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/Assertions.h" 34 35 #include <stdint.h> 36 37 #if COMPILER(MSVC) 38 #include <windows.h> 39 #endif 40 41 namespace WTF { 42 43 #if COMPILER(MSVC) 44 45 ALWAYS_INLINE int atomicIncrement(int volatile* addend) { return InterlockedIncrement(reinterpret_cast<long volatile*>(addend)); } 46 ALWAYS_INLINE int atomicDecrement(int volatile* addend) { return InterlockedDecrement(reinterpret_cast<long volatile*>(addend)); } 47 48 ALWAYS_INLINE int64_t atomicIncrement(int64_t volatile* addend) { return InterlockedIncrement64(reinterpret_cast<long long volatile*>(addend)); } 49 ALWAYS_INLINE int64_t atomicDecrement(int64_t volatile* addend) { return InterlockedDecrement64(reinterpret_cast<long long volatile*>(addend)); } 50 51 ALWAYS_INLINE int atomicTestAndSetToOne(int volatile* ptr) 52 { 53 int ret = InterlockedExchange(reinterpret_cast<long volatile*>(ptr), 1); 54 ASSERT(!ret || ret == 1); 55 return ret; 56 } 57 58 ALWAYS_INLINE void atomicSetOneToZero(int volatile* ptr) 59 { 60 ASSERT(*ptr == 1); 61 InterlockedExchange(reinterpret_cast<long volatile*>(ptr), 0); 62 } 63 64 #else 65 66 ALWAYS_INLINE int atomicIncrement(int volatile* addend) { return __sync_add_and_fetch(addend, 1); } 67 ALWAYS_INLINE int atomicDecrement(int volatile* addend) { return __sync_sub_and_fetch(addend, 1); } 68 69 ALWAYS_INLINE int64_t atomicIncrement(int64_t volatile* addend) { return __sync_add_and_fetch(addend, 1); } 70 ALWAYS_INLINE int64_t atomicDecrement(int64_t volatile* addend) { return __sync_sub_and_fetch(addend, 1); } 71 72 ALWAYS_INLINE int atomicTestAndSetToOne(int volatile* ptr) 73 { 74 int ret = __sync_lock_test_and_set(ptr, 1); 75 ASSERT(!ret || ret == 1); 76 return ret; 77 } 78 79 ALWAYS_INLINE void atomicSetOneToZero(int volatile* ptr) 80 { 81 ASSERT(*ptr == 1); 82 __sync_lock_release(ptr); 83 } 84 85 #endif 86 87 } // namespace WTF 88 89 using WTF::atomicDecrement; 90 using WTF::atomicIncrement; 91 using WTF::atomicTestAndSetToOne; 92 using WTF::atomicSetOneToZero; 93 94 #endif // Atomics_h 95
