ore convenient for
composing asynchronous tasks.  In retrospect, this procedure offers
little over await-yield!, apart from symmetry with
await-task-in-thread!.
</p>
<p>This procedure must (like the a-sync procedure) be called in the same
thread as that in which the event loop runs.
</p>
<p>This procedure calls event-post! in the event loop concerned.  This is
done in the same thread as that in which the event loop runs so it
cannot of itself be throttled.  However it may contribute to the
number of accumul