[ltk-user] fix for ltk on mswin?

Peter Herth herth at peter-herth.de
Thu Feb 18 20:36:12 UTC 2010

Hmm, Windows is strange :). But your explanation is the best I have
heard for the windows problems so far... so I added

 #+mswindows (sleep 1)

The waiting for a prompt has only one problem - tcl doesn't send a prompt when
run as a subprocess.


On Wed, Feb 10, 2010 at 5:20 AM,  <dherring at tentpost.com> wrote:
> There have been many reports of ltk not starting properly on mswin boxes.
> I have an XP box that consistently shows this problem.  The basic symptom
> is that when tk should appear, the active titlebar is grayed out but
> nothing else happens.  When the lisp process is closed, the tk window full
> of ltk widgets appears.
> A few years ago, there were a couple reports on this list containing
> workarounds.  However, I couldn't get any of them to work.
> After poking at this for a long time, I came up with the following patch.
> I can't guarantee 100% success, but it hasn't failed and it points to a
> possible obscure problem in ltk.
>   ;; open subprocess
>   (if (null (wish-stream *wish*))
>       (progn
> -       (setf (wish-stream *wish*) (or stream (do-execute *wish-pathname*
> *wish-args*))
> +       (setf (wish-stream *wish*) (or stream (do-execute *wish-pathname*
> *wish-args*)))
> +       (sleep 1)
> +       (setf
>              (wish-call-with-condition-handlers-function *wish*)
>              (apply #'make-condition-handler-function keys))
>        ;; perform tcl initialisations
> Basically, it appears to me that due to scheduler timing, ltk may be
> writing to wish before it is ready, somehow causing the wish gui event
> loop to hang.  The (sleep 1) is sketchy, but would it be hard to have ltk
> wait until it reads a wish prompt?  ISTR there was a reason why this is a
> common pattern in expect.
> Thanks,
> Daniel
> P.S.   Need... sleep....z.z.z.z.zzzzzzz
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