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sp_counted_base_acc_ia64.hpp - Hosted on DriveHQ Cloud IT Platform
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#ifndef BOOST_DETAIL_SP_COUNTED_BASE_ACC_IA64_HPP_INCLUDED #define BOOST_DETAIL_SP_COUNTED_BASE_ACC_IA64_HPP_INCLUDED // // detail/sp_counted_base_acc_ia64.hpp - aC++ on HP-UX IA64 // // Copyright 2007 Baruch Zilber // Copyright 2007 Boris Gubenko // // 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 // #include "sp_typeinfo.hpp" #include
namespace boost { namespace detail { inline void atomic_increment( int * pw ) { // ++*pw; _Asm_fetchadd(_FASZ_W, _SEM_REL, pw, +1, _LDHINT_NONE); } inline int atomic_decrement( int * pw ) { // return --*pw; int r = static_cast
(_Asm_fetchadd(_FASZ_W, _SEM_REL, pw, -1, _LDHINT_NONE)); if (1 == r) { _Asm_mf(); } return r - 1; } inline int atomic_conditional_increment( int * pw ) { // if( *pw != 0 ) ++*pw; // return *pw; int v = *pw; for (;;) { if (0 == v) { return 0; } _Asm_mov_to_ar(_AREG_CCV, v, (_UP_CALL_FENCE | _UP_SYS_FENCE | _DOWN_CALL_FENCE | _DOWN_SYS_FENCE)); int r = static_cast
(_Asm_cmpxchg(_SZ_W, _SEM_ACQ, pw, v + 1, _LDHINT_NONE)); if (r == v) { return r + 1; } v = r; } } 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_decrement( &use_count_ ) == 0 ) { dispose(); weak_release(); } } void weak_add_ref() // nothrow { atomic_increment( &weak_count_ ); } void weak_release() // nothrow { if( atomic_decrement( &weak_count_ ) == 0 ) { destroy(); } } long use_count() const // nothrow { return static_cast
( use_count_ ); // TODO use ld.acq here } }; } // namespace detail } // namespace boost #endif // #ifndef BOOST_DETAIL_SP_COUNTED_BASE_ACC_IA64_HPP_INCLUDED
sp_counted_base_acc_ia64.hpp
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