source:
azure_iot_hub_mbedtls/trunk/musl-1.1.18/src/thread/pthread_rwlock_unlock.c@
413
Last change on this file since 413 was 398, checked in by , 5 years ago | |
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File size: 404 bytes |
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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 | } |
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