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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 "webrtc/base/thread_annotations.h"
#include "webrtc/common_types.h"
namespace webrtc {
class LOCKABLE 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() EXCLUSIVE_LOCK_FUNCTION() = 0;
// Returns a grabbed lock, end of critical section.
virtual void Leave() UNLOCK_FUNCTION() = 0;
};
// RAII extension of the critical section. Prevents Enter/Leave mismatches and
// provides more compact critical section syntax.
class SCOPED_LOCKABLE CriticalSectionScoped {
public:
explicit CriticalSectionScoped(CriticalSectionWrapper* critsec)
EXCLUSIVE_LOCK_FUNCTION(critsec)
: ptr_crit_sec_(critsec) {
ptr_crit_sec_->Enter();
}
~CriticalSectionScoped() UNLOCK_FUNCTION() { ptr_crit_sec_->Leave(); }
private:
CriticalSectionWrapper* ptr_crit_sec_;
};
} // namespace webrtc
#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CRITICAL_SECTION_WRAPPER_H_
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