz = &(*pz)->z_next)
+            ;
+        *pz = z->z_next;
+
+        /* reset zone */
+        z->z_magic = RT_UINT32_MAX;
+
+        /* insert to free zone list */
+        z->z_next = slab->zone_free;
+        slab->zone_free = z;
+
+        ++ slab->zone_free_cnt;
+
+        /* release zone to page allocator */
+        if (slab->zone_free_cnt > ZONE_RELEASE_THRESH)
+        {
+            register rt_uint32_t i;
+
+            z         = slab->zone_free;
+            slab->zone_free = z->z_next;
+            -- slab->zone_free_cnt;
+
+            /* set message usage */
+            for (i = 0, kup = btokup(z); i < slab->zone_page_cnt; i ++)
+            {
+                kup->type = PAGE_TYPE_FREE;
+                kup->size = 0;
+                kup ++;
+            }
+
+            /* release pages */
+            rt_slab_page_free(m, z, slab->zone_size / RT_MM_PAGE_SIZE);
+
+            return;
+        }
+    }
+}
+RTM_EXPORT(rt_slab_free);
+
+#endif /* RT_USING_SLAB */

rt-thread/src/timer.c

@@ -0,0 +1,871 @@
+/*
+ * Copyright (c) 2006-2024, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2006-03-12     Bernard      first version
+ * 2006-04-29     Bernard      implement thread timer
+ * 2006-06-04     Bernard      implement rt_timer_control
+ * 2006-08-10     Bernard      fix the periodic timer bug
+ * 2006-09-03     Bernard      implement rt_timer_detach
+ * 2009-11-11     LiJin        add soft timer
+ * 2010-05-12     Bernard      fix the timer check bug.
+ * 2010-11-02     Charlie      re-implement tick overflow issue
+ * 2012-12-15     Bernard      fix the next timeout issue in soft timer
+ * 2014-07-12     Bernard      does not lock scheduler when invoking soft-timer
+ *                             timeout function.
+ * 2021-08-15     supperthomas add the comment
+ * 2022-01-07     Gabriel      Moving __on_rt_xxxxx_hook to timer.c
+ * 2022-04-19     Stanley      Correct descriptions
+ * 2023-09-15     xqyjlj       perf rt_hw_interrupt_disable/enable
+ * 2024-01-25     Shell        add RT_TIMER_FLAG_THREAD_TIMER for timer to sync with sched
+ * 2024-05-01     wdfk-prog    The rt_timer_check and _soft_timer_check functions are merged
+ */
+
+#include <rtthread.h>
+#include <rthw.h>
+
+#define DBG_TAG           "kernel.timer"
+#define DBG_LVL           DBG_INFO
+#include <rtdbg.h>
+
+#ifndef RT_USING_TIMER_ALL_SOFT
+/* hard timer list */
+static rt_list_t _timer_list[RT_TIMER_SKIP_LIST_LEVEL];
+static struct rt_spinlock _htimer_lock;
+#endif
+
+#ifdef RT_USING_TIMER_SOFT
+
+#ifndef RT_TIMER_THREAD_STACK_SIZE
+#define RT_TIMER_THREAD_STACK_SIZE     512
+#endif /* RT_TIMER_THREAD_STACK_SIZE */
+
+#ifndef RT_TIMER_THREAD_PRIO
+#define RT_TIMER_THREAD_PRIO           0
+#endif /* RT_TIMER_THREAD_PRIO */
+
+/* soft timer list */
+static rt_list_t _soft_timer_list[RT_TIMER_SKIP_LIST_LEVEL];
+static struct rt_spinlock _stimer_lock;
+static struct rt_thread _timer_thread;
+static struct rt_semaphore _soft_timer_sem;
+rt_align(RT_ALIGN_SIZE)
+static rt_uint8_t _timer_thread_stack[RT_TIMER_THREAD_STACK_SIZE];
+#endif /* RT_USING_TIMER_SOFT */
+
+#if defined(RT_USING_HOOK) && defined(RT_HOOK_USING_FUNC_PTR)
+extern void (*rt_object_take_hook)(struct rt_object *object);
+extern void (*rt_object_put_hook)(struct rt_object *object);
+static void (*rt_timer_enter_hook)(struct rt_timer *timer);
+static void (*rt_timer_exit_hook)(struct rt_timer *timer);
+
+/**
+ * @addtogroup group_hook
+ */
+
+/**@{*/
+
+/**
+ * @brief This function will set a hook function on timer,
+ *        which will be invoked when enter timer timeout callback function.
