rt-thread/examples/kernel/semaphore_dynamic.c

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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
*
*/
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/*
*
*
* 0 线线
* 线
*
*/
#include <rtthread.h>
#include "tc_comm.h"
/* 指向线程控制块的指针 */
static rt_thread_t tid = RT_NULL;
/* 指向信号量的指针 */
static rt_sem_t sem = RT_NULL;
/* 线程入口 */
static void thread_entry(void* parameter)
{
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rt_err_t result;
rt_tick_t tick;
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/* 获得当前的OS Tick */
tick = rt_tick_get();
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/* 试图持有一个信号量如果10个OS Tick依然没拿到则超时返回 */
result = rt_sem_take(sem, 10);
if (result == -RT_ETIMEOUT)
{
rt_tick_t new_tick = rt_tick_get();
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/* 可以有两个 tick 的误差 */
if (new_tick - tick >= 12)
{
rt_kprintf("tick error to large: expect: 10, get %d\n",
new_tick - tick);
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/* 如果失败,则测试失败 */
tc_done(TC_STAT_FAILED);
rt_sem_delete(sem);
return;
}
rt_kprintf("take semaphore timeout\n");
}
else
{
/* 因为并没释放信号量,应该是超时返回,否则测试失败 */
tc_done(TC_STAT_FAILED);
rt_sem_delete(sem);
return;
}
/* 释放一次信号量 */
rt_sem_release(sem);
/* 继续持有信号量,并永远等待直到持有到信号量 */
result = rt_sem_take(sem, RT_WAITING_FOREVER);
if (result != RT_EOK)
{
/* 返回不正确,测试失败 */
tc_done(TC_STAT_FAILED);
rt_sem_delete(sem);
return;
}
/* 测试成功 */
tc_done(TC_STAT_PASSED);
/* 删除信号量 */
rt_sem_delete(sem);
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}
int semaphore_dynamic_init()
{
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/* 创建一个信号量初始值是0 */
sem = rt_sem_create("sem", 0, RT_IPC_FLAG_FIFO);
if (sem == RT_NULL)
{
tc_stat(TC_STAT_END | TC_STAT_FAILED);
return 0;
}
/* 创建线程 */
tid = rt_thread_create("thread",
thread_entry, RT_NULL, /* 线程入口是thread_entry, 入口参数是RT_NULL */
THREAD_STACK_SIZE, THREAD_PRIORITY, THREAD_TIMESLICE);
if (tid != RT_NULL)
rt_thread_startup(tid);
else
tc_stat(TC_STAT_END | TC_STAT_FAILED);
return 0;
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}
#ifdef RT_USING_TC
static void _tc_cleanup()
{
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/* 调度器上锁,上锁后,将不再切换到其他线程,仅响应中断 */
rt_enter_critical();
if (sem)
{
rt_sem_delete(sem);
sem = RT_NULL;
}
/* 删除线程 */
if (tid != RT_NULL && tid->stat != RT_THREAD_CLOSE)
{
rt_thread_delete(tid);
}
/* 调度器解锁 */
rt_exit_critical();
/* 设置TestCase状态 */
tc_done(TC_STAT_PASSED);
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}
int _tc_semaphore_dynamic()
{
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/* 设置TestCase清理回调函数 */
tc_cleanup(_tc_cleanup);
semaphore_dynamic_init();
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/* 返回TestCase运行的最长时间 */
return 100;
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}
/* 输出函数命令到finsh shell中 */
FINSH_FUNCTION_EXPORT(_tc_semaphore_dynamic, a dynamic semaphore example);
#else
/* 用户应用入口 */
int rt_application_init()
{
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semaphore_dynamic_init();
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return 0;
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}
#endif