Macro deadline 

macro_rules! deadline {
    ($wait_limit: expr, $condition: expr) => { ... };
}

Requires a condition closure to return true before the specified duration has elapsed.

This will panic if the provided closure doesn’t evaluate to true before the provided duration expires. Internally, it creates a Future from the closure that is polled until it returns true or times out. This ensures the call is non-blocking to the async runtime.

Examples

Waiting for an AtomicI32 to be incremented to 42:

let x = Arc::new(AtomicI32::new(41));
let y = 42;

let x_clone = x.clone();
tokio::spawn(async move {
    tokio::time::sleep(std::time::Duration::from_millis(5)).await;
    x_clone.fetch_add(1, Ordering::SeqCst);
});

deadline!(Duration::from_millis(10), move || {
    x.load(Ordering::Relaxed) == y
});