+ *
+ * @param hook is the function point of timer
+ */
+void rt_timer_enter_sethook(void (*hook)(struct rt_timer *timer))
+{
+    rt_timer_enter_hook = hook;
+}
+
+/**
+ * @brief This function will set a hook function, which will be
+ *        invoked when exit timer timeout callback function.
+ *
+ * @param hook is the function point of timer
+ */
+void rt_timer_exit_sethook(void (*hook)(struct rt_timer *timer))
+{
+    rt_timer_exit_hook = hook;
+}
+
+/**@}*/
+#endif /* RT_USING_HOOK */
+
+rt_inline struct rt_spinlock* _timerlock_idx(struct rt_timer *timer)
+{
+#ifdef RT_USING_TIMER_ALL_SOFT
+    return &_stimer_lock;
+#else
+#ifdef RT_USING_TIMER_SOFT
+    if (timer->parent.flag & RT_TIMER_FLAG_SOFT_TIMER)
+    {
+        return &_stimer_lock;
+    }
+    else
+#endif /* RT_USING_TIMER_SOFT */
+    {
+        return &_htimer_lock;
+    }
+#endif
+}
+
+/**
+ * @brief [internal] The init funtion of timer
+ *
+ *        The internal called function of rt_timer_init
+ *
+ * @see rt_timer_init
+ *
+ * @param timer is timer object
+ *
+ * @param timeout is the timeout function
+ *
+ * @param parameter is the parameter of timeout function
+ *
+ * @param time is the tick of timer
+ *
+ * @param flag the flag of timer
+ */
+static void _timer_init(rt_timer_t timer,
+                        void (*timeout)(void *parameter),
+                        void      *parameter,
+                        rt_tick_t  time,
+                        rt_uint8_t flag)
+{
+    int i;
+
+#ifdef RT_USING_TIMER_ALL_SOFT
+    flag               |= RT_TIMER_FLAG_SOFT_TIMER;
+#endif
+
+    /* set flag */
+    timer->parent.flag  = flag;
+
+    /* set deactivated */
+    timer->parent.flag &= ~RT_TIMER_FLAG_ACTIVATED;
+
+    timer->timeout_func = timeout;
+    timer->parameter    = parameter;
+
+    timer->timeout_tick = 0;
+    timer->init_tick    = time;
+
+    /* initialize timer list */
+    for (i = 0; i < RT_TIMER_SKIP_LIST_LEVEL; i++)
+    {
+        rt_list_init(&(timer->row[i]));
+    }
+}
+
+/**
+ * @brief  Find the next emtpy timer ticks
+ *
+ * @param timer_list is the array of time list
+ *
+ * @param timeout_tick is the next timer's ticks
+ *
+ * @return  Return the operation status. If the return value is RT_EOK, the function is successfully executed.
+ *          If the return value is any other values, it means this operation failed.
