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 QWSLOCK_P_H 43 #define QWSLOCK_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 <qglobal.h> 57 58 #ifndef QT_NO_QWS_MULTIPROCESS 59 60 #ifdef QT_POSIX_IPC 61 # include <semaphore.h> 62 #endif 63 64 QT_BEGIN_NAMESPACE 65 66 class QWSLock 67 { 68 public: 69 enum LockType { BackingStore, Communication, RegionEvent }; 70 71 QWSLock(int lockId = -1); 72 ~QWSLock(); 73 74 bool lock(LockType type, int timeout = -1); 75 void unlock(LockType type); 76 bool wait(LockType type, int timeout = -1); 77 bool hasLock(LockType type); id()78 int id() const { return semId; } 79 80 private: 81 bool up(unsigned short semNum); 82 bool down(unsigned short semNum, int timeout); 83 int getValue(unsigned short semNum) const; 84 85 int semId; 86 int lockCount[2]; 87 #ifdef QT_POSIX_IPC 88 sem_t *sems[3]; 89 bool owned; 90 #endif 91 }; 92 93 QT_END_NAMESPACE 94 95 #endif // QT_NO_QWS_MULTIPROCESS 96 97 #endif // QWSLOCK_P_H 98