umtx_abs_timeout_init
umtx_abs_timeout_init(timo, clockid, absolute, args->ts);
umtx_abs_timeout_init(&timo, CLOCK_REALTIME, 0, timeout);
umtx_abs_timeout_init(&timo, clockid,
umtx_abs_timeout_init(timo, umtxtime->_clockid,
umtx_abs_timeout_init(&timo, CLOCK_REALTIME, 0, timeout);
void umtx_abs_timeout_init(struct umtx_abs_timeout *, int, int,