>Set the hashtab's readonly bit. </p>
<p>By default the readonly bit is 0, indicating that it is threadsafe for both reading and writing. Setting the readonly bit to 1 will disable the hashtab's theadsafety mechanism, increasing performance but at the expense of threadsafe operation. Unless you can guarantee the threading context for a hashtab's use, you should leave this set to 0.</p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">x</td><td>The hashtab ins