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_SOURCE_RW_LOCK_WINDOWS_H_ 12 #define WEBRTC_SYSTEM_WRAPPERS_SOURCE_RW_LOCK_WINDOWS_H_ 13 14 #include "rw_lock_wrapper.h" 15 16 #include <Windows.h> 17 18 #if !defined(RTL_SRWLOCK_INIT) 19 typedef struct _RTL_SRWLOCK 20 { 21 void* Ptr; 22 } RTL_SRWLOCK, *PRTL_SRWLOCK; 23 typedef RTL_SRWLOCK SRWLOCK, *PSRWLOCK; 24 #endif 25 26 namespace webrtc { 27 class CriticalSectionWrapper; 28 class ConditionVariableWrapper; 29 30 typedef void (WINAPI *PInitializeSRWLock)(PSRWLOCK); 31 32 typedef void (WINAPI *PAcquireSRWLockExclusive)(PSRWLOCK); 33 typedef void (WINAPI *PReleaseSRWLockExclusive)(PSRWLOCK); 34 35 typedef void (WINAPI *PAcquireSRWLockShared)(PSRWLOCK); 36 typedef void (WINAPI *PReleaseSRWLockShared)(PSRWLOCK); 37 38 39 class RWLockWindows :public RWLockWrapper 40 { 41 public: 42 RWLockWindows(); 43 virtual ~RWLockWindows(); 44 45 virtual void AcquireLockExclusive(); 46 virtual void ReleaseLockExclusive(); 47 48 virtual void AcquireLockShared(); 49 virtual void ReleaseLockShared(); 50 51 protected: 52 virtual int Init(); 53 54 private: 55 // For native implementation. 56 static bool _winSupportRWLockPrimitive; 57 SRWLOCK _lock; 58 59 // Genric implementation, fallback if native is not supported. 60 CriticalSectionWrapper* _critSectPtr; 61 ConditionVariableWrapper* _readCondPtr; 62 ConditionVariableWrapper* _writeCondPtr; 63 64 int _readersActive; 65 bool _writerActive; 66 int _readersWaiting; 67 int _writersWaiting; 68 }; 69 } // namespace webrtc 70 71 #endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_RW_LOCK_WINDOWS_H_ 72
