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