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git-svn-id: https://rt-thread.googlecode.com/svn/trunk@525 bbd45198-f89e-11dd-88c7-29a3b14d5316
This commit is contained in:
bernard.xiong
2010-03-23 09:45:58 +00:00
parent 8d19f32ac2
commit 8d4da31b8e
7 changed files with 141 additions and 44 deletions
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57
examples/kernel/mutex_simple.c
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@@ -8,33 +8,83 @@
static rt_thread_t tid1 = RT_NULL;
static rt_thread_t tid2 = RT_NULL;
static rt_thread_t tid3 = RT_NULL;
static rt_mutex_t mutex = RT_NULL;
/* 线程1入口 */
static void thread1_entry(void* parameter)
{
while (1)
/* 先让低优先级线程运行 */
rt_thread_delay(10);
/* 此时thread3持有mutex，并且thread2等待持有mutex */
/* 检查thread2与thread3的优先级情况 */
if (tid2->current_priority != tid3->current_priority)
{
/* 优先级不相同，测试失败 */
tc_stat(TC_STAT_END | TC_STAT_FAILED);
return;
}
}
/* 线程2入口 */
static void thread2_entry(void* parameter)
{
rt_err_t result;
/* 先让低优先级线程运行 */
rt_thread_delay(5);
while (1)
{
/*
* 试图持有互斥锁，此时thread3持有，应把thread3的优先级提升到thread2相同
* 的优先级
*/
result = rt_mutex_take(mutex, RT_WAITING_FOREVER);
if (result == RT_EOK)
{
/* 释放互斥锁 */
rt_mutex_release(mutex);
}
}
}
/* 线程3入口 */
static void thread3_entry(void* parameter)
{
rt_tick_t tick;
rt_err_t result;
while (1)
{
result = rt_mutex_take(mutex, RT_WAITING_FOREVER);
result = rt_mutex_take(mutex, RT_WAITING_FOREVER);
if (result != RT_EOK)
{
tc_stat(TC_STAT_END | TC_STAT_FAILED);
}
/* 做一个长时间的循环，总共50个OS Tick */
tick = rt_tick_get();
while (rt_tick_get() - tick < 50) ;
rt_mutex_release(mutex);
rt_mutex_release(mutex);
}
}
int mutex_simple_init()
{
/* 创建互斥锁 */
mutex = rt_mutex_create("mutex", RT_IPC_FLAG_FIFO);
if (mutex == RT_NULL)
{
tc_stat(TC_STAT_END | TC_STAT_FAILED);
return 0;
}
/* 创建线程1 */
tid1 = rt_thread_create("t1",
thread1_entry, RT_NULL, /* 线程入口是thread1_entry, 入口参数是RT_NULL */
@@ -79,6 +129,11 @@ static void _tc_cleanup()
if (tid3 != RT_NULL && tid3->stat != RT_THREAD_CLOSE)
rt_thread_delete(tid3);
if (mutex != RT_NULL)
{
rt_mutex_delete(mutex);
}
/* 调度器解锁 */
rt_exit_critical();