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/*
* Copyright (c) 2011 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 WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CRITICAL_SECTION_WRAPPER_H_
#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CRITICAL_SECTION_WRAPPER_H_
// If the critical section is heavily contended it may be beneficial to use
// read/write locks instead.
#include "common_types.h"
namespace webrtc {
class CriticalSectionWrapper
{
public:
// Factory method, constructor disabled
static CriticalSectionWrapper* CreateCriticalSection();
virtual ~CriticalSectionWrapper() {}
// Tries to grab lock, beginning of a critical section. Will wait for the
// lock to become available if the grab failed.
virtual void Enter() = 0;
// Returns a grabbed lock, end of critical section.
virtual void Leave() = 0;
};
// RAII extension of the critical section. Prevents Enter/Leave missmatches and
// provides more compact critical section syntax.
class CriticalSectionScoped
{
public:
CriticalSectionScoped(CriticalSectionWrapper& critsec)
:
_ptrCritSec(&critsec)
{
_ptrCritSec->Enter();
}
~CriticalSectionScoped()
{
if (_ptrCritSec)
{
Leave();
}
}
private:
void Leave()
{
_ptrCritSec->Leave();
_ptrCritSec = 0;
}
CriticalSectionWrapper* _ptrCritSec;
};
} // namespace webrtc
#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CRITICAL_SECTION_WRAPPER_H_
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