1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Copyright (C) 2011 Thiago Macieira <thiago@kde.org>
5** Contact: https://www.qt.io/licensing/
6**
7** This file is part of the QtCore module of the Qt Toolkit.
8**
9** $QT_BEGIN_LICENSE:LGPL$
10** Commercial License Usage
11** Licensees holding valid commercial Qt licenses may use this file in
12** accordance with the commercial license agreement provided with the
13** Software or, alternatively, in accordance with the terms contained in
14** a written agreement between you and The Qt Company. For licensing terms
15** and conditions see https://www.qt.io/terms-conditions. For further
16** information use the contact form at https://www.qt.io/contact-us.
17**
18** GNU Lesser General Public License Usage
19** Alternatively, this file may be used under the terms of the GNU Lesser
20** General Public License version 3 as published by the Free Software
21** Foundation and appearing in the file LICENSE.LGPL3 included in the
22** packaging of this file. Please review the following information to
23** ensure the GNU Lesser General Public License version 3 requirements
24** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
25**
26** GNU General Public License Usage
27** Alternatively, this file may be used under the terms of the GNU
28** General Public License version 2.0 or (at your option) the GNU General
29** Public license version 3 or any later version approved by the KDE Free
30** Qt Foundation. The licenses are as published by the Free Software
31** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
32** included in the packaging of this file. Please review the following
33** information to ensure the GNU General Public License requirements will
34** be met: https://www.gnu.org/licenses/gpl-2.0.html and
35** https://www.gnu.org/licenses/gpl-3.0.html.
36**
37** $QT_END_LICENSE$
38**
39****************************************************************************/
40
41#ifndef QATOMIC_BOOTSTRAP_H
42#define QATOMIC_BOOTSTRAP_H
43
44#include <QtCore/qgenericatomic.h>
45
46QT_BEGIN_NAMESPACE
47
48#if 0
49// silence syncqt warnings
50QT_END_NAMESPACE
51#pragma qt_sync_skip_header_check
52#pragma qt_sync_stop_processing
53#endif
54
55template <typename T> struct QAtomicOps: QGenericAtomicOps<QAtomicOps<T> >
56{
57 typedef T Type;
58
59 static bool ref(T &_q_value) noexcept
60 {
61 return ++_q_value != 0;
62 }
63 static bool deref(T &_q_value) noexcept
64 {
65 return --_q_value != 0;
66 }
67
68 static bool testAndSetRelaxed(T &_q_value, T expectedValue, T newValue, T *currentValue = nullptr) noexcept
69 {
70 if (currentValue)
71 *currentValue = _q_value;
72 if (_q_value == expectedValue) {
73 _q_value = newValue;
74 return true;
75 }
76 return false;
77 }
78
79 static T fetchAndStoreRelaxed(T &_q_value, T newValue) noexcept
80 {
81 T tmp = _q_value;
82 _q_value = newValue;
83 return tmp;
84 }
85
86 template <typename AdditiveType> static
87 T fetchAndAddRelaxed(T &_q_value, AdditiveType valueToAdd) noexcept
88 {
89 T returnValue = _q_value;
90 _q_value += valueToAdd;
91 return returnValue;
92 }
93};
94
95QT_END_NAMESPACE
96
97#endif // QATOMIC_BOOTSTRAP_H
98