VirtualMemory.h

//-*-C++-*-
/***************************************************************************
 *
 *   Copyright (C) 2008 by Willem van Straten
 *   Licensed under the Academic Free License version 2.1
 *
 ***************************************************************************/
 
// psrchive/Util/genutil/VirtualMemory.h
 
#ifndef __VirtualMemory_h
#define __VirtualMemory_h
 
#include "TemporaryFile.h"
#include "ThreadContext.h"
 
#include <map>
#include <inttypes.h>

class VirtualMemory : public TemporaryFile
{
 public:

  VirtualMemory (const std::string& filename, bool unlink = true);

  ~VirtualMemory ();

  template<typename T>
  T* create (unsigned elements)
  { return reinterpret_cast<T*>( mmap (elements * sizeof(T)) ); }

  void destroy (void* pointer)
  { munmap (pointer); }
 
 private:

  void* mmap (uint64_t length);

  void munmap (void*);
 
  typedef std::map<char*, uint64_t> Map;
  typedef Map::iterator Block;

  void add_allocated (char* ptr, uint64_t size);

  Block find_allocated (char* ptr);

  Block add_available (char* ptr, uint64_t size);

  Block find_available (uint64_t size);

  Map available;

  Map allocated;

  ThreadContext* context;

  Block extend (uint64_t size);

  uint64_t swap_space;

  void destroy ();
 
};
 
#endif