ss="paramname">num_io_workers</td><td>defines the number of background threads that will be used to process read and write callbacks. This must be a strictly positive value. </td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>shared_ptr to the default instance of the <a class="el" href="classtacopie_1_1io__service.html">io_service</a> </dd></dl>

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