mxmSmartHandleCore.h

00001 //           ///          //                                  C++ Cross Platform
00002 //          /////        ////
00003 //         /// XXX     XXX ///            ///////////   /////////     ///   ///
00004 //        ///    XXX XXX    ///         ///             ///    ///   ///  ///
00005 //       ///       XXX       ///         /////////     ///      //  //////
00006 //      ///      XXX XXX      ///               ///   ///    ///   ///  ///
00007 //     ////    XXX     XXX    ////    ////////////  //////////    ///   ///
00008 //    ////                     ////
00009 //   ////  M  O  B  O  T  I  X  ////////////////////////////////////////////////
00010 //  //// Security Vision Systems //////////////////////////////////////////////
00011 //
00012 //  $Author: khe_admin $
00013 //  $LastChangedBy: khe_admin $
00014 //  $LastChangedDate: 2007-06-29 12:31:37 +0200 (Fri, 29 Jun 2007) $
00015 //  $HeadURL: http://svn.mobotix.net/svn/mxsdk/src/mxm/trunk/include/mxm/core/mxmSmartHandleCore.h $
00016 //
00018      //
00019      //  MOBOTIX MxPEG SDK
00020      //
00021      //  This file belongs to the C++ library released as part of the MxPEG SDK.
00022      //
00023      //  This software is licenced under the BSD licence,
00024      //  http://www.opensource.org/licenses/bsd-license.php
00025      //
00026      //  Copyright (c) 2005 - 2007, MOBOTIX AG
00027      //  All rights reserved.
00028      //
00029      //  Redistribution and use in source and binary forms, with or without
00030      //  modification, are permitted provided that the following conditions are
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00033      //  - Redistributions of source code must retain the above copyright
00034      //    notice, this list of conditions and the following disclaimer.
00035      //
00036      //  - Redistributions in binary form must reproduce the above copyright
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00041      //    be used to endorse or promote products derived from this software
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00057 
00058 
00059 
00060 #ifndef __MXM_SMARTHANDLECORE_H__
00061 #define __MXM_SMARTHANDLECORE_H__
00062 
00063 
00064 
00065 #include <mxm/core/mxmObject.h>
00066 #include <mxm/core/mxm_types.h>
00067 
00068 
00069 
00070 class mxmLockInterface;
00071 namespace mxm {
00072   template<class T> class smart;
00073 }
00074 
00075 
00076 
00079 
00084 class MXM_CORE_API mxmSmartHandleCore : public mxmObject {
00085   
00086  private:
00087   template<class T> friend class mxm::smart;        // we're closely related :-)
00088   
00089  private:
00090   mxmSmartHandleCore *Prev,
00091                      *Next;
00092   void               *Handlee;
00093   mxmLockInterface   *Lock;
00094   mxm::u32           OwnedLock:1;   // only valid if lock attached
00095   mxm::u32           Reserved:31;
00096   
00097  private:
00099   mxmSmartHandleCore();
00101   void init();
00102   virtual ~mxmSmartHandleCore();
00104   virtual void deleteHandlee() = 0;
00105   
00106  public:
00109   bool operator!(void) const;
00112   bool null(void) const;
00115   int groupSize() const;
00119   void setLock(mxmLockInterface *lock, bool assume_ownership = false);
00122   bool releaseSmartlyHandledObject(void);
00123   
00124  private:
00127   void reset();
00130   void joinGroup(const mxmSmartHandleCore &other,
00131                  void *handlee_override = 0,
00132                  bool lock_already_acquired = false);
00133 };
00134 
00135 
00136 
00137 #endif   // __MXM_SMARTHANDLECORE_H__

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