转自: http://www.jb51.net/article/71908.htm
由于python线程没有提供abort方法,所以我们需要自己想办法解决此问题,面对这一问题,小编帮大家解决phthon杀死一个线程的方法,需要的朋友一起来学习吧。
最近在项目中遇到这一需求:
我需要一个函数工作,比如远程连接一个端口,远程读取文件等,但是我给的时间有限,比如,4秒钟如果你还没有读取完成或者连接成功,我就不等了,很可能对方已经宕机或者拒绝了。这样可以批量做一些事情而不需要一直等,浪费时间。
结合我的需求,我想到这种办法:
1、在主进程执行,调用一个进程执行函数,然后主进程sleep,等时间到了,就kill 执行函数的进程。
测试一个例子:
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import time import threading def p(i): print i class task(threading.Thread): def __init__( self ,fun,i): threading.Thread.__init__( self ) self .fun = fun self .i = i self .thread_stop = False def run( self ): while not self .thread_stop: self .fun( self .i) def stop( self ): self .thread_stop = True def test(): thread1 = task(p, 2 ) thread1.start() time.sleep( 4 ) thread1.stop() return if __name__ = = '__main__' : test() |
经过测试只定了4秒钟。
经过我的一番折腾,想到了join函数,这个函数式用来等待一个线程结束的,如果这个函数没有结束的话,那么,就会阻塞当前运行的程序。关键是,这个参数有一个可选参数:join([timeout]): 阻塞当前上下文环境的线程,直到调用此方法的线程终止或到达指定的timeout(可选参数)。
不多说了贴下面代码大家看下:
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#!/usr/bin/env python #-*-coding:utf-8-*- ''''' author:cogbee time:2014-6-13 function:readme ''' import pdb import time import threading import os #pdb.set_trace() class task(threading.Thread): def __init__( self ,ip): threading.Thread.__init__( self ) self .ip = ip self .thread_stop = False def run( self ): while not self .thread_stop: # //添加你要做的事情,如果成功了就设置一下 # <span style="font-family: Arial, Helvetica, sans-serif;">self.thread_stop变量。</span> # [python] view plaincopy在CODE上查看代码片派生到我的代码片 if file ! = '': self .thread_stop = True def stop( self ): self .thread_stop = True def test(eachline): global file list = [] for ip in eachline: thread1 = task(ip) thread1.start() thread1.join( 3 ) if thread1.isAlive(): thread1.stop() continue #将可以读取的都存起来 if file ! = '': list .append(ip) print list if __name__ = = '__main__' : eachline = [ '1.1.1.1' , '222.73.5.54' ] test(eachline) |
下面给大家分享我写的一段杀死线程的代码。
由于python线程没有提供abort方法,分享下面一段代码杀死线程:
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import threading import inspect import ctypes def _async_raise(tid, exctype): """raises the exception, performs cleanup if needed""" if not inspect.isclass(exctype): raise TypeError( "Only types can be raised (not instances)" ) res = ctypes.pythonapi.PyThreadState_SetAsyncExc(tid, ctypes.py_object(exctype)) if res = = 0 : raise ValueError( "invalid thread id" ) elif res ! = 1 : # """if it returns a number greater than one, you're in trouble, # and you should call it again with exc=NULL to revert the effect""" ctypes.pythonapi.PyThreadState_SetAsyncExc(tid, 0 ) raise SystemError( "PyThreadState_SetAsyncExc failed" ) class Thread(threading.Thread): def _get_my_tid( self ): """determines this (self's) thread id""" if not self .isAlive(): raise threading.ThreadError( "the thread is not active" ) # do we have it cached? if hasattr ( self , "_thread_id" ): return self ._thread_id # no, look for it in the _active dict for tid, tobj in threading._active.items(): if tobj is self : self ._thread_id = tid return tid raise AssertionError( "could not determine the thread's id" ) def raise_exc( self , exctype): """raises the given exception type in the context of this thread""" _async_raise( self ._get_my_tid(), exctype) def terminate( self ): """raises SystemExit in the context of the given thread, which should cause the thread to exit silently (unless caught)""" self .raise_exc(SystemExit) |
使用例子:
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>>> import time >>> from thread2 import Thread >>> >>> def f(): ... try : ... while True : ... time.sleep( 0.1 ) ... finally : ... print "outta here" ... >>> t = Thread(target = f) >>> t.start() >>> t.isAlive() True >>> t.terminate() >>> t.join() outta here >>> t.isAlive() False |
试了一下,很不错,只是在要kill的线程中如果有time.sleep()时,好像工作不正常,没有找出真正的原因是什么。已经是很强大了。哈哈。