Re: segv on exit from certain uimanager program

[Kevin Ryde <user42 zip com au>]

muppet <scott asofyet org> writes:
>
>     $toplevel->signal_connect (destroy => sub { delete $_[0]{ui} });
>
> That's a typical way to break a reference cycle, which may be the root  
> of the problem.

It seems strange a circular reference is/may-be actively harmful, as
opposed to just mucking about with the order of destructors, or not
doing them at all.

>     $toplevel->signal_connect (destroy => sub { Gtk2->main_quit });
>     sub do_quit { $toplevel->destroy }   # a confirmation prompt would  
> go here

Ah yes.  I guess there's a choice whether to destroy inside the main
loop or let it happen (if it does) outside.

> This has the added benefit of making your script finish properly when  
> the user kills the window via the window manager.

I'd hooked onto delete-event myself, not really trusting/knowing the
default for that is a destroy (I know it is for dialogs via a slight
hack, wan't sure about toplevels).  I think I still need delete-event if
I play 20 questions with the user about jobs in progress.  (Not that
that's related to the segv ...)


Emmanuele Bassi <ebassi gmail com> writes:
>
>   sub do_quit { Gtk2->main_quit }

Yep, that's what I've changed to.  I don't know why I started with exit
-- probably because I wanted to exit :).

> instead. calling "exit" is really not the nicest way to terminate a GTK+
> application, in *any* language.

There's so many ways a program can keel over unexpectedly I figure you
can't really count on much in the way of finish-ups (while not disputing
the general virtue I suppose in making an effort).