ay.
</p>
<p>After this procedure has been called, any attempt to add further tasks
with the thread-pool-add! procedure will fail, and that procedure will
throw a &rsquo;thread-pool-error exception.  The same exception will be
thrown if this procedure is applied to a thread pool to which this
procedure has previously been applied.
</p>
<p>This procedure is thread safe (any thread may call it) unless the
non-blocking setting is #f, in which case no task running on the
thread-pool object may call this procedur