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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Gtkada on Mac using Quartz
Date: Sun, 23 Aug 2015 15:32:41 +0200
Organization: cbb software GmbH
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Date: 2015-08-23T15:32:41+02:00
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On Sun, 23 Aug 2015 06:05:55 -0700 (PDT), ahlan@marriott.org wrote:

> The problem seems to be that I execute all my Gtk calls in a task rather
> than in the main program. If I call Gtk.Main.init then create and show a
> Gtk.window followed by Gtk.Main.Main in the body of the main program then
> this works.

GTK calls must be done on the context of the same task/thread running the
messages loop.

> Is there anything special about Ada tasks on a mac that might prevent Gtk
> from working?

Special is GTK, GDK, Gobject, GIO and the rest, which are not
multi-threaded. 

I don't think it must be the main task of the process, it could be any
task, but just one task.

I didn't try GTK running on a non-main task, because it would not make much
sense anyway. It is possible that Mac OS could have some limitations on
this, that depends on the Mac OS GDK backend. I doubt it is the case,
though.

> Has anyone been able to use Gtk from a task rather than from the program body?

See:

http://www.dmitry-kazakov.de/ada/gtkada_contributions.htm#1

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de