ground/gcs/src/shared/qtlockedfile/qtlockedfile.h

   1 /**
   2  ******************************************************************************
   3  *
   4  * @file       qtlockedfile.h
   5  * @author     The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
   6  *             Parts by Nokia Corporation (qt-info@nokia.com) Copyright (C) 2009.
   7  * @brief
   8  * @see        The GNU Public License (GPL) Version 3
   9  * @defgroup
  10  * @{
  11  *
  12  *****************************************************************************/
  13 /*
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 3 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful, but
  20  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  21  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  22  * for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License along
  25  * with this program; if not, write to the Free Software Foundation, Inc.,
  26  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  27  */
  28
  29 #ifndef QTLOCKEDFILE_H
  30 #define QTLOCKEDFILE_H
  31
  32 #include <QtCore/QFile>
  33
  34 #if defined(Q_OS_WIN)
  35 #  if !defined(QT_QTLOCKEDFILE_EXPORT) && !defined(QT_QTLOCKEDFILE_IMPORT)
  36 #    define QT_QTLOCKEDFILE_EXPORT
  37 #  elif defined(QT_QTLOCKEDFILE_IMPORT)
  38 #    if defined(QT_QTLOCKEDFILE_EXPORT)
  39 #      undef QT_QTLOCKEDFILE_EXPORT
  40 #    endif
  41 #    define QT_QTLOCKEDFILE_EXPORT __declspec(dllimport)
  42 #  elif defined(QT_QTLOCKEDFILE_EXPORT)
  43 #    undef QT_QTLOCKEDFILE_EXPORT
  44 #    define QT_QTLOCKEDFILE_EXPORT __declspec(dllexport)
  45 #  endif
  46 #else
  47 #  define QT_QTLOCKEDFILE_EXPORT
  48 #endif
  49
  50 namespace SharedTools {
  51 class QT_QTLOCKEDFILE_EXPORT QtLockedFile : public QFile {
  52 public:
  53     enum LockMode { NoLock = 0, ReadLock, WriteLock };
  54
  55     QtLockedFile();
  56     QtLockedFile(const QString &name);
  57     ~QtLockedFile();
  58
  59     bool lock(LockMode mode, bool block = true);
  60     bool unlock();
  61     bool isLocked() const;
  62     LockMode lockMode() const;
  63
  64 private:
  65 #ifdef Q_OS_WIN
  66     Qt::HANDLE m_semaphore_hnd;
  67     Qt::HANDLE m_mutex_hnd;
  68 #endif
  69     LockMode m_lock_mode;
  70 };
  71 } // namespace SharedTools
  72
  73 #endif // QTLOCKEDFILE_H