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Member "cb2bib-2.0.1/src/qtsingleapplication/src/qtlockedfile.h" (12 Feb 2021, 3280 Bytes) of package /linux/privat/cb2bib-2.0.1.tar.gz:


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    1 /****************************************************************************
    2 **
    3 ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
    4 ** Contact: http://www.qt-project.org/legal
    5 **
    6 ** This file is part of the Qt Solutions component.
    7 **
    8 ** $QT_BEGIN_LICENSE:BSD$
    9 ** You may use this file under the terms of the BSD license as follows:
   10 **
   11 ** "Redistribution and use in source and binary forms, with or without
   12 ** modification, are permitted provided that the following conditions are
   13 ** met:
   14 **   * Redistributions of source code must retain the above copyright
   15 **     notice, this list of conditions and the following disclaimer.
   16 **   * Redistributions in binary form must reproduce the above copyright
   17 **     notice, this list of conditions and the following disclaimer in
   18 **     the documentation and/or other materials provided with the
   19 **     distribution.
   20 **   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
   21 **     of its contributors may be used to endorse or promote products derived
   22 **     from this software without specific prior written permission.
   23 **
   24 **
   25 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   26 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   27 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   28 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   29 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   30 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   31 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   32 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   33 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   34 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   35 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
   36 **
   37 ** $QT_END_LICENSE$
   38 **
   39 ****************************************************************************/
   40 
   41 #ifndef QTLOCKEDFILE_H
   42 #define QTLOCKEDFILE_H
   43 
   44 #include <QFile>
   45 #ifdef Q_OS_WIN
   46 #include <QVector>
   47 #endif
   48 
   49 #if defined(Q_OS_WIN)
   50 #  if !defined(QT_QTLOCKEDFILE_EXPORT) && !defined(QT_QTLOCKEDFILE_IMPORT)
   51 #    define QT_QTLOCKEDFILE_EXPORT
   52 #  elif defined(QT_QTLOCKEDFILE_IMPORT)
   53 #    if defined(QT_QTLOCKEDFILE_EXPORT)
   54 #      undef QT_QTLOCKEDFILE_EXPORT
   55 #    endif
   56 #    define QT_QTLOCKEDFILE_EXPORT __declspec(dllimport)
   57 #  elif defined(QT_QTLOCKEDFILE_EXPORT)
   58 #    undef QT_QTLOCKEDFILE_EXPORT
   59 #    define QT_QTLOCKEDFILE_EXPORT __declspec(dllexport)
   60 #  endif
   61 #else
   62 #  define QT_QTLOCKEDFILE_EXPORT
   63 #endif
   64 
   65 namespace QtLP_Private
   66 {
   67 
   68 class QT_QTLOCKEDFILE_EXPORT QtLockedFile : public QFile
   69 {
   70 public:
   71     enum LockMode { NoLock = 0, ReadLock, WriteLock };
   72 
   73     QtLockedFile();
   74     explicit QtLockedFile(const QString& name);
   75     ~QtLockedFile();
   76 
   77     bool open(OpenMode mode);
   78 
   79     bool lock(LockMode mode, bool block = true);
   80     bool unlock();
   81     bool isLocked() const;
   82     LockMode lockMode() const;
   83 
   84 private:
   85 #ifdef Q_OS_WIN
   86     Qt::HANDLE wmutex;
   87     Qt::HANDLE rmutex;
   88     QVector<Qt::HANDLE> rmutexes;
   89     QString mutexname;
   90 
   91     Qt::HANDLE getMutexHandle(int idx, bool doCreate);
   92     bool waitMutex(Qt::HANDLE mutex, bool doBlock);
   93 
   94 #endif
   95     LockMode m_lock_mode;
   96 };
   97 }
   98 #endif