m>[loop]</em><a href='#index-event_002dloop_002drun_0021' class='copiable-anchor'> &para;</a></span></dt>
<dd><p>The &rsquo;loop&rsquo; (event loop) argument is optional.  This procedure starts
the event loop passed in as an argument, or if none is passed (or #f
is passed) it starts the default event loop.  The event loop will run
in the thread which calls this procedure.  If this procedure has
returned, including after a call to event-loop-quit!, this procedure
may be called again to restart the event loop