From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Date: Wed, 16 Sep 2009 16:44:27 +0000 (-0400)
Subject: Move mb() outside of the synchronize C.S.
X-Git-Tag: v0.1~82
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=4e27f05811113a4444d142811d38e77bcbabbf04;p=userspace-rcu.git

Move mb() outside of the synchronize C.S.

Will be useful for future Q.S. merging. Does not change the RCU g.p. guarantee.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---

diff --git a/urcu-qsbr.c b/urcu-qsbr.c
index e077eac..b387536 100644
--- a/urcu-qsbr.c
+++ b/urcu-qsbr.c
@@ -156,12 +156,12 @@ void synchronize_rcu(void)
 	if (was_online)
 		_rcu_thread_offline();
 
-	internal_urcu_lock();
 	force_mb_all_threads();
+	internal_urcu_lock();
 	STORE_SHARED(urcu_gp_ctr, urcu_gp_ctr + 2);
 	wait_for_quiescent_state();
-	force_mb_all_threads();
 	internal_urcu_unlock();
+	force_mb_all_threads();
 
 	if (was_online)
 		_rcu_thread_online();