https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61538
--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is the patch which I used for glibc to fix some libstdc++ issues:
>From 2788414e4e6a548766aa7e732fc096f9f572302e Mon Sep 17 00:00:00 2001
From: Andrew Pinski <apin...@cavium.com>
Date: Thu, 1 Nov 2012 23:07:22 -0700
Subject: [PATCH] 2012-11-01 Andrew Pinski <apin...@cavium.com>
Bug #5086
* ports/sysdeps/unix/sysv/linux/mips/nptl/pthread_once.c
(__pthread_once):
Add release barrier before setting once_control to say
initialisation is done.
(clear_once_control): Add release barrier.
---
ChangeLog.CAVIUM | 8 ++++++++
.../unix/sysv/linux/mips/nptl/pthread_once.c | 2 ++
2 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/ChangeLog.CAVIUM b/ChangeLog.CAVIUM
index 8ed42ea..5975430 100644
--- a/ChangeLog.CAVIUM
+++ b/ChangeLog.CAVIUM
@@ -1,3 +1,11 @@
+2012-11-01 Andrew Pinski <apin...@cavium.com>
+
+ Bug #5086
+ * ports/sysdeps/unix/sysv/linux/mips/nptl/pthread_once.c (__pthread_once):
+ Add release barrier before setting once_control to say
+ initialisation is done.
+ (clear_once_control): Add release barrier.
+
2012-10-28 Andrew Pinski <apin...@cavium.com>
Bug #5059
diff --git a/ports/sysdeps/unix/sysv/linux/mips/nptl/pthread_once.c
b/ports/sysdeps/unix/sysv/linux/mips/nptl/pthread_once.c
index 308da8b..c2ef264 100644
--- a/ports/sysdeps/unix/sysv/linux/mips/nptl/pthread_once.c
+++ b/ports/sysdeps/unix/sysv/linux/mips/nptl/pthread_once.c
@@ -28,6 +28,7 @@ clear_once_control (void *arg)
{
pthread_once_t *once_control = (pthread_once_t *) arg;
+ atomic_full_barrier ();
*once_control = 0;
lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE);
}
@@ -80,6 +81,7 @@ __pthread_once (once_control, init_routine)
/* Add one to *once_control. */
+ atomic_full_barrier ();
atomic_increment (once_control);
/* Wake up all other threads. */
--
1.7.4.1
