#![allow(non_snake_case)]

use std::sync::Arc;
use std::thread;
use std::time::{Duration, Instant};
use tokio::sync::Notify;

async fn delay(dur: Duration) {
    let when = Instant::now() + dur;
    let notify = Arc::new(Notify::new());
    let notify2 = notify.clone();

    thread::spawn(move || {
        let now = Instant::now();

        if now < when {
            thread::sleep(when - now);
        }

        notify2.notify_one();
    });

    notify.notified().await;
}