-in-thread!,
await-task-in-event-loop!, await-task-in-thread-pool!,
await-generator-in-thread!, await-generator-in-event-loop! or
await-generator-in-thread-pool!.
</p>
<p>This procedure always returns #f unless meeting-close has been applied
to a meeting object, in which case &rsquo;stop-iteration is returned.  Note
that if multiple meeting objects are passed to this procedure and one
of them is then closed, this procedure will return &rsquo;stop-iteration and
any wait will be abandonned.  It is usually a b