?? sem_post.c
字號:
/* include sem_post */
#include "unpipc.h"
#include "semaphore.h"
int
mysem_post(mysem_t *sem)
{
int n;
if (sem->sem_magic != SEM_MAGIC) {
errno = EINVAL;
return(-1);
}
if ( (n = pthread_mutex_lock(&sem->sem_mutex)) != 0) {
errno = n;
return(-1);
}
if (sem->sem_count == 0)
pthread_cond_signal(&sem->sem_cond);
sem->sem_count++;
pthread_mutex_unlock(&sem->sem_mutex);
return(0);
}
/* end sem_post */
void
Mysem_post(mysem_t *sem)
{
if (mysem_post(sem) == -1)
err_sys("mysem_post error");
}
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