Why the App exit loop after run()??

[wengjianhong]

when I use this code:

SocketApp(){
    SocketApp.ws<PerSocketData>("/*", std::move(behavior));
    uWS::App::WebSocketBehavior<PerSocketData> behavior;
    behavior.compression = uWS::DEDICATED_COMPRESSOR_3KB;
    behavior.maxPayloadLength = 16 * 1024 * 1024;
    behavior.maxBackpressure = 1 * 1024 * 1024;
    behavior.closeOnBackpressureLimit = false;
    behavior.resetIdleTimeoutOnSend = false;
    behavior.sendPingsAutomatically = true;
    behavior.idleTimeout = 16;
    behavior.upgrade = nullptr;
    
    behavior.open = [this](auto* ws) {
        /* Let's make every connection subscribe to the "broadcast" topic */
        LOG(INFO) << "New connection is open..." << endl;
        ws->subscribe(Topic);
        // AutoPublish();
    };
    ...
    SocketApp.listen(Port, [this](auto* listen_socket) {
        GlobalListenSocket = listen_socket;
        if (listen_socket) {
            LOG(INFO) << "Listening on port: " << this->Port << std::endl;
        }
        }
    );
    SocketApp.run();
}

But if I call SocketApp.run(); by this code, the run() function will run over soon, and loop will exit soon, too.
In other word, the socketApp will not run server ok.
why??

void DataServer::Run(void* param) {
    LOG(INFO) << "Server is running..." << endl;
    ((DataServer*)param)->SocketApp.run();
}

In addition, I try define the SocketApp as global variable, the server run OK, if I define the SocketApp as local variable, the server can't run ok.