f048872e91
migrating talk/base to webrtc/base. BUG=N/A R=niklas.enbom@webrtc.org Review URL: https://webrtc-codereview.appspot.com/17479005 git-svn-id: http://webrtc.googlecode.com/svn/trunk@6129 4adac7df-926f-26a2-2b94-8c16560cd09d
77 lines
1.8 KiB
C++
77 lines
1.8 KiB
C++
/*
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* Copyright 2011 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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#ifndef WEBRTC_BASE_SHAREDEXCLUSIVELOCK_H_
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#define WEBRTC_BASE_SHAREDEXCLUSIVELOCK_H_
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#include "webrtc/base/constructormagic.h"
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#include "webrtc/base/criticalsection.h"
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#include "webrtc/base/event.h"
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namespace rtc {
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// This class provides shared-exclusive lock. It can be used in cases like
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// multiple-readers/single-writer model.
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class SharedExclusiveLock {
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public:
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SharedExclusiveLock();
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// Locking/unlocking methods. It is encouraged to use SharedScope or
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// ExclusiveScope for protection.
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void LockExclusive();
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void UnlockExclusive();
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void LockShared();
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void UnlockShared();
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private:
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rtc::CriticalSection cs_exclusive_;
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rtc::CriticalSection cs_shared_;
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rtc::Event shared_count_is_zero_;
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int shared_count_;
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DISALLOW_COPY_AND_ASSIGN(SharedExclusiveLock);
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};
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class SharedScope {
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public:
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explicit SharedScope(SharedExclusiveLock* lock) : lock_(lock) {
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lock_->LockShared();
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}
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~SharedScope() {
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lock_->UnlockShared();
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}
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private:
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SharedExclusiveLock* lock_;
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DISALLOW_COPY_AND_ASSIGN(SharedScope);
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};
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class ExclusiveScope {
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public:
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explicit ExclusiveScope(SharedExclusiveLock* lock) : lock_(lock) {
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lock_->LockExclusive();
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}
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~ExclusiveScope() {
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lock_->UnlockExclusive();
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}
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private:
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SharedExclusiveLock* lock_;
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DISALLOW_COPY_AND_ASSIGN(ExclusiveScope);
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};
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} // namespace rtc
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#endif // WEBRTC_BASE_SHAREDEXCLUSIVELOCK_H_
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