Re: Threads and gtk_widget_show (code should not be reached?)

[Edscott Wilson <edscott wilson garcia gmail com>]

BTW, g_main_context_invoke() will be erratic if you do not have the main
context loop running. This is common at startup, when you do all sort of
gtk_xx before entering the main loop. Solution: start the loop as soon as
possible in the main thread, and anything else the main thread needs to do,
put in a g_idle function.

2013/1/30 Edscott Wilson <edscott wilson garcia gmail com>

> The current method for calling gtk_xx instructions is from the main thread
> only (i.e., that which owns the main loop context). You can do this by
> means of g_main_context_invoke(). Otherwise you must use the deprecated
> gdk_threads_enter/gdk_threads_leave mutex method. The deprecated method is
> slower.
>
> If you do not do the above, you will get all sort of errors just like the
> one you describe.
>
> HTH
>
>
> 2013/1/30 Ferdinand Ramirez <ramirez ferdinand yahoo com>
>
> > I have encountered a strange error followed by a crash when I add the
> > following object to a GtkTextView by creating a child anchor and call
> > gtk_widget_show_all.
> >
> > The object that is added
> >
> > The object that is added to the child anchor is a GtkFrame inside which
> > is a GtkTable and each cell of the table contains another GtkFrame each of
> > which contains a GtkTextView.
> >
> > The error
> >
> > This works fine if it is all done from the main program. However, when I
> > create the hierarchy described above in another thread and call
> > gtk_widget_show_all on the GtkFrame that is added, I get an error in paint
> > saying code should not be reached. Before this error, there is a warning
> > that the iterator in text view has changed. I am not sure if the warning
> > and error are related.
> >
> > Source of the error
> >
> > I replaced gtk_widget_show_all by gtk_widget_show in a loop going down
> > the tree and calling it for each object. The source of the error was the
> > gtk_widget_show on the leaf level view objects in the frames contained in
> > each cell of the table.
> >
> > Situations under which it works
> >
> > When the leaf level GtkTextView objects are not part of the hierarchy of
> > widgets I create or they are replaced by GtkEntry objects, everything works
> > fine. Again, note that it also works fine if I do not have another thread
> > and call everything from the main program on startup but I need to have
> > another thread as this object will be created during the course of the
> > program. I've tried both g_idle_add as well as using the
> > gdk_threads_enter/leave pair.
> >
> > Any help will be appreciated.
> >
> > -Ferdinand
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