globcnt.h Source File

00001 //
00002 // globcnt.h
00003 //
00004 // Copyright (C) 1996 Limit Point Systems, Inc.
00005 //
00006 // Author: Curtis Janssen <cljanss@limitpt.com>
00007 // Maintainer: LPS
00008 //
00009 // This file is part of the SC Toolkit.
00010 //
00011 // The SC Toolkit is free software; you can redistribute it and/or modify
00012 // it under the terms of the GNU Library General Public License as published by
00013 // the Free Software Foundation; either version 2, or (at your option)
00014 // any later version.
00015 //
00016 // The SC Toolkit is distributed in the hope that it will be useful,
00017 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00018 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00019 // GNU Library General Public License for more details.
00020 //
00021 // You should have received a copy of the GNU Library General Public License
00022 // along with the SC Toolkit; see the file COPYING.LIB.  If not, write to
00023 // the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
00024 //
00025 // The U.S. Government is granted a limited license as per AL 91-7.
00026 //
00027 
00028 #ifdef __GNUC__
00029 #pragma interface
00030 #endif
00031 
00032 #ifndef _util_group_globcnt_h
00033 #define _util_group_globcnt_h
00034 
00035 namespace sc {
00036 
00037 // A process can create a GlobalCounter using the void CTOR.
00038 // This process can share the string representation of the
00039 // counter with other processes.  They can then use the const
00040 // char * CTOR to create global counters that reference the
00041 // same global counter.
00042 
00043 class GlobalCounter {
00044   private:
00045     int semid_;
00046     int controls_release_;
00047 
00048     void cleanup();
00049     
00050   public:
00051     GlobalCounter();
00052     void initialize();
00053     void initialize(const char *stringrep);
00054     ~GlobalCounter();
00055 
00056     char *stringrep();
00057 
00058     void wait_for_zero();
00059     void operator += (int);
00060     void operator ++();
00061     void operator --();
00062     void operator ++(int) { operator++(); }
00063     void operator --(int) { operator--(); }
00064     void operator = (int);
00065 
00066     int val();
00067 };
00068 
00069 }
00070 
00071 #endif
00072 
00073 // Local Variables:
00074 // mode: c++
00075 // c-file-style: "CLJ"
00076 // End: