1 karl  1.20 //%2006////////////////////////////////////////////////////////////////////////

 2 mike  1.6  //

 3 karl  1.15 // Copyright (c) 2000, 2001, 2002 BMC Software; Hewlett-Packard Development
 4            // Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems.
 5            // Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.;

 6 karl  1.14 // IBM Corp.; EMC Corporation, The Open Group.

 7 karl  1.15 // Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.;
 8            // IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group.

 9 karl  1.16 // Copyright (c) 2005 Hewlett-Packard Development Company, L.P.; IBM Corp.;
10            // EMC Corporation; VERITAS Software Corporation; The Open Group.

11 karl  1.20 // Copyright (c) 2006 Hewlett-Packard Development Company, L.P.; IBM Corp.;
12            // EMC Corporation; Symantec Corporation; The Open Group.

13 mike  1.6  //
14            // Permission is hereby granted, free of charge, to any person obtaining a copy

15 kumpf 1.7  // of this software and associated documentation files (the "Software"), to
16            // deal in the Software without restriction, including without limitation the
17            // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or

18 mike  1.6  // sell copies of the Software, and to permit persons to whom the Software is
19            // furnished to do so, subject to the following conditions:
20            // 

21 kumpf 1.7  // THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN

22 mike  1.6  // ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED
23            // "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT

24 kumpf 1.7  // LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
25            // PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
26            // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN

27 mike  1.6  // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
28            // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
29            //
30            //==============================================================================
31            //
32            //%/////////////////////////////////////////////////////////////////////////////
33            
34            #ifndef Pegasus_Sharable_h
35            #define Pegasus_Sharable_h
36            
37            #include <Pegasus/Common/Config.h>

38 kumpf 1.8  #include <Pegasus/Common/Linkage.h>

39 jim.wunderlich 1.19 #include <Pegasus/Common/PegasusAssert.h>

40 mike           1.22 #include <Pegasus/Common/AtomicInt.h>

41 mike           1.6  
42                     PEGASUS_NAMESPACE_BEGIN
43                     

44 kumpf          1.23 /**
45                         The Sharable class implements a simple reference counting scheme.
46                         The static Inc() method increments the reference count member.

47 mike           1.6      The static Dec() method decrements the reference count and deletes
48                         the object when the reference count becomes zero.
49                     
50                         Other classes may inherit this reference counting behavior simply
51                         by deriving from this class.
52                     */
53                     class PEGASUS_COMMON_LINKAGE Sharable
54                     {
55                     public:
56                     
57                         Sharable() : _ref(1) { }
58                     
59                         virtual ~Sharable();
60                     

61 kumpf          1.23     friend void Inc(Sharable* sharable);

62 mike           1.6  

63 david.eger     1.12     friend void Dec(Sharable* sharable);

64 mike           1.6  
65                     private:

66 kumpf          1.21     Sharable(const Sharable &s);
67                         Sharable& operator=(const Sharable &s);
68                     

69 mday           1.13     AtomicInt _ref;

70 mike           1.6  };
71                     

72 david.eger     1.12 inline void Inc(Sharable* x)

73 mike           1.6  {

74 mike           1.18     if (x)

75 mday           1.11     {

76 kumpf          1.23         // A sharable object should never be incremented from zero.
77                             PEGASUS_DEBUG_ASSERT(x->_ref.get());
78                             x->_ref++;

79 mday           1.11     }

80 mike           1.6  }
81                     

82 david.eger     1.12 inline void Dec(Sharable* x)

83 mike           1.6  {

84 mike           1.17   if (x && x->_ref.decAndTestIfZero())

85 david.eger     1.12     delete x;

86 mike           1.6  }
87                     
88                     PEGASUS_NAMESPACE_END
89                     
90                     #endif /* Pegasus_Sharable_h */