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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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21 // versions are provided when no barriers are needed: | 21 // versions are provided when no barriers are needed: |
22 // NoBarrier_Store() | 22 // NoBarrier_Store() |
23 // NoBarrier_Load() | 23 // NoBarrier_Load() |
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 <stdint.h> |
| 32 |
32 #include "build/build_config.h" | 33 #include "build/build_config.h" |
33 | 34 |
34 #if defined(OS_WIN) && defined(ARCH_CPU_64_BITS) | 35 #if defined(OS_WIN) && defined(ARCH_CPU_64_BITS) |
35 // windows.h #defines this (only on x64). This causes problems because the | 36 // 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 // public API also uses MemoryBarrier at the public name for this fence. So, on |
37 // X64, undef it, and call its documented | 38 // X64, undef it, and call its documented |
38 // (http://msdn.microsoft.com/en-us/library/windows/desktop/ms684208.aspx) | 39 // (http://msdn.microsoft.com/en-us/library/windows/desktop/ms684208.aspx) |
39 // implementation directly. | 40 // implementation directly. |
40 #undef MemoryBarrier | 41 #undef MemoryBarrier |
41 #endif | 42 #endif |
42 | 43 |
43 namespace base { | 44 namespace base { |
44 namespace subtle { | 45 namespace subtle { |
45 | 46 |
46 typedef int32 Atomic32; | 47 typedef int32_t Atomic32; |
47 #ifdef ARCH_CPU_64_BITS | 48 #ifdef ARCH_CPU_64_BITS |
48 // We need to be able to go between Atomic64 and AtomicWord implicitly. This | 49 // We need to be able to go between Atomic64 and AtomicWord implicitly. This |
49 // means Atomic64 and AtomicWord should be the same type on 64-bit. | 50 // means Atomic64 and AtomicWord should be the same type on 64-bit. |
50 #if defined(__ILP32__) || defined(OS_NACL) | 51 #if defined(__ILP32__) || defined(OS_NACL) |
51 // NaCl's intptr_t is not actually 64-bits on 64-bit! | 52 // NaCl's intptr_t is not actually 64-bits on 64-bit! |
52 // http://code.google.com/p/nativeclient/issues/detail?id=1162 | 53 // http://code.google.com/p/nativeclient/issues/detail?id=1162 |
53 typedef int64_t Atomic64; | 54 typedef int64_t Atomic64; |
54 #else | 55 #else |
55 typedef intptr_t Atomic64; | 56 typedef intptr_t Atomic64; |
56 #endif | 57 #endif |
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155 #error "Atomic operations are not supported on your platform" | 156 #error "Atomic operations are not supported on your platform" |
156 #endif | 157 #endif |
157 | 158 |
158 // On some platforms we need additional declarations to make | 159 // On some platforms we need additional declarations to make |
159 // AtomicWord compatible with our other Atomic* types. | 160 // AtomicWord compatible with our other Atomic* types. |
160 #if defined(OS_MACOSX) || defined(OS_OPENBSD) | 161 #if defined(OS_MACOSX) || defined(OS_OPENBSD) |
161 #include "base/atomicops_internals_atomicword_compat.h" | 162 #include "base/atomicops_internals_atomicword_compat.h" |
162 #endif | 163 #endif |
163 | 164 |
164 #endif // BASE_ATOMICOPS_H_ | 165 #endif // BASE_ATOMICOPS_H_ |
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