avior:</p>
    <ul>
    <li><b><code>controlConcurrency</code></b> may be overridden to add
    conditions;</li>
    <li><b><code>permitDenied</code></b> may be overridden to add error handling
    when a permit isn't granted.</li>
    </ul>

  </div></div>

  <div class="subsection"><h4 id="Semaphore_Valve/Attributes">Attributes</h4><div class="text">

    <p>The <strong>Semaphore Valve</strong> supports the following
    configuration attributes:</p>

    <table class="defaultTable"><tr><th style="width: 