Damn, it's my problem -- sorry for the noise. It seems that
IronPython.NewTypes.BlahBlah.ExtensibleBlah types don't handle equality
quite how I expected... clearly, I need to learn to fire up windbg
*before* I post. At least we rediscovered the __del__ bug ;-).
Incidentally, congratulations on 2.0.2!
Dino Viehland wrote:
The first 2 things that occur to me is that either there's an exception
happening when we run WeakRefTracker's finalizer (it swallows exceptions)
or the object simply isn't being collected.
But it definitely sounds like we're creating the object which will
ultimately call __del__ when it gets finalized.
Have you tried windbg + SOS and done a !DumpHeap to see if the object
could still be alive? Another thought would be to look at the finalizer
queue and make sure it's not blocked on something (like a transition
into an STA).
-----Original Message-----
From: users-boun...@lists.ironpython.com [mailto:users-
boun...@lists.ironpython.com] On Behalf Of William Reade
Sent: Tuesday, July 21, 2009 9:20 AM
To: Discussion of IronPython
Subject: Re: [IronPython] object lifecycle issues
Dino Viehland wrote:
#2 I'd guess could be either that for some reason we're failing to
detect the presence of __del__ or that when we run the finalizer
cleanup
that we believe it's part of cyclic trash and don't think we should
cleanup.
Of those I'd think it'd be the cyclic trash detection that'd be most
likely to go wrong.
I'd suggest putting a break point or some logging in
PythonOps.InitializeForFinalization and in WeakRefTracker's finalizer
and see what's happening there.
In PythonOps.InitializeForFinalization, I see 2 InstanceFinalizers
created for each object; one after the stub __new__, and one after the
real __new__. Each IF creates a WeakRefTracker as expected; in both
cases, the second WRT (and only the second one) is subsequently
GC.SuppressFinalized in SetFinalizerWorker. However, in the broken
cases, the WRT finalizer just never gets called.
I'll keep hunting, but it seemed worth posting this in case it rang any
bells.
Cheers
william
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