X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=blobdiff_plain;f=src%2Fthread%2Fpthread_cond_broadcast.c;h=9c6a462b781bd5bb6435df47f6890c02c41b2f4a;hp=1d378c0b271b0420044a5dc842eba04f6c3887e0;hb=1fa05210100caefc8546746e08358d81739f4b41;hpb=e882756311c7b06e59fcc8e582f03852b7dcfd30

diff --git a/src/thread/pthread_cond_broadcast.c b/src/thread/pthread_cond_broadcast.c
index 1d378c0b..9c6a462b 100644
--- a/src/thread/pthread_cond_broadcast.c
+++ b/src/thread/pthread_cond_broadcast.c
@@ -2,7 +2,42 @@
 
 int pthread_cond_broadcast(pthread_cond_t *c)
 {
-	c->_c_block = 0;
-	__wake(&c->_c_block, -1, 0);
+	pthread_mutex_t *m;
+
+	if (!c->_c_waiters) return 0;
+
+	a_inc(&c->_c_seq);
+
+	/* If cond var is process-shared, simply wake all waiters. */
+	if (c->_c_mutex == (void *)-1) {
+		__wake(&c->_c_seq, -1, 0);
+		return 0;
+	}
+
+	/* Block waiters from returning so we can use the mutex. */
+	while (a_swap(&c->_c_lock, 1))
+		__wait(&c->_c_lock, &c->_c_lockwait, 1, 1);
+	if (!c->_c_waiters)
+		goto out;
+	m = c->_c_mutex;
+
+	/* Move waiter count to the mutex */
+	for (;;) {
+		int w = c->_c_waiters2;
+		a_fetch_add(&m->_m_waiters, w);
+		if (a_cas(&c->_c_waiters2, w, 0) == w) break;
+		a_fetch_add(&m->_m_waiters, -w);
+	}
+
+	/* Perform the futex requeue, waking one waiter unless we know
+	 * that the calling thread holds the mutex. */
+	__syscall(SYS_futex, &c->_c_seq, FUTEX_REQUEUE,
+		!m->_m_type || (m->_m_lock&INT_MAX)!=pthread_self()->tid,
+		INT_MAX, &m->_m_lock);
+
+out:
+	a_store(&c->_c_lock, 0);
+	if (c->_c_lockwait) __wake(&c->_c_lock, 1, 0);
+
 	return 0;
 }