Function tokio::time::timeout_at

Important traits for Timeout<T>

impl<T> Future for Timeout<T> where
    T: Future,  type Output = Result<T::Output, Elapsed>;

pub fn timeout_at<T>(deadline: Instant, future: T) -> Timeout<T> where
    T: Future, 

This is supported on feature="time" only.

Require a Future to complete before the specified instant in time.

If the future completes before the instant is reached, then the completed value is returned. Otherwise, an error is returned.

Cancelation

Cancelling a timeout is done by dropping the future. No additional cleanup or other work is required.

The original future may be obtained by calling Timeout::into_inner. This consumes the Timeout.

Examples

Create a new Timeout set to expire in 10 milliseconds.

use tokio::time::{Instant, timeout_at};
use tokio::sync::oneshot;

use std::time::Duration;

let (tx, rx) = oneshot::channel();

// Wrap the future with a `Timeout` set to expire 10 milliseconds into the
// future.
if let Err(_) = timeout_at(Instant::now() + Duration::from_millis(10), rx).await {
    println!("did not receive value within 10 ms");
}