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// { dg-options "-x c -shared-libgcc -lstdc++" }

// Copyright (C) 2009 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.

// You should have received a copy of the GNU General Public License along

// with this library; see the file COPYING3.  If not see

// <http://www.gnu.org/licenses/>.

#include <cassert>

#include <stdatomic.h>

// libstdc++/40826

// libstdc++/40654

int main()

{

  atomic_flag f = ATOMIC_FLAG_INIT;

  atomic_flag_clear(&f); // set to false

  assert( false == atomic_flag_test_and_set(&f) ); // return previous false, set to true

  assert( true == atomic_flag_test_and_set(&f) ); // return true

  return 0;

}