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

diff --git a/src/thread/sem_timedwait.c b/src/thread/sem_timedwait.c
index e6604364..e6c2495a 100644
--- a/src/thread/sem_timedwait.c
+++ b/src/thread/sem_timedwait.c

@@ -7,7 +7,7 @@ int sem_timedwait(sem_t *sem, const struct timespec *at)

for (;;) {

if (a_fetch_add(sem->__val, -1) > 0) return 0;

- val = a_fetch_add(sem->__val, 1);

+ val = a_fetch_add(sem->__val, 1)+1;

CANCELPT_BEGIN;

if (val <= 0 && __timedwait(sem->__val, val, CLOCK_REALTIME, at, 0) == ETIMEDOUT) {

errno = ETIMEDOUT;