source:
asp3_tinet_ecnl_arm/trunk/musl-1.1.18/src/thread/sem_post.c
Last change on this file was 352, checked in by , 6 years ago | |
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File size: 366 bytes |
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1 | #include <semaphore.h> |
2 | #include "pthread_impl.h" |
3 | |
4 | int sem_post(sem_t *sem) |
5 | { |
6 | int val, waiters, priv = sem->__val[2]; |
7 | do { |
8 | val = sem->__val[0]; |
9 | waiters = sem->__val[1]; |
10 | if (val == SEM_VALUE_MAX) { |
11 | errno = EOVERFLOW; |
12 | return -1; |
13 | } |
14 | } while (a_cas(sem->__val, val, val+1+(val<0)) != val); |
15 | if (val<0 || waiters) __wake(sem->__val, 1, priv); |
16 | return 0; |
17 | } |
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