_thr_umtx_wait
_thr_umtx_wait(&bar->b_cycle, cycle, NULL, 0);
ret = _thr_umtx_wait(&info.queued, 1, tsp,
ret = _thr_umtx_wait(&info.queued, 1, tsp,
_thr_umtx_wait(&inprogress, tmp, NULL, 0);
ret = _thr_umtx_wait(&pthread->state, state, tsp,
retval = _thr_umtx_wait(&(*sem)->count, 0, &ts2,
_thr_umtx_wait(&curthread->cycle, cycle, NULL, 0);
_thr_umtx_wait(&thread->cycle, tmp, NULL, 0);
int _thr_umtx_wait(volatile umtx_t *mtx, umtx_t exp,