erm">Returns:</span></p></td>
<td><p>the rank of the process that can perform I/O, <code class="computeroutput">any_source</code> if every process can perform I/O, or no value if no process can perform I/O. </p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <a name="idp43965184-bb"></a><span class="identifier">processor_name</