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-rw-r--r--src/thread/sem_timedwait.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/thread/sem_timedwait.c b/src/thread/sem_timedwait.c
index bfcb6dcd..df5f3a6c 100644
--- a/src/thread/sem_timedwait.c
+++ b/src/thread/sem_timedwait.c
@@ -8,6 +8,11 @@ static void cleanup(void *p)
int sem_timedwait(sem_t *restrict sem, const struct timespec *restrict at)
{
+ if (!sem_trywait(sem)) return 0;
+
+ int spins = 100;
+ while (spins-- && sem->__val[0] <= 0) a_spin();
+
while (sem_trywait(sem)) {
int r;
a_inc(sem->__val+1);