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Re: Python Tkinter after method silently exits (corrected)
- From: Steve Ward <ward at mit dot edu>
- To: Steve Ward <ward at MIT dot EDU>
- Cc: cygwin at cygwin dot com
- Date: Mon, 20 Feb 2006 08:14:30 -0500
- Subject: Re: Python Tkinter after method silently exits (corrected)
- References: <43F9B904.email@example.com> <43F9BEDE.firstname.lastname@example.org>
[Sorry for the spam; a paste bug omitted imports
from the original program. I've consolidated my
previous 2 emails here; please ignore the earlier
On upgrading to the latest 1.5.19-4 cygwin release, I
find that several previously working python programs
began mysteriously exiting. I've boiled the problem
down to a skeletal test program (attached), which runs
under the prior 1.5.18-1 release but exits under 1.5.19-4.
The second thread seems necessary to stimulate the failure;
even commenting out the sleep(100) to make it return
immediately avoides the spurious exit. When the second
thread is running, the self.root.after(...) call
apparently causes a silent exit rather than returning.
I'm using python 2.4.1 (the
current cygwin distribution) in both cases. The test
program fails with a current, up-to-date cygwin setup;
downgrading ONLY cygwin1.dll to 1.5.18-1 causes it to
work, suggesting that the problem is with cygwin1.dll
rather than with python.
Any help/ideas would be appreciated...
- Steve Ward
# Demonstrate python/Tkinter threading bug
import sys, types, os, threading
import Tkinter as TK
from time import sleep
def __init__(self, root):
self.root = root
# Start a second thread, to do whatever...
self.thread = threading.Thread(target=self.second_thread)
print >>sys.stderr, "*** update_loop"
if __name__ == "__main__":
root = TK.Tk()
app = App(root)
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