2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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.
11 #ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_RW_LOCK_WRAPPER_H_
12 #define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_RW_LOCK_WRAPPER_H_
14 #include "webrtc/base/thread_annotations.h"
16 // Note, Windows pre-Vista version of RW locks are not supported natively. For
17 // these OSs regular critical sections have been used to approximate RW lock
18 // functionality and will therefore have worse performance.
22 class LOCKABLE RWLockWrapper {
24 static RWLockWrapper* CreateRWLock();
25 virtual ~RWLockWrapper() {}
27 virtual void AcquireLockExclusive() EXCLUSIVE_LOCK_FUNCTION() = 0;
28 virtual void ReleaseLockExclusive() UNLOCK_FUNCTION() = 0;
30 virtual void AcquireLockShared() SHARED_LOCK_FUNCTION() = 0;
31 virtual void ReleaseLockShared() UNLOCK_FUNCTION() = 0;
34 // RAII extensions of the RW lock. Prevents Acquire/Release missmatches and
35 // provides more compact locking syntax.
36 class SCOPED_LOCKABLE ReadLockScoped {
38 ReadLockScoped(RWLockWrapper& rw_lock) SHARED_LOCK_FUNCTION(rw_lock)
40 rw_lock_.AcquireLockShared();
43 ~ReadLockScoped() UNLOCK_FUNCTION() {
44 rw_lock_.ReleaseLockShared();
48 RWLockWrapper& rw_lock_;
51 class SCOPED_LOCKABLE WriteLockScoped {
53 WriteLockScoped(RWLockWrapper& rw_lock) EXCLUSIVE_LOCK_FUNCTION(rw_lock)
55 rw_lock_.AcquireLockExclusive();
58 ~WriteLockScoped() UNLOCK_FUNCTION() {
59 rw_lock_.ReleaseLockExclusive();
63 RWLockWrapper& rw_lock_;
68 #endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_RW_LOCK_WRAPPER_H_