+ */
+static rt_err_t _timer_list_next_timeout(rt_list_t timer_list[], rt_tick_t *timeout_tick)
+{
+    struct rt_timer *timer;
+
+    if (!rt_list_isempty(&timer_list[RT_TIMER_SKIP_LIST_LEVEL - 1]))
+    {
+        timer = rt_list_entry(timer_list[RT_TIMER_SKIP_LIST_LEVEL - 1].next,
+                              struct rt_timer, row[RT_TIMER_SKIP_LIST_LEVEL - 1]);
+        *timeout_tick = timer->timeout_tick;
+        return RT_EOK;
+    }
+    return -RT_ERROR;
+}
+
+/**
+ * @brief Remove the timer
+ *
+ * @param timer the point of the timer
+ */
+rt_inline void _timer_remove(rt_timer_t timer)
+{
+    int i;
+
+    for (i = 0; i < RT_TIMER_SKIP_LIST_LEVEL; i++)
+    {
+        rt_list_remove(&timer->row[i]);
+    }
+}
+
+#if (DBG_LVL == DBG_LOG)
+/**
+ * @brief The number of timer
+ *
+ * @param timer the head of timer
+ *
+ * @return count of timer
+ */
+static int _timer_count_height(struct rt_timer *timer)
+{
+    int i, cnt = 0;
+
+    for (i = 0; i < RT_TIMER_SKIP_LIST_LEVEL; i++)
+    {
+        if (!rt_list_isempty(&timer->row[i]))
+            cnt++;
+    }
+    return cnt;
+}
+/**
+ * @brief dump the all timer information
+ *
+ * @param timer_heads the head of timer
+ */
+void rt_timer_dump(rt_list_t timer_heads[])
+{
+    rt_list_t *list;
+
+    for (list = timer_heads[RT_TIMER_SKIP_LIST_LEVEL - 1].next;
+         list != &timer_heads[RT_TIMER_SKIP_LIST_LEVEL - 1];
+         list = list->next)
+    {
+        struct rt_timer *timer = rt_list_entry(list,
+                                               struct rt_timer,
+                                               row[RT_TIMER_SKIP_LIST_LEVEL - 1]);
+        rt_kprintf("%d", _timer_count_height(timer));
+    }
+    rt_kprintf("\n");
+}
+#endif /* (DBG_LVL == DBG_LOG) */
+
+/**
+ * @addtogroup group_clock_management
+ */
+
+/**@{*/
+
+/**
+ * @brief This function will initialize a timer
+ *        normally this function is used to initialize a static timer object.
+ *
+ * @param timer is the point of timer
+ *
+ * @param name is a pointer to the name of the timer
+ *
+ * @param timeout is the callback of timer
+ *
+ * @param parameter is the param of the callback
+ *
+ * @param time is timeout ticks of timer
+ *
+ *             NOTE: The max timeout tick should be no more than (RT_TICK_MAX/2 - 1).
+ *
+ * @param flag is the flag of timer
+ *
+ */
+void rt_timer_init(rt_timer_t  timer,
+                   const char *name,
+                   void (*timeout)(void *parameter),
+                   void       *parameter,
+                   rt_tick_t   time,
+                   rt_uint8_t  flag)
+{
+    /* parameter check */
+    RT_ASSERT(timer != RT_NULL);
+    RT_ASSERT(timeout != RT_NULL);
+    RT_ASSERT(time < RT_TICK_MAX / 2);
+
+    /* timer object initialization */
+    rt_object_init(&(timer->parent), RT_Object_Class_Timer, name);
+
+    _timer_init(timer, timeout, parameter, time, flag);
+}
+RTM_EXPORT(rt_timer_init);
+
+/**
+ * @brief This function will detach a timer from timer management.
+ *
+ * @param timer is the timer to be detached
+ *
+ * @return the status of detach
+ */
+rt_err_t rt_timer_detach(rt_timer_t timer)
+{
+    rt_base_t level;
+    struct rt_spinlock *spinlock;
+
+    /* parameter check */
+    RT_ASSERT(timer != RT_NULL);
+    RT_ASSERT(rt_object_get_type(&timer->parent) == RT_Object_Class_Timer);
+    RT_ASSERT(rt_object_is_systemobject(&timer->parent));
+
+    spinlock = _timerlock_idx(timer);
+    level = rt_spin_lock_irqsave(spinlock);
+
+    _timer_remove(timer);
+    /* stop timer */
+    timer->parent.flag &= ~RT_TIMER_FLAG_ACTIVATED;
+
+    rt_spin_unlock_irqrestore(spinlock, level);
+    rt_object_detach(&(timer->parent));
+
+    return RT_EOK;
+}
+RTM_EXPORT(rt_timer_detach);
+
+#ifdef RT_USING_HEAP
+/**
+ * @brief This function will create a timer
+ *
+ * @param name is the name of timer
+ *
+ * @param timeout is the timeout function
+ *
+ * @param parameter is the parameter of timeout function
+ *
+ * @param time is timeout ticks of the timer
+ *
+ *        NOTE: The max timeout tick should be no more than (RT_TICK_MAX/2 - 1).
