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// Low-level functions for atomic operations: x86, x >= 4 version  -*- C++ -*-

// Copyright (C) 1999, 2000, 2001, 2004, 2005, 2009 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 3, 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.

// Under Section 7 of GPL version 3, you are granted additional

// permissions described in the GCC Runtime Library Exception, version

// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and

// a copy of the GCC Runtime Library Exception along with this program;

// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

// <http://www.gnu.org/licenses/>.

#include <ext/atomicity.h>

_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)

  _Atomic_word

  __attribute__ ((__unused__))

  __exchange_and_add(volatile _Atomic_word* __mem, int __val) throw ()

  {

    register _Atomic_word __result;

    __asm__ __volatile__ ("lock; xadd{l} {%0,%1|%1,%0}"

                          : "=r" (__result), "=m" (*__mem)

                          : "0" (__val), "m" (*__mem));

    return __result;

  }

  void

  __attribute__ ((__unused__))

  __atomic_add(volatile _Atomic_word* __mem, int __val) throw ()

  {

    __asm__ __volatile__ ("lock; add{l} {%1,%0|%0,%1}"

                          : "=m" (*__mem) : "ir" (__val), "m" (*__mem));

  }

_GLIBCXX_END_NAMESPACE