struct S {
  v: i32
}

fn main()
{
  let n_container = std::sync::Arc::new(std::sync::Mutex::new(S{v: 5}));
  let n  = std::sync::Arc::clone(&n_container);
  let n1 = std::sync::Arc::clone(&n_container);
  let lock_result;
  let thread_body = move || {
    for i in 1..10 {
      {
        let lock_result = n.lock();
        if let std::sync::LockResult::Ok(my_n) = lock_result {

          println!("Count {}, n is {}", i, my_n.v);
        } else {
          println!("Lock failed???");
        }
      }
      std::thread::sleep(std::time::Duration::from_millis(100));
    }
  };
  let h = std::thread::spawn(thread_body);

  std::thread::sleep(std::time::Duration::from_millis(300));
  lock_result = n1.lock();
  if let std::sync::LockResult::Ok(mut main_n) = lock_result {
    println!("Main thread, here!");
    main_n.v = 6;
    println!("My new n value is {}", main_n.v);
    drop(main_n);
  }

  h.join();
}