1 /*
2 * Copyright (C) 2007, 2008, 2010, 2012 Apple Inc. All rights reserved.
3 * Copyright (C) 2007 Justin Haygood (jhaygood@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
atomicIncrement(int volatile * addend)45 ALWAYS_INLINE int atomicIncrement(int volatile* addend) { return InterlockedIncrement(reinterpret_cast<long volatile*>(addend)); }
atomicDecrement(int volatile * addend)46 ALWAYS_INLINE int atomicDecrement(int volatile* addend) { return InterlockedDecrement(reinterpret_cast<long volatile*>(addend)); }
47
atomicIncrement(int64_t volatile * addend)48 ALWAYS_INLINE int64_t atomicIncrement(int64_t volatile* addend) { return InterlockedIncrement64(reinterpret_cast<long long volatile*>(addend)); }
atomicDecrement(int64_t volatile * addend)49 ALWAYS_INLINE int64_t atomicDecrement(int64_t volatile* addend) { return InterlockedDecrement64(reinterpret_cast<long long volatile*>(addend)); }
50
atomicTestAndSetToOne(int volatile * ptr)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
atomicSetOneToZero(int volatile * ptr)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