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-rw-r--r--src/thread/sem_post.c4
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;