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ReferenceCounter.hpp

00001  /***********************************************************************
00002  *                                                                      *
00003  * ViTooKi                                                              *
00004  *                                                                      *
00005  * title:       ReferenceCounter.hpp                                          *
00006  *                                                                      *
00007  *                                                                      *
00008  *                                                                      *
00009  * ITEC institute of the University of Klagenfurt (Austria)             *
00010  * http://www.itec.uni-klu.ac.at                                        *
00011  *                                                                      *
00012  *                                                                      *
00013  * For more information visit the ViTooKi homepage:                     *
00014  * http://ViTooKi.sourceforge.net                                       *
00015  * vitooki-user@lists.sourceforge.net                                   *
00016  * vitooki-devel@lists.sourceforge.net                                  *
00017  *                                                                      *
00018  * This file is part of ViTooKi, a free video toolkit.                  *
00019  * ViTooKi is free software; you can redistribute it and/or             *
00020  * modify it under the terms of the GNU General Public License          *
00021  * as published by the Free Software Foundation; either version 2       *
00022  * of the License, or (at your option) any later version.               *
00023  *                                                                      *
00024  * This program is distributed in the hope that it will be useful,      *
00025  * but WITHOUT ANY WARRANTY; without even the implied warranty of       *
00026  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the         *
00027  * GNU General Public License for more details.                         *
00028  *                                                                      *
00029  * You should have received a copy of the GNU General Public License    *
00030  * along with this program; if not, write to the Free Software          *
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00032  * MA  02111-1307, USA.                                                 *
00033  *                                                                      *
00034  ***********************************************************************/
00035 
00036  /***********************************************************************
00037  *                                                                      *
00038  *  REVISION HISTORY:                                                   *
00039  *                                                                      *
00040  *                                                                      *
00041  *                                                                      *
00042  ***********************************************************************/
00043 
00044 #ifndef _PS_MPEG4ITEC_REFERENCECOUNTER_HPP_
00045 #define _PS_MPEG4ITEC_REFERENCECOUNTER_HPP_
00046 
00048 #include "VMutex.hpp"
00049 
00061 class ReferenceCounter
00062 {
00063 public:
00064         ReferenceCounter();
00065         virtual ~ReferenceCounter();
00066 
00068         void reset();
00069 
00071         bool increase();
00072 
00074         bool decrease();
00075 
00077         void deactivate();
00078 
00082         bool deactivateWhenUsage(unsigned int i);
00083 
00088         bool decreaseAndDeactivateWhenUsage(unsigned int i);
00089 
00090         unsigned int getUsage() const;
00091 
00092 private:
00093         void lock() const;
00094         void unlock() const;
00095 
00096 private:
00097         mutable VMutex mutex;
00098         unsigned int usageCnt;
00099         bool valid;
00100 };
00101 #endif