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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 #pragma once | 9 #pragma once |
10 | 10 |
11 #include "base/base_api.h" | 11 #include "base/base_export.h" |
12 | 12 |
13 // This struct is not part of the public API of this module; clients may not | 13 // This struct is not part of the public API of this module; clients may not |
14 // use it. (However, it's exported via BASE_API because clients implicitly | 14 // use it. (However, it's exported via BASE_EXPORT because clients implicitly |
15 // do use it at link time by inlining these functions.) | 15 // do use it at link time by inlining these functions.) |
16 // Features of this x86. Values may not be correct before main() is run, | 16 // Features of this x86. Values may not be correct before main() is run, |
17 // but are set conservatively. | 17 // but are set conservatively. |
18 struct AtomicOps_x86CPUFeatureStruct { | 18 struct AtomicOps_x86CPUFeatureStruct { |
19 bool has_amd_lock_mb_bug; // Processor has AMD memory-barrier bug; do lfence | 19 bool has_amd_lock_mb_bug; // Processor has AMD memory-barrier bug; do lfence |
20 // after acquire compare-and-swap. | 20 // after acquire compare-and-swap. |
21 bool has_sse2; // Processor has SSE2. | 21 bool has_sse2; // Processor has SSE2. |
22 }; | 22 }; |
23 BASE_API extern struct AtomicOps_x86CPUFeatureStruct | 23 BASE_EXPORT extern struct AtomicOps_x86CPUFeatureStruct |
24 AtomicOps_Internalx86CPUFeatures; | 24 AtomicOps_Internalx86CPUFeatures; |
25 | 25 |
26 #define ATOMICOPS_COMPILER_BARRIER() __asm__ __volatile__("" : : : "memory") | 26 #define ATOMICOPS_COMPILER_BARRIER() __asm__ __volatile__("" : : : "memory") |
27 | 27 |
28 namespace base { | 28 namespace base { |
29 namespace subtle { | 29 namespace subtle { |
30 | 30 |
31 // 32-bit low-level operations on any platform. | 31 // 32-bit low-level operations on any platform. |
32 | 32 |
33 inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr, | 33 inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr, |
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261 } | 261 } |
262 | 262 |
263 #endif // defined(__x86_64__) | 263 #endif // defined(__x86_64__) |
264 | 264 |
265 } // namespace base::subtle | 265 } // namespace base::subtle |
266 } // namespace base | 266 } // namespace base |
267 | 267 |
268 #undef ATOMICOPS_COMPILER_BARRIER | 268 #undef ATOMICOPS_COMPILER_BARRIER |
269 | 269 |
270 #endif // BASE_ATOMICOPS_INTERNALS_X86_GCC_H_ | 270 #endif // BASE_ATOMICOPS_INTERNALS_X86_GCC_H_ |
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