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// Low-level type for atomic operations -*- C++ -*-

// Copyright (C) 2004, 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/>.

/** @file atomic_word.h

 *  This file is a GNU extension to the Standard C++ Library.

 */

#ifndef _GLIBCXX_ATOMIC_WORD_H

#define _GLIBCXX_ATOMIC_WORD_H  1

typedef int _Atomic_word;

// Define these two macros using the appropriate memory barrier for the target.

// The commented out versions below are the defaults.

// See ia64/atomic_word.h for an alternative approach.

// This one prevents loads from being hoisted across the barrier;

// in other words, this is a Load-Load acquire barrier.

// This is necessary iff TARGET_RELAXED_ORDERING is defined in tm.h.  

// #define _GLIBCXX_READ_MEM_BARRIER __asm __volatile ("":::"memory")

// This one prevents stores from being sunk across the barrier; in other

// words, a Store-Store release barrier.

// #define _GLIBCXX_WRITE_MEM_BARRIER __asm __volatile ("":::"memory")

#endif