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 
Atomic32(int32_t initial_value)21 Atomic32::Atomic32(int32_t initial_value)
22     : value_(initial_value) {
23   assert(Is32bitAligned());
24 }
25 
~Atomic32()26 Atomic32::~Atomic32() {
27 }
28 
operator ++()29 int32_t Atomic32::operator++() {
30   return OSAtomicIncrement32Barrier(&value_);
31 }
32 
operator --()33 int32_t Atomic32::operator--() {
34   return OSAtomicDecrement32Barrier(&value_);
35 }
36 
operator +=(int32_t value)37 int32_t Atomic32::operator+=(int32_t value) {
38   return OSAtomicAdd32Barrier(value, &value_);
39 }
40 
operator -=(int32_t value)41 int32_t Atomic32::operator-=(int32_t value) {
42   return OSAtomicAdd32Barrier(-value, &value_);
43 }
44 
CompareExchange(int32_t new_value,int32_t compare_value)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