Function swanling::util::sleep_minus_drift

pub async fn sleep_minus_drift(duration: Duration, drift: Instant) -> Instant

Sleep for a specified duration, minus the time spent doing other things.

Example

use swanling::util;

async fn loop_with_delay() {
    loop {
        // Start drift timer.
        let mut drift_timer = tokio::time::Instant::now();

        // Do other stuff, in this case sleep 250 milliseconds. This is
        // the "drift" that will be subtracted from the sleep time later.
        tokio::time::sleep(tokio::time::Duration::from_millis(250));

        // Sleep for 1 second minus the time spent doing other stuff.
        drift_timer = util::sleep_minus_drift(
            tokio::time::Duration::from_secs(1),
            drift_timer,
        ).await;

        // Normally the loop would continue, and the amount of time doing
        // other things would vary each time, but the total time to complete
        // the loop would remain the same.
        break;
    }
}