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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 | |
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