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Atomics.pause

Category

JavaScript

Type

Chromium catches up

Status

Enabled by default (Chrome 133)

Intent stage

None

• Breaking change: No
• Enterprise impact: None
• Chromium flag: --js-atomics-pause
• Spec maturity: Working draft
• Web Platform Tests: Yes

WPT details: Exists in test262: https://github.com/tc39/test262/tree/main/test/built-ins/Atomics/pause

Summary

Adds the Atomics.pause method to hint the CPU that the current code is executing a spinlock.

Motivation

Enables writing more efficient spinlocks.

Standards & signals

• Specification: https://tc39.es/proposal-atomics-microwait
• Firefox: Positive — This is a Stage 3 TC39 proposal.
• Safari: Positive — This is a Stage 3 TC39 proposal.
• Web developers: No signals

Ecosystem

• Web Platform Tests: https://wpt.fyi/results/?q=test%2Fbuilt-ins%2FAtomics%2Fpause
• Chrome Platform Showcase: https://chrome-platform-showcase.paulkinlan-ea.deno.net/features
• GenDN reference: https://gendn.paulkinlan-ea.deno.net/features
• chrome.dev demos search: https://www.google.com/search?q=site%3Achrome.dev+Atomics.pause
• MDN Web Docs: https://developer.mozilla.org/en-US/search?q=Atomics.pause
• Baseline status: https://webstatus.dev/?q=Atomics.pause

Docs: https://github.com/tc39/proposal-atomics-microwait/blob/main/README.md

View on chromestatus.com