Closing pexpect connections in threads

I am trying to write a multi-threaded program and use pexpect along with it. All works fine until I try to close the connection handle. That thread keeps waiting until the connection handle closes. It actually never comes out of that command. If I manually kill it using kill command, the thread comes out and quits otherwise it is in the wait state forever.

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 def daemon(self):

        self.continue_hearbeats_lock.acquire()

        self.continue_heartbeats = True

        self.continue_hearbeats_lock.release()

        thrdHandshake = threading.Event()
 
       threading.Thread(target=self.RunTests,name='Run_Test_Thread')

       while self.continue_heartbeats:

            pass 
 
def RunTests(self):

     self.createconnection() 

     self.closeconnection() 
 
def closeconnection()

   self.log("Closign connection for device")

   self.connection_handle.close()

And upon running, it hangs at this point
11:8:17:910 [DBG][CLEANUP]
11:8:17:910 [DBG]Closing Connection for device
<pexpect.spawn instance at 0xb7b373cc>

Any tips on what I am missing here?

Oct 3 '07 #1

Subscribe Post Reply

3849

indianteam

Any hints yet or do you think I am missing something ?

I tried the same program with fork and it seemed to work fine. So If fork is my only hope then what modules do I need to use for communication between multiple processes within the same program. Is sub-processes a good bet ?

Thanks.

Oct 4 '07 #2

bartonc

6,596

Expert 4TB

Any hints yet or do you think I am missing something ?

I tried the same program with fork and it seemed to work fine. So If fork is my only hope then what modules do I need to use for communication between multiple processes within the same program. Is sub-processes a good bet ?

Thanks.

Sorry. I haven't had time to get to this one. I have some ideas, but currently have a deadline to meet. I'll try to get some time this afternoon.

Oct 4 '07 #3

indianteam

Thanks barton.

Ok I have come up with one solution which is definitely not elegant. Just wanted to share with the experts and get their opinions.

Whenever I create a pexpect session, I get the PID of that session and store it in a global list. The parent function which initializes all the threads waits until all the threads are finished and then it grabs the global list and starts killing them using the <kill -9 pid>

Any better solutions ?

Oct 5 '07 #4

bartonc

6,596

Expert 4TB

Thanks barton.

Ok I have come up with one solution which is definitely not elegant. Just wanted to share with the experts and get their opinions.

Whenever I create a pexpect session, I get the PID of that session and store it in a global list. The parent function which initializes all the threads waits until all the threads are finished and then it grabs the global list and starts killing them using the <kill -9 pid>

Any better solutions ?

Sounds reasonable to me. I guess that the methods discussed in this thread don't apply to your pexpect situation?

Oct 5 '07 #5

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