mirror of
https://github.com/mollyim/webrtc.git
synced 2025-05-13 05:40:42 +01:00
18523c34b4
Bug: webrtc:11567 Change-Id: Ib8630e0cf1266e7c3f8ce718e1ed9f8848f42ec8 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/178806 Reviewed-by: Tommi <tommi@webrtc.org> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Commit-Queue: Markus Handell <handellm@webrtc.org> Cr-Commit-Position: refs/heads/master@{#31682}
60 lines
1.4 KiB
C++
60 lines
1.4 KiB
C++
/*
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef RTC_BASE_ONE_TIME_EVENT_H_
|
|
#define RTC_BASE_ONE_TIME_EVENT_H_
|
|
|
|
#include "rtc_base/synchronization/mutex.h"
|
|
|
|
namespace webrtc {
|
|
// Provides a simple way to perform an operation (such as logging) one
|
|
// time in a certain scope.
|
|
// Example:
|
|
// OneTimeEvent firstFrame;
|
|
// ...
|
|
// if (firstFrame()) {
|
|
// RTC_LOG(LS_INFO) << "This is the first frame".
|
|
// }
|
|
class OneTimeEvent {
|
|
public:
|
|
OneTimeEvent() {}
|
|
bool operator()() {
|
|
MutexLock lock(&mutex_);
|
|
if (happened_) {
|
|
return false;
|
|
}
|
|
happened_ = true;
|
|
return true;
|
|
}
|
|
|
|
private:
|
|
bool happened_ = false;
|
|
Mutex mutex_;
|
|
};
|
|
|
|
// A non-thread-safe, ligher-weight version of the OneTimeEvent class.
|
|
class ThreadUnsafeOneTimeEvent {
|
|
public:
|
|
ThreadUnsafeOneTimeEvent() {}
|
|
bool operator()() {
|
|
if (happened_) {
|
|
return false;
|
|
}
|
|
happened_ = true;
|
|
return true;
|
|
}
|
|
|
|
private:
|
|
bool happened_ = false;
|
|
};
|
|
|
|
} // namespace webrtc
|
|
|
|
#endif // RTC_BASE_ONE_TIME_EVENT_H_
|