40 lines
1.0 KiB
C++
40 lines
1.0 KiB
C++
/*
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* Copyright 2020 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 "rtc_base/synchronization/mutex.h"
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#include "rtc_base/checks.h"
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#include "rtc_base/synchronization/yield.h"
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namespace webrtc {
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#if !defined(WEBRTC_ABSL_MUTEX)
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void GlobalMutex::Lock() {
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while (mutex_locked_.exchange(1)) {
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YieldCurrentThread();
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}
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}
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void GlobalMutex::Unlock() {
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int old = mutex_locked_.exchange(0);
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RTC_DCHECK_EQ(old, 1) << "Unlock called without calling Lock first";
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}
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GlobalMutexLock::GlobalMutexLock(GlobalMutex* mutex) : mutex_(mutex) {
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mutex_->Lock();
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}
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GlobalMutexLock::~GlobalMutexLock() {
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mutex_->Unlock();
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}
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#endif // #if !defined(WEBRTC_ABSL_MUTEX)
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} // namespace webrtc
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