Function spawn_blocking 

pub async fn spawn_blocking<F, R>(
    runtime: Runtime,
    f: F,
) -> Result<R, SpawnBlockingError>
where
    F: FnOnce() -> R + Send + 'static,
    R: Send + 'static,

Runs the given closure on a thread where blocking is acceptable.

Errors

See SpawnBlockingError for details.