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report sem value overflows in sem_post

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this is not required by the standard, but it's nicer than corrupting
the state and rather inexpensive.
This commit is contained in:
Rich Felker 2011-10-26 00:28:47 -04:00
commit 26120950e2
1 changed files with 4 additions and 0 deletions
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4
src/thread/sem_post.c
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@ -7,6 +7,10 @@ int sem_post(sem_t *sem)
do { do {
val = sem->__val[0]; val = sem->__val[0];
waiters = sem->__val[1]; waiters = sem->__val[1];
if (val == SEM_VALUE_MAX) {
errno = EOVERFLOW;
return -1;
}
} while (a_cas(sem->__val, val, val+1+(val<0)) != val); } while (a_cas(sem->__val, val, val+1+(val<0)) != val);
if (val<0 || waiters) __wake(sem->__val, 1, 0); if (val<0 || waiters) __wake(sem->__val, 1, 0);
return 0; return 0;