+ *
+ * @param flag is the flag of timer. Timer will invoke the timeout function according to the selected values of flag, if one or more of the following flags is set.
+ *
+ *          RT_TIMER_FLAG_ONE_SHOT          One shot timing
+ *          RT_TIMER_FLAG_PERIODIC          Periodic timing
+ *
+ *          RT_TIMER_FLAG_HARD_TIMER        Hardware timer
+ *          RT_TIMER_FLAG_SOFT_TIMER        Software timer
+ *          RT_TIMER_FLAG_THREAD_TIMER      Thread timer
+ *
+ *        NOTE:
+ *        You can use multiple values with "|" logical operator.  By default, system will use the RT_TIME_FLAG_HARD_TIMER.
+ *
+ * @return the created timer object
+ */
+rt_timer_t rt_timer_create(const char *name,
+                           void (*timeout)(void *parameter),
+                           void       *parameter,
+                           rt_tick_t   time,
+                           rt_uint8_t  flag)
+{
+    struct rt_timer *timer;
+
+    /* parameter check */
+    RT_ASSERT(timeout != RT_NULL);
+    RT_ASSERT(time < RT_TICK_MAX / 2);
+
+    /* allocate a object */
+    timer = (struct rt_timer *)rt_object_allocate(RT_Object_Class_Timer, name);
+    if (timer == RT_NULL)
+    {
+        return RT_NULL;
+    }
+
+    _timer_init(timer, timeout, parameter, time, flag);
+
+    return timer;
+}
+RTM_EXPORT(rt_timer_create);
+
+/**
+ * @brief This function will delete a timer and release timer memory
+ *
+ * @param timer the timer to be deleted
+ *
+ * @return the operation status, RT_EOK on OK; -RT_ERROR on error
+ */
+rt_err_t rt_timer_delete(rt_timer_t timer)
+{
+    rt_base_t level;
+    struct rt_spinlock *spinlock;
+
+    /* parameter check */
+    RT_ASSERT(timer != RT_NULL);
+    RT_ASSERT(rt_object_get_type(&timer->parent) == RT_Object_Class_Timer);
+    RT_ASSERT(rt_object_is_systemobject(&timer->parent) == RT_FALSE);
+
+    spinlock = _timerlock_idx(timer);
+
+    level = rt_spin_lock_irqsave(spinlock);
+
+    _timer_remove(timer);
+    /* stop timer */
+    timer->parent.flag &= ~RT_TIMER_FLAG_ACTIVATED;
+    rt_spin_unlock_irqrestore(spinlock, level);
+    rt_object_delete(&(timer->parent));
+
+    return RT_EOK;
+}
+RTM_EXPORT(rt_timer_delete);
+#endif /* RT_USING_HEAP */
+
+/**
+ * @brief This function will start the timer
+ *
+ * @param timer the timer to be started
+ *
+ * @return the operation status, RT_EOK on OK, -RT_ERROR on error
+ */
+static rt_err_t _timer_start(rt_list_t *timer_list, rt_timer_t timer)
+{
+    unsigned int row_lvl;
+    rt_list_t *row_head[RT_TIMER_SKIP_LIST_LEVEL];
+    unsigned int tst_nr;
+    static unsigned int random_nr;
+
+    /* remove timer from list */
+    _timer_remove(timer);
+    /* change status of timer */
+    timer->parent.flag &= ~RT_TIMER_FLAG_ACTIVATED;
+
+    RT_OBJECT_HOOK_CALL(rt_object_take_hook, (&(timer->parent)));
+
+    timer->timeout_tick = rt_tick_get() + timer->init_tick;
+
+    row_head[0]  = &timer_list[0];
+    for (row_lvl = 0; row_lvl < RT_TIMER_SKIP_LIST_LEVEL; row_lvl++)
+    {
+        for (; row_head[row_lvl] != timer_list[row_lvl].prev;
+             row_head[row_lvl]  = row_head[row_lvl]->next)
+        {
+            struct rt_timer *t;
+            rt_list_t *p = row_head[row_lvl]->next;
+
+            /* fix up the entry pointer */
+            t = rt_list_entry(p, struct rt_timer, row[row_lvl]);
+
+            /* If we have two timers that timeout at the same time, it's
+             * preferred that the timer inserted early get called early.
