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From: MRAB on 4 Jun 2010 10:52
Alan wrote:
> Hi there,
>
> That's another try to get help about this issue I am facing. To help you
> to help me here goes a simple example. This is a very simplification of
> a very complex code.
>
> -------------------- thread_ping.py -------------------- begin
> import time
> import sys
> import atexit
> from threading import Thread
>
> class testit(Thread):
> def __init__ (self,ip):
> Thread.__init__(self)
> self.ip = ip
> self.status = 0
> def run(self):
> pingaling = os.popen("ping -q -c2 "+self.ip,"r")
> while 1:
> line = pingaling.readline()
> if not line: break
> igot = re.findall(testit.lifeline,line)
> if igot:
> self.status = int(igot[0])
>
> def goodbye(t, report):
> print 'Goodbye'
> print "Status from ",t.ip,"is",report[t.status]
>
> testit.lifeline = re.compile(r"(\d) packets received")
> report = ("No response","Partial Response","Alive")
>
> ip = "209.85.227.104" # www.google.com <http://www.google.com> # try
> with a failing IP if you want the test to last a bit longer
>
> t = testit(ip)
>
> atexit.register(goodbye, t, report)
>
> t.start()
>
> exit()
> -------------------- thread_ping.py -------------------- end
>
> If one runs like:
>
> amadeus[2579]:~/TMP% time python2.6 thread_ping.py
> Goodbye
> Status from 209.85.227.104 is Alive
> python2.6 thread_ping.py 0.02s user 0.02s system 3% cpu 1.056 total
>
> (i.e., python2.6 wait till the thread finishes and leave... I don't want
> this behaviour, see below)
>
> and
>
> amadeus[2580]:~/TMP% time python2.5 thread_ping.py
> Goodbye
> Status from 209.85.227.104 is No response
> python2.5 thread_ping.py 0.01s user 0.01s system 90% cpu 0.030 total
>
> (i.e., python2.5 promptly quit, as desired)
>
> Could someone tell me how to get python2.6 to have the same behaviour I
> see with python2.5 for this example code?
>
> Any hint would be very much appreciated indeed.
>
> Many thanks in advance.
>
The script won't exit while there are non-daemon threads running. You
can make a thread a daemon by setting its 'daemon' attribute to True
before starting the thread. If you want the script to be backwards
compatible with Python 2.5 then use the 'setDaemon' method instead.

I don't know why the script exited in Python 2.5 even though a
non-daemon thread was still running.
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