ocedure for further information about that.
</p>
<p>Exceptions may propagate out of this procedure if they arise while
setting up (that is, before the worker thread starts), which shouldn&rsquo;t
happen unless memory is exhausted or pthread has run out of resources.
Exceptions arising during execution of the generator, if not caught by
a handler procedure, will terminate the program.  Exceptions thrown by
the handler procedure will propagate out of event-loop-run!.
Exceptions thrown by &rsquo;proc&rsquo;, i