text: /****************************************************************************
  **
  ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
  ** Contact: http://www.qt-project.org/legal
  **
  ** This file is part of the QtCore module of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:LGPL$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and Digia.  For licensing terms and
  ** conditions see http://qt.digia.com/licensing.  For further information
  ** use the contact form at http://qt.digia.com/contact-us.
  **
  ** GNU Lesser General Public License Usage
  ** Alternatively, this file may be used under the terms of the GNU Lesser
  ** General Public License version 2.1 as published by the Free Software
  ** Foundation and appearing in the file LICENSE.LGPL included in the
  ** packaging of this file.  Please review the following information to
  ** ensure the GNU Lesser General Public License version 2.1 requirements
  ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
  **
  ** In addition, as a special exception, Digia gives you certain additional
  ** rights.  These rights are described in the Digia Qt LGPL Exception
  ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
  **
  ** GNU General Public License Usage
  ** Alternatively, this file may be used under the terms of the GNU
  ** General Public License version 3.0 as published by the Free Software
  ** Foundation and appearing in the file LICENSE.GPL included in the
  ** packaging of this file.  Please review the following information to
  ** ensure the GNU General Public License version 3.0 requirements will be
  ** met: http://www.gnu.org/copyleft/gpl.html.
  **
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/
  
  #ifndef QSHAREDMEMORY_P_H
  #define QSHAREDMEMORY_P_H
  
  //
  //  W A R N I N G
  //  -------------
  //
  // This file is not part of the Qt API.  It exists purely as an
  // implementation detail.  This header file may change from version to
  // version without notice, or even be removed.
  //
  // We mean it.
  //
  
  #include "qsharedmemory.h"
  
  #ifdef QT_NO_SHAREDMEMORY
  # ifndef QT_NO_SYSTEMSEMAPHORE
  namespace QSharedMemoryPrivate
  {
      int createUnixKeyFile(const QString &fileName);
      QString makePlatformSafeKey(const QString &key,
              const QString &prefix = QLatin1String("qipc_sharedmemory_"));
  }
  #endif
  #else
  
  #include "qsystemsemaphore.h"
  #include "private/qobject_p.h"
  
  #ifdef Q_OS_WIN
  #  include <qt_windows.h>
  #elif defined(Q_OS_SYMBIAN)
  #  include <e32std.h>
  #  include <sys/types.h>
  #else
  #  include <sys/types.h>
  #endif
  
  QT_BEGIN_NAMESPACE
  
  #ifndef QT_NO_SYSTEMSEMAPHORE
  /*!
    Helper class
    */
  class QSharedMemoryLocker
  {
  
  public:
      inline QSharedMemoryLocker(QSharedMemory *sharedMemory) : q_sm(sharedMemory)
      {
          Q_ASSERT(q_sm);
      }
  
      inline ~QSharedMemoryLocker()
      {
          if (q_sm)
              q_sm->unlock();
      }
  
      inline bool lock()
      {
          if (q_sm && q_sm->lock())
              return true;
          q_sm = 0;
          return false;
      }
  
  private:
      QSharedMemory *q_sm;
  };
  #endif // QT_NO_SYSTEMSEMAPHORE
  
  class Q_AUTOTEST_EXPORT QSharedMemoryPrivate : public QObjectPrivate
  {
      Q_DECLARE_PUBLIC(QSharedMemory)
  
  public:
      QSharedMemoryPrivate();
  
      void *memory;
      int size;
      QString key;
      QString nativeKey;
      QSharedMemory::SharedMemoryError error;
      QString errorString;
  #ifndef QT_NO_SYSTEMSEMAPHORE
      QSystemSemaphore systemSemaphore;
      bool lockedByMe;
  #endif
  
      static int createUnixKeyFile(const QString &fileName);
      static QString makePlatformSafeKey(const QString &key,
              const QString &prefix = QLatin1String("qipc_sharedmemory_"));
  #ifdef Q_OS_WIN
      HANDLE handle();
  #elif defined(QT_POSIX_IPC)
      int handle();
  #else
      key_t handle();
  #endif
      bool initKey();
      void cleanHandle();
      bool create(int size);
      bool attach(QSharedMemory::AccessMode mode);
      bool detach();
  
  #ifdef Q_OS_SYMBIAN
      void setErrorString(const QString &function, TInt errorCode);
  #else
      void setErrorString(const QString &function);
  #endif
  
  #ifndef QT_NO_SYSTEMSEMAPHORE
      inline bool tryLocker(QSharedMemoryLocker *locker, const QString &function) {
          if (!locker->lock()) {
              errorString = QSharedMemory::tr("%1: unable to lock").arg(function);
              error = QSharedMemory::LockError;
              return false;
          }
          return true;
      }
  #endif // QT_NO_SYSTEMSEMAPHORE
  
  private:
  #ifdef Q_OS_WIN
      HANDLE hand;
  #elif defined(Q_OS_SYMBIAN)
      RChunk chunk;
  #elif defined(QT_POSIX_IPC)
      int hand;
  #else
      key_t unix_key;
  #endif
  };
  
  QT_END_NAMESPACE
  
  #endif // QT_NO_SHAREDMEMORY
  
  #endif // QSHAREDMEMORY_P_H
  
  