Remove own implementation for thread-local storage

[ma8ma]

BPO	30832
Nosy	@vstinner, @ma8ma
PRs	bpo-30832: Remove own implementation for thread-local storage #2537

^{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 2017-07-03.14:00:29.256>
created_at = <Date 2017-07-03.08:23:53.413>
labels = ['interpreter-core', 'type-feature', '3.7']
title = 'Remove own implementation for thread-local storage'
updated_at = <Date 2017-07-05.13:44:56.600>
user = 'https://github.com/ma8ma'

bugs.python.org fields:

activity = <Date 2017-07-05.13:44:56.600>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2017-07-03.14:00:29.256>
closer = 'vstinner'
components = ['Interpreter Core']
creation = <Date 2017-07-03.08:23:53.413>
creator = 'masamoto'
dependencies = []
files = []
hgrepos = []
issue_num = 30832
keywords = []
message_count = 5.0
messages = ['297543', '297547', '297572', '297588', '297749']
nosy_count = 2.0
nosy_names = ['vstinner', 'masamoto']
pr_nums = ['2537']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue30832'
versions = ['Python 3.7']

[ma8ma]

CPython has provided the own implementation for thread-local storage (TLS) on Python/thread.c, it's used in the case which a platform has not supplied native TLS. However, currently all supported platforms (NT and pthreads) have provided native TLS and defined the Py_HAVE_NATIVE_TLS macro with unconditional in any case.
Therefore, I'd propose removing outdated code.

python-dev: https://mail.python.org/pipermail/python-dev/2017-July/148534.html

[vstinner]

This change is related to the PEP-539: the new Thread-Local Storage (TLS) API.

[vstinner]

New changeset aa0aa04 by Victor Stinner (Masayuki Yamamoto) in branch 'master':
bpo-30832: Remove own implementation for thread-local storage (bpo-2537)
aa0aa04

[vstinner]

Well done, I didn't see any major outdage (compilation error) on 3.x buildbots ;-)

[vstinner]

New changeset 8207c17 by Victor Stinner in branch 'master':
Revert "bpo-30822: Fix testing of datetime module." (bpo-2588)
8207c17