musl - musl - an implementation of the standard library for Linux-based systems

diff --git a/src/thread/sem_post.c b/src/thread/sem_post.c
index 5c2517f2..1c8f763c 100644
--- a/src/thread/sem_post.c
+++ b/src/thread/sem_post.c

@@ -16,6 +16,6 @@ int sem_post(sem_t *sem)

if (waiters <= 1)

new &= ~0x80000000;

} while (a_cas(sem->__val, val, new) != val);

- if (val<0) __wake(sem->__val, waiters>1 ? 1 : -1, priv);

+ if (val<0 || waiters) __wake(sem->__val, waiters>1 ? 1 : -1, priv);

return 0;

}