Re: glib ref counting problem

[Stefan Kost <kost imn htwk-leipzig de>]

Hi Tristan,

Tristan Van Berkom wrote:
> Stefan Kost wrote:
> [...]
>
> > I will try to make it clearer.
> > application creates the BtSong
> >   BtSong->refct=1
> > the songs instance init creates the private BtPattern and BtSetup
> > instances
> > and passes itself to their constructiors.
> >   BtSong->refct=3
> >   BtPattern->refct=1
> >   BtSetup->refct=1
>
>
> Why should (G_OBJECT(BtSong)->ref_count > 1) ?
>
> BtPattern & BtSetup do *not* need a reference on BtSong if
> BtPattern & BtSetup *belong* to BtSong.
unfortunately there are no explicit docs for the behaviour, but in set_property
method receiving a pointer needs to be secured. I will now try to switch to
add_weak_pointer(). One thing I dont get about this function is why I have to
pass the object and then the pointer to my weak pointer. In practice it will
look like:
myobject=object;
g_object_add_weak_pointer(myobject,&myobject);
Btw.: the docs should say, that the method does not initialize the passed
pointer to point to object.

same for
 g_object_remove_weak_pointer();

... I am drifting away ;-)
Anyway, I hope that this is the recommended way of doing these things, as I will
update the GObject tutorial soon.

> - App creates (and "owns") BtSong
>   - BtSong creates (and "owns") BtPattern
>   - BtSong creates (and "owns") BtSetup
>
> - App unref's BtSong
>   - BtSong unref's BtPattern
>   - BtSong unref's BtSetup
>
> Cheers,
>                            -Tristan

-- 
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