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-rw-r--r--src/thread/pthread_cond_signal.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/thread/pthread_cond_signal.c b/src/thread/pthread_cond_signal.c
index 574f5c79..a0211287 100644
--- a/src/thread/pthread_cond_signal.c
+++ b/src/thread/pthread_cond_signal.c
@@ -2,7 +2,7 @@
 
 int pthread_cond_signal(pthread_cond_t *c)
 {
-	c->_c_block = 0;
-	__wake(&c->_c_block, 1, 0);
+	if (a_swap(&c->_c_block, 0));
+		__wake(&c->_c_block, 1, 0);
 	return 0;
 }