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Diffstat (limited to '')
-rw-r--r-- | libc-top-half/musl/src/thread/pthread_rwlock_unlock.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/thread/pthread_rwlock_unlock.c b/libc-top-half/musl/src/thread/pthread_rwlock_unlock.c new file mode 100644 index 0000000..9ae27ad --- /dev/null +++ b/libc-top-half/musl/src/thread/pthread_rwlock_unlock.c @@ -0,0 +1,20 @@ +#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; +} + +weak_alias(__pthread_rwlock_unlock, pthread_rwlock_unlock); |