Protect MessageQueue stop field with a critical section to avoid data races.

webrtc/build/sanitizers/tsan_suppressions_webrtc.cc

 /*
  *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 // This file contains the WebRTC suppressions for ThreadSanitizer.
 // Please refer to
 // http://dev.chromium.org/developers/testing/threadsanitizer-tsan-v2
 // for more info.
 
 #if defined(THREAD_SANITIZER)
 
 // Please make sure the code below declares a single string variable
 // kTSanDefaultSuppressions contains TSan suppressions delimited by newlines.
 // See http://dev.chromium.org/developers/testing/threadsanitizer-tsan-v2
 // for the instructions on writing suppressions.
 char kTSanDefaultSuppressions[] =
 
 // WebRTC specific suppressions.
 
 // Split up suppressions covered previously by thread.cc and messagequeue.cc.
-"race:rtc::MessageQueue::Quit\n"
 "race:vp8cx_remove_encoder_threads\n"
 "race:third_party/libvpx/source/libvpx/vp9/common/vp9_scan.h\n"
 
 // Usage of trace callback and trace level is racy in rtc_media_unittests.
 // https://code.google.com/p/webrtc/issues/detail?id=3372
 "race:webrtc::TraceImpl::WriteToFile\n"
 "race:webrtc::VideoEngine::SetTraceFilter\n"
 "race:webrtc::VoiceEngine::SetTraceFilter\n"
 "race:webrtc::Trace::set_level_filter\n"
 "race:webrtc::GetStaticInstance<webrtc::TraceImpl>\n"
@@ skipping 49 matching lines @@
 "race:webrtc::voe::TransmitMixer::EnableStereoChannelSwapping\n"
 
 // Race between InitCpuFlags and TestCpuFlag in libyuv.
 // https://code.google.com/p/libyuv/issues/detail?id=508
 "race:InitCpuFlags\n"
 
 // End of suppressions.
 ;  // Please keep this semicolon.
 
 #endif  // THREAD_SANITIZER