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 // Note, Windows pre-Vista version of RW locks are not supported natively. For
15 // these OSs regular critical sections have been used to approximate RW lock
16 // functionality and will therefore have worse performance.
22 static RWLockWrapper* CreateRWLock();
23 virtual ~RWLockWrapper() {}
25 virtual void AcquireLockExclusive() = 0;
26 virtual void ReleaseLockExclusive() = 0;
28 virtual void AcquireLockShared() = 0;
29 virtual void ReleaseLockShared() = 0;
32 // RAII extensions of the RW lock. Prevents Acquire/Release missmatches and
33 // provides more compact locking syntax.
34 class ReadLockScoped {
36 ReadLockScoped(RWLockWrapper& rw_lock)
39 rw_lock_.AcquireLockShared();
43 rw_lock_.ReleaseLockShared();
47 RWLockWrapper& rw_lock_;
50 class WriteLockScoped {
52 WriteLockScoped(RWLockWrapper& rw_lock)
55 rw_lock_.AcquireLockExclusive();
59 rw_lock_.ReleaseLockExclusive();
63 RWLockWrapper& rw_lock_;
68 #endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_RW_LOCK_WRAPPER_H_