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-rw-r--r--src/thread/sem_trywait.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/thread/sem_trywait.c b/src/thread/sem_trywait.c
index 55d90075..04edf46b 100644
--- a/src/thread/sem_trywait.c
+++ b/src/thread/sem_trywait.c
@@ -3,8 +3,8 @@
 
 int sem_trywait(sem_t *sem)
 {
-	int val = sem->__val[0];
-	if (val>0) {
+	int val;
+	while ((val=sem->__val[0]) > 0) {
 		int new = val-1-(val==1 && sem->__val[1]);
 		if (a_cas(sem->__val, val, new)==val) return 0;
 	}