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sp_counted_base_cw_x86.hpp - Hosted on DriveHQ Cloud IT Platform
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路径: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\detail\sp_counted_base_cw_x86.hpp
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#ifndef BOOST_DETAIL_SP_COUNTED_BASE_CW_X86_HPP_INCLUDED #define BOOST_DETAIL_SP_COUNTED_BASE_CW_X86_HPP_INCLUDED // MS compatible compilers support #pragma once #if defined(_MSC_VER) && (_MSC_VER >= 1020) # pragma once #endif // // detail/sp_counted_base_cw_x86.hpp - CodeWarrion on 486+ // // Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd. // Copyright 2004-2005 Peter Dimov // Copyright 2005 Rene Rivera // // 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 "sp_typeinfo.hpp" namespace boost { namespace detail { inline int atomic_exchange_and_add( int * pw, int dv ) { // int r = *pw; // *pw += dv; // return r; asm { mov esi, [pw] mov eax, dv lock xadd dword ptr [esi], eax } } inline void atomic_increment( int * pw ) { //atomic_exchange_and_add( pw, 1 ); asm { mov esi, [pw] lock inc dword ptr [esi] } } inline int atomic_conditional_increment( int * pw ) { // int rv = *pw; // if( rv != 0 ) ++*pw; // return rv; asm { mov esi, [pw] mov eax, dword ptr [esi] L0: test eax, eax je L1 mov ebx, eax inc ebx lock cmpxchg dword ptr [esi], ebx jne L0 L1: } } class sp_counted_base { private: sp_counted_base( sp_counted_base const & ); sp_counted_base & operator= ( sp_counted_base const & ); int use_count_; // #shared int weak_count_; // #weak + (#shared != 0) public: sp_counted_base(): use_count_( 1 ), weak_count_( 1 ) { } virtual ~sp_counted_base() // nothrow { } // 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; void add_ref_copy() { atomic_increment( &use_count_ ); } bool add_ref_lock() // true on success { return atomic_conditional_increment( &use_count_ ) != 0; } void release() // nothrow { if( atomic_exchange_and_add( &use_count_, -1 ) == 1 ) { dispose(); weak_release(); } } void weak_add_ref() // nothrow { atomic_increment( &weak_count_ ); } void weak_release() // nothrow { if( atomic_exchange_and_add( &weak_count_, -1 ) == 1 ) { destroy(); } } long use_count() const // nothrow { return static_cast
( use_count_ ); } }; } // namespace detail } // namespace boost #endif // #ifndef BOOST_DETAIL_SP_COUNTED_BASE_GCC_X86_HPP_INCLUDED
sp_counted_base_cw_x86.hpp
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