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queue_signalled: try to read once before sleeping

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This commit is contained in:
Georg Reinke 2017-05-11 13:49:54 +02:00
parent 4bffe387a9
commit f724a00033
1 changed files with 13 additions and 2 deletions
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15
lib/queue_signalled.c
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@ -95,24 +95,35 @@ int queue_signalled_push_many(struct queue_signalled *qs, void *ptr[], size_t cn
int queue_signalled_pull(struct queue_signalled *qs, void **ptr)
{
int ret;
/* Make sure that qs->mutex is unlocked if this thread gets cancelled. */
pthread_cleanup_push((void (*)(void*)) pthread_mutex_unlock, &qs->mutex);
pthread_mutex_lock(&qs->mutex);
pthread_cond_wait(&qs->ready, &qs->mutex);
ret = queue_pull(&qs->queue, ptr);
if (!ret)
pthread_cond_wait(&qs->ready, &qs->mutex);
pthread_mutex_unlock(&qs->mutex);
pthread_cleanup_pop(0);
if (ret)
return ret;
return queue_pull(&qs->queue, ptr);
}
int queue_signalled_pull_many(struct queue_signalled *qs, void *ptr[], size_t cnt)
{
int ret;
/* Make sure that qs->mutex is unlocked if this thread gets cancelled. */
pthread_cleanup_push((void (*)(void*)) pthread_mutex_unlock, &qs->mutex);
pthread_mutex_lock(&qs->mutex);
pthread_cond_wait(&qs->ready, &qs->mutex);
ret = queue_pull_many(&qs->queue, ptr, cnt);
if (!ret)
pthread_cond_wait(&qs->ready, &qs->mutex);
pthread_mutex_unlock(&qs->mutex);
pthread_cleanup_pop(0);
if (ret)
return ret;
return queue_pull_many(&qs->queue, ptr, cnt);
}