X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=blobdiff_plain;f=src%2Fthread%2Fpthread_cond_broadcast.c;h=848e288f5ea6dc25de38b901210bbace6f2bc2de;hp=6002c53507be55152328caacd3394614daa0dffd;hb=af3330d7648627816fbc82aa3247419e8a528230;hpb=4b153ac42428447a148e6da543ebe6df017078db

diff --git a/src/thread/pthread_cond_broadcast.c b/src/thread/pthread_cond_broadcast.c
index 6002c535..848e288f 100644
--- a/src/thread/pthread_cond_broadcast.c
+++ b/src/thread/pthread_cond_broadcast.c
@@ -2,8 +2,38 @@
 
 int pthread_cond_broadcast(pthread_cond_t *c)
 {
-	int w = c->_c_waiters;
-	if (a_swap(&c->_c_block, 0) || w)
-		__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 */
+	a_fetch_add(&m->_m_waiters, c->_c_waiters2);
+	c->_c_waiters2 = 0;
+
+	/* 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;
 }