t">   * to make sure that the variable is *not* allocated on the stack.</span>
<span class="comment">   */</span>
  <span class="keyword">static</span> <span class="keywordtype">int</span> keys;

  <span class="comment">/*</span>
<span class="comment">   * Declare the beginning of the protothread.</span>
<span class="comment">   */</span>
  <a class="code" href="a00014.html#g2ffbb9e554e08a343ae2f9de4bedfdfc">PT_BEGIN</a>(pt);

  <span class="comment">/*</span>
<span class="comment">   * We'll let 