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#ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_GCC_X86_HPP_INCLUDED #define BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_GCC_X86_HPP_INCLUDED // // boost/detail/atomic_count_gcc_x86.hpp // // atomic_count for g++ on 486+/AMD64 // // Copyright 2007 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/smart_ptr/detail/sp_obsolete.hpp> #if defined(BOOST_SP_REPORT_IMPLEMENTATION) #include <boost/config/pragma_message.hpp> BOOST_PRAGMA_MESSAGE("Using g++/x86 atomic_count") #endif BOOST_SP_OBSOLETE() namespace boost { namespace detail { class atomic_count { public: explicit atomic_count( long v ) : value_( static_cast< int >( v ) ) {} long operator++() { return atomic_exchange_and_add( &value_, +1 ) + 1; } long operator--() { return atomic_exchange_and_add( &value_, -1 ) - 1; } operator long() const { return atomic_exchange_and_add( &value_, 0 ); } private: atomic_count(atomic_count const &); atomic_count & operator=(atomic_count const &); mutable int value_; private: static int atomic_exchange_and_add( int * pw, int dv ) { // int r = *pw; // *pw += dv; // return r; int r; __asm__ __volatile__ ( "lock\n\t" "xadd %1, %0": "+m"( *pw ), "=r"( r ): // outputs (%0, %1) "1"( dv ): // inputs (%2 == %1) "memory", "cc" // clobbers ); return r; } }; } // namespace detail } // namespace boost #endif // #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_GCC_X86_HPP_INCLUDED
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