X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=blobdiff_plain;f=src%2Fthread%2Fpthread_cond_broadcast.c;h=7e5ea91c507401525d4616fe0154b8fb01fe39b8;hp=6002c53507be55152328caacd3394614daa0dffd;hb=c11d1e696723f41d7873332e51fb6858b417fa5f;hpb=4b153ac42428447a148e6da543ebe6df017078db

diff --git a/src/thread/pthread_cond_broadcast.c b/src/thread/pthread_cond_broadcast.c
index 6002c535..7e5ea91c 100644
--- a/src/thread/pthread_cond_broadcast.c
+++ b/src/thread/pthread_cond_broadcast.c
@@ -1,9 +1,48 @@
 #include "pthread_impl.h"
 
+static void unlock(pthread_cond_t *c)
+{
+	a_dec(&c->_c_bcast);
+	if (c->_c_leavers) __wake(&c->_c_bcast, -1, 0);
+}
+
 int pthread_cond_broadcast(pthread_cond_t *c)
 {
-	int w = c->_c_waiters;
-	if (a_swap(&c->_c_block, 0) || w)
+	pthread_mutex_t *m;
+	int w;
+
+	if (!c->_c_waiters) return 0;
+	a_inc(&c->_c_bcast);
+	if (!c->_c_waiters) {
+		unlock(c);
+		return 0;
+	}
+
+	a_store(&c->_c_block, 0);
+
+	m = c->_c_mutex;
+
+	/* If mutex ptr is not available, simply wake all waiters. */
+	if (m == (void *)-1) {
+		unlock(c);
 		__wake(&c->_c_block, -1, 0);
+		return 0;
+	}
+
+	/* Move waiter count to the mutex */
+	for (;;) {
+		w = c->_c_waiters;
+		a_fetch_add(&m->_m_waiters, w);
+		if (a_cas(&c->_c_waiters, 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_block, FUTEX_REQUEUE,
+		!m->_m_type || (m->_m_lock&INT_MAX)!=pthread_self()->tid,
+		INT_MAX, &m->_m_lock);
+
+	unlock(c);
 	return 0;
 }