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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: GTK and tasking (GNAT)
Date: Sun, 4 May 2014 21:26:21 +0200
Organization: cbb software GmbH
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Date: 2014-05-04T21:26:21+02:00
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On Sun, 04 May 2014 15:36:55 -0300, hreba wrote:

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

Yes.
 
> 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.

Tasking is not simple. Tasking in a GUI is always complicated.

> 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

Progress indicator is not tasking.

Tasking is when the job is done in a task independent on the main task
processing the messages loop.

> What GUI library would you recommend?

Gtk is no worse than anything else. [*]

P.S. Raw Windows API is largely task-safe. But Windows API is not portable
and it has other issues, like messages generators and deadlocks.

------
* Except that Gtk 3.x is very poorly supported. Gtk 2.24 is quite usable. I
hope that coming GNAT GPL 2014 will improve this.

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