python杀死一个线程的方法

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:

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:

#!/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self.thread_stop变量。
[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:

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:

>>> 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。

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