2019-07-27 22:44:32 +08:00
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// Protocol Buffers - Google's data interchange format
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2015-02-04 22:26:20 +08:00
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// Copyright 2012 Google Inc. All rights reserved.
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// http://code.google.com/p/protobuf/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// This file is an internal atomic implementation, use atomicops.h instead.
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#ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_X86_MSVC_H_
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#define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_X86_MSVC_H_
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namespace google {
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namespace protobuf {
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namespace internal {
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inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
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Atomic32 increment) {
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return Barrier_AtomicIncrement(ptr, increment);
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}
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#if !(defined(_MSC_VER) && _MSC_VER >= 1400)
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#error "We require at least vs2005 for MemoryBarrier"
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#endif
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inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
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Atomic32 old_value,
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Atomic32 new_value) {
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return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
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}
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inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
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Atomic32 old_value,
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Atomic32 new_value) {
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return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
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}
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inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
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*ptr = value;
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}
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inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) {
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NoBarrier_AtomicExchange(ptr, value);
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// acts as a barrier in this implementation
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}
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inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
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*ptr = value; // works w/o barrier for current Intel chips as of June 2005
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// See comments in Atomic64 version of Release_Store() below.
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}
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inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
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return *ptr;
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}
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inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
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Atomic32 value = *ptr;
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return value;
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}
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inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
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MemoryBarrier();
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return *ptr;
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}
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#if defined(_WIN64)
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// 64-bit low-level operations on 64-bit platform.
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inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr,
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Atomic64 increment) {
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return Barrier_AtomicIncrement(ptr, increment);
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}
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inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) {
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*ptr = value;
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}
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inline void Acquire_Store(volatile Atomic64* ptr, Atomic64 value) {
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NoBarrier_AtomicExchange(ptr, value);
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// acts as a barrier in this implementation
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}
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inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) {
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*ptr = value; // works w/o barrier for current Intel chips as of June 2005
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// When new chips come out, check:
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// IA-32 Intel Architecture Software Developer's Manual, Volume 3:
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// System Programming Guide, Chatper 7: Multiple-processor management,
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// Section 7.2, Memory Ordering.
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// Last seen at:
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// http://developer.intel.com/design/pentium4/manuals/index_new.htm
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}
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inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) {
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return *ptr;
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}
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inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) {
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Atomic64 value = *ptr;
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return value;
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}
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inline Atomic64 Release_Load(volatile const Atomic64* ptr) {
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MemoryBarrier();
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return *ptr;
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}
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inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
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Atomic64 old_value,
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Atomic64 new_value) {
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return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
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}
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inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
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Atomic64 old_value,
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Atomic64 new_value) {
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return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
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}
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#endif // defined(_WIN64)
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} // namespace internal
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} // namespace protobuf
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} // namespace google
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#endif // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_X86_MSVC_H_
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