Issue 6933: Threading issue with Tkinter Frame.insert (original) (raw)
Created on 2009-09-17 17:01 by moraygrieve, last changed 2022-04-11 14:56 by admin. This issue is now closed.
Messages (6)
Author: Moray Grieve (moraygrieve)
Date: 2009-09-17 17:00
The attached file has an example where a Tk GUI is launched as a seperate thread - this all works fine in Python 2.5, but in Python 2.6 the thread hangs.
The issue seems to be in the line;
self.messageBoxDetails.insert(INSERT, "Hello world")
Comment this line out, or use an empty string rather than "Hello World", and the example works in both Python 2.5 and Python 2.6. I have not been able to seen any related issues to this and wonder if this is a bug in the 2.6 Tkinter module.
Author: Moray Grieve (moraygrieve)
Date: 2009-09-17 17:04
I should say this is running on Windows XP
Author: Ramchandra Apte (Ramchandra Apte) *
Date: 2012-11-03 15:47
Bump.
Author: Serhiy Storchaka (serhiy.storchaka) * 
Date: 2013-01-15 16:34
Tkinter as perhaps any other GUI library must be used only from one thread.
Author: Terry J. Reedy (terry.reedy) *
Date: 2013-03-08 21:53
Quoting from on #16823, which I turned into a doc issue: ''' What you are doing appears to be unsupported (invalid). From http://www.astro.washington.edu/users/rowen/TkinterSummary.html "all Tkinter access must be from the main thread (or more precisely, from the thread that calls the mainloop). Violating this is likely to cause nasty and mysterious symptoms such as freezes and core dumps." ''' You got the freeze part. I suspect what changed from 2.5 to 2.6 was the tcl/tk version delivered with Python on Windows.
Author: Terry J. Reedy (terry.reedy) *
Date: 2018-05-13 04:56
I changes the import to theading instead of thread and the start line to threading.Thread(target=example) On 3.7 with tcl/tk 8.6 with thread support, I see the gui when mainloop is called in the thread, and then the >>> prompt appears. On 2.7 with tk 8.5 without thread support, I see no hang but only >>>, no box, after the same time delay.
With thread support, thread calls work. Without, success varies, and so do failure modes. See #33479 for proposed doc on tkinter and thread safety.
History
Date
User
Action
Args
2022-04-11 14:56:53
admin
set
github: 51182
2018-05-13 04:56:37
terry.reedy
set
messages: +
2013-03-08 21:53:48
terry.reedy
set
status: open -> closed
resolution: not a bug
messages: +
stage: resolved
2013-01-15 16:34:00
serhiy.storchaka
set
nosy: + terry.reedy, serhiy.storchaka
messages: +
2012-11-03 15:47:34
Ramchandra Apte
set
nosy: + Ramchandra Apte
messages: +
2009-09-17 17:04:23
moraygrieve
set
messages: +
2009-09-17 17:01:00
moraygrieve
create