fix ABA race in cond vars, improve them overall

[musl] / src / thread / pthread_cond_broadcast.c

diff --git a/src/thread/pthread_cond_broadcast.c b/src/thread/pthread_cond_broadcast.c
index 1d378c0..dec9116 100644 (file)
--- a/src/thread/pthread_cond_broadcast.c
+++ b/src/thread/pthread_cond_broadcast.c
@@ -2,7 +2,7 @@
 
 int pthread_cond_broadcast(pthread_cond_t *c)
 {
-       c->_c_block = 0;
-       __wake(&c->_c_block, -1, 0);
+       a_store(&c->_c_block, 0);
+       if (c->_c_waiters) __wake(&c->_c_block, -1, 0);
        return 0;
 }