Hello!
I am trying to terminate a Popen session using Popen.terminate() ( using
the info at http://docs.python.org/library/subprocess.html and some
relevant answers from Stack Overflow). But it doesn't seem to work for me.
I am calling Popen to run a command (which runs for a long time) from one
thread (thread1) and trying to stop the execution from another thread
(thread2) which is running in a loop. In response to a pushButton, the
second thread (thread2) invokes the stop method of the first thread which
in turn, invokes the terminate() call.
Here is the code snippet:
class thread1(threading.Thread):
def __init__(self, ....):
...
...
super(bcThread_allrep_all, self).__init__()
self.stoprequest = threading.Event()
self.process = None
def stopped(self):
return self.stoprequest.isSet()
def run(self):
(process, err) = Popen(self.fwcmd, stdout=PIPE,
stderr=PIPE).communicate() if len(err) > 0:
# print("Error")
# Error handling code
else:
# print("Success")
def stop(self):
if self.process is not None:
print("TERMINATING THREAD")
self.process.terminate()
#Popen.terminate(self.process)
else:
print("process IS NONE ")
>From thread2 I am invoking thread1.stop() method, in order to terminate
the Popen call. So thread1.stop() is getting invoked, but I see that
self.process (which is the value Popen has to return) will have "None"
before it finishes.
The python.org document suggests to use Popen.terminate() call.
So I also tried calling Popen.terminate (as in the commented line above),
but it returns the following error (due to the same reason that
self.process is None):
File "bc_reports_tab.py", line 1733, in stop
Popen.terminate(self.process)
File "/usr/lib/python3.2/subprocess.py", line 1581, in terminate
self.send_signal(signal.SIGTERM)
AttributeError: 'NoneType' object has no attribute 'send_signal'
So how would I terminate Popen before it has finished executing??
Appreciate any help.
Thanks!
-Sm
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