Method async_run

common/event-loop.cpp:40–46

        __run();
    }
    virtual void async_run() override
    {
        if (m_state != STOP)
            return;
        m_state = RUNNING;
        m_thread = thread_create(&_run, this);
    }
    static void* _run(void* loop)
    {
        static_cast<EventLoopImpl*>(loop)->__run();