+             * So insert the new timer to the end the the some-timeout timer
+             * list.
+             */
+            if ((t->timeout_tick - timer->timeout_tick) == 0)
+            {
+                continue;
+            }
+            else if ((t->timeout_tick - timer->timeout_tick) < RT_TICK_MAX / 2)
+            {
+                break;
+            }
+        }
+        if (row_lvl != RT_TIMER_SKIP_LIST_LEVEL - 1)
+            row_head[row_lvl + 1] = row_head[row_lvl] + 1;
+    }
+
+    /* Interestingly, this super simple timer insert counter works very very
+     * well on distributing the list height uniformly. By means of "very very
+     * well", I mean it beats the randomness of timer->timeout_tick very easily
+     * (actually, the timeout_tick is not random and easy to be attacked). */
+    random_nr++;
+    tst_nr = random_nr;
+
+    rt_list_insert_after(row_head[RT_TIMER_SKIP_LIST_LEVEL - 1],
+                         &(timer->row[RT_TIMER_SKIP_LIST_LEVEL - 1]));
+    for (row_lvl = 2; row_lvl <= RT_TIMER_SKIP_LIST_LEVEL; row_lvl++)
+    {
+        if (!(tst_nr & RT_TIMER_SKIP_LIST_MASK))
+            rt_list_insert_after(row_head[RT_TIMER_SKIP_LIST_LEVEL - row_lvl],
+                                 &(timer->row[RT_TIMER_SKIP_LIST_LEVEL - row_lvl]));
+        else
+            break;
+        /* Shift over the bits we have tested. Works well with 1 bit and 2
+         * bits. */
+        tst_nr >>= (RT_TIMER_SKIP_LIST_MASK + 1) >> 1;
+    }
+
+    timer->parent.flag |= RT_TIMER_FLAG_ACTIVATED;
+
+    return RT_EOK;
+}
+
+/**
+ * @brief This function will check timer list, if a timeout event happens,
+ *        the corresponding timeout function will be invoked.
+ *
+ * @param timer_list The timer list to check.
+ * @param lock The lock for the timer list.
+ */
+static void _timer_check(rt_list_t *timer_list, struct rt_spinlock *lock)
+{
+    struct rt_timer *t;
+    rt_tick_t current_tick;
+    rt_base_t level;
+    rt_list_t list;
+
+    level = rt_spin_lock_irqsave(lock);
+
+    current_tick = rt_tick_get();
+
+    rt_list_init(&list);
+
+    while (!rt_list_isempty(&timer_list[RT_TIMER_SKIP_LIST_LEVEL - 1]))
+    {
+        t = rt_list_entry(timer_list[RT_TIMER_SKIP_LIST_LEVEL - 1].next,
+                          struct rt_timer, row[RT_TIMER_SKIP_LIST_LEVEL - 1]);
+
+        /* re-get tick */
+        current_tick = rt_tick_get();
+
+        /*
+         * It supposes that the new tick shall less than the half duration of
+         * tick max.
