// Low-level functions for atomic operations: Alpha version  -*- C++ -*-// Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.//// This file is part of the GNU ISO C++ Library.  This library is free// software; you can redistribute it and/or modify it under the// terms of the GNU General Public License as published by the// Free Software Foundation; either version 2, or (at your option)// any later version.// This library is distributed in the hope that it will be useful,// but WITHOUT ANY WARRANTY; without even the implied warranty of// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the// GNU General Public License for more details.// You should have received a copy of the GNU General Public License along// with this library; see the file COPYING.  If not, write to the Free// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,// USA.// As a special exception, you may use this file as part of a free software// library without restriction.  Specifically, if other files instantiate// templates or use macros or inline functions from this file, or you compile// this file and link it with other files to produce an executable, this// file does not by itself cause the resulting executable to be covered by// the GNU General Public License.  This exception does not however// invalidate any other reasons why the executable file might be covered by// the GNU General Public License.#ifndef _BITS_ATOMICITY_H#define _BITS_ATOMICITY_H	1/* @@@ With gas we can play nice .subsection games to get the   non-predicted branch pointing forward.  But Digital assemblers   don't understand those directives.  This isn't a terribly   important issue, so just ignore it.  */typedef int _Atomic_word;static inline _Atomic_word__attribute__ ((__unused__))__exchange_and_add (volatile _Atomic_word* __mem, int __val){  register int __result, __tmp;  __asm__ __volatile__ (      "\n$Lxadd_%=:\n\t"      "ldl_l  %0,%3\n\t"      "addl   %0,%4,%1\n\t"      "stl_c  %1,%2\n\t"      "beq    %1,$Lxadd_%=\n\t"      "mb"      : "=&r"(__result), "=&r"(__tmp), "=m"(*__mem)      : "m" (*__mem), "r"(__val));  return __result;}static inline void__attribute__ ((__unused__))__atomic_add (volatile _Atomic_word* __mem, int __val){  register _Atomic_word __result;  __asm__ __volatile__ (      "\n$Ladd_%=:\n\t"      "ldl_l  %0,%2\n\t"      "addl   %0,%3,%0\n\t"      "stl_c  %0,%1\n\t"      "beq    %0,$Ladd_%=\n\t"      "mb"      : "=&r"(__result), "=m"(*__mem)      : "m" (*__mem), "r"(__val));}#endif /* atomicity.h */