如何在python中终止进程之前执行代码? [英] How to execute code just before terminating the process in python?

问题描述

这个问题涉及 python 中的多处理.我想在终止进程时执行一些代码，更具体地说，在它即将终止之前.我正在寻找一种可以作为 python 程序的 atexit.register 的解决方案.

This question concerns multiprocessing in python. I want to execute some code when I terminate the process, to be more specific just before it will be terminated. I'm looking for a solution which works as atexit.register for the python program.

我有一个看起来像的方法工作者:

I have a method worker which looks:

定义工人():为真:打印('工作')时间.sleep(2)返回

def worker(): while True: print('work') time.sleep(2) return

我运行它:

proc = multiprocessing.Process(target=worker, args=())proc.start()

proc = multiprocessing.Process(target=worker, args=()) proc.start()

我的目标是在终止之前执行一些额外的代码，我这样做:

My goal is to execute some extra code just before terminating it, which I do by:

proc.terminate()

proc.terminate()

推荐答案

使用信号处理和拦截 SIGTERM:

Use signal handling and intercept SIGTERM:

import multiprocessing
import time
import sys
from signal import signal, SIGTERM

def before_exit(*args):
    print('Hello')
    sys.exit(0)  # don't forget to exit!


def worker():
    signal(SIGTERM, before_exit)
    time.sleep(10)

proc = multiprocessing.Process(target=worker, args=())
proc.start()
time.sleep(3)
proc.terminate()

在子进程终止前产生所需的输出.

Produces the desirable output just before subprocess termination.

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