C++ (Cpp) _thr_umtx_wait Examples

Example #1

File: thr_join.c Project: juanfra684/DragonFlyBSD

static int
join_common(pthread_t pthread, void **thread_return,
	const struct timespec *abstime)
{
	struct pthread *curthread = tls_get_curthread();
	struct timespec ts, ts2, *tsp;
	void *tmp;
	long state;
	int oldcancel;
	int ret = 0;
 
	if (pthread == NULL)
		return (EINVAL);

	if (pthread == curthread)
		return (EDEADLK);

	THREAD_LIST_LOCK(curthread);
	if ((ret = _thr_find_thread(curthread, pthread, 1)) != 0) {
		ret = ESRCH;
	} else if ((pthread->tlflags & TLFLAGS_DETACHED) != 0) {
		ret = ESRCH;
	} else if (pthread->joiner != NULL) {
		/* Multiple joiners are not supported. */
		ret = ENOTSUP;
	}
	if (ret) {
		THREAD_LIST_UNLOCK(curthread);
		return (ret);
	}
	/* Set the running thread to be the joiner: */
	pthread->joiner = curthread;

	THREAD_LIST_UNLOCK(curthread);

	THR_CLEANUP_PUSH(curthread, backout_join, pthread);
	oldcancel = _thr_cancel_enter(curthread);

	while ((state = pthread->state) != PS_DEAD) {
		if (abstime != NULL) {
			clock_gettime(CLOCK_REALTIME, &ts);
			TIMESPEC_SUB(&ts2, abstime, &ts);
			if (ts2.tv_sec < 0) {
				ret = ETIMEDOUT;
				break;
			}
			tsp = &ts2;
		} else
			tsp = NULL;
		ret = _thr_umtx_wait(&pthread->state, state, tsp,
			 CLOCK_REALTIME);
		if (ret == ETIMEDOUT)
			break;
	}

	_thr_cancel_leave(curthread, oldcancel);
	THR_CLEANUP_POP(curthread, 0);

	if (ret == ETIMEDOUT) {
		THREAD_LIST_LOCK(curthread);
		pthread->joiner = NULL;
		THREAD_LIST_UNLOCK(curthread);
	} else {
		ret = 0;
		tmp = pthread->ret;
		THREAD_LIST_LOCK(curthread);
		pthread->tlflags |= TLFLAGS_DETACHED;
		pthread->joiner = NULL;
		THR_GCLIST_ADD(pthread);
		THREAD_LIST_UNLOCK(curthread);

		if (thread_return != NULL)
			*thread_return = tmp;
	}
	return (ret);
}

Example #2

File: thr_join.c Project: edgar-pek/PerspicuOS

/*
 * Cancellation behavior:
 *   if the thread is canceled, joinee is not recycled.
 */
static int
join_common(pthread_t pthread, void **thread_return,
	const struct timespec *abstime)
{
	struct pthread *curthread = _get_curthread();
	struct timespec ts, ts2, *tsp;
	void *tmp;
	long tid;
	int ret = 0;

	if (pthread == NULL)
		return (EINVAL);

	if (pthread == curthread)
		return (EDEADLK);

	if ((ret = _thr_find_thread(curthread, pthread, 1)) != 0)
		return (ESRCH);

	if ((pthread->flags & THR_FLAGS_DETACHED) != 0) {
		ret = EINVAL;
	} else if (pthread->joiner != NULL) {
		/* Multiple joiners are not supported. */
		ret = ENOTSUP;
	}
	if (ret) {
		THR_THREAD_UNLOCK(curthread, pthread);
		return (ret);
	}
	/* Set the running thread to be the joiner: */
	pthread->joiner = curthread;

	THR_THREAD_UNLOCK(curthread, pthread);

	THR_CLEANUP_PUSH(curthread, backout_join, pthread);
	_thr_cancel_enter(curthread);

	tid = pthread->tid;
	while (pthread->tid != TID_TERMINATED) {
		_thr_testcancel(curthread);
		if (abstime != NULL) {
			clock_gettime(CLOCK_REALTIME, &ts);
			TIMESPEC_SUB(&ts2, abstime, &ts);
			if (ts2.tv_sec < 0) {
				ret = ETIMEDOUT;
				break;
			}
			tsp = &ts2;
		} else
			tsp = NULL;
		ret = _thr_umtx_wait(&pthread->tid, tid, tsp);
		if (ret == ETIMEDOUT)
			break;
	}

	_thr_cancel_leave(curthread, 0);
	THR_CLEANUP_POP(curthread, 0);

	if (ret == ETIMEDOUT) {
		THR_THREAD_LOCK(curthread, pthread);
		pthread->joiner = NULL;
		THR_THREAD_UNLOCK(curthread, pthread);
	} else {
		ret = 0;
		tmp = pthread->ret;
		THR_THREAD_LOCK(curthread, pthread);
		pthread->flags |= THR_FLAGS_DETACHED;
		pthread->joiner = NULL;
		_thr_try_gc(curthread, pthread); /* thread lock released */

		if (thread_return != NULL)
			*thread_return = tmp;
	}
	return (ret);
}