Re: [Gramps-devel] Potential memory leak solution

[Benny M. <ben...@gm...>]

Gary,

I wonder if there is no possibility to actually use the __del__ method?
http://docs.python.org/reference/datamodel.html#special-method-names.

So __del__ is called when ref count is zero, and del x decreases the ref
count. As the editors and tabs are destroyed and have ref count of one, on
destruction __del__ would be called, and there the del of the gtk objects
can be done.
If this works the difference would be that no cleanup_on_exit method must be
called in the using objects, as python takes care of calling __del__ on the
tabs when ref count goes to zero.
Don't know if it would work though, as GrampsTab inherits from VBox and is
part of the glade notebook. I wonder how you make sure the tab itself
obtains a del, in the editors I suppose? If so, then doing del on them,
would invoke __del__ but only if glade does not interfere with a ref count
of itself.

See also: http://www.lshift.net/blog/2008/11/14/tracing-python-memory-leaksabout
circular links causing memory leaks

Benny

2009/2/19 Gary Burton <bur...@ya...>

> >I will try this on one of the editor windows tomorrow night and see if it
> fixes the leaks.
>
> I have experimented further with the event editor window and it is showing
> some promise.
>
> For this particular window all the non-glade GTK objects are concentrated
> in the various tab page objects. In my own repository I have added a cleanup
> method to each tab object as well as their ancestor objects GrampsTab,
> ButtonTab and EmbeddedList where I can del any instance variables pointing
> to GTK objects. Instance variables containing lists of these objects also
> need removing from scope.
>
> Any window based on EditPrimary has a cleanup_on_exit method where each tab
> cleanup method can be called followed by a del on the instance variables
> referencing each tab.
>
> Doing all of this gives me an event editor window that closes down cleanly
> without leaving behind any of it's little friends. I don't have any more
> time to work on Gramps till the weekend, so I shall commit some changes to
> SVN then, but it's looking good so far.
>
> Bye
>
> Gary
>
>
>
>
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