text: #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_ACC_IA64_HPP_INCLUDED
  #define BOOST_SMART_PTR_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 "boost/smart_ptr/detail/sp_typeinfo_.hpp"
  #include "boost/smart_ptr/detail/sp_obsolete.hpp"
  #include "boost/config.hpp"
  #include <machine/sys/inline.h>
  
  #if defined(BOOST_SP_REPORT_IMPLEMENTATION)
  
  #include "boost/config/pragma_message.hpp"
  BOOST_PRAGMA_MESSAGE("Using HP aCC++/HP-UX/IA64 sp_counted_base")
  
  #endif
  
  BOOST_SP_OBSOLETE()
  
  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<int>(_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<int>(_Asm_cmpxchg(_SZ_W, _SEM_ACQ, pw, v + 1, _LDHINT_NONE));
          if (r == v)
          {
              return r + 1;
          }
          
          v = r;
      }
  }
  
  class BOOST_SYMBOL_VISIBLE 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;
      virtual void * get_local_deleter( sp_typeinfo_ const & ti ) = 0;
      virtual void * get_untyped_deleter() = 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<int const volatile &>( use_count_ ); // TODO use ld.acq here
      }
  };
  
  } // namespace detail
  
  } // namespace boost
  
  #endif  // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_ACC_IA64_HPP_INCLUDED
  