// Low-level functions for atomic operations. MIPS II version.// 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 1// #include <sgidefs.h>// #ifdef (_MIPS_ISA_MIPS2)typedef int _Atomic_word;static inline int__attribute__ ((unused))__exchange_and_add (volatile _Atomic_word *__mem, int __val){  int __result, __tmp;  __asm__ __volatile__    ("/* Inline exchange & add */\n\t"     "1:\n\t"     "ll	%0,%3\n\t"     "addu	%1,%4,%0\n\t"     "sc	%1,%2\n\t"     "beqz	%1,1b\n\t"     "/* End exchange & add */"     : "=&r"(__result), "=&r"(__tmp), "=m"(*__mem)     : "m" (*__mem), "r"(__val)     : "memory");  return __result;}static inline void__attribute__ ((unused))__atomic_add (volatile _Atomic_word *__mem, int __val){  int __result;  __asm__ __volatile__    ("/* Inline atomic add */\n\t"     "1:\n\t"     "ll	%0,%2\n\t"     "addu	%0,%3,%0\n\t"     "sc	%0,%1\n\t"     "beqz	%0,1b\n\t"     "/* End atomic add */"     : "=&r"(__result), "=m"(*__mem)     : "m" (*__mem), "r"(__val)     : "memory");}#endif /* atomicity.h */