1 // Low-level functions for atomic operations: sh version -*- C++ -*- 2 3 // Copyright (C) 1999-2018 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