[issue37088] Add a way to schedule a function to be called from the main thread

[Yury Selivanov]

New submission from Yury Selivanov <yselivanov at gmail.com>:

When asyncio event loop is created in a non-main thread, it needs to initialize a so called ChildWatcher for it (a helper object to intercept subprocesses exits).  Doing that requires to run code in the main thread.

I propose to add a 'sys.addpendingcall' function that will simply expose the already existing Py_AddPendingCall to the pure Python land.

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components: Interpreter Core, asyncio
messages: 343897
nosy: asvetlov, vstinner, yselivanov
priority: normal
severity: normal
status: open
title: Add a way to schedule a function to be called from the main thread
versions: Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37088>
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