main.rs

use std::thread;
use std::sync::{ Arc, Mutex };
use std::time::Duration;

fn kickoff_background(counter: &Arc<Mutex<u32>>) -> thread::JoinHandle<std::result::Result<(), ()>> {
    let counter = counter.clone();
    return thread::spawn(move || {
        loop {
            let mut number = counter.lock().unwrap();

            *number += 1;

            println!("Tick {}", *number);

            if *number == 11 {
                println!("Made it to 11");
                return Ok(());
            }

            drop(number);

            thread::sleep(Duration::from_millis(1000));
        }
    });
}

fn kickoff_offset(counter: &Arc<Mutex<u32>>) -> thread::JoinHandle<thread::Thread> {
    let counter = counter.clone();
    return thread::spawn(move || {
        loop {
            thread::sleep(Duration::from_millis(500));

            let mut number = counter.lock().unwrap();

            *number += 1;

            println!("Tock {}", *number);

            drop(number);

            thread::sleep(Duration::from_millis(500));
        }
    });
}

fn main() {
    let counter = Arc::new(Mutex::new(0));

    let bg = kickoff_background(&counter);
    kickoff_offset(&counter);

    bg.join().unwrap().unwrap();
}