Move webrtc/{base => rtc_base}

webrtc/base/race_checker.cc

-/*
- *  Copyright (c) 2016 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.
- */
-
-#include "webrtc/base/race_checker.h"
-
-namespace rtc {
-
-RaceChecker::RaceChecker() {}
-
-// Note that the implementation here is in itself racy, but we pretend it does
-// not matter because we want this useful in release builds without having to
-// pay the cost of using atomics. A race hitting the race checker is likely to
-// cause access_count_ to diverge from zero and therefore cause the ThreadRef
-// comparison to fail, signaling a race, although it may not be in the exact
-// spot where a race *first* appeared in the code we're trying to protect. There
-// is also a chance that an actual race is missed, however the probability of
-// that has been considered small enough to be an acceptable trade off.
-bool RaceChecker::Acquire() const {
-  const PlatformThreadRef current_thread = CurrentThreadRef();
-  // Set new accessing thread if this is a new use.
-  if (access_count_++ == 0)
-    accessing_thread_ = current_thread;
-  // If this is being used concurrently this check will fail for the second
-  // thread entering since it won't set the thread. Recursive use of checked
-  // methods are OK since the accessing thread remains the same.
-  const PlatformThreadRef accessing_thread = accessing_thread_;
-  return IsThreadRefEqual(accessing_thread, current_thread);
-}
-
-void RaceChecker::Release() const {
-  --access_count_;
-}
-
-namespace internal {
-RaceCheckerScope::RaceCheckerScope(const RaceChecker* race_checker)
-    : race_checker_(race_checker), race_check_ok_(race_checker->Acquire()) {}
-
-bool RaceCheckerScope::RaceDetected() const {
-  return !race_check_ok_;
-}
-
-RaceCheckerScope::~RaceCheckerScope() {
-  race_checker_->Release();
-}
-
-}  // namespace internal
-}  // namespace rtc