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);



void rt_tick_sethook(void (*hook)(void))
{
    rt_tick_hook = hook;
}
#endif /* RT_USING_HOOK */



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);

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 */

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();
}

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
}

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);

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 */
}