#[must_use = "yield_now does nothing unless polled/`await`-ed"]pub async fn yield_now()
Yields execution back to the Tokio runtime.
A task yields by awaiting on
yield_now(), and may resume when that
future completes (with no output.) The current task will be re-added as
a pending task at the back of the pending queue. Any other pending
tasks will be scheduled. No other waking is required for the task to
See also the usage example in the task module.