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1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2006-2008 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_MSVC_H_ | 7 #ifndef BASE_ATOMICOPS_INTERNALS_X86_MSVC_H_ |
8 #define BASE_ATOMICOPS_INTERNALS_X86_MSVC_H_ | 8 #define BASE_ATOMICOPS_INTERNALS_X86_MSVC_H_ |
9 | 9 |
10 #include <windows.h> | 10 #include <windows.h> |
11 | 11 |
| 12 #if defined(ARCH_CPU_64_BITS) |
| 13 // windows.h #defines this (only on x64). This causes problems because the |
| 14 // public API also uses MemoryBarrier at the public name for this fence. So, on |
| 15 // X64, undef it, and call its documented |
| 16 // (http://msdn.microsoft.com/en-us/library/windows/desktop/ms684208.aspx) |
| 17 // implementation directly. |
| 18 #undef MemoryBarrier |
| 19 #endif |
| 20 |
12 namespace base { | 21 namespace base { |
13 namespace subtle { | 22 namespace subtle { |
14 | 23 |
15 inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr, | 24 inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr, |
16 Atomic32 old_value, | 25 Atomic32 old_value, |
17 Atomic32 new_value) { | 26 Atomic32 new_value) { |
18 LONG result = InterlockedCompareExchange( | 27 LONG result = InterlockedCompareExchange( |
19 reinterpret_cast<volatile LONG*>(ptr), | 28 reinterpret_cast<volatile LONG*>(ptr), |
20 static_cast<LONG>(new_value), | 29 static_cast<LONG>(new_value), |
21 static_cast<LONG>(old_value)); | 30 static_cast<LONG>(old_value)); |
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39 | 48 |
40 inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr, | 49 inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr, |
41 Atomic32 increment) { | 50 Atomic32 increment) { |
42 return Barrier_AtomicIncrement(ptr, increment); | 51 return Barrier_AtomicIncrement(ptr, increment); |
43 } | 52 } |
44 | 53 |
45 #if !(defined(_MSC_VER) && _MSC_VER >= 1400) | 54 #if !(defined(_MSC_VER) && _MSC_VER >= 1400) |
46 #error "We require at least vs2005 for MemoryBarrier" | 55 #error "We require at least vs2005 for MemoryBarrier" |
47 #endif | 56 #endif |
48 inline void MemoryBarrier() { | 57 inline void MemoryBarrier() { |
| 58 #if defined(ARCH_CPU_64_BITS) |
| 59 // See #undef and note at the top of this file. |
| 60 __faststorefence(); |
| 61 #else |
49 // We use MemoryBarrier from WinNT.h | 62 // We use MemoryBarrier from WinNT.h |
50 ::MemoryBarrier(); | 63 ::MemoryBarrier(); |
| 64 #endif |
51 } | 65 } |
52 | 66 |
53 inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr, | 67 inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr, |
54 Atomic32 old_value, | 68 Atomic32 old_value, |
55 Atomic32 new_value) { | 69 Atomic32 new_value) { |
56 return NoBarrier_CompareAndSwap(ptr, old_value, new_value); | 70 return NoBarrier_CompareAndSwap(ptr, old_value, new_value); |
57 } | 71 } |
58 | 72 |
59 inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr, | 73 inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr, |
60 Atomic32 old_value, | 74 Atomic32 old_value, |
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171 return NoBarrier_CompareAndSwap(ptr, old_value, new_value); | 185 return NoBarrier_CompareAndSwap(ptr, old_value, new_value); |
172 } | 186 } |
173 | 187 |
174 | 188 |
175 #endif // defined(_WIN64) | 189 #endif // defined(_WIN64) |
176 | 190 |
177 } // namespace base::subtle | 191 } // namespace base::subtle |
178 } // namespace base | 192 } // namespace base |
179 | 193 |
180 #endif // BASE_ATOMICOPS_INTERNALS_X86_MSVC_H_ | 194 #endif // BASE_ATOMICOPS_INTERNALS_X86_MSVC_H_ |
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