pan><span class="cm">,</span> <span class="i">$headers</span><span class="cm">,</span> <span class="i">$message</span> <span class="s">)</span> = <span class="i">@_</span><span class="sc">;</span>
    
                <span class="k">flock</span><span class="s">(</span> <span class="w">OUT</span><span class="cm">,</span> <span class="w">LOCK_EX</span> <span class="s">)</span><span class="sc">;</span>
                <span class="k">print</span> <span class="i">OUT</span> <span class="k">join</span><span cla