main.rs

use std::thread;
use std::sync::Arc;

fn main() {
    let a1 = Arc::new(0);
    let mut a2 = a1.clone();
    let t1 = thread::spawn(
        move || {
            for _ in 0..10 {
                let _z: u32 = *a1;
            }
            drop(a1);
        }
    );
    let t2 = thread::spawn(
            move || {
            loop {
                match Arc::get_mut(&mut a2) {
                    None => {}
                    Some(m) => {
                        *m = 1u32;
                        return;
                    }
                }
            }
        }
    );
    t2.join().unwrap();
    t1.join().unwrap();
}