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-rw-r--r--src/thread/sem_trywait.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/thread/sem_trywait.c b/src/thread/sem_trywait.c
index d0e928ef..c5370c70 100644
--- a/src/thread/sem_trywait.c
+++ b/src/thread/sem_trywait.c
@@ -5,7 +5,8 @@ int sem_trywait(sem_t *sem)
{
int val = a_fetch_add(sem->__val, -1);
if (val > 0) return 0;
- a_inc(sem->__val);
+ if (!a_fetch_add(sem->__val, 1))
+ __wake(sem->__val, 1, 0);
errno = EAGAIN;
return -1;
}