1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/epoc32/include/stdapis/boost/detail/sp_counted_base_w32.hpp	Tue Mar 16 16:12:26 2010 +0000
     1.3 @@ -0,0 +1,130 @@
     1.4 +#ifndef BOOST_DETAIL_SP_COUNTED_BASE_W32_HPP_INCLUDED
     1.5 +#define BOOST_DETAIL_SP_COUNTED_BASE_W32_HPP_INCLUDED
     1.6 +
     1.7 +// MS compatible compilers support #pragma once
     1.8 +
     1.9 +#if defined(_MSC_VER) && (_MSC_VER >= 1020)
    1.10 +# pragma once
    1.11 +#endif
    1.12 +
    1.13 +//
    1.14 +//  detail/sp_counted_base_w32.hpp
    1.15 +//
    1.16 +//  Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd.
    1.17 +//  Copyright 2004-2005 Peter Dimov
    1.18 +//
    1.19 +//  Distributed under the Boost Software License, Version 1.0. (See
    1.20 +//  accompanying file LICENSE_1_0.txt or copy at
    1.21 +//  http://www.boost.org/LICENSE_1_0.txt)
    1.22 +//
    1.23 +//
    1.24 +//  Lock-free algorithm by Alexander Terekhov
    1.25 +//
    1.26 +//  Thanks to Ben Hitchings for the #weak + (#shared != 0)
    1.27 +//  formulation
    1.28 +//
    1.29 +
    1.30 +#include <boost/detail/interlocked.hpp>
    1.31 +#include <boost/detail/workaround.hpp>
    1.32 +#include <typeinfo>
    1.33 +
    1.34 +namespace boost
    1.35 +{
    1.36 +
    1.37 +namespace detail
    1.38 +{
    1.39 +
    1.40 +class sp_counted_base
    1.41 +{
    1.42 +private:
    1.43 +
    1.44 +    sp_counted_base( sp_counted_base const & );
    1.45 +    sp_counted_base & operator= ( sp_counted_base const & );
    1.46 +
    1.47 +    long use_count_;        // #shared
    1.48 +    long weak_count_;       // #weak + (#shared != 0)
    1.49 +
    1.50 +public:
    1.51 +
    1.52 +    sp_counted_base(): use_count_( 1 ), weak_count_( 1 )
    1.53 +    {
    1.54 +    }
    1.55 +
    1.56 +    virtual ~sp_counted_base() // nothrow
    1.57 +    {
    1.58 +    }
    1.59 +
    1.60 +    // dispose() is called when use_count_ drops to zero, to release
    1.61 +    // the resources managed by *this.
    1.62 +
    1.63 +    virtual void dispose() = 0; // nothrow
    1.64 +
    1.65 +    // destroy() is called when weak_count_ drops to zero.
    1.66 +
    1.67 +    virtual void destroy() // nothrow
    1.68 +    {
    1.69 +        delete this;
    1.70 +    }
    1.71 +
    1.72 +    virtual void * get_deleter( std::type_info const & ti ) = 0;
    1.73 +
    1.74 +    void add_ref_copy()
    1.75 +    {
    1.76 +        BOOST_INTERLOCKED_INCREMENT( &use_count_ );
    1.77 +    }
    1.78 +
    1.79 +    bool add_ref_lock() // true on success
    1.80 +    {
    1.81 +        for( ;; )
    1.82 +        {
    1.83 +            long tmp = static_cast< long const volatile& >( use_count_ );
    1.84 +            if( tmp == 0 ) return false;
    1.85 +
    1.86 +#if defined( BOOST_MSVC ) && BOOST_WORKAROUND( BOOST_MSVC, == 1200 )
    1.87 +
    1.88 +            // work around a code generation bug
    1.89 +
    1.90 +            long tmp2 = tmp + 1;
    1.91 +            if( BOOST_INTERLOCKED_COMPARE_EXCHANGE( &use_count_, tmp2, tmp ) == tmp2 - 1 ) return true;
    1.92 +
    1.93 +#else
    1.94 +
    1.95 +            if( BOOST_INTERLOCKED_COMPARE_EXCHANGE( &use_count_, tmp + 1, tmp ) == tmp ) return true;
    1.96 +
    1.97 +#endif
    1.98 +        }
    1.99 +    }
   1.100 +
   1.101 +    void release() // nothrow
   1.102 +    {
   1.103 +        if( BOOST_INTERLOCKED_DECREMENT( &use_count_ ) == 0 )
   1.104 +        {
   1.105 +            dispose();
   1.106 +            weak_release();
   1.107 +        }
   1.108 +    }
   1.109 +
   1.110 +    void weak_add_ref() // nothrow
   1.111 +    {
   1.112 +        BOOST_INTERLOCKED_INCREMENT( &weak_count_ );
   1.113 +    }
   1.114 +
   1.115 +    void weak_release() // nothrow
   1.116 +    {
   1.117 +        if( BOOST_INTERLOCKED_DECREMENT( &weak_count_ ) == 0 )
   1.118 +        {
   1.119 +            destroy();
   1.120 +        }
   1.121 +    }
   1.122 +
   1.123 +    long use_count() const // nothrow
   1.124 +    {
   1.125 +        return static_cast<long const volatile &>( use_count_ );
   1.126 +    }
   1.127 +};
   1.128 +
   1.129 +} // namespace detail
   1.130 +
   1.131 +} // namespace boost
   1.132 +
   1.133 +#endif  // #ifndef BOOST_DETAIL_SP_COUNTED_BASE_W32_HPP_INCLUDED