[Tkinter-discuss] Tkinter and Threads

Douglas S. Blank Fri, 04 Feb 2005 15:44:11 -0800

Hi, I'm running some Tkinter code that works fine on some machines, but doesn't on others. The error I get is:

  ...
  File "/usr/lib/python2.3/lib-tk/Tkinter.py", line 2066, in create_oval
    return self._create('oval', args, kw)
  File "/usr/lib/python2.3/lib-tk/Tkinter.py", line 2049, in _create
    return getint(self.tk.call(
RuntimeError: main thread is not in main loop

This code works under Fedora Core 2, Python 2.3.3 with Tkinter 1.177, but doesn't under Debian, Python 2.3.4, with Tkinter 1.177. I see that the error is raised in _tkinter.c because the Tk interpreter is in a different thread from where I am attempting to run this code.

The questions: is this error dependent on whether Tkinter was compiled with or without threads? If so, is there a way I can, via Python, find out the method Tkinter was compiled? Is there a workaround for this problem (short of rewriting my code)? Will going to Python 2.4 alter this behavior?

The situation is that I create a canvas in a thread, and have another thread running that calls a callback that updates the canvas.

Thanks for any hints!

-Doug

--
Douglas S. Blank,         Assistant Professor
[EMAIL PROTECTED],            (610)526-6501
Bryn Mawr College,   Computer Science Program
101 North Merion Ave,       Park Science Bld.
Bryn Mawr, PA 19010  dangermouse.brynmawr.edu
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[Tkinter-discuss] Tkinter and Threads

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