golang/go

x/sys/unix: add darwin efficiency core scheduling integer constants

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#75,529 opened on Sep 18, 2025

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Description

Proposal Details

Darwin has the ability to force scheduling to the efficiency cores on Apple Silicon through the setpriority syscall, but the integer constants currently aren't exposed.

I think changing the regex here: cs.opensource.google / github from PRIO_(PROCESS|PGRP|USER) to PRIO_(PROCESS|PGRP|USER|DARWIN_THREAD|DARWIN_PROCESS|DARWIN_BG|DARWIN_NONUI) or PRIO_(PROCESS|PGRP|USER|DARWIN_(THREAD|PROCESS|BG|NONUI)) would result in being able to force execution onto an efficiency core.

As an additional reference, here's the CPython PR: https://github.com/python/cpython/issues/103545

I'd love to actually land this change in Go myself, but frankly don't know where to begin.

Contributor guide

Research direction
Fork the golang/sys repository, modify the regex in unix/mkerrors.sh to include PRIO DARWIN THREAD, PRIO DARWIN PROCESS, PRIO DARWIN BG, PRIO DARWIN NONUI, run the script to regenerate the errors unix.go files, and submit a pull request.
Tech stack
go
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Goshell scripting
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75