#ifndef MMFMGR_H
#define MMFMGR_H
/////////////////////////////////////////////////////////////////////////
// MMFmgr.h - Provides management of shared memory for IPC             //
//                                                                     //
// Jim Fawcett, CSE775 - Distributed Objects, MT1-Q4, Spring 2009      //
/////////////////////////////////////////////////////////////////////////

#include <string>
#include <process.h>
#include <windows.h>

class RWToggle
{
public:
  RWToggle(std::wstring name);
  ~RWToggle();
  void setRead();
  void setWrite();
  void readWait();
  void writeWait();
  bool isReadyForReading();
  bool isReadyForWriting();
  void writerLock();
  void writerUnlock();
private:
  HANDLE hRead_;
  HANDLE hWrite_;
  HANDLE hWritersLock_;
  bool readReady;
  std::wstring name_;
};

typedef char* Block;

class MMFmgr
{
public:
  MMFmgr(const std::wstring& name, size_t size);
  ~MMFmgr();
  void putBlock(Block blk);
  Block getBlock();
  void putString(const std::wstring& str);
  std::wstring getString();
  void clear();
private:
  size_t size_;
  HANDLE hMMF_;
  wchar_t* pMMF_;
  RWToggle rwt_;
};

#endif