1 /**************************************************************************** 2 ** 3 ** Copyright (C) 2015 The Qt Company Ltd. 4 ** Contact: http://www.qt.io/licensing/ 5 ** 6 ** This file is part of the QtGui module of the Qt Toolkit. 7 ** 8 ** $QT_BEGIN_LICENSE:LGPL$ 9 ** Commercial License Usage 10 ** Licensees holding valid commercial Qt licenses may use this file in 11 ** accordance with the commercial license agreement provided with the 12 ** Software or, alternatively, in accordance with the terms contained in 13 ** a written agreement between you and The Qt Company. For licensing terms 14 ** and conditions see http://www.qt.io/terms-conditions. For further 15 ** information use the contact form at http://www.qt.io/contact-us. 16 ** 17 ** GNU Lesser General Public License Usage 18 ** Alternatively, this file may be used under the terms of the GNU Lesser 19 ** General Public License version 2.1 or version 3 as published by the Free 20 ** Software Foundation and appearing in the file LICENSE.LGPLv21 and 21 ** LICENSE.LGPLv3 included in the packaging of this file. Please review the 22 ** following information to ensure the GNU Lesser General Public License 23 ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and 24 ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. 25 ** 26 ** As a special exception, The Qt Company gives you certain additional 27 ** rights. These rights are described in The Qt Company LGPL Exception 28 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. 29 ** 30 ** GNU General Public License Usage 31 ** Alternatively, this file may be used under the terms of the GNU 32 ** General Public License version 3.0 as published by the Free Software 33 ** Foundation and appearing in the file LICENSE.GPL included in the 34 ** packaging of this file. Please review the following information to 35 ** ensure the GNU General Public License version 3.0 requirements will be 36 ** met: http://www.gnu.org/copyleft/gpl.html. 37 ** 38 ** $QT_END_LICENSE$ 39 ** 40 ****************************************************************************/ 41 42 #ifndef QLOCK_P_H 43 #define QLOCK_P_H 44 45 // 46 // W A R N I N G 47 // ------------- 48 // 49 // This file is not part of the Qt API. This header file may 50 // change from version to version without notice, or even be 51 // removed. 52 // 53 // We mean it. 54 // 55 56 #include "QtCore/qstring.h" 57 58 QT_BEGIN_NAMESPACE 59 60 class QLockData; 61 62 class Q_GUI_EXPORT QLock 63 { 64 public: 65 QLock(const QString &filename, char id, bool create = false); 66 ~QLock(); 67 68 enum Type { Read, Write }; 69 70 bool isValid() const; 71 void lock(Type type); 72 void unlock(); 73 bool locked() const; 74 75 private: 76 Type type; 77 QLockData *data; 78 }; 79 80 81 // Nice class for ensuring the lock is released. 82 // Just create one on the stack and the lock is automatically released 83 // when QLockHandle is destructed. 84 class Q_GUI_EXPORT QLockHandle 85 { 86 public: QLockHandle(QLock * l,QLock::Type type)87 QLockHandle(QLock *l, QLock::Type type) : qlock(l) { qlock->lock(type); } ~QLockHandle()88 ~QLockHandle() { if (locked()) qlock->unlock(); } 89 lock(QLock::Type type)90 void lock(QLock::Type type) { qlock->lock(type); } unlock()91 void unlock() { qlock->unlock(); } locked()92 bool locked() const { return qlock->locked(); } 93 94 private: 95 QLock *qlock; 96 }; 97 98 QT_END_NAMESPACE 99 100 #endif // QLOCK_P_H 101