ta</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">
<p>Read the next item from the queue.</p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">stream_idx</td><td>the index of the stream that was processed or -1 will be written here </td></tr>
    <tr><td class="paramname">data</td><td>the data item will be written here on success using the c