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<p>Try to enter a critical region if it is not locked. </p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">x</td><td>A pointer to a <a class="el" href="group__critical.html#gae454b08515c952ae1b6d90d161705412" title="a critical region">t_critical</a> struct, or zero to uses Max’s global critical region. </td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>returns non-zero if there was a problem 