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