02bafc6379
Permits CHECKing/DCHECKing that methods are being accessed in a thread-safe manner, even if they are not used by one single thread (thread pools such as VideoToolbox OK). BUG= R=danilchap@webrtc.org, tommi@webrtc.org Review URL: https://codereview.webrtc.org/2097403002 . Cr-Commit-Position: refs/heads/master@{#13358}
47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
/*
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* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "webrtc/base/race_checker.h"
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namespace rtc {
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RaceChecker::RaceChecker() {}
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bool RaceChecker::Acquire() const {
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const PlatformThreadRef current_thread = CurrentThreadRef();
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// Set new accessing thread if this is a new use.
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if (access_count_++ == 0)
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accessing_thread_ = current_thread;
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// If this is being used concurrently this check will fail for the second
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// thread entering since it won't set the thread. Recursive use of checked
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// methods are OK since the accessing thread remains the same.
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const PlatformThreadRef accessing_thread = accessing_thread_;
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return IsThreadRefEqual(accessing_thread, current_thread);
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}
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void RaceChecker::Release() const {
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--access_count_;
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}
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namespace internal {
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RaceCheckerScope::RaceCheckerScope(const RaceChecker* race_checker)
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: race_checker_(race_checker), race_check_ok_(race_checker->Acquire()) {}
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bool RaceCheckerScope::RaceDetected() const {
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return !race_check_ok_;
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}
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RaceCheckerScope::~RaceCheckerScope() {
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race_checker_->Release();
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}
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} // namespace internal
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} // namespace rtc
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