X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=blobdiff_plain;f=src%2Fthread%2Fpthread_cond_signal.c;h=e8ed71cc6a1f6a7c140501c994841cbcb1e2f28a;hp=574f5c79bab9a6e04a3078a1748a2a45f2901d39;hb=4b153ac42428447a148e6da543ebe6df017078db;hpb=e882756311c7b06e59fcc8e582f03852b7dcfd30

diff --git a/src/thread/pthread_cond_signal.c b/src/thread/pthread_cond_signal.c
index 574f5c79..e8ed71cc 100644
--- a/src/thread/pthread_cond_signal.c
+++ b/src/thread/pthread_cond_signal.c
@@ -2,7 +2,8 @@
 
 int pthread_cond_signal(pthread_cond_t *c)
 {
-	c->_c_block = 0;
-	__wake(&c->_c_block, 1, 0);
+	int w = c->_c_waiters;
+	if (a_swap(&c->_c_block, 0) || w)
+		__wake(&c->_c_block, 1, 0);
 	return 0;
 }