Delete unused class SharedExclusiveLock.

webrtc/base/sharedexclusivelock.h

-/*
- *  Copyright 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_BASE_SHAREDEXCLUSIVELOCK_H_
-#define WEBRTC_BASE_SHAREDEXCLUSIVELOCK_H_
-
-#include "webrtc/base/constructormagic.h"
-#include "webrtc/base/criticalsection.h"
-#include "webrtc/base/event.h"
-
-namespace rtc {
-
-// This class provides shared-exclusive lock. It can be used in cases like
-// multiple-readers/single-writer model.
-class LOCKABLE SharedExclusiveLock {
- public:
-  SharedExclusiveLock();
-
-  // Locking/unlocking methods. It is encouraged to use SharedScope or
-  // ExclusiveScope for protection.
-  void LockExclusive() EXCLUSIVE_LOCK_FUNCTION();
-  void UnlockExclusive() UNLOCK_FUNCTION();
-  void LockShared();
-  void UnlockShared();
-
- private:
-  rtc::CriticalSection cs_exclusive_;
-  rtc::CriticalSection cs_shared_;
-  rtc::Event shared_count_is_zero_;
-  int shared_count_;
-
-  RTC_DISALLOW_COPY_AND_ASSIGN(SharedExclusiveLock);
-};
-
-class SCOPED_LOCKABLE SharedScope {
- public:
-  explicit SharedScope(SharedExclusiveLock* lock) SHARED_LOCK_FUNCTION(lock)
-      : lock_(lock) {
-    lock_->LockShared();
-  }
-
-  ~SharedScope() UNLOCK_FUNCTION() { lock_->UnlockShared(); }
-
- private:
-  SharedExclusiveLock* lock_;
-
-  RTC_DISALLOW_COPY_AND_ASSIGN(SharedScope);
-};
-
-class SCOPED_LOCKABLE ExclusiveScope {
- public:
-  explicit ExclusiveScope(SharedExclusiveLock* lock)
-      EXCLUSIVE_LOCK_FUNCTION(lock)
-      : lock_(lock) {
-    lock_->LockExclusive();
-  }
-
-  ~ExclusiveScope() UNLOCK_FUNCTION() { lock_->UnlockExclusive(); }
-
- private:
-  SharedExclusiveLock* lock_;
-
-  RTC_DISALLOW_COPY_AND_ASSIGN(ExclusiveScope);
-};
-
-}  // namespace rtc
-
-#endif  // WEBRTC_BASE_SHAREDEXCLUSIVELOCK_H_