Move files in wtf/ to platform/wtf/ (Part 7).

third_party/WebKit/Source/wtf/ThreadSafeRefCounted.h

-/*
- * Copyright (C) 2007, 2008, 2010 Apple Inc. All rights reserved.
- * Copyright (C) 2007 Justin Haygood (jhaygood@reaktix.com)
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1.  Redistributions of source code must retain the above copyright
- *     notice, this list of conditions and the following disclaimer.
- * 2.  Redistributions in binary form must reproduce the above copyright
- *     notice, this list of conditions and the following disclaimer in the
- *     documentation and/or other materials provided with the distribution.
- * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
- *     its contributors may be used to endorse or promote products derived
- *     from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
 
-#ifndef ThreadSafeRefCounted_h
-#define ThreadSafeRefCounted_h
+#include "platform/wtf/ThreadSafeRefCounted.h"
 
-#include "wtf/Allocator.h"
-#include "wtf/Atomics.h"
-#include "wtf/DynamicAnnotations.h"
-#include "wtf/Noncopyable.h"
-#include "wtf/WTFExport.h"
-
-namespace WTF {
-
-class WTF_EXPORT ThreadSafeRefCountedBase {
-  WTF_MAKE_NONCOPYABLE(ThreadSafeRefCountedBase);
-  USING_FAST_MALLOC(ThreadSafeRefCountedBase);
-
- public:
-  ThreadSafeRefCountedBase(int initialRefCount = 1)
-      : m_refCount(initialRefCount) {}
-
-  void ref() { atomicIncrement(&m_refCount); }
-
-  bool hasOneRef() { return refCount() == 1; }
-
-  int refCount() const { return static_cast<int const volatile&>(m_refCount); }
-
- protected:
-  // Returns whether the pointer should be freed or not.
-  bool derefBase() {
-    WTF_ANNOTATE_HAPPENS_BEFORE(&m_refCount);
-    if (atomicDecrement(&m_refCount) <= 0) {
-      WTF_ANNOTATE_HAPPENS_AFTER(&m_refCount);
-      return true;
-    }
-    return false;
-  }
-
- private:
-  int m_refCount;
-};
-
-template <class T>
-class ThreadSafeRefCounted : public ThreadSafeRefCountedBase {
- public:
-  void deref() {
-    if (derefBase())
-      delete static_cast<T*>(this);
-  }
-
- protected:
-  ThreadSafeRefCounted() {}
-};
-
-}  // namespace WTF
-
-using WTF::ThreadSafeRefCounted;
-
-#endif  // ThreadSafeRefCounted_h
+// The contents of this header was moved to platform/wtf as part of
+// WTF migration project. See the following post for details:
+// https://groups.google.com/a/chromium.org/d/msg/blink-dev/tLdAZCTlcAA/bYXVT8gYCAAJ