+         */
+        if ((current_tick - t->timeout_tick) < RT_TICK_MAX / 2)
+        {
+            RT_OBJECT_HOOK_CALL(rt_timer_enter_hook, (t));
+
+            /* remove timer from timer list firstly */
+            _timer_remove(t);
+            if (!(t->parent.flag & RT_TIMER_FLAG_PERIODIC))
+            {
+                t->parent.flag &= ~RT_TIMER_FLAG_ACTIVATED;
+            }
+
+            /* add timer to temporary list  */
+            rt_list_insert_after(&list, &(t->row[RT_TIMER_SKIP_LIST_LEVEL - 1]));
+
+            rt_spin_unlock_irqrestore(lock, level);
+
+            /* call timeout function */
+            t->timeout_func(t->parameter);
+
+            RT_OBJECT_HOOK_CALL(rt_timer_exit_hook, (t));
+
+            level = rt_spin_lock_irqsave(lock);
+
+            /* Check whether the timer object is detached or started again */
+            if (rt_list_isempty(&list))
+            {
+                continue;
+            }
+            rt_list_remove(&(t->row[RT_TIMER_SKIP_LIST_LEVEL - 1]));
+            if ((t->parent.flag & RT_TIMER_FLAG_PERIODIC) &&
+                (t->parent.flag & RT_TIMER_FLAG_ACTIVATED))
+            {
+                /* start it */
+                t->parent.flag &= ~RT_TIMER_FLAG_ACTIVATED;
+                _timer_start(timer_list, t);
+            }
+        }
+        else break;
+    }
+    rt_spin_unlock_irqrestore(lock, level);
+}
+
+/**
+ * @brief This function will start the timer
+ *
+ * @param timer the timer to be started
+ *
+ * @return the operation status, RT_EOK on OK, -RT_ERROR on error
+ */
+rt_err_t rt_timer_start(rt_timer_t timer)
+{
+    rt_sched_lock_level_t slvl;
+    int is_thread_timer = 0;
+    struct rt_spinlock *spinlock;
+    rt_list_t *timer_list;
+    rt_base_t level;
+    rt_err_t err;
+
+    /* parameter check */
+    RT_ASSERT(timer != RT_NULL);
+    RT_ASSERT(rt_object_get_type(&timer->parent) == RT_Object_Class_Timer);
+
+#ifdef RT_USING_TIMER_ALL_SOFT
+    timer_list = _soft_timer_list;
+    spinlock = &_stimer_lock;
+#else
+#ifdef RT_USING_TIMER_SOFT
+    if (timer->parent.flag & RT_TIMER_FLAG_SOFT_TIMER)
+    {
+        timer_list = _soft_timer_list;
+        spinlock = &_stimer_lock;
+    }
+    else
+#endif /* RT_USING_TIMER_SOFT */
+    {
+        timer_list = _timer_list;
+        spinlock = &_htimer_lock;
+    }
+#endif
+
+    if (timer->parent.flag & RT_TIMER_FLAG_THREAD_TIMER)
+    {
+        rt_thread_t thread;
+        is_thread_timer = 1;
+        rt_sched_lock(&slvl);
+
+        thread = rt_container_of(timer, struct rt_thread, thread_timer);
+        RT_ASSERT(rt_object_get_type(&thread->parent) == RT_Object_Class_Thread);
+        rt_sched_thread_timer_start(thread);
+    }
+
+    level = rt_spin_lock_irqsave(spinlock);
+
+    err = _timer_start(timer_list, timer);
+
+    rt_spin_unlock_irqrestore(spinlock, level);
+
+    if (is_thread_timer)
+    {
+        rt_sched_unlock(slvl);
+    }
+
+    return err;
+}
+RTM_EXPORT(rt_timer_start);
+
+/**
+ * @brief This function will stop the timer
+ *
+ * @param timer the timer to be stopped
+ *
+ * @return the operation status, RT_EOK on OK, -RT_ERROR on error
+ */
+rt_err_t rt_timer_stop(rt_timer_t timer)
+{
