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messshm.h

//
// messshm.h
//
// Copyright (C) 1996 Limit Point Systems, Inc.
//
// Author: Curtis Janssen <cljanss@limitpt.com>
// Maintainer: LPS
//
// This file is part of the SC Toolkit.
//
// The SC Toolkit 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 version 2, or (at your option)
// any later version.
//
// The SC Toolkit is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public License
// along with the SC Toolkit; see the file COPYING.LIB.  If not, write to
// the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
//
// The U.S. Government is granted a limited license as per AL 91-7.
//

#ifndef _util_group_messshm_h
#define _util_group_messshm_h

#include <util/group/message.h>

class ShmMessageGrp: public intMessageGrp {
  protected:
    void basic_send(int target, int type, void* data, int nbyte);
    void basic_recv(int type, void* data, int nbyte);
    int basic_probe(int type);
    void initialize(int nprocs);
    void initialize();

    // Information about the last message received or probed.
    int last_type_;
    int last_source_;
    int last_size_; // the size in bytes

    void set_last_type(int a) { last_type_ = a; }
    void set_last_source(int a) { last_source_ = a; }
    void set_last_size(int a) { last_size_ = a; }
  public:
    ShmMessageGrp(); // read nprocs from environmental variable NUMPROC
    ShmMessageGrp(const Ref<KeyVal>&);
    ShmMessageGrp(int nprocs);
    ~ShmMessageGrp();
    void sync();
 
    int last_source();
    int last_size();
    int last_type();
};

#endif

// Local Variables:
// mode: c++
// c-file-style: "CLJ"
// End:

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