[chen_dev]

1) what

#![allow(unused)]

fn main() {

    use std::sync::atomic::{AtomicI64, Ordering};

    let some_var = AtomicI64::new(5);
    
    if some_var.load(Ordering::Relaxed) % 2 == 0 {
        some_var.fetch_add(1, Ordering::Relaxed);
    } else {
        some_var.fetch_add(2, Ordering::Relaxed);
    }
}