python清理僵尸进程的两种方法

import multiprocessing as mp
from time import sleep
import shortuuid
import os
import psutil

# 方法1 信号
import signal
signal.signal(signal.SIGCHLD, signal.SIG_IGN)

class P(mp.Process):
    def __init__(self, name):
        super(P, self).__init__()
        self.name = name
        
        
    def run(self):
        sleep(5)
        
        

if __name__ == '__main__':
    ps = []
    for _ in range(10):
        name = str(shortuuid.uuid())
        print(name)
        ps.append(P(name))

    ps[0].daemon = True
    for p in ps:
        p.start()
    
    # 父进程id
    pid = os.getpid()
    p_g = psutil.Process(pid)


    while True:

        # print(">>>>>>>>>>>>>>>>>>>>>>>>>>>>", flush=True)
        # 所有子进程对象，包括执行中、sleeping、僵尸进程等
        children = p_g.children()
        if len(children) == 0:
            break
        print(children)
        sleep(1)
        
        # 方法2 waitpid，如果不存在子进程则抛异常
        # try:
        #     os.waitpid(-1, os.WNOHANG)
        # except Exception as e:
        #     break


    print("finished")

waipid和signal