僵尸进程介绍

  • Z(zombie)-僵尸进程（子进程终止，父进程没有wait子进程）

僵尸进程产生原因

  • 僵尸进程是当子进程比父进程先结束，而父进程又没有回收子进程，释放子进程占用的资源，此时子进程将成为一个僵尸进程。（一个进程结束了，但是他的父进程没有等待（调用wait/ waitpid）他，那么他将变成一个僵尸进程）
  • 僵死进程会以终止状态保持在进程表中，并且会一直在等待父进程读取退出状态代码。
  • 所以，只要子进程退出，父进程还在运行，但父进程没有读取子进程状态，子进程进入Z状态

系统为什么需要僵尸进程这种进程状态

由于父进程创建子进程是异步的，双方不知道各自的运行状态，而父进程有的时候需要知道子进程退出时的一些信息，所以 linux提供了一种机制，通过让子进程退出时向父进程发送 SIGCHRD 信号来告知父进程，子进程已经退出了。同时，父进程通过调用 wait 和 waitpid 来获取子进程的退出信息。

僵尸进程的危害

  • 占用系统资源
  • 造成内存泄漏

如何防止僵尸进程

  • 让僵尸进程变成孤儿进程，由init回收，就是让父亲先死
  • 采用信号SIGCHLD通知处理，并在信号处理程序中调用wait函数
  • 让僵尸进程的父进程来回收，父进程每隔一段时间来查询子进程是否结束并回收，调用wait()或者waitpid(),通知内核释放僵尸进程

参考链接

  • https://blog.csdn.net/didi1663478999/article/details/98886027

代理进程退出，变成僵死进程原因

  • parent创建代理程序拿到代理程序pid和代理端口，ip，没有wait代理进程
  • 代理进程自杀后parent没有处理信号
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创建
parent父进程
代理进程

解决代理变成僵尸进程方法

  • parent创建一个中间进程process并等待process返回,
  • process作为代理的父进程，来创建代理进程
  • processc创建完代理进程返回代理进程pid，代理端口port，ip,自动退出
  • 此时代理进程变成孤儿进程，被系统init托管,代理进程自杀不会成未僵死进程
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创建
创建
parent父进程
process
代理进程

代码

import time
import subprocess
from multiprocessing import Process, Queuedef open_test_server(port, q):com = '/Users/job/Venvs/test/bin/python {} {}'.format('/Users/job/my_tests/test_server.py', port)try:test_process = subprocess.Popen(com.split())pid = test_process.pidexcept Exception as e:test_process = Nonepid = Noneprint(e)q.put({'pid': pid})def main(port):q = Queue()sub_process = Process(target=open_test_server, args=(port, q))sub_process.start()sub_process.join()info = q.get()print(info)if __name__ == '__main__':main(12345)while True:time.sleep(10)print('父进程睡了10秒')

设置守护线程-解决subprocess启动的僵尸进程

  1. 启动线程
  2. 设置为守护线程 setDaemon(True)
  3. 循环监听等待信号

代码

import threading
import subprocessdef start_proxy():try:p = subprocess.Popen("要启动的程序", stdout=subprocess.PIPE, stderr=subprocess.PIPE)while True:process_code = p.poll()if process_code is not None and process_code != 0:print("进程异常退出！{}".format(str(process_code)))breakif process_code == 0:print("进程正常退出！{}".format(str(process_code)))breakexcept Exception as e:print(e)def start_threading():try:td = threading.Thread(target=start_proxy)td.setDaemon(True)td.start()except threading.ThreadError as e:print(e)if __name__ == '__main__':start_threading()

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