| /* |
| * 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_INCLUDE_RW_LOCK_WRAPPER_H_ |
| #define WEBRTC_SYSTEM_WRAPPERS_INCLUDE_RW_LOCK_WRAPPER_H_ |
| |
| #include "webrtc/base/thread_annotations.h" |
| |
| // Note, Windows pre-Vista version of RW locks are not supported natively. For |
| // these OSs regular critical sections have been used to approximate RW lock |
| // functionality and will therefore have worse performance. |
| |
| namespace webrtc { |
| |
| class LOCKABLE RWLockWrapper { |
| public: |
| static RWLockWrapper* CreateRWLock(); |
| virtual ~RWLockWrapper() {} |
| |
| virtual void AcquireLockExclusive() EXCLUSIVE_LOCK_FUNCTION() = 0; |
| virtual void ReleaseLockExclusive() UNLOCK_FUNCTION() = 0; |
| |
| virtual void AcquireLockShared() SHARED_LOCK_FUNCTION() = 0; |
| virtual void ReleaseLockShared() UNLOCK_FUNCTION() = 0; |
| }; |
| |
| // RAII extensions of the RW lock. Prevents Acquire/Release missmatches and |
| // provides more compact locking syntax. |
| class SCOPED_LOCKABLE ReadLockScoped { |
| public: |
| ReadLockScoped(RWLockWrapper& rw_lock) SHARED_LOCK_FUNCTION(rw_lock) |
| : rw_lock_(rw_lock) { |
| rw_lock_.AcquireLockShared(); |
| } |
| |
| ~ReadLockScoped() UNLOCK_FUNCTION() { |
| rw_lock_.ReleaseLockShared(); |
| } |
| |
| private: |
| RWLockWrapper& rw_lock_; |
| }; |
| |
| class SCOPED_LOCKABLE WriteLockScoped { |
| public: |
| WriteLockScoped(RWLockWrapper& rw_lock) EXCLUSIVE_LOCK_FUNCTION(rw_lock) |
| : rw_lock_(rw_lock) { |
| rw_lock_.AcquireLockExclusive(); |
| } |
| |
| ~WriteLockScoped() UNLOCK_FUNCTION() { |
| rw_lock_.ReleaseLockExclusive(); |
| } |
| |
| private: |
| RWLockWrapper& rw_lock_; |
| }; |
| |
| } // namespace webrtc |
| |
| #endif // WEBRTC_SYSTEM_WRAPPERS_INCLUDE_RW_LOCK_WRAPPER_H_ |