1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Copyright (C) 2016 Olivier Goffart <ogoffart@woboq.com>
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 QREADWRITELOCK_P_H
42#define QREADWRITELOCK_P_H
43
44//
45// W A R N I N G
46// -------------
47//
48// This file is not part of the Qt API. It exists for the convenience
49// of the implementation. This header file may change from version to
50// version without notice, or even be removed.
51//
52// We mean it.
53//
54
55#include <QtCore/private/qglobal_p.h>
56#include <QtCore/qhash.h>
57#include <QtCore/qwaitcondition.h>
58
59QT_REQUIRE_CONFIG(thread);
60
61QT_BEGIN_NAMESPACE
62
63class QReadWriteLockPrivate
64{
65public:
66 explicit QReadWriteLockPrivate(bool isRecursive = false)
67 : recursive(isRecursive) {}
68
69 QMutex mutex;
70 QWaitCondition writerCond;
71 QWaitCondition readerCond;
72 int readerCount = 0;
73 int writerCount = 0;
74 int waitingReaders = 0;
75 int waitingWriters = 0;
76 const bool recursive;
77
78 //Called with the mutex locked
79 bool lockForWrite(int timeout);
80 bool lockForRead(int timeout);
81 void unlock();
82
83 //memory management
84 int id = 0;
85 void release();
86 static QReadWriteLockPrivate *allocate();
87
88 // Recusive mutex handling
89 Qt::HANDLE currentWriter = {};
90 QHash<Qt::HANDLE, int> currentReaders;
91
92 // called with the mutex unlocked
93 bool recursiveLockForWrite(int timeout);
94 bool recursiveLockForRead(int timeout);
95 void recursiveUnlock();
96};
97
98QT_END_NAMESPACE
99
100#endif // QREADWRITELOCK_P_H
101

source code of qtbase/src/corelib/thread/qreadwritelock_p.h