expose platform-specific `PRIO_DARWIN_*` constants for core type selection on macOS in `os` module.

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Feature or enhancement

As described in this stack overflow answer, the way to select "efficiency" vs. "performance" cores on Apple Silicon macOS machines is to use setpriority. However, you need to use custom platform-specific constants to do this, specifically, PRIO_DARWIN_BG, and either PRIO_DARWIN_THREAD or PRIO_DARWIN_PROCESS.

Pitch

It's just a few integer constants and it would expose a pretty important bit of power-efficiency/performance-tuning functionality for Python.

Previous discussion

No previous discussion anywhere, this seems like a fairly minor addition. This platform-specific functionality seems consistent with the way these functions are already treated, given that os.PRIO_* are already "Unix, not Emscripten, not WASI".

Linked PRs

• GH-103545: Add macOS specific constants for os.setpriority to os #104606

[ronaldoussoren]

Thanks for the report.

The constants will be in 3.12. The PR cannot be back ported to older releases because this changes the API of the os module.