/* * 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