root/juggler/tags/1.0.7/SharedMem/vjMemPoolWin32.h

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 *
 * VR Juggler is (C) Copyright 1998, 1999, 2000, 2001, 2002
 *   by Iowa State University
 *
 * Original Authors:
 *   Allen Bierbaum, Christopher Just,
 *   Patrick Hartling, Kevin Meinert,
 *   Carolina Cruz-Neira, Albert Baker
 *
 * 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
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 * 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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
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 * File:          $RCSfile$
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#ifndef _MemPoolWin32_h_
#define _MemPoolWin32_h_
//----------------------------------------------
// vjMemPoolWin32
//
// Purpose:
//    Shared Memory pool on the win32 systems
//    Used by vjMemory (Base class) to control allocation
//    and deallocation from a "memory pool"
//
// Use:
//    Clients should create memory pools as needed
//    Then when objects are created, they can pass
//    a pool as a parameter to the new (if the object
//    is a derived from vjMemory)
//
// NOTE:
//    The static function 'init' MUST be called before
//    any forks or other process splitting take place.
//    This is because it sets static data that must
//    be shared across processes.
//
// Author:
//      Andy Himberger
//
// Date: 11-6-97
//-----------------------------------------------

#include <vjConfig.h>
#include <stdio.h>
#include <windows.h>



class vjMemPoolWin32 : public vjMemPool
{
public:    
   vjMemPoolWin32(size_t initialSize = 65536,  int numProcs = 8, char* staticTempName = "memPoolWin32XXXXXX") {
       std::cerr << "\nvjMemPoolWin32: Allocating arena ("
                 << initialSize << " bytes, "
                 << numProcs  << " procs"
                 << ")\n" << std::flush;
   }

   virtual ~vjMemPoolWin32() {
       std::cerr << "\nUnlinking: " << std::endl;
   }       

public:
   virtual void* allocate(size_t size)
   {
      void* retval;
      retval = malloc(size);

      if (retval == NULL)
         std::cerr << "MemPoolWin32: Out of memory!!!" << std::endl;

      return retval;    
   }

   virtual void* reallocate(void* ptr, size_t size)
   {
      void* retval;
      retval = realloc(ptr,size);
      std::cerr << "MemPoolWin32: realloc failure" << std::endl;

      return retval;
   }

   virtual void deallocate(void* ptr)
   {
      free(ptr);
   }

public:      // Non-virtual functions


   public:
   // Function must be called before any vjMemPools are created.
   // Automatically called by the first new with default values if not called
   // previously
   // Function to initialize any STATIC data structures
   static void init(size_t initialSize = 32768, int numProcs = 64,
                    char* staticTempName = "/var/tmp/memPoolsArenaXXXXXX")
   {
      std::cerr << "\nvjMemPoolWin32: Allocating Base Arena for ALL "
                << "vjMemPoolWin32's.\n  "
                << initialSize << " bytes, "
                << numProcs << " procs"
                << "\n" << std::flush;
   }

   void* operator new(size_t sz)
   {   
        std::cerr << "MemPoolWin32::new called.\n";
      //if (arenaForMemPools == NULL)
      //  init();       // Make sure that we are initialized already.

      return malloc(sizeof(vjMemPoolWin32));   
   }

   void operator delete(void* ptr)
   { 
      free(ptr);
   } 
private:
   void*   arena;
   char*   arenaFileName;

private:    // Static data for all members -- Must be set before forks!!!!
   static void* arenaForMemPools;
   static char* arenaForMemPoolsFileName;
};


#endif