diff options
Diffstat (limited to 'src/thread/sem_post.c')
| -rw-r--r-- | src/thread/sem_post.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/thread/sem_post.c b/src/thread/sem_post.c index 148ab780..14a2dfe2 100644 --- a/src/thread/sem_post.c +++ b/src/thread/sem_post.c @@ -7,6 +7,10 @@ int sem_post(sem_t *sem) do { val = sem->__val[0]; waiters = sem->__val[1]; + if (val == SEM_VALUE_MAX) { + errno = EOVERFLOW; + return -1; + } } while (a_cas(sem->__val, val, val+1+(val<0)) != val); if (val<0 || waiters) __wake(sem->__val, 1, 0); return 0; |