MPQC 2.3.1
topology.h
1//
2// topology.h
3//
4// Copyright (C) 1996 Limit Point Systems, Inc.
5//
6// Author: Curtis Janssen <cljanss@limitpt.com>
7// Maintainer: LPS
8//
9// This file is part of the SC Toolkit.
10//
11// The SC Toolkit is free software; you can redistribute it and/or modify
12// it under the terms of the GNU Library General Public License as published by
13// the Free Software Foundation; either version 2, or (at your option)
14// any later version.
15//
16// The SC Toolkit is distributed in the hope that it will be useful,
17// but WITHOUT ANY WARRANTY; without even the implied warranty of
18// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19// GNU Library General Public License for more details.
20//
21// You should have received a copy of the GNU Library General Public License
22// along with the SC Toolkit; see the file COPYING.LIB. If not, write to
23// the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
24//
25// The U.S. Government is granted a limited license as per AL 91-7.
26//
27
28#ifdef __GNUG__
29#pragma interface
30#endif
31
32#ifndef _util_group_topology_h
33#define _util_group_topology_h
34
35#include <util/class/class.h>
36#include <util/keyval/keyval.h>
37
38namespace sc {
39
41 protected:
42 int me_;
43 int nproc_;
44 int root_;
45 int i_;
46 int n_; // the number of steps--intialized by derived class CTORs
47 int fwd_;
48
49 // for sending messages in the forward direction (like a bcast)
50 virtual int fwdsendto() = 0;
51 virtual int fwdsend() = 0;
52 virtual int fwdrecvfrom() = 0;
53 virtual int fwdrecv() = 0;
54 public:
55 GlobalMsgIter(int nproc, int me, int root = 0);
57 void backwards() { fwd_ = 0; i_ = n_ - 1; }
58 void forwards() { fwd_ = 1; i_ = 0; }
59 void next() { if (fwd_) i_++; else i_--; }
60 int done() { return i_<0 || i_>=n_; }
61 int n() { return n_; }
62 int sendto() { return fwd_?fwdsendto():fwdrecvfrom(); }
63 int send() { return fwd_?fwdsend():fwdrecv(); }
64 int recvfrom() { return fwd_?fwdrecvfrom():fwdsendto(); }
65 int recv() { return fwd_?fwdrecv():fwdsend(); }
66};
67
68
69class MessageGrp;
71 public:
75
76 virtual Ref<GlobalMsgIter> global_msg_iter(const Ref<MessageGrp>&,
77 int target) = 0;
78};
79
80}
81
82#endif
83
84// Local Variables:
85// mode: c++
86// c-file-style: "CLJ"
87// End:
Classes which need runtime information about themselves and their relationship to other classes can v...
Definition: class.h:244
Definition: topology.h:40
Definition: topology.h:70
The MessageGrp abstract class provides a mechanism for moving data and objects between nodes in a par...
Definition: message.h:109
A template class that maintains references counts.
Definition: ref.h:332

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