rust-threads.rs

  let delay = time::Duration::from_millis(1);
  let now = time::Instant::now();

  let thread_delay = Arc::new(1);

  let mut done = false;
  while !done {
    let thread_delay = Arc::clone(&thread_delay);

    let handle = thread::spawn(move || {
      for j in 1..20 {
        println!("hi number {} from the spawned thread!", j);
        thread::sleep(time::Duration::from_millis(*thread_delay));
      }
      println!("Thread end: {:#?}", now.elapsed());
    });

    for i in 1..10 {
      println!("hi number {} from the main thread!", i);
      thread::sleep(time::Duration::from_millis(1));
    }
    println!("Loop end: {:#?}", now.elapsed());

    handle.join().unwrap();
    done = true;
  }

  println!("Elapsed: {:#?}", now.elapsed());

https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=3b3d8e740c90a0986ba1fe5c5c14c364

https://doc.rust-lang.org/book/ch16-01-threads.html