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#ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_PT_HPP_INCLUDED
#define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_PT_HPP_INCLUDED
// MS compatible compilers support #pragma once
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
//
// detail/sp_counted_base_pt.hpp
//
// Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd.
// Copyright 2004-2005 Peter Dimov
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
#include <boost/detail/sp_typeinfo.hpp>
#include <boost/assert.hpp>
#include <pthread.h>
namespace boost
{
namespace detail
{
class sp_counted_base
{
private:
sp_counted_base( sp_counted_base const & );
sp_counted_base & operator= ( sp_counted_base const & );
long use_count_; // #shared
long weak_count_; // #weak + (#shared != 0)
mutable pthread_mutex_t m_;
public:
sp_counted_base(): use_count_( 1 ), weak_count_( 1 )
{
// HPUX 10.20 / DCE has a nonstandard pthread_mutex_init
#if defined(__hpux) && defined(_DECTHREADS_)
BOOST_VERIFY( pthread_mutex_init( &m_, pthread_mutexattr_default ) == 0 );
#else
BOOST_VERIFY( pthread_mutex_init( &m_, 0 ) == 0 );
#endif
}
virtual ~sp_counted_base() // nothrow
{
BOOST_VERIFY( pthread_mutex_destroy( &m_ ) == 0 );
}
// dispose() is called when use_count_ drops to zero, to release
// the resources managed by *this.
virtual void dispose() = 0; // nothrow
// destroy() is called when weak_count_ drops to zero.
virtual void destroy() // nothrow
{
delete this;
}
virtual void * get_deleter( sp_typeinfo const & ti ) = 0;
virtual void * get_untyped_deleter() = 0;
void add_ref_copy()
{
BOOST_VERIFY( pthread_mutex_lock( &m_ ) == 0 );
++use_count_;
BOOST_VERIFY( pthread_mutex_unlock( &m_ ) == 0 );
}
bool add_ref_lock() // true on success
{
BOOST_VERIFY( pthread_mutex_lock( &m_ ) == 0 );
bool r = use_count_ == 0? false: ( ++use_count_, true );
BOOST_VERIFY( pthread_mutex_unlock( &m_ ) == 0 );
return r;
}
void release() // nothrow
{
BOOST_VERIFY( pthread_mutex_lock( &m_ ) == 0 );
long new_use_count = --use_count_;
BOOST_VERIFY( pthread_mutex_unlock( &m_ ) == 0 );
if( new_use_count == 0 )
{
dispose();
weak_release();
}
}
void weak_add_ref() // nothrow
{
BOOST_VERIFY( pthread_mutex_lock( &m_ ) == 0 );
++weak_count_;
BOOST_VERIFY( pthread_mutex_unlock( &m_ ) == 0 );
}
void weak_release() // nothrow
{
BOOST_VERIFY( pthread_mutex_lock( &m_ ) == 0 );
long new_weak_count = --weak_count_;
BOOST_VERIFY( pthread_mutex_unlock( &m_ ) == 0 );
if( new_weak_count == 0 )
{
destroy();
}
}
long use_count() const // nothrow
{
BOOST_VERIFY( pthread_mutex_lock( &m_ ) == 0 );
long r = use_count_;
BOOST_VERIFY( pthread_mutex_unlock( &m_ ) == 0 );
return r;
}
};
} // namespace detail
} // namespace boost
#endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_PT_HPP_INCLUDED