ch3-05-out-of-thin-air.rs

use std::sync::atomic::AtomicI32;
use std::sync::atomic::Ordering::Relaxed;
use std::thread;

static X: AtomicI32 = AtomicI32::new(0);
static Y: AtomicI32 = AtomicI32::new(0);

fn main() {
    let a = thread::spawn(|| {
        let x = X.load(Relaxed);
        Y.store(x, Relaxed);
    });
    let b = thread::spawn(|| {
        let y = Y.load(Relaxed);
        X.store(y, Relaxed);
    });
    a.join().unwrap();
    b.join().unwrap();
    assert_eq!(X.load(Relaxed), 0); // Might fail?
    assert_eq!(Y.load(Relaxed), 0); // Might fail?
}