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55 lines
1.8 KiB
C++
55 lines
1.8 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 WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CRITICAL_SECTION_WRAPPER_H_
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#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CRITICAL_SECTION_WRAPPER_H_
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// If the critical section is heavily contended it may be beneficial to use
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// read/write locks instead.
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#include "webrtc/common_types.h"
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#include "webrtc/system_wrappers/interface/thread_annotations.h"
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namespace webrtc {
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class LOCKABLE CriticalSectionWrapper {
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public:
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// Factory method, constructor disabled
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static CriticalSectionWrapper* CreateCriticalSection();
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virtual ~CriticalSectionWrapper() {}
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// Tries to grab lock, beginning of a critical section. Will wait for the
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// lock to become available if the grab failed.
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virtual void Enter() EXCLUSIVE_LOCK_FUNCTION() = 0;
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// Returns a grabbed lock, end of critical section.
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virtual void Leave() UNLOCK_FUNCTION() = 0;
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};
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// RAII extension of the critical section. Prevents Enter/Leave mismatches and
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// provides more compact critical section syntax.
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class SCOPED_LOCKABLE CriticalSectionScoped {
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public:
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explicit CriticalSectionScoped(CriticalSectionWrapper* critsec)
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EXCLUSIVE_LOCK_FUNCTION(critsec)
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: ptr_crit_sec_(critsec) {
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ptr_crit_sec_->Enter();
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}
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~CriticalSectionScoped() UNLOCK_FUNCTION() { ptr_crit_sec_->Leave(); }
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private:
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CriticalSectionWrapper* ptr_crit_sec_;
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};
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} // namespace webrtc
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#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CRITICAL_SECTION_WRAPPER_H_
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