1/* 2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11#include "webrtc/system_wrappers/interface/atomic32.h" 12 13#include <assert.h> 14#include <libkern/OSAtomic.h> 15#include <stdlib.h> 16 17#include "webrtc/common_types.h" 18 19namespace webrtc { 20 21Atomic32::Atomic32(int32_t initial_value) 22 : value_(initial_value) { 23 assert(Is32bitAligned()); 24} 25 26Atomic32::~Atomic32() { 27} 28 29int32_t Atomic32::operator++() { 30 return OSAtomicIncrement32Barrier(&value_); 31} 32 33int32_t Atomic32::operator--() { 34 return OSAtomicDecrement32Barrier(&value_); 35} 36 37int32_t Atomic32::operator+=(int32_t value) { 38 return OSAtomicAdd32Barrier(value, &value_); 39} 40 41int32_t Atomic32::operator-=(int32_t value) { 42 return OSAtomicAdd32Barrier(-value, &value_); 43} 44 45bool Atomic32::CompareExchange(int32_t new_value, int32_t compare_value) { 46 return OSAtomicCompareAndSwap32Barrier(compare_value, new_value, &value_); 47} 48 49} // namespace webrtc 50