cond_var.c

来自「xenomai 很好的linux实时补丁」· C语言 代码 · 共 57 行

#include <native/mutex.h>
#include <native/cond.h>

RT_COND cond_desc;

RT_MUTEX mutex_desc;

int shared_event = 0;

void foo (void)

{
    int err;

    /* Create a condition variable and a mutex guarding it; we could
       also have attempted to bind to some pre-existing objects, using
       rt_cond_bind() and rt_mutex_bind() instead of creating them. */

    err = rt_mutex_create(&mutex_desc,"MyCondMutex");
    err = rt_cond_create(&cond_desc,"MyCondVar");

    /* Now, wait for some task to post the shared event... */

    rt_mutex_lock(&mutex_desc,TM_INFINITE);

    while (!shared_event && !err)
	err = rt_cond_wait(&cond_desc,&mutex_desc,TM_INFINITE);
    
    rt_mutex_unlock(&mutex_desc);

    /* ... */
}

void bar (void)

{
    /* ... */

    /* Post the shared event. */

    rt_mutex_lock(&mutex_desc,TM_INFINITE);

    shared_event = 1;
    rt_cond_signal(&cond_desc);

    rt_mutex_unlock(&mutex_desc);

    /* ... */
}

void cleanup (void)

{
    rt_cond_delete(&cond_desc);
    rt_mutex_delete(&mutex_desc);
}