[英]Unable to stop running Python thread
I have an application listening on a specific TCP port to handle received requests ( listen.py
). 我有一个应用程序在特定的TCP端口上侦听,以处理接收到的请求(
listen.py
)。 After that, I have another one ( trigger.py
) that depending on the requested parameters triggers the respective operation. 之后,我还有另一个(
trigger.py
),它根据请求的参数触发相应的操作。
Now, lets say the operation A was triggered ( opA.py
). 现在,假设操作A已触发(
opA.py
)。 Operation A uses a worker thread to start ( worker.py
). 操作A使用辅助线程来启动(
worker.py
)。 When the user request listen.py
to stop operation A, the started thread is supposed to stop. 当用户请求
listen.py
停止操作A时,应该停止启动的线程。
UPDATED: 更新:
The problem is that the thread is never stopped since the problem lies in trigger.py
. 问题在于线程永远不会停止,因为问题出在
trigger.py
。 The OperationA instance is lost once the code exits. 代码退出后,OperationA实例将丢失。 So, I can never call stopOperation since it show me
AttributeError: 'NoneType' object has no attribute 'stopOperation'
因此,我永远无法调用stopOperation,因为它显示了
AttributeError: 'NoneType' object has no attribute 'stopOperation'
Any ideas of How to solve this? 关于如何解决这个问题的任何想法?
listen.py listen.py
from trigger import Trigger
'''
code to handle requests here:
1st: param -> 'start'
2nd: param -> 'stop'
'''
t = Trigger()
t.execute(param)
trigger.py trigger.py
from opA import OperationA
class Trigger():
def execute(param):
opA = OperationA()
if param == 'start':
opA.startOperation()
elif param == 'stop':
opA.stopOperation()
opA.py opA.py
from worker import ThreadParam
class OperationThread(ThreadParam):
def run(self):
while (self.running == False):
'''
do something here
'''
class OperationA():
def _init__(self):
listenThread = OperationThread(self)
def startOperation(self):
self.listenThread.start()
def stopOperation(self):
if self.listenThread.isAlive() == True:
print 'Thread is alive'
self.listenThread.killSignal()
else:
print 'Thread is dead'
worker.py worker.py
from threading import Thread
class ThreadParam(Thread):
def __init__(self, _parent):
Thread.__init__(self)
self.parent = _parent
self.running = False;
def killSignal(self):
self.running = True;
A minimal useful Trigger
might look like this: 最小有用的
Trigger
可能看起来像这样:
class Trigger(object):
def __init__(self):
self.operation = None
def execute(self, command):
if command == 'start':
assert self.operation is None
self.operation = OperationA()
self.operation.start_operation()
elif command == 'stop':
self.operation.stop_operation()
self.operation = None
else:
print 'Unknown command', repr(command)
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