SharedMemoryBlock.h++

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/* ---------------------------------------------------------------------------
   commonc++ - A C++ Common Class Library
   Copyright (C) 2005-2014  Mark A Lindner

   This file is part of commonc++.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   ---------------------------------------------------------------------------
*/

#ifndef __ccxx_SharedMemoryBlock_hxx
#define __ccxx_SharedMemoryBlock_hxx

#include <commonc++/Common.h++>
#include <commonc++/MemoryBlock.h++>
#include <commonc++/Permissions.h++>
#include <commonc++/String.h++>
#include <commonc++/SystemException.h++>

namespace ccxx {

class COMMONCPP_API SharedMemoryBlock : public MemoryBlock
{
 public:

  SharedMemoryBlock(const String& name, size_t size,
                    const Permissions& perm = Permissions::USER_READ_WRITE);

  ~SharedMemoryBlock();

  void attach(bool readOnly = false);

  void detach();

  virtual void setBase(byte_t* base);

  virtual void setSize(size_t size);

  inline String getName() const
  { return(_name); }

 private:

  String _name;
  Permissions _perm;

#ifdef CCXX_OS_WINDOWS
  HANDLE _handle;
#else
  int _handle;
#endif
};

} // namespace ccxx

#endif // __ccxx_SharedMemoryBlock_hxx