 integer, but must never explicitly return - returning is</span>
<span class="comment"> * performed inside the protothread statements.</span>
<span class="comment"> *</span>
<span class="comment"> * The protothread function is driven by the main loop further down in</span>
<span class="comment"> * the code.</span>
<span class="comment"> */</span>
<span class="keyword">static</span> <span class="keywordtype">int</span>
protothread1(<span class="keyword">struct</span> <a class="code" href="a00005.html"