text: 
  /*
  Copyright 2012 Aphid Mobile
  
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
   
     http://www.apache.org/licenses/LICENSE-2.0
  
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  
  */
  /*
   * 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.
   *
   *
   * Note: The implementations of InterlockedIncrement and InterlockedDecrement are based
   * on atomic_increment and atomic_exchange_and_add from the Boost C++ Library. The license
   * is virtually identical to the Apple license above but is included here for completeness.
   *
   * Boost Software License - Version 1.0 - August 17th, 2003
   * 
   * Permission is hereby granted, free of charge, to any person or organization
   * obtaining a copy of the software and accompanying documentation covered by
   * this license (the "Software") to use, reproduce, display, distribute,
   * execute, and transmit the Software, and to prepare derivative works of the
   * Software, and to permit third-parties to whom the Software is furnished to
   * do so, all subject to the following:
   * 
   * The copyright notices in the Software and this entire statement, including
   * the above license grant, this restriction and the following disclaimer,
   * must be included in all copies of the Software, in whole or in part, and
   * all derivative works of the Software, unless such copies or derivative
   * works are solely in the form of machine-executable object code generated by
   * a source language processor.
   * 
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
   * SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
   * FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
   * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   * DEALINGS IN THE SOFTWARE.
   */
  
  #ifndef Atomics_h
  #define Atomics_h
  
  #include "Platform.h"
  
  #if OS(WINDOWS)
  #include <windows.h>
  #elif OS(DARWIN)
  #include <libkern/OSAtomic.h>
  #elif OS(ANDROID)
  #include <cutils/atomic.h>
  #elif COMPILER(GCC) && !OS(SYMBIAN)
  #if (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 2))
  #include <ext/atomicity.h>
  #else
  #include <bits/atomicity.h>
  #endif
  #endif
  
  namespace ATF {
  
  #if OS(WINDOWS)
  #define WTF_USE_LOCKFREE_THREADSAFESHARED 1
  
  #if COMPILER(MINGW) || COMPILER(MSVC7_OR_LOWER) || OS(WINCE)
  inline int atomicIncrement(int* addend) { return InterlockedIncrement(reinterpret_cast<long*>(addend)); }
  inline int atomicDecrement(int* addend) { return InterlockedDecrement(reinterpret_cast<long*>(addend)); }
  #else
  inline int atomicIncrement(int volatile* addend) { return InterlockedIncrement(reinterpret_cast<long volatile*>(addend)); }
  inline int atomicDecrement(int volatile* addend) { return InterlockedDecrement(reinterpret_cast<long volatile*>(addend)); }
  #endif
  
  #elif OS(DARWIN)
  #define WTF_USE_LOCKFREE_THREADSAFESHARED 1
  
  inline int atomicIncrement(int volatile* addend) { return OSAtomicIncrement32Barrier(const_cast<int*>(addend)); }
  inline int atomicDecrement(int volatile* addend) { return OSAtomicDecrement32Barrier(const_cast<int*>(addend)); }
  
  #elif OS(ANDROID)
  
  inline int atomicIncrement(int volatile* addend) { return android_atomic_inc(addend); }
  inline int atomicDecrement(int volatile* addend) { return android_atomic_dec(addend); }
  
  #elif COMPILER(GCC) && !CPU(SPARC64) && !OS(SYMBIAN) // sizeof(_Atomic_word) != sizeof(int) on sparc64 gcc
  #define WTF_USE_LOCKFREE_THREADSAFESHARED 1
  
  inline int atomicIncrement(int volatile* addend) { return __gnu_cxx::__exchange_and_add(addend, 1) + 1; }
  inline int atomicDecrement(int volatile* addend) { return __gnu_cxx::__exchange_and_add(addend, -1) - 1; }
  
  #endif
  
  } // namespace ATF
  
  #if USE(LOCKFREE_THREADSAFESHARED)
  using ATF::atomicDecrement;
  using ATF::atomicIncrement;
  #endif
  
  #endif // Atomics_h
  