 is about to fork, or has just forked. This allows the
          <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>,
          and the services it contains, to perform any necessary housekeeping to
          ensure correct operation following a fork.
        </p>
<p>
          This function must not be called while any other <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput"