daemonic processes are not allowed to have children

import multiprocessing
import time


def func(msg):
    time.sleep(1)
    print multiprocessing.current_process().name + '-' + msg

    def spider():
        time.sleep(2)
        print multiprocessing.current_process().name + '-' + msg

    try:
        pool1 = multiprocessing.Pool(processes=10)  

        for i in [page for page in range(100)]:
            msg = "word %d" % (i)
            print "msg",msg
            pool1.apply_async(spider, (msg,))
        pool1.close()
        pool1.join()
    except Exception as e :
        print e



if __name__ == "__main__":
    start_time = time.time()

    pool = multiprocessing.Pool(processes=10)  
    results = []
    for i in [page for page in range(10)]:
        msg = "hello %d" % (i)
        results.append(pool.apply_async(func, (msg,)))
    pool.close()
    pool.join()
    print time.time()-start_time

 

子进程不能在通过multiprocessing创建后代进程，否则当父进程退出后，它终结其daemon子进程，那孙子进程就成了孤儿进程了。当尝试这么做时，会报错：AssertionError: daemonic processes are not allowed to have children