collecting ping replies using threads

32 New Member

Hi,

I would like to know why my string below(in bold) does provide only 1 result but should provide more result from a ping due that I put several IPs from a list to be ping ? ( this string filters the (% loss) from a ping command).

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class testit(Thread):

   def __init__ (self,ip):

      Thread.__init__(self)

      self.ip = ip

      self.status = -1

   def run(self):

      pingaling = os.popen("ping "+self.ip+" -n 10 ","r")
 
# This code is what each parallel thread does

# the 'run' method is triggered when 'start' is called

      while 1:

         line = pingaling.read()

         startopenbracket = line.find("(")   #<-----??????????????

         startloss = line.find("loss")

         print line[startopenbracket+1:startloss]         

         if not line: break

Sep 18 '07 #1

Subscribe Reply

2086

bartonc

6,596

Recognized Expert Expert

It's probably

Expand|Select|Wrap|Line Numbers

if not line: break

Which will be true when read() returns and empty result. Your code will execute many times before read() will return the next good result (I think).

Sep 18 '07 #2

Charlie of Bolton

New Member

Hi,

Any suggestion on how on to modified this code : ( if not line: break )
to provided me all the IPs stats displayed on the Python Idle ?

Tks

Sep 19 '07 #3

bartonc

6,596

Recognized Expert Expert

Hi,

Any suggestion on how on to modified this code : ( if not line: break )
to provided me all the IPs stats displayed on the Python Idle ?

Tks

For threads, it's best to let them run in their loops until the main thread tells them to stop. Here's a quick example that I whipped up recently:

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 import time

import threading
 
def FuncToRunAsThread(event):

    print "started at %f" %time.time()

    while not event.isSet():

        pass  #do some work until the main thread sets the event

    print "stopped at %f" %time.time()
 
if __name__ == "__main__":

    thrdHandshake = threading.Event()

    workerThread = threading.Thread(target=FuncToRunAsThread, args=(thrdHandshake,))

    workerThread.start()

    print workerThread.isAlive()

    time.sleep(5)

    thrdHandshake.set()  # Set the handshake flag that will terminate the thread

    workerThread.join()  # wait here until the thread is actually terminated

    print workerThread.isAlive()  # without the previous line, isAlive() will usually? be true

    print "main thread terminated at %f" %time.time()

Sep 19 '07 #4

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collecting ping replies using threads

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