Reworked threading.local reference implementation

[pitrou]

BPO	9707
Nosy	@gpshead, @pitrou
Files	threadlocal.patch

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2010-09-07.22:06:45.659>
created_at = <Date 2010-08-28.20:26:35.603>
labels = ['type-bug', 'library']
title = 'Reworked threading.local reference implementation'
updated_at = <Date 2010-09-07.22:06:45.657>
user = 'https://github.com/pitrou'

bugs.python.org fields:

activity = <Date 2010-09-07.22:06:45.657>
actor = 'pitrou'
assignee = 'none'
closed = True
closed_date = <Date 2010-09-07.22:06:45.659>
closer = 'pitrou'
components = ['Library (Lib)']
creation = <Date 2010-08-28.20:26:35.603>
creator = 'pitrou'
dependencies = []
files = ['18669']
hgrepos = []
issue_num = 9707
keywords = ['patch']
message_count = 2.0
messages = ['115170', '115811']
nosy_count = 2.0
nosy_names = ['gregory.p.smith', 'pitrou']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue9707'
versions = ['Python 3.2']

[pitrou]

This is a reworked reference implementation of _threading_local without the __del__ quirks. The _patch() ugliness is unfortunately still needed because of a doctest checking that derived __slots__ attributes aren't actually thread-local.

Note that users are unlikely to ever use this code in the real world, except perhaps with non-CPython implementations.

[pitrou]

Committed in r84607.