如何同时运行两个线程并等待结果

我想从我的python代码运行一个程序的两个实例，作为不同的线程。在他们两个都执行完成之后，我想执行一些其他操作。 有以下代码：

import logging
import threading
import time


def thread_function(name):
    logging.info("Thread %s: starting ", name)
    time.sleep(2)
    logging.info("Thread %s: finishing ", name)


def main():
    format = "%(asctime)s: %(message)s"
    logging.basicConfig(format=format, level=logging.INFO, datefmt="%H:%M:%S")

    logging.info("Main: before creating thread")
    x = threading.Thread(target=thread_function, args=(1,))
    logging.info("Main: before running thread")
    x.start()
    logging.info("Main: wait for the thread to finish")
    logging.info("Main: all done")


if __name__ == "__main__":
    main()

Main: all done在两个线程完成之前打印此代码。但是我要等到完成并打印出来all Done。应该如何解决？