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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
35 namespace 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
43 class 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: