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/include/atomic32.h" 12 13 #include <assert.h> 14 #include <libkern/OSAtomic.h> 15 #include <stdlib.h> 16 17 #include "webrtc/common_types.h" 18 19 namespace webrtc { 20 21 Atomic32::Atomic32(int32_t initial_value) 22 : value_(initial_value) { 23 assert(Is32bitAligned()); 24 } 25 26 Atomic32::~Atomic32() { 27 } 28 29 int32_t Atomic32::operator++() { 30 return OSAtomicIncrement32Barrier(&value_); 31 } 32 33 int32_t Atomic32::operator--() { 34 return OSAtomicDecrement32Barrier(&value_); 35 } 36 37 int32_t Atomic32::operator+=(int32_t value) { 38 return OSAtomicAdd32Barrier(value, &value_); 39 } 40 41 int32_t Atomic32::operator-=(int32_t value) { 42 return OSAtomicAdd32Barrier(-value, &value_); 43 } 44 45 bool Atomic32::CompareExchange(int32_t new_value, int32_t compare_value) { 46 return OSAtomicCompareAndSwap32Barrier(compare_value, new_value, &value_); 47 } 48 49 } // namespace webrtc 50
