author | Alex Gilkes <alex.gilkes@nokia.com> |
Tue, 27 Oct 2009 16:36:35 +0000 | |
changeset 0 | 044383f39525 |
permissions | -rw-r--r-- |
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#ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SOLARIS_HPP_INCLUDED |
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#define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SOLARIS_HPP_INCLUDED |
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// |
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// detail/sp_counted_base_solaris.hpp |
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// based on: detail/sp_counted_base_w32.hpp |
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// |
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// Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd. |
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// Copyright 2004-2005 Peter Dimov |
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// Copyright 2006 Michael van der Westhuizen |
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// |
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// Distributed under the Boost Software License, Version 1.0. (See |
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// accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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// |
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// |
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// Lock-free algorithm by Alexander Terekhov |
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// |
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// Thanks to Ben Hitchings for the #weak + (#shared != 0) |
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// formulation |
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// |
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#include <boost/detail/sp_typeinfo.hpp> |
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#include <atomic.h> |
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namespace boost |
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{ |
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namespace detail |
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{ |
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class sp_counted_base |
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{ |
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private: |
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sp_counted_base( sp_counted_base const & ); |
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sp_counted_base & operator= ( sp_counted_base const & ); |
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uint32_t use_count_; // #shared |
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uint32_t weak_count_; // #weak + (#shared != 0) |
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public: |
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sp_counted_base(): use_count_( 1 ), weak_count_( 1 ) |
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{ |
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} |
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virtual ~sp_counted_base() // nothrow |
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{ |
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} |
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// dispose() is called when use_count_ drops to zero, to release |
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// the resources managed by *this. |
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virtual void dispose() = 0; // nothrow |
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// destroy() is called when weak_count_ drops to zero. |
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virtual void destroy() // nothrow |
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{ |
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delete this; |
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} |
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virtual void * get_deleter( sp_typeinfo const & ti ) = 0; |
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void add_ref_copy() |
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{ |
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atomic_inc_32( &use_count_ ); |
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} |
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bool add_ref_lock() // true on success |
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{ |
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for( ;; ) |
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{ |
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uint32_t tmp = static_cast< uint32_t const volatile& >( use_count_ ); |
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if( tmp == 0 ) return false; |
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if( atomic_cas_32( &use_count_, tmp, tmp + 1 ) == tmp ) return true; |
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} |
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} |
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void release() // nothrow |
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{ |
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if( atomic_dec_32_nv( &use_count_ ) == 0 ) |
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{ |
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dispose(); |
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weak_release(); |
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} |
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} |
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void weak_add_ref() // nothrow |
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{ |
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atomic_inc_32( &weak_count_ ); |
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} |
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void weak_release() // nothrow |
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{ |
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if( atomic_dec_32_nv( &weak_count_ ) == 0 ) |
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{ |
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destroy(); |
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} |
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} |
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long use_count() const // nothrow |
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{ |
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return static_cast<long const volatile &>( use_count_ ); |
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} |
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}; |
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} // namespace detail |
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} // namespace boost |
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#endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SOLARIS_HPP_INCLUDED |