version 1.2, 2001/04/25 22:20:56
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version 1.17, 2005/10/24 19:35:25
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//%///////////////////////////////////////////////////////////////////////////// |
//%2005//////////////////////////////////////////////////////////////////////// |
// |
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// Copyright (c) 2000 The Open Group, BMC Software, Tivoli Systems, IBM |
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// | // |
// Permission is hereby granted, free of charge, to any person obtaining a |
// Copyright (c) 2000, 2001, 2002 BMC Software; Hewlett-Packard Development |
// copy of this software and associated documentation files (the "Software"), |
// Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems. |
// to deal in the Software without restriction, including without limitation |
// Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.; |
// the rights to use, copy, modify, merge, publish, distribute, sublicense, |
// IBM Corp.; EMC Corporation, The Open Group. |
// and/or sell copies of the Software, and to permit persons to whom the |
// Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.; |
// Software is furnished to do so, subject to the following conditions: |
// IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group. |
// |
// Copyright (c) 2005 Hewlett-Packard Development Company, L.P.; IBM Corp.; |
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
// EMC Corporation; VERITAS Software Corporation; The Open Group. |
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
// |
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
// Permission is hereby granted, free of charge, to any person obtaining a copy |
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
// of this software and associated documentation files (the "Software"), to |
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
// deal in the Software without restriction, including without limitation the |
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
// DEALINGS IN THE SOFTWARE. |
// sell copies of the Software, and to permit persons to whom the Software is |
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// furnished to do so, subject to the following conditions: |
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// |
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// THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN |
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// ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED |
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// "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT |
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// LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR |
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT |
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// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
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// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
// | // |
//============================================================================== | //============================================================================== |
// | // |
// Author: Mike Brasher (mbrasher@bmc.com) | // Author: Mike Brasher (mbrasher@bmc.com) |
// | // |
// Modified By: |
// Modified By: Roger Kumpf, Hewlett-Packard Company (roger_kumpf@hp.com) |
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// David Eger (dteger@us.ibm.com) |
// | // |
//%///////////////////////////////////////////////////////////////////////////// | //%///////////////////////////////////////////////////////////////////////////// |
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//////////////////////////////////////////////////////////////////////////////// |
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// |
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// Sharable.h |
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// |
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// The Sharable class implements a simple reference counting scheme. |
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// The static Inc() method increments the reference count member. |
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// The static Dec() method decrements the reference count and deletes |
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// the object when the reference count becomes zero. |
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// |
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// Other classes may inherit this reference counting behavior simply |
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// by deriving from this class. |
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// |
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//////////////////////////////////////////////////////////////////////////////// |
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#ifndef Pegasus_Sharable_h | #ifndef Pegasus_Sharable_h |
#define Pegasus_Sharable_h | #define Pegasus_Sharable_h |
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#include <Pegasus/Common/Config.h> | #include <Pegasus/Common/Config.h> |
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#include <Pegasus/Common/Linkage.h> |
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#include <Pegasus/Common/IPC.h> |
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#include <assert.h> |
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PEGASUS_NAMESPACE_BEGIN | PEGASUS_NAMESPACE_BEGIN |
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/** |
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The Sharable class implements a simple reference counting scheme. |
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The static Inc() method increments the reference count member. |
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The static Dec() method decrements the reference count and deletes |
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the object when the reference count becomes zero. |
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Other classes may inherit this reference counting behavior simply |
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by deriving from this class. |
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*/ |
class PEGASUS_COMMON_LINKAGE Sharable | class PEGASUS_COMMON_LINKAGE Sharable |
{ | { |
public: | public: |
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Sharable() : _ref(1) { } | Sharable() : _ref(1) { } |
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virtual ~Sharable(); | virtual ~Sharable(); |
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Uint32 getRef() const { return _ref.get(); } |
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Uint32 getRef() const { return _ref; } |
friend void Inc(Sharable* sharable); |
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friend void Inc(const Sharable* sharable); |
friend void Dec(Sharable* sharable); |
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friend void Dec(const Sharable* sharable); |
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private: | private: |
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Sharable(const Sharable &s) : _ref(1) {assert(0);} |
Uint32 _ref; |
// we should never copy a counter, so we make this private - dte |
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AtomicInt _ref; |
}; | }; |
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inline void Inc(const Sharable* x) |
inline void Inc(Sharable* x) |
{ | { |
if (x) | if (x) |
((Sharable*)x)->_ref++; |
{ |
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// A sharable object should never be incremented from zero. |
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// If so, there is a double delete being cause by impropoer use |
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// of sharable assignment or copy constructors somewhere |
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// << Wed Nov 6 12:46:52 2002 mdd >> |
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assert(((Sharable*)x)->_ref.get()); |
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x->_ref++; |
} | } |
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inline void Dec(const Sharable* x) |
} |
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inline void Dec(Sharable* x) |
{ | { |
if (x && --((Sharable*)x)->_ref == 0) |
if (x && x->_ref.decAndTestIfZero()) |
delete (Sharable*)x; |
delete x; |
} | } |
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PEGASUS_NAMESPACE_END | PEGASUS_NAMESPACE_END |