MPIStream.h

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// -*- C++ -*-

// PLearn (A C++ Machine Learning Library)
// Copyright (C) 1998 Pascal Vincent
// Copyright (C) 1999-2002 Pascal Vincent, Yoshua Bengio and University of Montreal
//

// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// 
//  1. Redistributions of source code must retain the above copyright
//     notice, this list of conditions and the following disclaimer.
// 
//  2. Redistributions in binary form must reproduce the above copyright
//     notice, this list of conditions and the following disclaimer in the
//     documentation and/or other materials provided with the distribution.
// 
//  3. The name of the authors may not be used to endorse or promote
//     products derived from this software without specific prior written
//     permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
// OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
// NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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// 
// This file is part of the PLearn library. For more information on the PLearn
// library, go to the PLearn Web site at www.plearn.org


 

/* *******************************************************      
   * $Id: MPIStream.h,v 1.4 2004/07/21 16:30:51 chrish42 Exp $
   * AUTHORS: Pascal Vincent 
   * This file is part of the PLearn library.
   ******************************************************* */


#ifndef MPIStream_INC
#define MPIStream_INC

#if USING_MPI

#include <iostream>
#include <plearn/sys/PLMPI.h>

namespace PLearn {
using namespace std;

  class MPIStreambuf : public streambuf
  {
  protected:
    int tag; 
    int peerrank; 
  
    char* inbuf;
    int inbuf_capacity;
  
  protected:

    inline void reserveInputBuffer(int buflen)
    {
      if(buflen>inbuf_capacity)
        {
          if(inbuf)
            delete[] inbuf;
          inbuf = new char[buflen];
          inbuf_capacity = buflen;
        }
    }

    virtual int overflow(int c=EOF);
    virtual int underflow();
    // virtual int uflow();
    virtual int showmanyc();
    virtual streamsize xsputn(const char* s, streamsize n);
    virtual streamsize xsgetn(char* s, streamsize n);
    virtual streambuf* setbuf(char* p, int len);
    virtual int sync();

  public:
    MPIStreambuf(int the_peerrank, int inbufsize);
    virtual ~MPIStreambuf();

  };
  
  class MPIStream: public iostream
  {
  protected:
    char* outbuffer;

  public:

    MPIStream()
      :iostream(0), outbuffer(0)
    {}

    MPIStream(int the_peerrank, int inbufsize=200, int outbufsize=200)
      :iostream(0), outbuffer(0)
    { init(the_peerrank, inbufsize, outbufsize); }

    void init(int the_peerrank, int inbufsize= 0, int outbufsize= 0);

    ~MPIStream();
  };


  // implements an "array" with streams open to all nodes
  class MPIStreams
  {
  protected:
    MPIStream* mpistreams;

  public:
    MPIStreams(int inbufsize=200, int outbufsize=200);

    int size() const { return PLMPI::size; } 
    int length() const { return PLMPI::size; } 

    iostream& operator[](int i)
    {
#ifdef BOUNDCHECK
      if(i<0 || i>=PLMPI::size)
        PLERROR("In MPIStreams OUT OF BOUND ACCESS");
#endif      
      return mpistreams[i];
    }

    ~MPIStreams() 
    { if(mpistreams) delete[] mpistreams; }
  };

} // end of namespace PLearn

#endif 

#endif

---