// Low-level functions for atomic operations: S/390 version  -*- C++ -*-// Copyright (C) 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	1typedef int _Atomic_word;static inline _Atomic_word __attribute__ ((__unused__))__exchange_and_add (volatile _Atomic_word *__mem, int __val){  register _Atomic_word __old_val, __new_val;  __asm__ __volatile__ ("   l     %0,0(%2)\n"                        "0: lr    %1,%0\n"                        "   ar    %1,%3\n"                        "   cs    %0,%1,0(%2)\n"                        "   jl    0b"                        : "=&d" (__old_val), "=&d" (__new_val)                        : "a" (__mem), "d" (__val) : "cc", "memory" );  return __old_val;}static inline void__attribute__ ((__unused__))__atomic_add (volatile _Atomic_word *__mem, int __val){  __exchange_and_add (__mem, __val);}#endif /* atomicity.h */