[issue36818] Add PyInterpreterState.runtime.

[Eric Snow]

New submission from Eric Snow <ericsnowcurrently at gmail.com>:

Currently we use the _PyRuntime static global to access the runtime state in various places.  At the same time, in thread contexts we get access to the thread state from Thread-Local Storage and the interpreter state by indirection from there.  We should do the same for the runtime state instead of using the global directly.

My plan is to add a PyInterpreterState.runtime field.  It can then be used in the same way we use PyThreadState.interp to access the interpreter state.

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assignee: eric.snow
components: Interpreter Core
messages: 341595
nosy: eric.snow, vstinner
priority: normal
severity: normal
stage: patch review
status: open
title: Add PyInterpreterState.runtime.
versions: Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36818>
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