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#include "pthread_impl.h"
int pthread_rwlock_unlock(pthread_rwlock_t *rw)
{
int val, cnt, waiters, new, priv = rw->_rw_shared^128;
do {
val = rw->_rw_lock;
cnt = val & 0x7fffffff;
waiters = rw->_rw_waiters;
new = (cnt == 0x7fffffff || cnt == 1) ? 0 : val-1;
} while (a_cas(&rw->_rw_lock, val, new) != val);
if (!new && (waiters || val<0))
__wake(&rw->_rw_lock, cnt, priv);
return 0;
}
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