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jibabi
V2EX  ›  Python

求助 Python multiprocessing 守护进程为什么不允许有子进程?

  •  
  •   jibabi · 2019-06-20 17:02:34 +08:00 · 3756 次点击
    这是一个创建于 1268 天前的主题,其中的信息可能已经有所发展或是发生改变。
    本人代码如下:

    import multiprocessing
    import time

    def process_a():
    for _ in range(10):
    print("process a")
    time.sleep(1)

    def process_b():
    print("process b")
    ps = []
    for _ in range(3):
    p = multiprocessing.Process(target=process_a)
    p.daemon = True
    p.start()
    ps.append(p)
    for i in ps:
    i.join()

    if __name__ == '__main__':
    p = multiprocessing.Process(target=process_b)
    p.daemon = True
    p.start()
    p.join()

    运行报错:AssertionError: daemonic processes are not allowed to have children
    想问一下 multiprocessing 是出于什么原因,决定守护进程不能再创建子进程?谢谢
    2 条回复    2019-07-18 17:36:59 +08:00
    liuguichao
        1
    liuguichao  
       2019-07-03 09:42:03 +08:00
    Note that a daemonic process is not allowed to create child processes. Otherwise a daemonic process would leave its children orphaned if it gets terminated when its parent process exits. Additionally, these are not Unix daemons or services, they are normal processes that will be terminated (and not joined) if non-daemonic processes have exited.
    wuwukai007
        2
    wuwukai007  
       2019-07-18 17:36:59 +08:00
    设置环境变量 export PYTHONOPTIMIZE=1

    ldconfig
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