1 // Protocol Buffers - Google's data interchange format
2 // Copyright 2012 Google Inc. All rights reserved.
3 // https://developers.google.com/protocol-buffers/
4 //
5 // Redistribution and use in source and binary forms, with or without
6 // modification, are permitted provided that the following conditions are
7 // met:
8 //
9 // * Redistributions of source code must retain the above copyright
10 // notice, this list of conditions and the following disclaimer.
11 // * Redistributions in binary form must reproduce the above
12 // copyright notice, this list of conditions and the following disclaimer
13 // in the documentation and/or other materials provided with the
14 // distribution.
15 // * Neither the name of Google Inc. nor the names of its
16 // contributors may be used to endorse or promote products derived from
17 // this software without specific prior written permission.
18 //
19 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30
31 // The compilation of extension_set.cc fails when windows.h is included.
32 // Therefore we move the code depending on windows.h to this separate cc file.
33
34 // Don't compile this file for people not concerned about thread safety.
35 #ifndef GOOGLE_PROTOBUF_NO_THREAD_SAFETY
36
37 #include <google/protobuf/stubs/atomicops.h>
38
39 #ifdef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_X86_MSVC_H_
40
41 #include <windows.h>
42
43 namespace google {
44 namespace protobuf {
45 namespace internal {
46
MemoryBarrier()47 inline void MemoryBarrier() {
48 // We use MemoryBarrier from WinNT.h
49 ::MemoryBarrier();
50 }
51
NoBarrier_CompareAndSwap(volatile Atomic32 * ptr,Atomic32 old_value,Atomic32 new_value)52 Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
53 Atomic32 old_value,
54 Atomic32 new_value) {
55 LONG result = InterlockedCompareExchange(
56 reinterpret_cast<volatile LONG*>(ptr),
57 static_cast<LONG>(new_value),
58 static_cast<LONG>(old_value));
59 return static_cast<Atomic32>(result);
60 }
61
NoBarrier_AtomicExchange(volatile Atomic32 * ptr,Atomic32 new_value)62 Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
63 Atomic32 new_value) {
64 LONG result = InterlockedExchange(
65 reinterpret_cast<volatile LONG*>(ptr),
66 static_cast<LONG>(new_value));
67 return static_cast<Atomic32>(result);
68 }
69
Barrier_AtomicIncrement(volatile Atomic32 * ptr,Atomic32 increment)70 Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
71 Atomic32 increment) {
72 return InterlockedExchangeAdd(
73 reinterpret_cast<volatile LONG*>(ptr),
74 static_cast<LONG>(increment)) + increment;
75 }
76
77 #if defined(_WIN64)
78
79 // 64-bit low-level operations on 64-bit platform.
80
NoBarrier_CompareAndSwap(volatile Atomic64 * ptr,Atomic64 old_value,Atomic64 new_value)81 Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
82 Atomic64 old_value,
83 Atomic64 new_value) {
84 PVOID result = InterlockedCompareExchangePointer(
85 reinterpret_cast<volatile PVOID*>(ptr),
86 reinterpret_cast<PVOID>(new_value), reinterpret_cast<PVOID>(old_value));
87 return reinterpret_cast<Atomic64>(result);
88 }
89
NoBarrier_AtomicExchange(volatile Atomic64 * ptr,Atomic64 new_value)90 Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr,
91 Atomic64 new_value) {
92 PVOID result = InterlockedExchangePointer(
93 reinterpret_cast<volatile PVOID*>(ptr),
94 reinterpret_cast<PVOID>(new_value));
95 return reinterpret_cast<Atomic64>(result);
96 }
97
Barrier_AtomicIncrement(volatile Atomic64 * ptr,Atomic64 increment)98 Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr,
99 Atomic64 increment) {
100 return InterlockedExchangeAdd64(
101 reinterpret_cast<volatile LONGLONG*>(ptr),
102 static_cast<LONGLONG>(increment)) + increment;
103 }
104
105 #endif // defined(_WIN64)
106
107 } // namespace internal
108 } // namespace protobuf
109 } // namespace google
110
111 #endif // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_X86_MSVC_H_
112 #endif // GOOGLE_PROTOBUF_NO_THREAD_SAFETY
113