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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 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 // This file is an internal atomic implementation, use base/atomicops.h instead. | 5 // This file is an internal atomic implementation, use base/atomicops.h instead. |
6 | 6 |
7 #ifndef BASE_ATOMICOPS_INTERNALS_X86_GCC_H_ | 7 #ifndef BASE_ATOMICOPS_INTERNALS_X86_GCC_H_ |
8 #define BASE_ATOMICOPS_INTERNALS_X86_GCC_H_ | 8 #define BASE_ATOMICOPS_INTERNALS_X86_GCC_H_ |
9 | 9 |
10 #include "base/base_export.h" | |
11 | |
12 // This struct is not part of the public API of this module; clients may not | |
13 // use it. (However, it's exported via BASE_EXPORT because clients implicitly | |
14 // do use it at link time by inlining these functions.) | |
15 // Features of this x86. Values may not be correct before main() is run, | |
16 // but are set conservatively. | |
17 struct AtomicOps_x86CPUFeatureStruct { | |
18 bool has_amd_lock_mb_bug; // Processor has AMD memory-barrier bug; do lfence | |
19 // after acquire compare-and-swap. | |
20 }; | |
21 BASE_EXPORT extern struct AtomicOps_x86CPUFeatureStruct | |
22 AtomicOps_Internalx86CPUFeatures; | |
23 | |
24 #define ATOMICOPS_COMPILER_BARRIER() __asm__ __volatile__("" : : : "memory") | 10 #define ATOMICOPS_COMPILER_BARRIER() __asm__ __volatile__("" : : : "memory") |
25 | 11 |
26 namespace base { | 12 namespace base { |
27 namespace subtle { | 13 namespace subtle { |
28 | 14 |
29 // 32-bit low-level operations on any platform. | 15 // 32-bit low-level operations on any platform. |
30 | 16 |
31 inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr, | 17 inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr, |
32 Atomic32 old_value, | 18 Atomic32 old_value, |
33 Atomic32 new_value) { | 19 Atomic32 new_value) { |
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233 } | 219 } |
234 | 220 |
235 #endif // defined(__x86_64__) | 221 #endif // defined(__x86_64__) |
236 | 222 |
237 } // namespace base::subtle | 223 } // namespace base::subtle |
238 } // namespace base | 224 } // namespace base |
239 | 225 |
240 #undef ATOMICOPS_COMPILER_BARRIER | 226 #undef ATOMICOPS_COMPILER_BARRIER |
241 | 227 |
242 #endif // BASE_ATOMICOPS_INTERNALS_X86_GCC_H_ | 228 #endif // BASE_ATOMICOPS_INTERNALS_X86_GCC_H_ |
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