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@@ -1,50 +1,65 @@
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+/*
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+ * 程序清单:静态信号量
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+ *
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+ * 这个例子中将创建一个静态信号量(初始值为0 )及一个静态线程,在这个静态线程中
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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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+/* 线程控制块及栈 */
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+static struct rt_thread thread;
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+static rt_uint8_t thread_stack[THREAD_STACK_SIZE];
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+/* 信号量控制块 */
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static struct rt_semaphore sem;
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-struct rt_thread thread;
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-static char thread_stack[THREAD_STACK_SIZE];
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+
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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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- /* get current tick */
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+ /* 获得当前的OS Tick */
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tick = rt_tick_get();
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- /* take a semaphore for 10 OS Tick */
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+ /* 试图持有信号量,最大等待10个OS Tick后返回 */
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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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+ /* 超时后判断是否刚好是10个OS Tick */
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if (rt_tick_get() - tick != 10)
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{
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tc_done(TC_STAT_FAILED);
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rt_sem_detach(&sem);
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return;
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}
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- rt_kprintf("take semaphore timeout");
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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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+ /* 因为没有其他地方是否信号量,所以不应该成功持有信号量,否则测试失败 */
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tc_done(TC_STAT_FAILED);
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rt_sem_detach(&sem);
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return;
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}
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- /* release semaphore one time */
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+ /* 释放一次信号量 */
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rt_sem_release(&sem);
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+ /* 永久等待方式持有信号量 */
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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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+ /* 不成功则测试失败 */
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tc_done(TC_STAT_FAILED);
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rt_sem_detach(&sem);
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return;
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}
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- /* testcase passed */
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+ /* 测试通过 */
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tc_done(TC_STAT_PASSED);
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- /* detach semaphore */
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+ /* 脱离信号量对象 */
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rt_sem_detach(&sem);
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}
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@@ -52,6 +67,7 @@ int semaphore_static_init()
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{
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rt_err_t result;
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+ /* 初始化信号量,初始值是0 */
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result = rt_sem_init(&sem, "sem", 0, RT_IPC_FLAG_FIFO);
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if (result != RT_EOK)
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{
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@@ -59,10 +75,12 @@ int semaphore_static_init()
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return 0;
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}
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- result = rt_thread_init(&thread, "test",
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- thread_entry, RT_NULL,
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- thread_stack, THREAD_STACK_SIZE, THREAD_PRIORITY, THREAD_TIMESLICE);
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- if (result == RT_EOK)
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+ /* 初始化线程1 */
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+ result = rt_thread_init(&thread, "thread", /* 线程名:thread */
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+ thread_entry, RT_NULL, /* 线程的入口是thread_entry,入口参数是RT_NULL*/
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+ &thread_stack[0], sizeof(thread_stack), /* 线程栈是thread_stack */
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+ THREAD_PRIORITY, 10);
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+ if (result == RT_EOK) /* 如果返回正确,启动线程1 */
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rt_thread_startup(&thread);
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else
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tc_stat(TC_STAT_END | TC_STAT_FAILED);
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@@ -73,29 +91,41 @@ int semaphore_static_init()
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#ifdef RT_USING_TC
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static void _tc_cleanup()
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{
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- /* lock scheduler */
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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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+ /* 执行线程脱离 */
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if (thread.stat != RT_THREAD_CLOSE)
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+ {
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rt_thread_detach(&thread);
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- /* unlock scheduler */
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+ /* 执行信号量对象脱离 */
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+ rt_sem_detach(&sem);
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+ }
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+
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+ /* 调度器解锁 */
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rt_exit_critical();
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+
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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_static()
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{
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- /* set tc cleanup */
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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_static_init();
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- return 30;
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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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-FINSH_FUNCTION_EXPORT(_tc_semaphore_static, a static semaphore test);
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+/* 输出函数命令到finsh shell中 */
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+FINSH_FUNCTION_EXPORT(_tc_semaphore_static, a static 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_static_init();
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+ thread_static_init();
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return 0;
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}
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