Re: [gtk-list] Long non-GUI tasks

[Emmanuel Varagnat <coredump free fr>]

Try gtk_widget_show_now...

lightmanaj@earthlink.net a écrit :
> 
> Hi all,
> 
> I'm faced with a potentially sticky situation. I need to make an API
> call to an external library which may possibly last on the order of
> magnitude of seconds to minutes. I do not maintain this library, so
> I can't place any gtk_main_iteration() calls anywhere *within* the
> library function in question.
> 
> So my plan was to open a small progress box and display a
> message, indicating that this will take some time. However, if I call
> the function immediately after showing the progress box using
> gtk_widget_show(), the contents of the box are not displayed! I
> tried doing something like:
> 
>         for (i = 1; i < 100; i++)
>         {
>                 gtk_main_iteration();
>         }
> 
> but this causes the program to freeze every once in a while. I also
> tried:
> 
>         while (gtk_events_pending())
>         {
>                 gtk_main_iteration();
>         }
> 
> but the contents still don't appear on the dialog box, even though
> I've shown the box before I've shown the window.
> 
> Is there a way to handle this situation in a clean way? I tried
> looking into GNU Pth for possible threading means, but it does not
> support preemptive threads (otherwise this problem won't be
> solved).
> 
> Thanks,
> --Arthur

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