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spin v0.1.3 — low-latency spin primitives for Go

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@hayabusa-cloud hayabusa-cloud released this 28 Dec 09:14
· 11 commits to main since this release
v0.1.3
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Overview

spin provides small, low-latency spin primitives for performance-critical Go code paths.

Highlights

  • Lock: a minimal, non-fair spinlock designed for extremely short critical sections.
  • Wait: an adaptive spin-wait helper that escalates from CPU pause hints to cooperative scheduler yields.
  • Pause: an architecture-specific CPU hint intended for tight busy-wait loops; it must not block or yield the scheduler.

Platform support

Optimized implementations are provided on common architectures, with broad multi-arch support:
amd64, arm64, 386, arm, riscv64, ppc64le, s390x, loong64.

Notes

  • Lock is intentionally non-fair and is not a general-purpose replacement for sync.Mutex.
  • For polling loops, prefer Wait or Pause over ad-hoc runtime.Gosched() loops.

Installation

go get code.hybscloud.com/spin

Changelog

Bug Fixes

  • loong64: Fix pauseN using zero register (R0 → R4)
  • riscv64: Use PAUSE hint (Zihintpause) instead of FENCE
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