wait_002dput_002dstring_0021' class='copiable-anchor'> &para;</a></span></dt>
<dd><p>This is a convenience procedure for use in an event loop, which will
start a write watch on &rsquo;port&rsquo; for writing a string to the port, which
must be non-blocking.  It calls &rsquo;await&rsquo; if it has to wait for output
to become available.  Provided &rsquo;port&rsquo; is a non-blocking port, the
event loop will not be blocked by this procedure even if only
individual characters or part characters can be written