1 /* 2 * Copyright (C) 2007, 2008, 2010 Apple Inc. All rights reserved. 3 * Copyright (C) 2007 Justin Haygood (jhaygood (at) reaktix.com) 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 15 * its contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 19 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 21 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 22 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * 30 * Note: The implementations of InterlockedIncrement and InterlockedDecrement are based 31 * on atomic_increment and atomic_exchange_and_add from the Boost C++ Library. The license 32 * is virtually identical to the Apple license above but is included here for completeness. 33 * 34 * Boost Software License - Version 1.0 - August 17th, 2003 35 * 36 * Permission is hereby granted, free of charge, to any person or organization 37 * obtaining a copy of the software and accompanying documentation covered by 38 * this license (the "Software") to use, reproduce, display, distribute, 39 * execute, and transmit the Software, and to prepare derivative works of the 40 * Software, and to permit third-parties to whom the Software is furnished to 41 * do so, all subject to the following: 42 * 43 * The copyright notices in the Software and this entire statement, including 44 * the above license grant, this restriction and the following disclaimer, 45 * must be included in all copies of the Software, in whole or in part, and 46 * all derivative works of the Software, unless such copies or derivative 47 * works are solely in the form of machine-executable object code generated by 48 * a source language processor. 49 * 50 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 51 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 52 * FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT 53 * SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE 54 * FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, 55 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 56 * DEALINGS IN THE SOFTWARE. 57 */ 58 59 #ifndef Atomics_h 60 #define Atomics_h 61 62 #include "Platform.h" 63 64 #if OS(WINDOWS) 65 #include <windows.h> 66 #elif OS(DARWIN) 67 #include <libkern/OSAtomic.h> 68 #elif OS(ANDROID) 69 #include <cutils/atomic.h> 70 #elif COMPILER(GCC) && !OS(SYMBIAN) 71 #if (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 2)) 72 #include <ext/atomicity.h> 73 #else 74 #include <bits/atomicity.h> 75 #endif 76 #endif 77 78 namespace WTF { 79 80 #if OS(WINDOWS) 81 #define WTF_USE_LOCKFREE_THREADSAFEREFCOUNTED 1 82 83 #if COMPILER(MINGW) || COMPILER(MSVC7_OR_LOWER) || OS(WINCE) 84 inline int atomicIncrement(int* addend) { return InterlockedIncrement(reinterpret_cast<long*>(addend)); } 85 inline int atomicDecrement(int* addend) { return InterlockedDecrement(reinterpret_cast<long*>(addend)); } 86 #else 87 inline int atomicIncrement(int volatile* addend) { return InterlockedIncrement(reinterpret_cast<long volatile*>(addend)); } 88 inline int atomicDecrement(int volatile* addend) { return InterlockedDecrement(reinterpret_cast<long volatile*>(addend)); } 89 #endif 90 91 #elif OS(DARWIN) 92 #define WTF_USE_LOCKFREE_THREADSAFEREFCOUNTED 1 93 94 inline int atomicIncrement(int volatile* addend) { return OSAtomicIncrement32Barrier(const_cast<int*>(addend)); } 95 inline int atomicDecrement(int volatile* addend) { return OSAtomicDecrement32Barrier(const_cast<int*>(addend)); } 96 97 #elif OS(ANDROID) 98 99 inline int atomicIncrement(int volatile* addend) { return android_atomic_inc(addend); } 100 inline int atomicDecrement(int volatile* addend) { return android_atomic_dec(addend); } 101 102 #elif COMPILER(GCC) && !CPU(SPARC64) && !OS(SYMBIAN) // sizeof(_Atomic_word) != sizeof(int) on sparc64 gcc 103 #define WTF_USE_LOCKFREE_THREADSAFEREFCOUNTED 1 104 105 inline int atomicIncrement(int volatile* addend) { return __gnu_cxx::__exchange_and_add(addend, 1) + 1; } 106 inline int atomicDecrement(int volatile* addend) { return __gnu_cxx::__exchange_and_add(addend, -1) - 1; } 107 108 #endif 109 110 } // namespace WTF 111 112 #if USE(LOCKFREE_THREADSAFEREFCOUNTED) 113 using WTF::atomicDecrement; 114 using WTF::atomicIncrement; 115 #endif 116 117 #endif // Atomics_h 118
