runners.py 文件源码

def start_qt_scene_app_subprocess():
    """
    Starts a remote sub-process that initializes a TurtleScene widget and Qt's
    mainloop.
    """

    inbox = MailboxState.inbox = Queue()
    outbox = MailboxState.outbox = Queue()
    process = Process(target=start_qt_scene_app,
                      kwargs=dict(outbox=outbox, inbox=inbox, ping=True),
                      name='turtle-server')
    process.daemon = True
    process.start()

    # Send a ping message to the out process
    outbox.put(['ping'])
    msg = inbox.get(timeout=2.0)
    if msg != ['ping']:
        raise RuntimeError('wrong response from server: %s' % (msg,))

    return process