1// Protocol Buffers - Google's data interchange format 2// Copyright 2012 Google Inc. All rights reserved. 3// http://code.google.com/p/protobuf/ 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 43namespace google { 44namespace protobuf { 45namespace internal { 46 47inline void MemoryBarrier() { 48 // We use MemoryBarrier from WinNT.h 49 ::MemoryBarrier(); 50} 51 52Atomic32 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 62Atomic32 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 70Atomic32 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 81Atomic64 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 90Atomic64 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 98Atomic64 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