Re: Problem with global destruction

[Ari Jolma <ari jolma tkk fi>]

muppet kirjoitti:
> Ari Jolma wrote:
>   
> > I tried commenting out every line of code which has something to do with
> > signals and it turns out that if I connect the size_allocate signal to a
> > function (this is in sub INIT_INSTANCE of the subclass of
> > Gtk2::ScrolledWindow):
> >
> > $self->{image}->signal_connect(size_allocate => \&size_allocate, $self);
> >
> > the problem appears.
> >     
>
> At first blush, it sounds like you have created a reference leak.  (This is
> far from definitive, but that's what it sounds like.)
>
> Try overriding the destroy signal (NOT the DESTROY method, but the "destroy"
> signal!!) on your ScrolledWindow subclass, and in there, disconnect the signal
> and destroy the child.
>   

Couldn't do that, the signal seems to connect (it returns an integer) 
but does not get called (I tried signals "destroy" and "destroy_event"). 
However, I can call the do_destroy (below) from the close subroutine of 
the main window. But that does seem to help :(

Ari

>  # INIT_INSTANCE
>    # keep the handler id so we can disconnect it later
>    $self->{image_allocate_signal} =
>         $self->{image}->signal_connect(size_allocate => \&size_allocate, $self);
>
>  # do_destroy
>    # disconnect the handler added in INIT_INSTANCE to break the ref cycle
>    $self->{image}->signal_handler_disconnect ($self->{image_allocate_signal});
>    # chain up, so that the rest of the destruction happens properly
>    $self->signal_chain_from_overridden (@_);
>    # release our own reference (may not be strictly necessary)
>    delete $self->{image};
>
>
>
>   


--
Prof. Ari Jolma
Geoinformaatio- ja paikannustekniikka
Geoinformation and positioning technology
Teknillinen Korkeakoulu / Helsinki University of Technology
POBox 1200, 02015 TKK, Finland
Email: ari.jolma at tkk.fi URL: http://www.tkk.fi/~jolma