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 "atomic32.h"
12
13#include <assert.h>
14#include <libkern/OSAtomic.h>
15#include <stdlib.h>
16
17#include "common_types.h"
18
19namespace webrtc {
20
21Atomic32::Atomic32(WebRtc_Word32 initialValue) : _value(initialValue)
22{
23    assert(Is32bitAligned());
24}
25
26Atomic32::~Atomic32()
27{
28}
29
30WebRtc_Word32 Atomic32::operator++()
31{
32    return OSAtomicIncrement32Barrier(&_value);
33}
34
35WebRtc_Word32 Atomic32::operator--()
36{
37    return OSAtomicDecrement32Barrier(&_value);
38}
39
40WebRtc_Word32 Atomic32::operator+=(WebRtc_Word32 value)
41{
42    return OSAtomicAdd32Barrier(value, &_value);
43}
44
45WebRtc_Word32 Atomic32::operator-=(WebRtc_Word32 value)
46{
47    return OSAtomicAdd32Barrier(-value, &_value);
48}
49
50bool Atomic32::CompareExchange(WebRtc_Word32 newValue,
51                               WebRtc_Word32 compareValue)
52{
53    return OSAtomicCompareAndSwap32Barrier(compareValue, newValue, &_value);
54}
55
56WebRtc_Word32 Atomic32::Value() const
57{
58    return _value;
59}
60}  // namespace webrtc
61