MPQC 2.3.1
globcnt.h
1//
2// globcnt.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 __GNUC__
29#pragma interface
30#endif
31
32#ifndef _util_group_globcnt_h
33#define _util_group_globcnt_h
34
35namespace sc {
36
37// A process can create a GlobalCounter using the void CTOR.
38// This process can share the string representation of the
39// counter with other processes. They can then use the const
40// char * CTOR to create global counters that reference the
41// same global counter.
42
43class GlobalCounter {
44 private:
45 int semid_;
46 int controls_release_;
47
48 void cleanup();
49
50 public:
51 GlobalCounter();
52 void initialize();
53 void initialize(const char *stringrep);
54 ~GlobalCounter();
55
56 char *stringrep();
57
58 void wait_for_zero();
59 void operator += (int);
60 void operator ++();
61 void operator --();
62 void operator ++(int) { operator++(); }
63 void operator --(int) { operator--(); }
64 void operator = (int);
65
66 int val();
67};
68
69}
70
71#endif
72
73// Local Variables:
74// mode: c++
75// c-file-style: "CLJ"
76// End:

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