asyncio: support 'async with' for locks

[1st1]

BPO	24178
Nosy	@gvanrossum, @vstinner, @asvetlov, @1st1
Files	alock.patch alock_2.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 = 'https://github.com/1st1'
closed_at = <Date 2015-05-13.18:40:08.361>
created_at = <Date 2015-05-13.16:30:54.573>
labels = ['type-feature', 'expert-asyncio']
title = "asyncio: support 'async with' for locks"
updated_at = <Date 2015-05-13.18:40:08.360>
user = 'https://github.com/1st1'

bugs.python.org fields:

activity = <Date 2015-05-13.18:40:08.360>
actor = 'yselivanov'
assignee = 'yselivanov'
closed = True
closed_date = <Date 2015-05-13.18:40:08.361>
closer = 'yselivanov'
components = ['asyncio']
creation = <Date 2015-05-13.16:30:54.573>
creator = 'yselivanov'
dependencies = []
files = ['39361', '39363']
hgrepos = []
issue_num = 24178
keywords = ['patch']
message_count = 4.0
messages = ['243102', '243107', '243110', '243115']
nosy_count = 5.0
nosy_names = ['gvanrossum', 'vstinner', 'asvetlov', 'python-dev', 'yselivanov']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue24178'
versions = ['Python 3.5']

[1st1]

The attached patch makes Locks, Conditions, Semaphores, and BoundedSemaphores support new 'async with' syntax.

Because the patch contains a file that will only be checked in to the CPython repo (test_pep492.py), I decided to create the issue on bugs.python.org instead of asyncio GH repo.

Please review.

[1st1]

Updated patch is attached:

• '__aenter__' returns None
• "with await lock" is now supported.

[python-dev]

New changeset 616f15f05530 by Yury Selivanov in branch 'default':
bpo-24178: support 'async with' for asyncio locks.
https://hg.python.org/cpython/rev/616f15f05530

[1st1]

Guido, thanks for review. Closing the issue.