67 lines
2.0 KiB
C++
67 lines
2.0 KiB
C++
/*
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* Copyright (c) 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 RTC_BASE_SYNCHRONIZATION_RW_LOCK_WRAPPER_H_
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#define RTC_BASE_SYNCHRONIZATION_RW_LOCK_WRAPPER_H_
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#include "rtc_base/thread_annotations.h"
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// Note, Windows pre-Vista version of RW locks are not supported natively. For
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// these OSs regular critical sections have been used to approximate RW lock
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// functionality and will therefore have worse performance.
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namespace webrtc {
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class RTC_LOCKABLE RWLockWrapper {
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public:
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static RWLockWrapper* CreateRWLock();
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virtual ~RWLockWrapper() {}
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virtual void AcquireLockExclusive() RTC_EXCLUSIVE_LOCK_FUNCTION() = 0;
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virtual void ReleaseLockExclusive() RTC_UNLOCK_FUNCTION() = 0;
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virtual void AcquireLockShared() RTC_SHARED_LOCK_FUNCTION() = 0;
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virtual void ReleaseLockShared() RTC_UNLOCK_FUNCTION() = 0;
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};
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// RAII extensions of the RW lock. Prevents Acquire/Release missmatches and
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// provides more compact locking syntax.
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class RTC_SCOPED_LOCKABLE ReadLockScoped {
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public:
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explicit ReadLockScoped(RWLockWrapper& rw_lock)
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RTC_SHARED_LOCK_FUNCTION(rw_lock)
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: rw_lock_(rw_lock) {
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rw_lock_.AcquireLockShared();
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}
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~ReadLockScoped() RTC_UNLOCK_FUNCTION() { rw_lock_.ReleaseLockShared(); }
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private:
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RWLockWrapper& rw_lock_;
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};
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class RTC_SCOPED_LOCKABLE WriteLockScoped {
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public:
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explicit WriteLockScoped(RWLockWrapper& rw_lock)
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RTC_EXCLUSIVE_LOCK_FUNCTION(rw_lock)
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: rw_lock_(rw_lock) {
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rw_lock_.AcquireLockExclusive();
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}
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~WriteLockScoped() RTC_UNLOCK_FUNCTION() { rw_lock_.ReleaseLockExclusive(); }
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private:
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RWLockWrapper& rw_lock_;
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};
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} // namespace webrtc
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#endif // RTC_BASE_SYNCHRONIZATION_RW_LOCK_WRAPPER_H_
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