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[thirdparty/gcc.git] / libstdc++-v3 / testsuite / 29_atomics / atomic_flag / clear / 1.cc

// { dg-do run { target c++11 } }
// { dg-require-thread-fence "" }

// Copyright (C) 2009-2022 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 <atomic>
#include <testsuite_hooks.h>

int main()
{
  std::atomic_flag f = ATOMIC_FLAG_INIT;

  f.clear();                           // set to false
  VERIFY( false == f.test_and_set() ); // return true
  VERIFY( true == f.test_and_set() );  // return true
  f.clear();                           // set to false
  VERIFY( false == f.test_and_set() ); // return previous false, set to true
}