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62 lines
1.8 KiB
C++
62 lines
1.8 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 "webrtc/system_wrappers/interface/atomic32.h"
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#include <assert.h>
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#include <windows.h>
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#include "webrtc/common_types.h"
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#include "webrtc/system_wrappers/interface/compile_assert.h"
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namespace webrtc {
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Atomic32::Atomic32(int32_t initial_value)
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: value_(initial_value) {
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COMPILE_ASSERT(sizeof(value_) == sizeof(LONG),
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counter_variable_is_the_expected_size);
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assert(Is32bitAligned());
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}
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Atomic32::~Atomic32() {
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}
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int32_t Atomic32::operator++() {
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return static_cast<int32_t>(InterlockedIncrement(
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reinterpret_cast<volatile LONG*>(&value_)));
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}
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int32_t Atomic32::operator--() {
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return static_cast<int32_t>(InterlockedDecrement(
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reinterpret_cast<volatile LONG*>(&value_)));
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}
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int32_t Atomic32::operator+=(int32_t 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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int32_t Atomic32::operator-=(int32_t 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(int32_t new_value, int32_t 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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} // namespace webrtc
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