Exemplo n.º 1
0
int
_sem_wait(sem_t *sem)
{
	struct pthread *curthread;
	int retval;

	if (sem_check_validity(sem) != 0)
		return (-1);

	curthread = _get_curthread();
	if ((*sem)->syssem != 0) {
		_thr_cancel_enter(curthread);
		retval = ksem_wait((*sem)->semid);
		_thr_cancel_leave(curthread, retval != 0);
	}
	else {
		_pthread_testcancel();
		_pthread_mutex_lock(&(*sem)->lock);

		while ((*sem)->count <= 0) {
			(*sem)->nwaiters++;
			THR_CLEANUP_PUSH(curthread, decrease_nwaiters, sem);
			_pthread_cond_wait(&(*sem)->gtzero, &(*sem)->lock);
			THR_CLEANUP_POP(curthread, 0);
			(*sem)->nwaiters--;
		}
		(*sem)->count--;

		_pthread_mutex_unlock(&(*sem)->lock);

		retval = 0;
	}
	return (retval);
}
Exemplo n.º 2
0
int
_sem_destroy(sem_t *sem)
{
	if (sem_check_validity(sem) != 0)
		return (-1);

	(*sem)->magic = 0;

	switch ((*sem)->semid) {
	case SEMID_LWP:
		free(*sem);
		break;
	case SEMID_FORK:
		/* memory is left intact */
		break;
	}
	return (0);
}