use std::sync::{Arc, RwLock};
use std::{thread, time};

fn main() {

    let lock = Arc::new(RwLock::new(1));
    let c_lock = lock.clone();

    thread::spawn(move || {
        println!("Begin Read");
        let n = lock.read().unwrap();
        assert_eq!(*n, 1);

        println!("Sleeping");
        thread::sleep(time::Duration::from_millis(10000));
    });

    thread::spawn(move || {
        thread::sleep(time::Duration::from_millis(2000));
        println!("Begin Write");
        let r = c_lock.write();
        assert!(r.is_ok());

        thread::sleep(time::Duration::from_millis(5000));
        println!("Done Write");
    });

    loop {
        thread::sleep(time::Duration::from_millis(100));
    };
}