Update of /cvsroot/boost/boost/boost/interprocess/smart_ptr/detail
In directory sc8-pr-cvs3.sourceforge.net:/tmp/cvs-serv25055/smart_ptr/detail
Added Files:
sp_counted_base_atomic.hpp
Log Message:
Changes for official inclusion in the regression tests
--- NEW FILE: sp_counted_base_atomic.hpp ---
#ifndef BOOST_INTERPROCESS_DETAIL_SP_COUNTED_BASE_ATOMIC_HPP_INCLUDED
#define BOOST_INTERPROCESS_DETAIL_SP_COUNTED_BASE_ATOMIC_HPP_INCLUDED
// MS compatible compilers support #pragma once
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
// Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd.
// Copyright 2004-2005 Peter Dimov
// Copyright 2007 Ion Gaztañaga
//
// 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)
//
//
// Lock-free algorithm by Alexander Terekhov
//
// Thanks to Ben Hitchings for the #weak + (#shared != 0)
// formulation
//
#include <boost/interprocess/detail/config_begin.hpp>
#include <boost/interprocess/detail/workaround.hpp>
#include <boost/interprocess/detail/atomic.hpp>
#include <typeinfo>
namespace boost {
namespace interprocess {
namespace detail {
class sp_counted_base
{
private:
sp_counted_base( sp_counted_base const & );
sp_counted_base & operator= ( sp_counted_base const & );
boost::uint32_t use_count_; // #shared
boost::uint32_t weak_count_; // #weak + (#shared != 0)
public:
sp_counted_base(): use_count_( 1 ), weak_count_( 1 )
{}
~sp_counted_base() // nothrow
{}
void add_ref_copy()
{
detail::atomic_inc32( &use_count_ );
}
bool add_ref_lock() // true on success
{
for( ;; )
{
boost::uint32_t tmp = static_cast< boost::uint32_t const volatile&
>( use_count_ );
if( tmp == 0 ) return false;
if( detail::atomic_cas32( &use_count_, tmp + 1, tmp ) == tmp )
return true;
}
}
bool ref_release() // nothrow
{ return !detail::atomic_dec32( &use_count_ ); }
void weak_add_ref() // nothrow
{ detail::atomic_inc32( &weak_count_ ); }
bool weak_release() // nothrow
{ return !detail::atomic_dec32( &weak_count_ ); }
long use_count() const // nothrow
{ return (long)static_cast<boost::uint32_t const volatile &>( use_count_ ); }
};
} // namespace detail
} // namespace interprocess
} // namespace boost
#include <boost/interprocess/detail/config_end.hpp>
#endif // #ifndef BOOST_INTERPROCESS_DETAIL_SP_COUNTED_BASE_ATOMIC_HPP_INCLUDED
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