/*

 * 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 WTF {

#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 WTF

#if USE(LOCKFREE_THREADSAFESHARED)

using WTF::atomicDecrement;

using WTF::atomicIncrement;

#endif

#endif // Atomics_h