Question

我想从我的python代码中将一个程序的两个实例作为不同的线程运行。在他们两个都完成之后，我还要做一些其他的事情。

让我们说我有这样的代码：

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()

此代码在两个线程完成之前打印Main: all done。但我想等到它们完成后再打印all Done。有什么解决方法的想法吗？

Answer 1

您可以使用thread.join()等待线程完成。

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")
    x.join()
    logging.info("Main: all done")


if __name__ == "__main__":
    main()

Answer 2

join(timeout=None)¶

等待直到线程终止。这将阻塞调用线程，直到调用join（）方法的线程终止–通常是或通过未处理的异常-或直到可选超时发生。

如何同时运行两个线程并等待结果

2 个答案: