1 // Protocol Buffers - Google's data interchange format
2 // Copyright 2012 Google Inc.  All rights reserved.
3 // https://developers.google.com/protocol-buffers/
4 //
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7 // met:
8 //
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10 // notice, this list of conditions and the following disclaimer.
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14 // distribution.
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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