d in order to check if the registering  <code>coroutine</code> is not already registered in the lists of I/O blocked threads.
	</dd>

	<dt><code><b>step</b>()</code></dt>
		Redefinition of superclass method that also unblocks waiting threads when their I/O channels are ready for access.
	<dd>
		
	</dd>
	
</dl>

<h2>Remarks</h2>

<ul>
	<li>
		This class was mainly devised for use with the asynchronous support provided by <a href="http://www.tecgraf.puc-rio.br/luasocket">LuaSocket</a> library for socket chann