1 #include "pthread_impl.h"
3 int pthread_rwlock_unlock(pthread_rwlock_t *rw)
5 int val, cnt, waiters, new;
9 cnt = val & 0x7fffffff;
10 waiters = rw->_rw_waiters;
11 new = (cnt == 0x7fffffff || cnt == 1) ? 0 : val-1;
12 } while (a_cas(&rw->_rw_lock, val, new) != val);
14 if (!new && (waiters || val<0))
15 __wake(&rw->_rw_lock, cnt, 0);