python多线程下的信号处理程序示例

下面是一个网上转载的实现思路，经过验证，发现是可行的，就记录下来。

思路

python多线程中要响应Ctrl+C的信号以杀死整个进程，需要：
1.把所有子线程设为Daemon；

2.使用isAlive()函数判断所有子线程是否完成，而不是在主线程中用join()函数等待完成；

3.写一个响应Ctrl+C信号的函数，修改全局变量，使得各子线程能够检测到，并正常退出。

源码

#!/usr/bin/env python
#encoding: utf-8
#filename: signal_demo.py

import threading, signal

def do_job(i, step):
global exited
idx = i
while not exited:
if(idx < 10000000):
print 'thread[%d]: idx=%d' % (i, idx)
idx = idx + step
else:
break
if exited:
print 'receive a signal to exit, thread[%d] stop.' % i
else:
print 'thread[%d] complete.' % i

def sig_handler(sig, frame):
global exited
exited = True
print 'receive a signal %d, exited=%d' % (sig, exited)

def main():
#set signal handler
signal.signal(signal.SIGTERM, sig_handler)
signal.signal(signal.SIGINT, sig_handler)
pool = []
pool_size = 50
for i in range(pool_size):
t = threading.Thread(target = do_job, args = (i, pool_size))
t.setDaemon(True)
pool.append(t)
t.start()
while 1:
alive = False
for i in range(pool_size):
alive = alive or pool[i].isAlive()
if alive == True:
break
if not alive:
break

if __name__ == '__main__':
exited = False
main()

命令行运行

python signal_demo.py

截图






参考文献

[1]./article/1280797.html