topology.h
//
// topology.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.
//
#ifdef __GNUG__
#pragma interface
#endif
#ifndef _util_group_topology_h
#define _util_group_topology_h
#include <util/class/class.h>
#include <util/keyval/keyval.h>
namespace sc {
class GlobalMsgIter: public DescribedClass {
protected:
int me_;
int nproc_;
int root_;
int i_;
int n_; // the number of steps--intialized by derived class CTORs
int fwd_;
// for sending messages in the forward direction (like a bcast)
virtual int fwdsendto() = 0;
virtual int fwdsend() = 0;
virtual int fwdrecvfrom() = 0;
virtual int fwdrecv() = 0;
public:
GlobalMsgIter(int nproc, int me, int root = 0);
~GlobalMsgIter();
void backwards() { fwd_ = 0; i_ = n_ - 1; }
void forwards() { fwd_ = 1; i_ = 0; }
void next() { if (fwd_) i_++; else i_--; }
int done() { return i_<0 || i_>=n_; }
int n() { return n_; }
int sendto() { return fwd_?fwdsendto():fwdrecvfrom(); }
int send() { return fwd_?fwdsend():fwdrecv(); }
int recvfrom() { return fwd_?fwdrecvfrom():fwdsendto(); }
int recv() { return fwd_?fwdrecv():fwdsend(); }
};
class MessageGrp;
class MachineTopology: public DescribedClass {
public:
MachineTopology();
MachineTopology(const Ref<KeyVal>&);
~MachineTopology();
virtual Ref<GlobalMsgIter> global_msg_iter(const Ref<MessageGrp>&,
int target) = 0;
};
}
#endif
// Local Variables:
// mode: c++
// c-file-style: "CLJ"
// End: