[issue7264] test_threading_local sometimes hangs when run with -R

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

It turns out that the __del__ method in _threading_local.py tries to
call threading.enumerate() which itself takes the _active_limbo_lock.
The problem is that __del__ can be called at any point in time (because
of the GC), including at a point where the same thread has already taken
the lock. The obvious fix is to bypass enumerate().

(an alternate fix would be to use an RLock for _active_limbo_lock, but
it could have unforeseen consequences, such as performance ones)

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keywords: +patch
Added file: http://bugs.python.org/file15259/threading_local.patch

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