+    rt_base_t level;
+    struct rt_spinlock *spinlock;
+
+    /* timer check */
+    RT_ASSERT(timer != RT_NULL);
+    RT_ASSERT(rt_object_get_type(&timer->parent) == RT_Object_Class_Timer);
+
+    spinlock = _timerlock_idx(timer);
+
+    level = rt_spin_lock_irqsave(spinlock);
+
+    if (!(timer->parent.flag & RT_TIMER_FLAG_ACTIVATED))
+    {
+        rt_spin_unlock_irqrestore(spinlock, level);
+        return -RT_ERROR;
+    }
+    RT_OBJECT_HOOK_CALL(rt_object_put_hook, (&(timer->parent)));
+
+    _timer_remove(timer);
+    /* change status */
+    timer->parent.flag &= ~RT_TIMER_FLAG_ACTIVATED;
+
+    rt_spin_unlock_irqrestore(spinlock, level);
+
+    return RT_EOK;
+}
+RTM_EXPORT(rt_timer_stop);
+
+/**
+ * @brief This function will get or set some options of the timer
+ *
+ * @param timer the timer to be get or set
+ * @param cmd the control command
+ * @param arg the argument
+ *
+ * @return the statu of control
+ */
+rt_err_t rt_timer_control(rt_timer_t timer, int cmd, void *arg)
+{
+    struct rt_spinlock *spinlock;
+    rt_base_t level;
+
+    /* parameter check */
+    RT_ASSERT(timer != RT_NULL);
+    RT_ASSERT(rt_object_get_type(&timer->parent) == RT_Object_Class_Timer);
+
+    spinlock = _timerlock_idx(timer);
+
+    level = rt_spin_lock_irqsave(spinlock);
+    switch (cmd)
+    {
+    case RT_TIMER_CTRL_GET_TIME:
+        *(rt_tick_t *)arg = timer->init_tick;
+        break;
+
+    case RT_TIMER_CTRL_SET_TIME:
+        RT_ASSERT((*(rt_tick_t *)arg) < RT_TICK_MAX / 2);
+        if (timer->parent.flag & RT_TIMER_FLAG_ACTIVATED)
+        {
+            _timer_remove(timer);
+            timer->parent.flag &= ~RT_TIMER_FLAG_ACTIVATED;
+        }
+        timer->init_tick = *(rt_tick_t *)arg;
+        break;
+
+    case RT_TIMER_CTRL_SET_ONESHOT:
+        timer->parent.flag &= ~RT_TIMER_FLAG_PERIODIC;
+        break;
+
+    case RT_TIMER_CTRL_SET_PERIODIC:
+        timer->parent.flag |= RT_TIMER_FLAG_PERIODIC;
+        break;
+
+    case RT_TIMER_CTRL_GET_STATE:
+        if(timer->parent.flag & RT_TIMER_FLAG_ACTIVATED)
+        {
+            /*timer is start and run*/
+            *(rt_uint32_t *)arg = RT_TIMER_FLAG_ACTIVATED;
+        }
+        else
+        {
+            /*timer is stop*/
+            *(rt_uint32_t *)arg = RT_TIMER_FLAG_DEACTIVATED;
+        }
+        break;
+
+    case RT_TIMER_CTRL_GET_REMAIN_TIME:
+        *(rt_tick_t *)arg =  timer->timeout_tick;
+        break;
+    case RT_TIMER_CTRL_GET_FUNC:
+        *(void **)arg = (void *)timer->timeout_func;
+        break;
+
+    case RT_TIMER_CTRL_SET_FUNC:
+        timer->timeout_func = (void (*)(void*))arg;
+        break;
+
+    case RT_TIMER_CTRL_GET_PARM:
+        *(void **)arg = timer->parameter;
+        break;
+
+    case RT_TIMER_CTRL_SET_PARM:
+        timer->parameter = arg;
+        break;
+
+    default:
+        break;
+    }
+    rt_spin_unlock_irqrestore(spinlock, level);
+
+    return RT_EOK;
+}
+RTM_EXPORT(rt_timer_control);
+
+/**
+ * @brief This function will check timer list, if a timeout event happens,
+ *        the corresponding timeout function will be invoked.
+ *
+ * @note This function shall be invoked in operating system timer interrupt.
