| // Low-level type for atomic operations -*- C++ -*- |
| |
| // Copyright (C) 2004-2021 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/>. |
| |
| #ifndef _GLIBCXX_ATOMIC_WORD_H |
| #define _GLIBCXX_ATOMIC_WORD_H 1 |
| |
| #ifdef __arch64__ |
| typedef long _Atomic_word; |
| #else |
| typedef int _Atomic_word; |
| #endif |
| |
| #if defined(__sparc_v9__) |
| // These are necessary under the V9 RMO model, though it is almost never |
| // used in userspace. |
| #define _GLIBCXX_READ_MEM_BARRIER \ |
| __asm __volatile ("membar #LoadLoad":::"memory") |
| #define _GLIBCXX_WRITE_MEM_BARRIER \ |
| __asm __volatile ("membar #StoreStore":::"memory") |
| |
| #elif defined(__sparc_v8__) |
| // This is necessary under the PSO model. |
| #define _GLIBCXX_WRITE_MEM_BARRIER __asm __volatile ("stbar":::"memory") |
| |
| #endif |
| |
| #endif |
