48 lines
1.9 KiB
C++
48 lines
1.9 KiB
C++
// 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
|