Re: gir and refcounting

[Gergely Polonkai <gergely polonkai eu>]

My first thought is that Perl and Glib::Object::Introspection is just fine.
If I were you, I would further debug my own application, with something
like refdbg (http://refdbg.sourceforge.net/ despite the looks, it still
works nowadays) or GObject-list (https://github.com/danni/gobject-list
haven’t tried it myself, but it got pretty good feedback).

Best,
Gergely

On 2 January 2015 at 12:24, Wouter Verhelst <w uter be> wrote:

> Hi,
>
> After help on this list, I got my API documentation to work properly,
> and have since added GObject-Introspection annotations so that I could
> use it from perl.
>
> When running the following script:
>
> ---
> use Glib::Object::Introspection;
>
> Glib::Object::Introspection->setup(
>         basename => "Joy",
>         version => "1.0",
>         package => "Joy");
>
> my $stick = Joy::Stick->open("/dev/input/js0");
> if(!$stick->get("open")) {
>         print("Joystick could not be opened.\n");
>         exit 0;
> }
> print "Joystick " . $stick->describe() . " has " .
> $stick->get_button_count() . " buttons and " . $stick->get_axis_count() . "
> axes\n";
> ---
>
> then the output is:
>
> Joystick Logitech Inc. WingMan Gamepad Extreme has 10 buttons and 4 axes
> GLib-GObject-CRITICAL **: g_object_get_qdata: assertion 'G_IS_OBJECT
> (object)' failed during global destruction.
> GLib-GObject-CRITICAL **: g_object_steal_qdata: assertion 'G_IS_OBJECT
> (object)' failed during global destruction.
> GLib-GObject-CRITICAL **: g_object_unref: assertion 'G_IS_OBJECT (object)'
> failed during global destruction.
>
> (or, when no joystick is present:)
>
> Joystick could not be opened.
> GLib-GObject-CRITICAL **: g_object_get_qdata: assertion 'G_IS_OBJECT
> (object)' failed during global destruction.
> GLib-GObject-CRITICAL **: g_object_steal_qdata: assertion 'G_IS_OBJECT
> (object)' failed during global destruction.
> GLib-GObject-CRITICAL **: g_object_unref: assertion 'G_IS_OBJECT (object)'
> failed during global destruction.
>
> This occurs because somehow, perl seems to have a higher reference count
> than does glib, causing it to deref the object when it's already been
> destroyed. I've been trying to figure out what the problem is, but so
> far without luck.
>
> Anyone know what's happening?
>
> Code is at https://github.com/yoe/libjoy
>
> Thanks,
>
> --
> It is easy to love a country that is famous for chocolate and beer
>
>   -- Barack Obama, speaking in Brussels, Belgium, 2014-03-26
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