blob: cd4ce0858018bc8a2ae7db136d27221141862bad [file] [log] [blame]
* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
#include "webrtc/system_wrappers/include/atomic32.h"
#include <assert.h>
#include <windows.h>
#include "webrtc/common_types.h"
namespace webrtc {
Atomic32::Atomic32(int32_t initial_value)
: value_(initial_value) {
static_assert(sizeof(value_) == sizeof(LONG),
"counter variable is the expected size");
Atomic32::~Atomic32() {
int32_t Atomic32::operator++() {
return static_cast<int32_t>(InterlockedIncrement(
reinterpret_cast<volatile LONG*>(&value_)));
int32_t Atomic32::operator--() {
return static_cast<int32_t>(InterlockedDecrement(
reinterpret_cast<volatile LONG*>(&value_)));
int32_t Atomic32::operator+=(int32_t value) {
return InterlockedExchangeAdd(reinterpret_cast<volatile LONG*>(&value_),
int32_t Atomic32::operator-=(int32_t value) {
return InterlockedExchangeAdd(reinterpret_cast<volatile LONG*>(&value_),
bool Atomic32::CompareExchange(int32_t new_value, int32_t compare_value) {
const LONG old_value = InterlockedCompareExchange(
reinterpret_cast<volatile LONG*>(&value_),
// If the old value and the compare value is the same an exchange happened.
return (old_value == compare_value);
} // namespace webrtc