Python:如何终止多线程的Python程序?

问题描述:

我想创建一个包含两个主机列表的程序。我想从每个主机读取数据。这将需要大约5-10秒,所以我想用不同的线程读取每个主机数据。Python:如何终止多线程的Python程序?

我创建了下面的代码,它按照我的期望工作,但问题是当我按下Ctrl + c时,程序没有终止。

我的代码:

import threading 
import time,os,sys 
import signal 

is_running = True 

def signal_handler(signal, frame): 
    print "cleaning up...please wait..." 
    v1.stop() 
    v2.stop() 
    global is_running 
    is_running = False 

class Thread2(threading.Thread): 
    def __init__(self, function,args): 
     self.running = False 
     self.function = function 
     self.args = args 
     super(Thread2, self).__init__() 

    def start(self): 
     self.running = True 
     super(Thread2, self).start() 

    def run(self): 
     while is_running: 
      self.function(self.args) 
      time.sleep(time_interval) 

    def stop(self): 
     self.running = False 

def b_iterate(hostnames): 

    for host_name in hostnames: 
     v = Thread2(function = read_cet_data,args = host_name) 
     v.start() 

def read_b_data(host): 

    # 
    #reading some data from current host (5-10 seconds processing) 
    # 
    #here, this thread is not neccessary, want to stop or kill or terminate it 
    if threading.current_thread().isAlive(): 
     threading.current_thread().stop() 

def a_iterate(entp_hostnames): 

    for host_name in entp_hostnames: 
     v = Thread2(function = read_entp_data,args = host_name) 
     v.start() 

def read_a_data(host): 

    # 
    #reading some data from current host (5-10 seconds processing) 
    # 
    #here, this thread is not neccessary, want to stop or kill or terminate it 
    if threading.current_thread().isAlive(): 
     threading.current_thread().stop() 

if __name__ == "__main__": 

    signal.signal(signal.SIGINT, signal_handler) 
    #a_hostnmaes & b_hostnmaes are the lists of hostnames 
    v1 = Thread2(function = a_iterate,args = a_hostnames) 
    v2 = Thread2(function = b_iterate,args = b_hostnames) 
    v1.start() 
    v2.start() 
    while is_running: 
     pass 

我怎样才能使按Ctrl + C后,这个程序终止。我错过了什么吗?

+0

检查:https://*.com/questions/1112343/how-do-i-capture-sigint-in-python和https://计算器。 com/questions/18114560/python-catch-ctrl -c-command-prompt-really-want-to-quit-yn-resume-executi – Drako

+0

@ Drako-我检查了它。由于多线程,我的程序没有终止。我如何通知它终止。 – kit

+0

对不起,我从来没有需要任何多线程,只是轻量级的应用程序,在1线程运行良好:) - 没有经验,只是希望这些链接可以帮助想法 – Drako

如果您只想控制C完成所有操作,则不需要在线程中使用停止功能。您可以将它们进行daemon:

v1 = Thread2(function = a_iterate,args = a_hostnames) 
v2 = Thread2(function = b_iterate,args = b_hostnames) 
v1.daemon = True 
v2.daemon = True 
v1.start() 
v2.start() 

只要主程序死掉,这些线程也会死机。您需要将.daemon = True添加到创建线程的代码中的所有其他位置。

哈努哈利

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@ Hannu-感谢您的答案。我有一个小小的怀疑。在read_b_data和read_a_data函数中,我如何终止或停止这个守护进程线程? – kit

您可以

  • 抓一个KeyboardInterrupt在主线程
  • 设置一个标志,以便另一个线程可以检测到它,并退出

  • 赶上Keybo ardInterrupt
  • 调用os._exit()