136 lines
3.1 KiB
C
136 lines
3.1 KiB
C
/*
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* 程序清单：动态信号量
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*
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* 这个例子中将创建一个动态信号量（初始值为0 ）及一个动态线程，在这个动态线程中
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* 将试图采用超时方式去持有信号量，应该超时返回。然后这个线程释放一次信号量，并
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* 在后面继续采用永久等待方式去持有信号量， 成功获得信号量后返回。
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*/
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#include <rtthread.h>
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#include "tc_comm.h"
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/* 指向线程控制块的指针 */
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static rt_thread_t tid = RT_NULL;
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/* 指向信号量的指针 */
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static rt_sem_t sem = RT_NULL;
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/* 线程入口 */
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static void thread_entry(void* parameter)
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{
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rt_err_t result;
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rt_tick_t tick;
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/* 获得当前的OS Tick */
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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 */
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result = rt_sem_take(sem, 10);
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if (result == -RT_ETIMEOUT)
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{
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rt_tick_t new_tick = rt_tick_get();
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/* 可以有两个 tick 的误差 */
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if (new_tick - tick >= 12)
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{
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rt_kprintf("tick error to large: expect: 10, get %d\n",
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new_tick - tick);
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/* 如果失败，则测试失败 */
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tc_done(TC_STAT_FAILED);
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rt_sem_delete(sem);
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return;
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}
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rt_kprintf("take semaphore timeout\n");
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}
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else
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{
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/* 因为并没释放信号量，应该是超时返回，否则测试失败 */
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tc_done(TC_STAT_FAILED);
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rt_sem_delete(sem);
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return;
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}
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/* 释放一次信号量 */
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rt_sem_release(sem);
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/* 继续持有信号量，并永远等待直到持有到信号量 */
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result = rt_sem_take(sem, RT_WAITING_FOREVER);
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if (result != RT_EOK)
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{
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/* 返回不正确，测试失败 */
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tc_done(TC_STAT_FAILED);
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rt_sem_delete(sem);
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return;
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}
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/* 测试成功 */
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tc_done(TC_STAT_PASSED);
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/* 删除信号量 */
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rt_sem_delete(sem);
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}
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int semaphore_dynamic_init()
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{
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/* 创建一个信号量，初始值是0 */
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sem = rt_sem_create("sem", 0, RT_IPC_FLAG_FIFO);
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if (sem == RT_NULL)
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{
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tc_stat(TC_STAT_END | TC_STAT_FAILED);
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return 0;
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}
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/* 创建线程 */
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tid = rt_thread_create("thread",
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thread_entry, RT_NULL, /* 线程入口是thread_entry, 入口参数是RT_NULL */
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THREAD_STACK_SIZE, THREAD_PRIORITY, THREAD_TIMESLICE);
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if (tid != RT_NULL)
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rt_thread_startup(tid);
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else
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tc_stat(TC_STAT_END | TC_STAT_FAILED);
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return 0;
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}
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#ifdef RT_USING_TC
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static void _tc_cleanup()
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{
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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 */
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rt_enter_critical();
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if (sem)
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{
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rt_sem_delete(sem);
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sem = RT_NULL;
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}
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/* 删除线程 */
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if (tid != RT_NULL && tid->stat != RT_THREAD_CLOSE)
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{
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rt_thread_delete(tid);
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}
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/* 调度器解锁 */
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rt_exit_critical();
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/* 设置TestCase状态 */
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tc_done(TC_STAT_PASSED);
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}
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int _tc_semaphore_dynamic()
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{
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/* 设置TestCase清理回调函数 */
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tc_cleanup(_tc_cleanup);
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semaphore_dynamic_init();
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/* 返回TestCase运行的最长时间 */
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return 100;
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}
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/* 输出函数命令到finsh shell中 */
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FINSH_FUNCTION_EXPORT(_tc_semaphore_dynamic, a dynamic semaphore example);
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#else
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/* 用户应用入口 */
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int rt_application_init()
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{
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semaphore_dynamic_init();
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return 0;
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}
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#endif
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