[subinterpreters] Implement _xxsubinterpreters.channel_send_wait()

[benedwards14]

BPO	40390
Nosy	@ericsnowcurrently, @benedwards14
PRs	bpo-40390: Implement channel_send_wait for subinterpreters #19715

^{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 = None
created_at = <Date 2020-04-25.19:19:24.075>
labels = ['expert-subinterpreters', 'type-feature', '3.9']
title = '[subinterpreters] Implement _xxsubinterpreters.channel_send_wait()'
updated_at = <Date 2020-05-15.00:39:23.419>
user = 'https://github.com/benedwards14'

bugs.python.org fields:

activity = <Date 2020-05-15.00:39:23.419>
actor = 'vstinner'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Subinterpreters']
creation = <Date 2020-04-25.19:19:24.075>
creator = 'benedwards14'
dependencies = []
files = []
hgrepos = []
issue_num = 40390
keywords = ['patch']
message_count = 3.0
messages = ['367280', '367560', '367859']
nosy_count = 2.0
nosy_names = ['eric.snow', 'benedwards14']
pr_nums = ['19715']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue40390'
versions = ['Python 3.9']

Linked PRs

• bpo-32604: [_xxsubinterpreters] Add channel_send_wait(). #19829
• gh-84570: Implement Waiting in SendChannel.send() #110565
• gh-84570: Add Timeouts to SendChannel.send() and RecvChannel.recv() #110567
• gh-84570: Add Threading Timeout Helpers to Internal C-API #110948
• gh-84570: Factor Out _channel_send_wait() #110949
• gh-84570: Send-Wait Fixes for _xxinterpchannels #111006

[benedwards14]

When sending a message to another interpreter allow the caller to wait until the message has been received.

[ericsnowcurrently]

Thanks, Ben. I'll take a look.

[ericsnowcurrently]

Thanks for working on this, Ben! FWIW, I've put up a separate PR to demonstrate how I was thinking we would solve this: #19829.