9cb9fc17b1
BUG= Review URL: https://webrtc-codereview.appspot.com/937016 git-svn-id: http://webrtc.googlecode.com/svn/trunk@3067 4adac7df-926f-26a2-2b94-8c16560cd09d
68 lines
1.9 KiB
C++
68 lines
1.9 KiB
C++
/*
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* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "atomic32.h"
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#include <assert.h>
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#include <windows.h>
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#include "common_types.h"
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#include "compile_assert.h"
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namespace webrtc {
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Atomic32::Atomic32(WebRtc_Word32 initial_value)
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: value_(initial_value) {
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// Make sure that the counter variable we're using is of the same size
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// as what the API expects.
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COMPILE_ASSERT(sizeof(value_) == sizeof(LONG));
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assert(Is32bitAligned());
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}
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Atomic32::~Atomic32() {
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}
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WebRtc_Word32 Atomic32::operator++() {
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return static_cast<WebRtc_Word32>(InterlockedIncrement(
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reinterpret_cast<volatile LONG*>(&value_)));
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}
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WebRtc_Word32 Atomic32::operator--() {
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return static_cast<WebRtc_Word32>(InterlockedDecrement(
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reinterpret_cast<volatile LONG*>(&value_)));
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}
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WebRtc_Word32 Atomic32::operator+=(WebRtc_Word32 value) {
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return InterlockedExchangeAdd(reinterpret_cast<volatile LONG*>(&value_),
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value);
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}
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WebRtc_Word32 Atomic32::operator-=(WebRtc_Word32 value) {
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return InterlockedExchangeAdd(reinterpret_cast<volatile LONG*>(&value_),
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-value);
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}
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bool Atomic32::CompareExchange(WebRtc_Word32 new_value,
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WebRtc_Word32 compare_value) {
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const LONG old_value = InterlockedCompareExchange(
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reinterpret_cast<volatile LONG*>(&value_),
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new_value,
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compare_value);
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// If the old value and the compare value is the same an exchange happened.
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return (old_value == compare_value);
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}
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WebRtc_Word32 Atomic32::Value() const {
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return value_;
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}
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} // namespace webrtc
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