关于listen、run和runAll的问题

public function onWorkerStart(Worker $worker): void
    {
        $innerWorker = new Worker('tcp://0.0.0.0:6790');
        $innerWorker->name = 'test-inner-worker';
        $innerWorker->reusePort = false;
        $innerWorker->onWorkerStart = function ($worker) {
            echo "子线程开启";
            Timer::add(5, function () {
                echo "SubThread";
            });
        };
        $innerWorker->listen();
//        $innerWorker->run();
        Timer::add(2, function () {
            echo "MainThread";
        });

    }