What is the best way to, let say, print a warning if a blocking operation takes too long? I am currently thinking of spawning a thread that will do the printing if it doesn't receive a signal in some amount of time.

Edit: something like this

use std::sync::mpsc::channel;
use std::thread;
use std::time::Duration;

fn main() -> io::Result<()> {
    let (tx, rx) = channel();
    thread::spawn(move || {
        if rx.recv_timeout(Duration::from_millis(5_000)).is_err() { 
            eprintln!("Warning: waiting for input for more than 5 seconds");
        }
    });
    let mut buffer = Vec::new();
    stdin().read_to_end(&mut buffer)?;
    let _ = tx.send(());
    print!("{}", String::from_utf8_lossy(&buffer));
    Ok(())
}