/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>
            Users should take care not to mix these two approaches concurrently.
            Also, none of these methods should be called if the dedicated feeding
            thread is running (i.e., the <code class="computeroutput"><span class="identifier">start_thread</span></code>
            was not specified in the construction or had the value of <code class="computeroutput"><span class="keyword">true</s