1 // Low-level type for atomic operations -*- C++ -*- 2 3 // Copyright (C) 2004-2020 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