[issue35423] Signal handling machinery still relies on "pending calls".

[Eric Snow]

Eric Snow <ericsnowcurrently at gmail.com> added the comment:

Correct.  The remaining call to Py_AddPendingCall in the signal-handling code is fine.

This issue is only indirectly related.  I suppose you could consider it a follow-up to #30703.  The PR for that issue (GH-2415) switches from using pending calls for signal handlers to using the pending calls machinery without actual pending calls.

So here I want to address taking the next step: deal with pending signals separately from pending calls.  That separation helps simplify efforts to adapt the pending calls machinery for use in arbitrary threads (rather than the main thread).  See #33608.

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components: +Interpreter Core
nosy: +pitrou

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