136 lines
3.0 KiB
C++
136 lines
3.0 KiB
C++
#ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_PT_HPP_INCLUDED
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#define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_PT_HPP_INCLUDED
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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# pragma once
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#endif
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//
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// detail/sp_counted_base_pt.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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//
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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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#include <boost/detail/sp_typeinfo.hpp>
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#include <pthread.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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long use_count_; // #shared
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long weak_count_; // #weak + (#shared != 0)
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mutable pthread_mutex_t m_;
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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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// HPUX 10.20 / DCE has a nonstandard pthread_mutex_init
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#if defined(__hpux) && defined(_DECTHREADS_)
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pthread_mutex_init( &m_, pthread_mutexattr_default );
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#else
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pthread_mutex_init( &m_, 0 );
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#endif
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}
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virtual ~sp_counted_base() // nothrow
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{
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pthread_mutex_destroy( &m_ );
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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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pthread_mutex_lock( &m_ );
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++use_count_;
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pthread_mutex_unlock( &m_ );
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}
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bool add_ref_lock() // true on success
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{
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pthread_mutex_lock( &m_ );
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bool r = use_count_ == 0? false: ( ++use_count_, true );
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pthread_mutex_unlock( &m_ );
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return r;
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}
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void release() // nothrow
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{
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pthread_mutex_lock( &m_ );
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long new_use_count = --use_count_;
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pthread_mutex_unlock( &m_ );
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if( new_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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pthread_mutex_lock( &m_ );
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++weak_count_;
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pthread_mutex_unlock( &m_ );
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}
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void weak_release() // nothrow
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{
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pthread_mutex_lock( &m_ );
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long new_weak_count = --weak_count_;
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pthread_mutex_unlock( &m_ );
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if( new_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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pthread_mutex_lock( &m_ );
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long r = use_count_;
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pthread_mutex_unlock( &m_ );
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return r;
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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_PT_HPP_INCLUDED
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