X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fthread%2Fsem_trywait.c;fp=src%2Fthread%2Fsem_trywait.c;h=c5370c70a7f397751d7a124df03a5c1afe78eec9;hb=cfe581b6bc795e3f00ac30791314ec0f9be4b4ad;hp=d0e928ef67d2048f4bbf1f1214a30407d8dbe7c8;hpb=81af503610761a69476a3adbe8341fa8b6d078aa;p=musl

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;
 }