[lxml-dev] AssertionError double registering proxy

[Holger Joukl]

Hi,

lately I've been running into such problems:

2007/01/23 13:22:02:all2all_MainThread:ERROR:    cache[msg] =
list(msg.getiterator())
2007/01/23 13:22:02:all2all_MainThread:ERROR:   File "etree.pyx", line
1562, in etree.ElementDepthFirstIte
rator.__next__
2007/01/23 13:22:02:all2all_MainThread:ERROR:   File "etree.pyx", line
1207, in etree._elementFactory
2007/01/23 13:22:02:all2all_MainThread:ERROR:   File "proxy.pxi", line 28,
in etree.registerProxy
2007/01/23 13:22:02:all2all_MainThread:ERROR:<ThreadedQueue
name='TQ_normal'>: AssertionError: double regi
stering proxy!

I strongly suspect this is a threading-related problem as it occurs in a
multithreaded
test program.
I'm also able to fix this if any thread copy.deepcopy()'s all incoming
Elements
before doing anything with them (the threads basically dispatch from Queues
where other
threads have put Elements into).

Hence my question:
- Am I doing something nasty here which is pretty much forbidden (I know I
will have to copy
my Elements anyway, as my threads will want to modify them)
- and/or should lxml guard the element proxy registration
?

All the best,
Holger

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