线程忽略KeyboardInterrupt异常 [英] threading ignores KeyboardInterrupt exception

问题描述

我正在运行我的简单代码：

 导入线程，时间
 
 class reqthread （threading.Thread）：
 def __init__（self）：
 threading.Thread .__ init __（self）
 
 def run（self）：
 for i in range （0,10）：
 time.sleep（1）
 print'。'
 
 try：
 thread = reqthread（）
 thread.start （）
 except（KeyboardInterrupt，SystemExit）：
 print'\\\
！接收到键盘中断，退出threads.\\\
'
  

但是当我运行它时，它打印

  $ python prova.py 
`
。 
。 
 ^ C。 
。 
。 
。 
。 
。 
。 
。 
从< module'threading'from'/usr/lib/python2.6/threading.pyc'>中的异常KeyboardInterrupt;忽略
`
  

其实python线程忽略我的 Ctrl + C 键盘中断，不打印接收到的键盘中断。为什么？这个代码有什么问题？

解决方案

尝试

  try：
 thread = reqthread（）
 thread.daemon = True 
 thread.start（）
 while True：time.sleep（100）
除了（KeyboardInterrupt，SystemExit）：
打印'\\\
！收到键盘中断，退出线程。\ $'
  

没有调用 time.sleep ，主要过程是跳出 try ...除了块太早，所以$ code KeyboardInterrupt 未被捕获。我的第一个想法是使用 thread.join ，但是似乎阻止主程序（忽略KeyboardInterrupt），直到线程完成。

thread.daemon = True 导致线程在主进程结束时终止。 p>

I'm running this my simple code:

import threading, time

class reqthread ( threading.Thread ):
  def __init__ (self):
    threading.Thread.__init__(self)

  def run ( self ):
    for i in range(0,10):
      time.sleep(1)
      print '.'

try:
  thread=reqthread()
  thread.start()
except (KeyboardInterrupt, SystemExit):
  print '\n! Received keyboard interrupt, quitting threads.\n'

But when i run it, it prints

$ python prova.py  
`
.
.
^C.
.
.
.
.
.
.
.
Exception KeyboardInterrupt in <module 'threading' from '/usr/lib/python2.6/threading.pyc'> ignored
`

In fact python thread ignore my Ctrl+C keyboard interrupt and doesn't print Received Keyboard Interrupt. Why? What is wrong with this code?

解决方案

Try

try:
  thread=reqthread()
  thread.daemon=True
  thread.start()
  while True: time.sleep(100)
except (KeyboardInterrupt, SystemExit):
  print '\n! Received keyboard interrupt, quitting threads.\n'

Without the call to time.sleep, the main process is jumping out of the try...except block too early, so the KeyboardInterrupt is not caught. My first thought was to use thread.join, but that seems to block the main process (ignoring KeyboardInterrupt) until the thread is finished.

thread.daemon=True causes the thread to terminate when the main process ends.

这篇关于线程忽略KeyboardInterrupt异常的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！