summaryrefslogtreecommitdiff
path: root/src/corelib/kernel/qsystemsemaphore.h
blob: c9e56ccf6e2b8046a9c64fd428086a22da488ab0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QSYSTEMSEMAPHORE_H
#define QSYSTEMSEMAPHORE_H

#include <QtCore/qstring.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Core)

#ifndef QT_NO_SYSTEMSEMAPHORE

class QSystemSemaphorePrivate;

class Q_CORE_EXPORT QSystemSemaphore
{

public:
    enum AccessMode
    {
        Open,
        Create
    };

    enum SystemSemaphoreError
    {
        NoError,
        PermissionDenied,
        KeyError,
        AlreadyExists,
        NotFound,
        OutOfResources,
        UnknownError
    };

    QSystemSemaphore(const QString &key, int initialValue = 0, AccessMode mode = Open);
    ~QSystemSemaphore();

    void setKey(const QString &key, int initialValue = 0, AccessMode mode = Open);
    QString key() const;

    bool acquire();
    bool release(int n = 1);

    SystemSemaphoreError error() const;
    QString errorString() const;

private:
    Q_DISABLE_COPY(QSystemSemaphore)
    QSystemSemaphorePrivate *d;
};

#endif // QT_NO_SYSTEMSEMAPHORE

QT_END_NAMESPACE

QT_END_HEADER

#endif // QSYSTEMSEMAPHORE_H