Re: GUI freezes waiting for callback function to return

[Federico Zamperini <fzamperini tiscali it>]

I suggest you to read these interesting pages:

http://blog.borovsak.si/2009/06/multi-threaded-gtk-applications.html
http://blogs.operationaldynamics.com/andrew/software/gnome-desktop/gtk-thread-awareness

Warning: gdk_threads_enter has been deprecated since version 3.6 and 
should not be used in newly-written code. All GDK and GTK+ calls should 
be made from the main thread.
Nevertheless I find those pages useful.

Since I'm lazy I've used this approach 
(gdk_threads_enter/gdk_threads_leave) to change the gui layout from a 
secondary thread instead of using proper thread synchronization, I mean 
like using some kind of inter-thread communication, for example 
(asynchronous) queues 
(http://developer.gnome.org/glib/2.31/glib-Asynchronous-Queues.html#glib-Asynchronous-Queues.description) 
or (gtk)signal emitting to make the main thread execute a callback -- 
the same way when a gui button is pressed.
Unfortunately I use C, not Python, so these are just pointers.

Il 14/12/2012 04:04, Andrew Potter ha scritto:
> On Thu, Dec 13, 2012 at 5:57 AM, Mateusz Marzantowicz <
> mmarzantowicz osdf com pl> wrote:
>
> > My application is supposed to do some extensive file operations which
> >   may take a while depending on number of files.
>
>
> If you don't want to offload your work to another thread, Glib has a whole
> host of asynchronous file handling operations. I guess the python
> documentation is here:
> http://www.pygtk.org/docs/pygobject/gio-class-referenandce.html<http://www.pygtk.org/docs/pygobject/gio-class-reference.html>
>
> I prefer to use threading of some kind and I'm little bit disappointed that
> > GTK+ doesn't offer that out of the box for menus, actions and callbacks.
>
> AFAIK Windows and Android requires GUI functions to be called on the main
> loop thread, so it is not unusual. Also, since GTK+ is supposed to work on
> Windows it inherits that rule. You should be able to create a thread or
> call whatever threading library you want from your callback, but if you
> want to deliver results back to the GUI it has to be done back on the main
> thread.
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