n="baseline" nowrap><i>tag</i></td><td valign="baseline">&nbsp;&nbsp;&nbsp;&nbsp;</td><td valign="baseline"> An object (default is <code>nil</code>)
</td></tr><tr valign="top"><td valign="baseline" nowrap><i>write-empty-queue-p</i></td><td valign="baseline">&nbsp;&nbsp;&nbsp;&nbsp;</td><td valign="baseline"> A <a href="ref-glossary.html#id86">generalized&nbsp;boolean</a> (default is <code>nil</code>)
</td></tr></table>
</p>
<p><span class="fndoclabel">See also</span>
<br>&nbsp;&nbsp;&nbsp;&nbsp;<a href="ref