From 0ef7b75c4ba91b6660f0d3d8b51d14d25e3d5bfb Mon Sep 17 00:00:00 2001
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Mon, 23 Mar 2015 01:53:54 +0100
Subject: Fix safety of pthread_once

* sysdeps/generic/pt-once.c (__pthread_once): Call __memory_barrier before
testing the __run field.
---
 sysdeps/generic/pt-once.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'sysdeps/generic')

diff --git a/sysdeps/generic/pt-once.c b/sysdeps/generic/pt-once.c
index 21f097d..cfa45d5 100644
--- a/sysdeps/generic/pt-once.c
+++ b/sysdeps/generic/pt-once.c
@@ -25,6 +25,7 @@
 int
 __pthread_once (pthread_once_t *once_control, void (*init_routine) (void))
 {
+  __memory_barrier ();
   if (once_control->__run == 0)
     {
       __pthread_spin_lock (&once_control->__lock);
-- 
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