轉自: http://www.jb51.net/article/71908.htm
由於python線程沒有提供abort方法,所以我們需要自己想辦法解決此問題,面對這一問題,小編幫大家解決phthon殺死一個線程的方法,需要的朋友一起來學習吧。
最近在項目中遇到這一需求:
我需要一個函數工作,比如遠程連接一個端口,遠程讀取文件等,但是我給的時間有限,比如,4秒鍾如果你還沒有讀取完成或者連接成功,我就不等了,很可能對方已經宕機或者拒絕了。這樣可以批量做一些事情而不需要一直等,浪費時間。
結合我的需求,我想到這種辦法:
1、在主進程執行,調用一個進程執行函數,然后主進程sleep,等時間到了,就kill 執行函數的進程。
測試一個例子:
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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()
|
經過測試只定了4秒鍾。
經過我的一番折騰,想到了join函數,這個函數式用來等待一個線程結束的,如果這個函數沒有結束的話,那么,就會阻塞當前運行的程序。關鍵是,這個參數有一個可選參數:join([timeout]): 阻塞當前上下文環境的線程,直到調用此方法的線程終止或到達指定的timeout(可選參數)。
不多說了貼下面代碼大家看下:
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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,如果成功了就設置一下
# <span style="font-family: Arial, Helvetica, sans-serif;">self.thread_stop變量。</span>
# [python] view plaincopy在CODE上查看代碼片派生到我的代碼片
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
#將可以讀取的都存起來
if
file
!
=
'':
list
.append(ip)
print
list
if
__name__
=
=
'__main__'
:
eachline
=
[
'1.1.1.1'
,
'222.73.5.54'
]
test(eachline)
|
下面給大家分享我寫的一段殺死線程的代碼。
由於python線程沒有提供abort方法,分享下面一段代碼殺死線程:
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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
|
試了一下,很不錯,只是在要kill的線程中如果有time.sleep()時,好像工作不正常,沒有找出真正的原因是什么。已經是很強大了。哈哈。