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wmano
2025-08-16 22:58:22 +08:00
commit 52a3ed5862
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rt-thread/src/clock.c
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/*
* 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 */
}
/**@}*/