MPQC 2.3.1

- Main Page
- Related Pages
- Classes
- Files

- File List

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
38 namespace sc {
39
40 class GlobalMsgIter: public DescribedClass {
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);
56 ~GlobalMsgIter();
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
69 class MessageGrp;
70 class MachineTopology: public DescribedClass {
71 public:
72 MachineTopology();
73 MachineTopology(const Ref<KeyVal>&);
74 ~MachineTopology();
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: