Threaded Tkinter

Michael Muller mike at proteus.dialup.cloud9.net
Fri Jun 4 16:42:35 CEST 1999


On Thu, 3 Jun 1999 gutier at intergate.bc.ca wrote:

> 
> Hi Michael.
> 
> I just went through your code and tried it out. I think I understand
> what it does now. Thanks for posting it.
> 
> For what I would really like to eventually do (processing network
> activity on a separate thread and updating it on a UI), I still need
> to signal a change in UI from another thread. The poll works but, as
> you obviously know, it is suboptimal. What would be best is if one
> could inject a message into Tk's event queue to cause it to
> immediately call a function, which would read a queue and do
> something.
> 
> I understand there is an "event" command in Tk, but I know nothing
> about it. Do you think it would be helpful?
[snip]

You can generate custom events under Tkinter, but I think you're going to run
into the same problem with the Tkinter lock: the function that sends the
event is going to block on the Tkinter lock for as long as the main thread
is in the message queue.

>From what I've seen of the Tkinter main loop, there are facilities for
obtaining events from sources other than the window event queue,
unfortunately I don't know how to use them.

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