1 /* 2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CRITICAL_SECTION_WRAPPER_H_ 12 #define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CRITICAL_SECTION_WRAPPER_H_ 13 14 // If the critical section is heavily contended it may be beneficial to use 15 // read/write locks instead. 16 17 #include "common_types.h" 18 19 namespace webrtc { 20 class CriticalSectionWrapper 21 { 22 public: 23 // Factory method, constructor disabled 24 static CriticalSectionWrapper* CreateCriticalSection(); 25 ~CriticalSectionWrapper()26 virtual ~CriticalSectionWrapper() {} 27 28 // Tries to grab lock, beginning of a critical section. Will wait for the 29 // lock to become available if the grab failed. 30 virtual void Enter() = 0; 31 32 // Returns a grabbed lock, end of critical section. 33 virtual void Leave() = 0; 34 }; 35 36 // RAII extension of the critical section. Prevents Enter/Leave missmatches and 37 // provides more compact critical section syntax. 38 class CriticalSectionScoped 39 { 40 public: CriticalSectionScoped(CriticalSectionWrapper & critsec)41 CriticalSectionScoped(CriticalSectionWrapper& critsec) 42 : 43 _ptrCritSec(&critsec) 44 { 45 _ptrCritSec->Enter(); 46 } 47 ~CriticalSectionScoped()48 ~CriticalSectionScoped() 49 { 50 if (_ptrCritSec) 51 { 52 Leave(); 53 } 54 } 55 56 private: Leave()57 void Leave() 58 { 59 _ptrCritSec->Leave(); 60 _ptrCritSec = 0; 61 } 62 63 CriticalSectionWrapper* _ptrCritSec; 64 }; 65 } // namespace webrtc 66 #endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_CRITICAL_SECTION_WRAPPER_H_ 67