Add callbacks to be invoked when locale changes

[ncoghlan]

BPO	9727
Nosy	@malemburg, @loewis, @ncoghlan

^{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 2014-06-18.06:16:34.977>
created_at = <Date 2010-08-31.22:29:14.863>
labels = ['type-feature', 'library']
title = 'Add callbacks to be invoked when locale changes'
updated_at = <Date 2014-06-18.06:16:34.975>
user = 'https://github.com/ncoghlan'

bugs.python.org fields:

activity = <Date 2014-06-18.06:16:34.975>
actor = 'loewis'
assignee = 'none'
closed = True
closed_date = <Date 2014-06-18.06:16:34.977>
closer = 'loewis'
components = ['Library (Lib)']
creation = <Date 2010-08-31.22:29:14.863>
creator = 'ncoghlan'
dependencies = []
files = []
hgrepos = []
issue_num = 9727
keywords = []
message_count = 4.0
messages = ['115281', '220851', '220900', '220922']
nosy_count = 4.0
nosy_names = ['lemburg', 'loewis', 'ncoghlan', 'BreamoreBoy']
pr_nums = []
priority = 'normal'
resolution = 'wont fix'
stage = None
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue9727'
versions = ['Python 3.2']

[ncoghlan]

As part of the PEP-384 discussion, it was noted that one of the problems with mixed C runtimes on Windows is that each C runtime in the process has it's own idea of the current locale setting.

This can be addressed to some degree by having extension modules query and modify the Python interpreter's locale setting rather than the C runtime setting, but doesn't help those modules react to *changes* in the setting.

Would it be worth adding a callback registration mechanism to the locale module to allow modules to be notified when the locale changes? (It seems like this may be useful even outside the context of PEP-384, e.g. to dynamically update displays in GUI applications)

[BreamoreBoy]

@nick is this something you'd like to pick up on, and are there any other Windows gurus who should be added to the nosy list?

[ncoghlan]

It ended up there were more serious problems with mixing runtimes on
Windows (especially around file descriptors), so this likely wouldn't help
much in practice.

[loewis]

Closing as won't fix, then.