pan class="nv">queue</span><span class="p">:</span> <span class="kt">OperationQueue</span> <span class="o">=</span> <span class="o">.</span><span class="n">main</span><span class="p">,</span>
            <span class="nv">handler</span><span class="p">:</span> <span class="kd">@escaping</span> <span class="p">(</span><span class="kt"><a href="../Classes/SystemClockMonitor/Event.html">Event</a></span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Void</span><span class="p">)</span></co