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csevcord.h

00001 /*
00002     Copyright (C) 2000 by Jorrit Tyberghein
00003     Written by Michael Dale Long.
00004 
00005     This library is free software; you can redistribute it and/or
00006     modify it under the terms of the GNU Library General Public
00007     License as published by the Free Software Foundation; either
00008     version 2 of the License, or (at your option) any later version.
00009 
00010     This library is distributed in the hope that it will be useful,
00011     but WITHOUT ANY WARRANTY; without even the implied warranty of
00012     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013     Library General Public License for more details.
00014 
00015     You should have received a copy of the GNU Library General Public
00016     License along with this library; if not, write to the Free
00017     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00018 */
00019 
00020 #ifndef __CS_CSEVCORD_H__
00021 #define __CS_CSEVCORD_H__
00022 
00023 #include "csextern.h"
00024 #include "csutil/scf.h"
00025 #include "iutil/event.h"
00026 
00027 struct iEventHandler;
00028 
00029 class csEventOutlet;
00030 
00034 class CS_CRYSTALSPACE_EXPORT csEventCord : public iEventCord
00035 {
00036 protected:
00038   volatile bool pass;
00039 
00041   int category, subcategory;
00042 
00046   struct PluginData
00047   {
00048     iEventHandler *plugin;
00049     int priority;
00050     PluginData *next;
00051   };
00052 
00054   PluginData *plugins;
00055 
00057   volatile int SpinLock;
00058 
00060   inline void Lock() { while (SpinLock) {} SpinLock++; }
00062   inline void Unlock() { SpinLock--; }
00063 
00065   friend class csEventOutlet;
00066   bool Post(iEvent*);
00067 
00068 public:
00069   SCF_DECLARE_IBASE;
00070 
00072   csEventCord(int category, int subcategory);
00073 
00075   virtual ~csEventCord();
00076 
00078   virtual int Insert(iEventHandler*, int priority);
00079 
00081   virtual void Remove(iEventHandler*);
00082 
00084   virtual bool GetPass() const { return pass; }
00085 
00087   virtual void SetPass(bool flag) { pass = flag; }
00088 
00090   virtual int GetCategory() const { return category; }
00091 
00093   virtual int GetSubcategory() const { return subcategory; }
00094 };
00095 
00096 #endif // __CS_CSEVCORD_H__

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