python ctrl c 结束线程_python ctrl关闭所有线程-优快云博客

本文通过两个Python代码示例，深入探讨了如何在Python中使用线程进行任务处理，并重点讲解了如何实现线程的优雅退出。第一个示例展示了如何通过设置线程的运行状态来控制线程的生命周期；第二个示例则介绍了如何利用全局变量和信号处理函数来响应外部中断信号，从而实现在接收到中断信号时线程能够平滑地结束运行。

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例子1

#!/usr/bin/python
#-*- coding:utf-8 -*-
import sys
import threading

import time


class TaskThread(threading.Thread):

    def __init__(self, cnt):
        threading.Thread.__init__(self)
        self.cnt = cnt
        self.running = True

    def run(self):

        while self.running:
            time.sleep(1)
            print("cnt = %d\n" % self.cnt)
            self.cnt = self.cnt - 1

            if self.cnt <= 0:
                break

        print('task thread exit!\n')


if __name__ == "__main__":
    task = TaskThread(20)
    task.start()
    main_alive = True
    try:
        while main_alive:
            time.sleep(1)
            print('#\n')
    except KeyboardInterrupt:
        print('Ctrl C  To Exit\n')

    task.running = False
    print('Main Process Exit\n')

log为：

E:\python\work\thread_t1>python thread_test1.py
cnt = 20

#

cnt = 19

#

cnt = 18

#

cnt = 17

#

cnt = 16

#

Ctrl C  To Exit

Main Process Exit

cnt = 15

task thread exit!

例子2

#!/usr/bin/python
#-*- coding:utf-8 -*-
import sys
import threading

import time

import signal


gl_running = True

class TaskThread(threading.Thread):

    def __init__(self, cnt):
        threading.Thread.__init__(self)
        self.cnt = cnt
        self.running = True

    def run(self):
        global gl_running

        while gl_running:
            time.sleep(1)
            print("cnt = %d\n" % self.cnt)
            self.cnt = self.cnt - 1

            if self.cnt <= 0:
                break

        print('task thread exit!\n')


def handle_exit(signum, frame):
    global gl_running

    gl_running = False
    print('catched interrupt signal!\n')


if __name__ == "__main__":
    task = TaskThread(20)
    task.start()

    signal.signal(signal.SIGINT, handle_exit)
    signal.signal(signal.SIGTERM, handle_exit)

    while gl_running:
        time.sleep(1)


    print('Main Process Exit\n')

log为:

E:\python\work\thread_t1>python thread_test1.py
cnt = 20

cnt = 19

cnt = 18

cnt = 17

catched interrupt signal!

Main Process Exit

cnt = 16

task thread exit!