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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 // For atomic operations on reference counts, see atomic_refcount.h. | 5 // For atomic operations on reference counts, see atomic_refcount.h. |
6 // For atomic operations on sequence numbers, see atomic_sequence_num.h. | 6 // For atomic operations on sequence numbers, see atomic_sequence_num.h. |
7 | 7 |
8 // The routines exported by this module are subtle. If you use them, even if | 8 // The routines exported by this module are subtle. If you use them, even if |
9 // you get the code right, it will depend on careful reasoning about atomicity | 9 // you get the code right, it will depend on careful reasoning about atomicity |
10 // and memory ordering; it will be less readable, and harder to maintain. If | 10 // and memory ordering; it will be less readable, and harder to maintain. If |
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24 // Although there are currently no compiler enforcement, you are encouraged | 24 // Although there are currently no compiler enforcement, you are encouraged |
25 // to use these. | 25 // to use these. |
26 // | 26 // |
27 | 27 |
28 #ifndef BASE_ATOMICOPS_H_ | 28 #ifndef BASE_ATOMICOPS_H_ |
29 #define BASE_ATOMICOPS_H_ | 29 #define BASE_ATOMICOPS_H_ |
30 | 30 |
31 #include "base/basictypes.h" | 31 #include "base/basictypes.h" |
32 #include "build/build_config.h" | 32 #include "build/build_config.h" |
33 | 33 |
| 34 #if defined(OS_WIN) && defined(ARCH_CPU_64_BITS) |
| 35 // windows.h #defines this (only on x64). This causes problems because the |
| 36 // public API also uses MemoryBarrier at the public name for this fence. So, on |
| 37 // X64, undef it, and call its documented |
| 38 // (http://msdn.microsoft.com/en-us/library/windows/desktop/ms684208.aspx) |
| 39 // implementation directly. |
| 40 #undef MemoryBarrier |
| 41 #endif |
| 42 |
34 namespace base { | 43 namespace base { |
35 namespace subtle { | 44 namespace subtle { |
36 | 45 |
37 typedef int32 Atomic32; | 46 typedef int32 Atomic32; |
38 #ifdef ARCH_CPU_64_BITS | 47 #ifdef ARCH_CPU_64_BITS |
39 // We need to be able to go between Atomic64 and AtomicWord implicitly. This | 48 // We need to be able to go between Atomic64 and AtomicWord implicitly. This |
40 // means Atomic64 and AtomicWord should be the same type on 64-bit. | 49 // means Atomic64 and AtomicWord should be the same type on 64-bit. |
41 #if defined(OS_NACL) | 50 #if defined(OS_NACL) |
42 // NaCl's intptr_t is not actually 64-bits on 64-bit! | 51 // NaCl's intptr_t is not actually 64-bits on 64-bit! |
43 // http://code.google.com/p/nativeclient/issues/detail?id=1162 | 52 // http://code.google.com/p/nativeclient/issues/detail?id=1162 |
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145 #error "Atomic operations are not supported on your platform" | 154 #error "Atomic operations are not supported on your platform" |
146 #endif | 155 #endif |
147 | 156 |
148 // On some platforms we need additional declarations to make | 157 // On some platforms we need additional declarations to make |
149 // AtomicWord compatible with our other Atomic* types. | 158 // AtomicWord compatible with our other Atomic* types. |
150 #if defined(OS_MACOSX) || defined(OS_OPENBSD) | 159 #if defined(OS_MACOSX) || defined(OS_OPENBSD) |
151 #include "base/atomicops_internals_atomicword_compat.h" | 160 #include "base/atomicops_internals_atomicword_compat.h" |
152 #endif | 161 #endif |
153 | 162 |
154 #endif // BASE_ATOMICOPS_H_ | 163 #endif // BASE_ATOMICOPS_H_ |
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