dcmimgle/include/dcmtk/dcmimgle/diobjcou.h

00001 /*
00002  *
00003  *  Copyright (C) 1996-2010, OFFIS e.V.
00004  *  All rights reserved.  See COPYRIGHT file for details.
00005  *
00006  *  This software and supporting documentation were developed by
00007  *
00008  *    OFFIS e.V.
00009  *    R&D Division Health
00010  *    Escherweg 2
00011  *    D-26121 Oldenburg, Germany
00012  *
00013  *
00014  *  Module:  dcmimgle
00015  *
00016  *  Author:  Joerg Riesmeier
00017  *
00018  *  Purpose: DicomObjectCounter (Header)
00019  *
00020  *  Last Update:      $Author: joergr $
00021  *  Update Date:      $Date: 2010-10-14 13:16:26 $
00022  *  CVS/RCS Revision: $Revision: 1.14 $
00023  *  Status:           $State: Exp $
00024  *
00025  *  CVS/RCS Log at end of file
00026  *
00027  */
00028 
00029 
00030 #ifndef DIOBJCOU_H
00031 #define DIOBJCOU_H
00032 
00033 #include "dcmtk/config/osconfig.h"
00034 
00035 #ifdef WITH_THREADS
00036 #include "dcmtk/ofstd/ofthread.h"
00037 #endif
00038 
00039 
00040 /*---------------------*
00041  *  class declaration  *
00042  *---------------------*/
00043 
00047 class DiObjectCounter
00048 {
00049 
00050  public:
00051 
00055     inline void addReference()
00056     {
00057 #ifdef WITH_THREADS
00058         theMutex.lock();
00059 #endif
00060         ++Counter;
00061 #ifdef WITH_THREADS
00062         theMutex.unlock();
00063 #endif
00064     }
00065 
00069     inline void removeReference()
00070     {
00071 #ifdef WITH_THREADS
00072         theMutex.lock();
00073 #endif
00074         if (--Counter == 0)
00075         {
00076 #ifdef WITH_THREADS
00077             theMutex.unlock();
00078 #endif
00079             delete this;
00080 #ifdef WITH_THREADS
00081         } else {
00082             theMutex.unlock();
00083 #endif
00084         }
00085     }
00086 
00087 
00088  protected:
00089 
00093     DiObjectCounter()
00094       : Counter(1)
00095 #ifdef WITH_THREADS
00096        ,theMutex()
00097 #endif
00098     {
00099     }
00100 
00103     virtual ~DiObjectCounter()
00104     {
00105     }
00106 
00107 
00108  private:
00109 
00111     unsigned long Counter;
00112 
00113 #ifdef WITH_THREADS
00114 
00117     OFMutex theMutex;
00118 #endif
00119 };
00120 
00121 
00122 #endif
00123 
00124 
00125 /*
00126  *
00127  * CVS/RCS Log:
00128  * $Log: diobjcou.h,v $
00129  * Revision 1.14  2010-10-14 13:16:26  joergr
00130  * Updated copyright header. Added reference to COPYRIGHT file.
00131  *
00132  * Revision 1.13  2010-10-04 14:44:45  joergr
00133  * Replaced "#ifdef _REENTRANT" by "#ifdef WITH_THREADS" where appropriate (i.e.
00134  * in all cases where OFMutex, OFReadWriteLock, etc. are used).
00135  *
00136  * Revision 1.12  2010-03-01 09:08:47  uli
00137  * Removed some unnecessary include directives in the headers.
00138  *
00139  * Revision 1.11  2005-12-08 16:47:59  meichel
00140  * Changed include path schema for all DCMTK header files
00141  *
00142  * Revision 1.10  2003/12/23 15:53:22  joergr
00143  * Replaced post-increment/decrement operators by pre-increment/decrement
00144  * operators where appropriate (e.g. 'i++' by '++i').
00145  *
00146  * Revision 1.9  2003/12/08 19:30:16  joergr
00147  * Removed leading underscore characters from preprocessor symbols (reserved
00148  * symbols). Updated copyright header.
00149  *
00150  * Revision 1.8  2001/06/01 15:49:48  meichel
00151  * Updated copyright header
00152  *
00153  * Revision 1.7  2000/07/12 12:47:47  joergr
00154  * Correct bug in destructor of ObjectCounter class.
00155  *
00156  * Revision 1.6  2000/05/25 10:35:23  joergr
00157  * Added member variable to member initialization list (avoid compiler
00158  * warnings).
00159  *
00160  * Revision 1.5  2000/04/28 12:30:51  joergr
00161  * ObjectCounter uses now class OFMutex to be MT-safe.
00162  *
00163  * Revision 1.4  2000/03/08 16:24:21  meichel
00164  * Updated copyright header.
00165  *
00166  * Revision 1.3  1999/09/17 12:44:08  joergr
00167  * Added/changed/completed DOC++ style comments in the header files.
00168  *
00169  * Revision 1.2  1999/03/24 17:20:18  joergr
00170  * Added/Modified comments and formatting.
00171  *
00172  * Revision 1.1  1998/11/27 15:40:30  joergr
00173  * Added copyright message.
00174  *
00175  * Revision 1.3  1998/05/11 14:53:24  joergr
00176  * Added CVS/RCS header to each file.
00177  *
00178  *
00179  */


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