From: Rich Felker <dalias@aerifal.cx>
Date: Wed, 28 Sep 2011 16:47:15 +0000 (-0400)
Subject: barrier destroy must also wait for threads in other processes exiting barrier
X-Git-Url: http://nsz.repo.hu/git/?a=commitdiff_plain;ds=sidebyside;h=8f4a115e7d38c31ad8d8c7233eaff2db270aebd8;hp=f0a8d60d32b7d6a093596abdbb9711e64eff2594;p=musl

barrier destroy must also wait for threads in other processes exiting barrier

the vm lock only waits for threads in the same process exiting.
actually this fix is not enough, but it's a start...
---

diff --git a/src/thread/pthread_barrier_destroy.c b/src/thread/pthread_barrier_destroy.c
index f82664d5..3ebc2b39 100644
--- a/src/thread/pthread_barrier_destroy.c
+++ b/src/thread/pthread_barrier_destroy.c
@@ -5,6 +5,8 @@ void __vm_lock(int), __vm_unlock(void);
 int pthread_barrier_destroy(pthread_barrier_t *b)
 {
 	if (b->_b_limit < 0) {
+		int seq = b->_b_seq;
+		if (seq & 1) __wait(&b->_b_seq, 0, seq, 0);
 		__vm_lock(-1);
 		__vm_unlock();
 	}