author | Alex Gilkes <alex.gilkes@nokia.com> |
Tue, 27 Oct 2009 16:36:35 +0000 | |
changeset 0 | 044383f39525 |
permissions | -rw-r--r-- |
0
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#ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_GCC_X86_HPP_INCLUDED |
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#define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_GCC_X86_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_gcc_x86.hpp - g++ on 486+ or AMD64 |
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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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// |
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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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namespace boost |
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{ |
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namespace detail |
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{ |
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inline int atomic_exchange_and_add( int * pw, int dv ) |
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{ |
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// int r = *pw; |
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// *pw += dv; |
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// return r; |
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int r; |
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__asm__ __volatile__ |
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( |
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"lock\n\t" |
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"xadd %1, %0": |
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"=m"( *pw ), "=r"( r ): // outputs (%0, %1) |
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"m"( *pw ), "1"( dv ): // inputs (%2, %3 == %1) |
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"memory", "cc" // clobbers |
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); |
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return r; |
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} |
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inline void atomic_increment( int * pw ) |
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{ |
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//atomic_exchange_and_add( pw, 1 ); |
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__asm__ |
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( |
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"lock\n\t" |
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"incl %0": |
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"=m"( *pw ): // output (%0) |
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"m"( *pw ): // input (%1) |
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"cc" // clobbers |
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); |
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} |
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inline int atomic_conditional_increment( int * pw ) |
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{ |
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// int rv = *pw; |
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// if( rv != 0 ) ++*pw; |
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// return rv; |
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int rv, tmp; |
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__asm__ |
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( |
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"movl %0, %%eax\n\t" |
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"0:\n\t" |
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"test %%eax, %%eax\n\t" |
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"je 1f\n\t" |
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"movl %%eax, %2\n\t" |
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"incl %2\n\t" |
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"lock\n\t" |
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"cmpxchgl %2, %0\n\t" |
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"jne 0b\n\t" |
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"1:": |
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"=m"( *pw ), "=&a"( rv ), "=&r"( tmp ): // outputs (%0, %1, %2) |
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"m"( *pw ): // input (%3) |
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"cc" // clobbers |
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); |
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return rv; |
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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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int use_count_; // #shared |
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int 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_increment( &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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return atomic_conditional_increment( &use_count_ ) != 0; |
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} |
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void release() // nothrow |
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{ |
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if( atomic_exchange_and_add( &use_count_, -1 ) == 1 ) |
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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_increment( &weak_count_ ); |
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} |
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void weak_release() // nothrow |
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{ |
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if( atomic_exchange_and_add( &weak_count_, -1 ) == 1 ) |
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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<int 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_GCC_X86_HPP_INCLUDED |