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Bug 692044 - treeselection does not release references if treeview is destroy()ed
treeselection does not release references if treeview is destroy()ed
Product: pygobject
Classification: Bindings
Component: general
Other Linux
: Normal normal
: ---
Assigned To: Nobody's working on this now (help wanted and appreciated)
Python bindings maintainers
Depends on:
Blocks: 693111
Reported: 2013-01-18 23:18 UTC by Cole Robinson
Modified: 2018-01-10 20:22 UTC
See Also:
GNOME target: ---
GNOME version: ---

Script showing the issue (1.75 KB, text/x-python)
2013-01-18 23:18 UTC, Cole Robinson

Description Cole Robinson 2013-01-18 23:18:59 UTC
Created attachment 233810 [details]
Script showing the issue


  treeview.get_selection().connect("changed", mycb)

Leaves a reference hanging around on mycb. This doesn't happen if destroying a gtkcontainer with a child widget that has a callback. The attached script demos it a bit better. It might be specific to using gtkbuilder.

I didn't have this problem with pygtk2.
Comment 1 Simon Feltman 2013-01-19 10:50:36 UTC
It looks like this problem was already fixed in bug 685598. Please reopen if this is not the case. Thanks.

>>> import sys
>>> from gi.repository import Gtk
>>> def fn(*args):
...  print('hey')
>>> sys.getrefcount(fn)
>>> tv = Gtk.TreeView()
>>> tv.get_selection().connect('changed', fn)
>>> sys.getrefcount(fn)
>>> tv.destroy()
>>> sys.getrefcount(fn)

*** This bug has been marked as a duplicate of bug 685598 ***
Comment 2 Cole Robinson 2013-01-19 19:16:11 UTC
Hi Simon, thanks for the quick response.

However I installed pygobject-3.7.4 from Fedora, and the issue still reproduces with my script. The __del__ handler is not invoked for the second set of output.
Comment 3 Simon Feltman 2013-04-19 10:54:30 UTC
It seems like the builder object is holding a reference to the selection object and there is a circular reference with the Python handler/mygobj and the builder. Explicitly setting builder to None makes this go away. What is unclear to me at this point is actually how the first example is working :)

g2.builder = None
Comment 4 GNOME Infrastructure Team 2018-01-10 20:22:02 UTC
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