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LOW_sharedMemSegment_SysV.h

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00001 /***************************************************************************
00002                           LOW_sharedMemSegmentSysV.h  -  description
00003                              -------------------
00004     begin                : Tue Jul 30 2002
00005     copyright            : (C) 2002 by Harald Roelle, Helmut Reiser
00006     email                : roelle@informatik.uni-muenchen.de, reiser@informatik.uni-muenchen.de
00007  ***************************************************************************/
00008 
00009 /***************************************************************************
00010  *                                                                         *
00011  *   This program is free software; you can redistribute it and/or modify  *
00012  *   it under the terms of the GNU General Public License as published by  *
00013  *   the Free Software Foundation; either version 2 of the License, or     *
00014  *   (at your option) any later version.                                   *
00015  *                                                                         *
00016  ***************************************************************************/
00017 
00018 #ifndef LOW_SHAREDMEMSEGMENT_SYSV_H
00019 #define LOW_SHAREDMEMSEGMENT_SYSV_H
00020 
00021 
00022 #include "LOW_sharedMemSegment.h"
00023 #include "LOW_sharedMemSegmentFactory.h"
00024 
00025 
00026 /** Platform specific sharedMemSegment for Unix System V platforms.
00027 
00028     @author Harald Roelle, Helmut Reiser
00029  */
00030 class LOW_sharedMemSegment_SysV : public LOW_sharedMemSegment  {
00031 
00032 //=======================================================================================
00033 public: 
00034   
00035   //=====================================================================================
00036   //
00037   // constructors
00038   //
00039   
00040   /** Constructor.
00041       @param inSharedMemIPCKey  Unique identifier for new shared memory segment.
00042                                 To get such an identifier see LOW_IPCKeyGenerator.
00043       @param inSize             Size of the segment in bytes.
00044    */
00045   LOW_sharedMemSegment_SysV( const LOW_sharedMemSegmentFactory::sharedMemSegmentIPCKey_t inKey,
00046                              const unsigned int inSize);
00047 
00048   /** Destructor.
00049    */  
00050   virtual ~LOW_sharedMemSegment_SysV();
00051 
00052 
00053   //=====================================================================================
00054   //
00055   // methods
00056   //
00057   
00058   void* get() const;
00059 
00060   
00061 //=======================================================================================
00062 private: 
00063 
00064   //=====================================================================================
00065   //
00066   // constants
00067   //
00068   
00069   static const int SHM_PERMS = 0770;  /**< Permissions for the shm segments. */
00070   
00071   
00072   //=====================================================================================
00073   //
00074   // attributes
00075   //
00076   
00077   const key_t         sharedMemSegKey;  /**< IPC key of the segment. */
00078   int                 sharedMemSegID;   /**< Sys V segment ID. */
00079   void*               sharedMemPtr;     /**< Pointer to the segment. */
00080 };
00081 
00082 #endif

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