atomic_word.h revision 1.1.1.7
1// Low-level type for atomic operations -*- C++ -*- 2 3// Copyright (C) 2004-2017 Free Software Foundation, Inc. 4// 5// This file is part of the GNU ISO C++ Library. This library is free 6// software; you can redistribute it and/or modify it under the 7// terms of the GNU General Public License as published by the 8// Free Software Foundation; either version 3, or (at your option) 9// any later version. 10 11// This library is distributed in the hope that it will be useful, 12// but WITHOUT ANY WARRANTY; without even the implied warranty of 13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14// GNU General Public License for more details. 15 16// Under Section 7 of GPL version 3, you are granted additional 17// permissions described in the GCC Runtime Library Exception, version 18// 3.1, as published by the Free Software Foundation. 19 20// You should have received a copy of the GNU General Public License and 21// a copy of the GCC Runtime Library Exception along with this program; 22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23// <http://www.gnu.org/licenses/>. 24 25#ifndef _GLIBCXX_ATOMIC_WORD_H 26#define _GLIBCXX_ATOMIC_WORD_H 1 27 28#ifdef __arch64__ 29 typedef long _Atomic_word; 30#else 31 typedef int _Atomic_word; 32#endif 33 34#if defined(__sparc_v9__) 35// These are necessary under the V9 RMO model, though it is almost never 36// used in userspace. 37#define _GLIBCXX_READ_MEM_BARRIER \ 38 __asm __volatile ("membar #LoadLoad":::"memory") 39#define _GLIBCXX_WRITE_MEM_BARRIER \ 40 __asm __volatile ("membar #StoreStore":::"memory") 41 42#elif defined(__sparc_v8__) 43// This is necessary under the PSO model. 44#define _GLIBCXX_WRITE_MEM_BARRIER __asm __volatile ("stbar":::"memory") 45 46#endif 47 48#endif 49