[Patch] Make presence of SCHED_* optional

[EdSchouten]

BPO	27656
Nosy	@EdSchouten
Files	sched.diff: Patch for declaring SCHED_* conditionally

^{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 2016-07-31.06:22:40.100>
created_at = <Date 2016-07-30.15:49:07.658>
labels = ['extension-modules']
title = '[Patch] Make presence of SCHED_* optional'
updated_at = <Date 2016-07-31.06:22:40.097>
user = 'https://github.com/EdSchouten'

bugs.python.org fields:

activity = <Date 2016-07-31.06:22:40.097>
actor = 'python-dev'
assignee = 'none'
closed = True
closed_date = <Date 2016-07-31.06:22:40.100>
closer = 'python-dev'
components = ['Extension Modules']
creation = <Date 2016-07-30.15:49:07.658>
creator = 'EdSchouten'
dependencies = []
files = ['43952']
hgrepos = []
issue_num = 27656
keywords = ['patch']
message_count = 2.0
messages = ['271697', '271723']
nosy_count = 2.0
nosy_names = ['python-dev', 'EdSchouten']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue27656'
versions = ['Python 3.6']

[EdSchouten]

The SCHED_* constants that are part of POSIX's <sched.h> are all optional:

http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sched.h.html

Python already declares the SCHED_SPORADIC constant as part of the POSIX module optionally, depending on whether it is present in C, but doesn't do this for the other SCHED_* constants.

This is problematic for CloudABI (https://mail.python.org/pipermail/python-dev/2016-July/145708.html), which doesn't support any scheduler interaction at all.

Attached is a patch to only define these if present.

[python-dev]

New changeset 095b424127e7 by Benjamin Peterson in branch '3.5':
all SCHED_ constants are optional (closes bpo-27656)
https://hg.python.org/cpython/rev/095b424127e7

New changeset 64b763290da9 by Benjamin Peterson in branch 'default':
merge 3.5 (bpo-27656)
https://hg.python.org/cpython/rev/64b763290da9