X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fthread%2Fsem_trywait.c;h=beb7aa5d3d359b793e11bf106ee21dda92feef73;hb=016a5dc1925a66c7d1ffc14b862b1342f399cfda;hp=c5370c70a7f397751d7a124df03a5c1afe78eec9;hpb=cfe581b6bc795e3f00ac30791314ec0f9be4b4ad;p=musl

diff --git a/src/thread/sem_trywait.c b/src/thread/sem_trywait.c
index c5370c70..beb7aa5d 100644
--- a/src/thread/sem_trywait.c
+++ b/src/thread/sem_trywait.c
@@ -3,9 +3,8 @@
 
 int sem_trywait(sem_t *sem)
 {
-	int val = a_fetch_add(sem->__val, -1);
-	if (val > 0) return 0;
-	if (!a_fetch_add(sem->__val, 1))
+	if (a_fetch_add(sem->__val, -1) > 0) return 0;
+	if (!a_fetch_add(sem->__val, 1) && sem->__val[1])
 		__wake(sem->__val, 1, 0);
 	errno = EAGAIN;
 	return -1;