From: Jesse Williamson <jwilliamson@suse.de>
Date: Wed, 10 May 2017 11:04:25 +0000 (-0700)
Subject: tools: change compare_exchange_weak to compare_exchange_strong
X-Git-Tag: v12.0.3~39^2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=e573245cf46b487f342f607cd1a73afcf1fe2957;p=ceph.git

tools: change compare_exchange_weak to compare_exchange_strong

On non x86 platforms without a dedicated compare-exchange instruction, std::compare_exchange_weak()
could fail.

Signed-off-by: Jesse Williamson <jwilliamson@suse.de>
---

diff --git a/src/tools/rbd_nbd/rbd-nbd.cc b/src/tools/rbd_nbd/rbd-nbd.cc
index dd16ccd7304f..aa14570e1f35 100644
--- a/src/tools/rbd_nbd/rbd-nbd.cc
+++ b/src/tools/rbd_nbd/rbd-nbd.cc
@@ -125,7 +125,7 @@ private:
   void shutdown()
   {
     bool expected = false;
-    if (terminated.compare_exchange_weak(expected, true)) {
+    if (terminated.compare_exchange_strong(expected, true)) {
       ::shutdown(fd, SHUT_RDWR);
 
       Mutex::Locker l(lock);