1// Low-level functions for atomic operations: sh version -*- C++ -*- 2 3// Copyright (C) 1999-2020 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// Use the default atomicity stuff, which will use __atomic* builtins 26// if threads are available, or the *_single functions on single-thread 27// configurations. 28// Actually we wouldn't need this header at all, but because of PR 53579 29// libstdc++'s configury will not pickup the -matomic-model= option when 30// set in the environment. This makes it impossible to enable the proper 31// atomic model on SH without modifying GCC itself, because libstdc++ always 32// thinks the target doesn't do any atomics and uses the default mutex based 33// implementation from cpu/generic/atomicity_mutex. 34 35#include <ext/atomicity.h> 36