1// { dg-options "-std=gnu++11" } 2// { dg-require-thread-fence "" } 3 4// Copyright (C) 2009-2015 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// You should have received a copy of the GNU General Public License along 18// with this library; see the file COPYING3. If not see 19// <http://www.gnu.org/licenses/>. 20 21#include <atomic> 22#include <testsuite_hooks.h> 23 24int main() 25{ 26 bool test __attribute__((unused)) = true; 27 std::atomic_flag f = ATOMIC_FLAG_INIT; 28 29 f.clear(); // set to false 30 VERIFY( false == f.test_and_set() ); // return previous false, set to true 31 VERIFY( true == f.test_and_set() ); // return true 32 33 return 0; 34} 35