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From: hreba <hreba@terra.com.br>
Newsgroups: comp.lang.ada
Subject: Re: GTK and tasking (GNAT)
Date: Sun, 04 May 2014 15:36:55 -0300
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Xref: news.eternal-september.org comp.lang.ada:19663
Date: 2014-05-04T15:36:55-03:00
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On 05/04/2014 04:31 AM, Dmitry A. Kazakov wrote:
> On Sat, 03 May 2014 17:30:08 -0300, hreba wrote:
>
>> Can somebody tell me what is wrong and how to do it right?
>
> 1. Gtk is not task-safe, which also includes Glib, Cairo etc.
>
> 2. Gtk are synchronous calls, when performed between tasks this may lead to
> deadlocking even in a task-safe environment, which Gtk is not.
>
> If you want to call to Gtk operations from an independent Ada task you must
> marshal it to the main task (the task running Gtk messages loop). An
> implementation of this mechanism is here:
>
> http://www.dmitry-kazakov.de/ada/gtkada_contributions.htm#1
>

Is 'task-safe' more or less the same as 'thread-safe'?

I have a little experience with GTK programming using Oberon, which 
doesn't contain a task concept on the language level.

I am somewhat disappointed about the details you have to understand 
about GTK and tasking in order to use a GUI in an Ada program.

Given that what I want is

  - libraries available on Linux and Windows (as GTK)
  - a GUI builder for the layout (as Glade)
  - no fancy things, but:
     * buttons
     * text boxes
     * drawing areas
     * keyboard, mouse click and mouse movement events
  - basic tasking: life output (progress) during lengthy calculations

What GUI library would you recommend?

I would be happy and grateful to use your GtkAda contributions, I just 
want to be sure to use more or less common software.

Thanks for your answer.
-- 
Frank Hrebabetzky		+55 / 48 / 3235 1106
Florianopolis, Brazil