}
/* Move waiter count to the mutex */
- for (;;) {
- w = c->_c_waiters;
- a_fetch_add(&m->_m_waiters, w);
- if (a_cas(&c->_c_waiters, w, 0) == w) break;
- a_fetch_add(&m->_m_waiters, -w);
- }
+ w = a_swap(&c->_c_waiters, 0);
+ a_fetch_add(&m->_m_waiters, w);
/* Perform the futex requeue, waking one waiter unless we know
* that the calling thread holds the mutex. */