on_work_started"><span class="bold"><strong>on_work_started</strong></span></a>
                </p>
              </td>
<td>
                <p>
                  Inform the executor that it has some outstanding work to do.
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <a class="link" href="executor/operator_unspecified_bool_type.html" title="executor::operator unspecified_bool_type"><span class="bold"><strong>operator unspecified_bool_type</strong></span></