kernel-sample/idlehook_sample.c

/* 
 * Copyright (c) 2006-2018, RT-Thread Development Team 
 * 
 * SPDX-License-Identifier: Apache-2.0 
 * 
 * Change Logs: 
 * Date           Author       Notes 
 * 2018-08-24     yangjie      the first version 
 */  

/*
 * 程序清单：空闲任务钩子例程
 *
 * 这个例程创建一个线程，通过延时进入空闲任务钩子，用于打印进入空闲钩子的次数
 */

#include <rtthread.h>
#include <rthw.h>

#define THREAD_PRIORITY      20
#define THREAD_STACK_SIZE    1024
#define THREAD_TIMESLICE     5

/* 指向线程控制块的指针 */
static rt_thread_t tid = RT_NULL;

/* 空闲函数钩子函数执行次数 */
volatile static int hook_times = 0;

/* 空闲任务钩子函数 */
static void idle_hook()
{
    if (0 == (hook_times % 10000))
    {
        rt_kprintf("enter idle hook %d times.\n", hook_times);
    }

    rt_enter_critical();
    hook_times++;
    rt_exit_critical();
}

/* 线程入口 */
static void thread_entry(void *parameter)
{
    int i = 5;
    while (i--)
    {
        rt_kprintf("enter thread1.\n");
        rt_enter_critical();
        hook_times = 0;
        rt_exit_critical();

        /* 休眠500ms */
        rt_kprintf("thread1 delay 50 OS Tick.\n", hook_times);
        rt_thread_mdelay(500);
    }
    rt_kprintf("delete idle hook.\n");
    
    /* 删除空闲钩子函数 */
    rt_thread_idle_delhook(idle_hook);
    rt_kprintf("thread1 finish.\n");
}

int idle_hook_sample(void)
{
    /* 设置空闲线程钩子 */
    rt_thread_idle_sethook(idle_hook);

    /* 创建线程 */
    tid = rt_thread_create("thread1",
                           thread_entry, RT_NULL, 
                           THREAD_STACK_SIZE, 
                           THREAD_PRIORITY, THREAD_TIMESLICE);
    if (tid != RT_NULL)
        rt_thread_startup(tid);

    return 0;
}

/* 导出到 msh 命令列表中 */
MSH_CMD_EXPORT(idle_hook_sample, idle hook sample);