| 1 | #include "pthread_impl.h" |
| 2 | |
| 3 | int __pthread_rwlock_unlock(pthread_rwlock_t *rw) |
| 4 | { |
| 5 | int val, cnt, waiters, new, priv = rw->_rw_shared^128; |
| 6 | |
| 7 | do { |
| 8 | val = rw->_rw_lock; |
| 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); |
| 13 | |
| 14 | if (!new && (waiters || val<0)) |
| 15 | __wake(&rw->_rw_lock, cnt, priv); |
| 16 | |
| 17 | return 0; |
| 18 | } |
| 19 | |
| 20 | weak_alias(__pthread_rwlock_unlock, pthread_rwlock_unlock); |