1 /* 2 * Copyright (C) 2007, 2008, 2010, 2012 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 #ifndef Atomics_h 31 #define Atomics_h 32 33 #include "wtf/CPU.h" 34 #include "wtf/Platform.h" 35 #include <stdint.h> 36 37 #if OS(WINDOWS) 38 #include <windows.h> 39 #elif OS(ANDROID) 40 #include <sys/atomics.h> 41 #endif 42 43 namespace WTF { 44 45 #if OS(WINDOWS) 46 47 ALWAYS_INLINE int atomicIncrement(int volatile* addend) { return InterlockedIncrement(reinterpret_cast<long volatile*>(addend)); } 48 ALWAYS_INLINE int atomicDecrement(int volatile* addend) { return InterlockedDecrement(reinterpret_cast<long volatile*>(addend)); } 49 50 ALWAYS_INLINE int64_t atomicIncrement(int64_t volatile* addend) { return InterlockedIncrement64(reinterpret_cast<long long volatile*>(addend)); } 51 ALWAYS_INLINE int64_t atomicDecrement(int64_t volatile* addend) { return InterlockedDecrement64(reinterpret_cast<long long volatile*>(addend)); } 52 53 #elif OS(ANDROID) 54 55 // Note, __atomic_{inc, dec}() return the previous value of addend's content. 56 ALWAYS_INLINE int atomicIncrement(int volatile* addend) { return __atomic_inc(addend) + 1; } 57 ALWAYS_INLINE int atomicDecrement(int volatile* addend) { return __atomic_dec(addend) - 1; } 58 59 #else 60 61 ALWAYS_INLINE int atomicIncrement(int volatile* addend) { return __sync_add_and_fetch(addend, 1); } 62 ALWAYS_INLINE int atomicDecrement(int volatile* addend) { return __sync_sub_and_fetch(addend, 1); } 63 64 ALWAYS_INLINE int64_t atomicIncrement(int64_t volatile* addend) { return __sync_add_and_fetch(addend, 1); } 65 ALWAYS_INLINE int64_t atomicDecrement(int64_t volatile* addend) { return __sync_sub_and_fetch(addend, 1); } 66 67 #endif 68 69 } // namespace WTF 70 71 using WTF::atomicDecrement; 72 using WTF::atomicIncrement; 73 74 #endif // Atomics_h 75
