1 // Low-level functions for atomic operations: version for CPUs providing 2 // atomic builtins -*- C++ -*- 3 4 // Copyright (C) 2006-2018 Free Software Foundation, Inc. 5 // 6 // This file is part of the GNU ISO C++ Library. This library is free 7 // software; you can redistribute it and/or modify it under the 8 // terms of the GNU General Public License as published by the 9 // Free Software Foundation; either version 3, or (at your option) 10 // any later version. 11 12 // This library is distributed in the hope that it will be useful, 13 // but WITHOUT ANY WARRANTY; without even the implied warranty of 14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 // GNU General Public License for more details. 16 17 // Under Section 7 of GPL version 3, you are granted additional 18 // permissions described in the GCC Runtime Library Exception, version 19 // 3.1, as published by the Free Software Foundation. 20 21 // You should have received a copy of the GNU General Public License and 22 // a copy of the GCC Runtime Library Exception along with this program; 23 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 // <http://www.gnu.org/licenses/>. 25 26 #include <bits/c++config.h> 27 #include <bits/atomic_word.h> 28 29 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) 30 { 31 _GLIBCXX_BEGIN_NAMESPACE_VERSION 32 33 _Atomic_word 34 __attribute__ ((__unused__)) 35 __exchange_and_add(volatile _Atomic_word* __mem, int __val) throw () 36 { return __atomic_fetch_add(__mem, __val, __ATOMIC_ACQ_REL); } 37 38 void 39 __attribute__ ((__unused__)) 40 __atomic_add(volatile _Atomic_word* __mem, int __val) throw () 41 { __atomic_fetch_add(__mem, __val, __ATOMIC_ACQ_REL); } 42 43 _GLIBCXX_END_NAMESPACE_VERSION 44 } // namespace 45