+ */
+void rt_timer_check(void)
+{
+    RT_ASSERT(rt_interrupt_get_nest() > 0);
+
+#ifdef RT_USING_SMP
+    /* Running on core 0 only */
+    if (rt_cpu_get_id() != 0)
+    {
+        return;
+    }
+#endif
+
+#ifdef RT_USING_TIMER_SOFT
+    rt_err_t ret = RT_ERROR;
+    rt_tick_t next_timeout;
+
+    ret = _timer_list_next_timeout(_soft_timer_list, &next_timeout);
+    if ((ret == RT_EOK) && (next_timeout <= rt_tick_get()))
+    {
+        rt_sem_release(&_soft_timer_sem);
+    }
+#endif
+#ifndef RT_USING_TIMER_ALL_SOFT
+    _timer_check(_timer_list, &_htimer_lock);
+#endif
+}
+
+/**
+ * @brief This function will return the next timeout tick in the system.
+ *
+ * @return the next timeout tick in the system
+ */
+rt_tick_t rt_timer_next_timeout_tick(void)
+{
+    rt_base_t level;
+    rt_tick_t htimer_next_timeout = RT_TICK_MAX, stimer_next_timeout = RT_TICK_MAX;
+
+#ifndef RT_USING_TIMER_ALL_SOFT
+    level = rt_spin_lock_irqsave(&_htimer_lock);
+    _timer_list_next_timeout(_timer_list, &htimer_next_timeout);
+    rt_spin_unlock_irqrestore(&_htimer_lock, level);
+#endif
+
+#ifdef RT_USING_TIMER_SOFT
+    level = rt_spin_lock_irqsave(&_stimer_lock);
+    _timer_list_next_timeout(_soft_timer_list, &stimer_next_timeout);
+    rt_spin_unlock_irqrestore(&_stimer_lock, level);
+#endif
+
+    return htimer_next_timeout < stimer_next_timeout ? htimer_next_timeout : stimer_next_timeout;
+}
+
+#ifdef RT_USING_TIMER_SOFT
+/**
+ * @brief System timer thread entry
+ *
+ * @param parameter is the arg of the thread
+ */
+static void _timer_thread_entry(void *parameter)
+{
+    RT_UNUSED(parameter);
+
+    while (1)
+    {
+        _timer_check(_soft_timer_list, &_stimer_lock); /* check software timer */
+        rt_sem_take(&_soft_timer_sem, RT_WAITING_FOREVER);
+    }
+}
+#endif /* RT_USING_TIMER_SOFT */
+
+/**
+ * @ingroup group_system_init
+ *
+ * @brief This function will initialize system timer
+ */
+void rt_system_timer_init(void)
+{
+#ifndef RT_USING_TIMER_ALL_SOFT
+    rt_size_t i;
+
+    for (i = 0; i < sizeof(_timer_list) / sizeof(_timer_list[0]); i++)
+    {
+        rt_list_init(_timer_list + i);
+    }
+
+    rt_spin_lock_init(&_htimer_lock);
+#endif
+}
+
+/**
+ * @ingroup group_system_init
+ *
+ * @brief This function will initialize system timer thread
+ */
+void rt_system_timer_thread_init(void)
+{
+#ifdef RT_USING_TIMER_SOFT
+    int i;
+
+    for (i = 0;
+         i < sizeof(_soft_timer_list) / sizeof(_soft_timer_list[0]);
+         i++)
+    {
+        rt_list_init(_soft_timer_list + i);
+    }
+    rt_spin_lock_init(&_stimer_lock);
+    rt_sem_init(&_soft_timer_sem, "stimer", 0, RT_IPC_FLAG_PRIO);
+    rt_sem_control(&_soft_timer_sem, RT_IPC_CMD_SET_VLIMIT, (void*)1);
+    /* start software timer thread */
+    rt_thread_init(&_timer_thread,
+                   "timer",
+                   _timer_thread_entry,
+                   RT_NULL,
+                   &_timer_thread_stack[0],
+                   sizeof(_timer_thread_stack),
+                   RT_TIMER_THREAD_PRIO,
+                   10);
+
+    /* startup */
+    rt_thread_startup(&_timer_thread);
+#endif /* RT_USING_TIMER_SOFT */
+}
+
+/**@}*/