// { dg-do run }
// { dg-additional-options "-pthread" { target pthread } }
// { dg-require-effective-target c++11 }
// { dg-require-gthreads "" }

// Copyright (C) 2010-2021 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 <mutex>
#include <system_error>
#include <testsuite_hooks.h>

int main()
{
  typedef std::mutex mutex_type;
  typedef std::unique_lock<mutex_type> lock_type;

  try
    {
      mutex_type m1, m2, m3;
      lock_type l1(m1, std::defer_lock), 
	l2(m2, std::defer_lock),
	l3(m3, std::defer_lock);

      try
	{
	  std::lock(l1, l2, l3);
	  VERIFY( l1.owns_lock() );
	  VERIFY( l2.owns_lock() );
	  VERIFY( l3.owns_lock() );
	}
      catch (const std::system_error& e)
	{
	  VERIFY( false );
	}
    }
  catch (const std::system_error& e)
    {
      VERIFY( false );
    }
  catch (...)
    {
      VERIFY( false );
    }

  return 0;
}