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Subject: Re: How to interrupt a task which is running in a thread?
From: Arjen Markus <arjen.markus...@gmail.com>
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On Wednesday, September 26, 2012 11:56:27 AM UTC+2, Andy wrote:
> Hi Arjen
>=20
>=20
>=20
> Thanks for your reply.
>=20
> I have a Tk GUI app. There are "Start" and "Stop" buttons on my GUI. Afte=
r pressing "Start" button, my app will execute a command in a thread, maybe=
 copy a large file. It will take a long time. At the moment, I want to pres=
s "Stop" button to stop this action immidiately. And then, I can press "Sta=
rt" button to copy that file again. This is what I want. Do you have any id=
ea? Or is there another way to achieve this?

There is no general way in which you can achieve that, as far as I know.=20
The only thing I can think of is that the task itself cooperates with you.
That is, if you take the copying example:
Some procedure copies chunks and looks regularly if it should continue.
If it sees it should interrupt the work, it saves whatever state needs savi=
ng
and returns control.

One possible mechanism to make this easier is the use of coroutines, but ev=
en
they require cooperation.

Perhaps http://wiki.tcl.tk/1526 holds some ideas you can use.

Regards,

Arjen