Jackmoo added the comment:
Hi there, recently I also encounter this in windows(7), and my python program
occasionally crash and the windows pops 'appcrash' message with tcl8.5.dll
error c000005 (access violation).
And this end up related to thread safe problem described as above. Since in my
program, I have to build the tkinter UI in another thread (main thread was
occupied by other module which blocking), so I can't follow the 'build UI in
main thread' solution. My work around is, add a handler which using .after()
and get_nowait() to call itself periodically to handle the command in queue.
def commandQueueHandler(self):
try:
while 1:
your_command = self.textCommandQueue.get_nowait()
if your_command is not None:
# execute the command ....
self.Text.update_idletasks()
except Queue.Empty:
pass
self.Text.after(100, self.commandQueueHandler)
Once this method is triggered, just build another thread to put() command in
textCommandQueue, then it will be executed periodically.
One thing that should mention is the update_idletasks() should be added after
each command execution, otherwise the UI refresh will be slower then expected.
(in my case, the scrolling of Text widge is a bit 'sticky' when I pull it.
After adding update_idletasks(), it becomes smoother.)
TL:DR,
If you have to run tkinter UI in another thread, add a queue and self-called
method with after() and get_nowait() in UI thread to handle the queue. If you
want to send command to UI at other thread, just put() the command in the queue
of UI thread.
----------
nosy: +Jackmoo
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue11029>
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