Intent to Ship: Atomics.pause

Chromestatus

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Nov 15, 2024, 2:49:54 PM11/15/24

to blin...@chromium.org, s...@chromium.org

Contact emails

s...@chromium.org

Explainer

None

Specification

https://tc39.es/proposal-atomics-microwait

Summary

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

Blink component

Blink>JavaScript>Language

TAG review

None

TAG review status

Not applicable

Risks

Interoperability and Compatibility

None. This is a new static method on the Atomics namespace object.

Gecko: Positive This is a Stage 3 TC39 proposal.

WebKit: Positive This is a Stage 3 TC39 proposal.

Web developers: No signals

Other signals:

WebView application risks

Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications?

None

Debuggability

None

Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, ChromeOS, Android, and Android WebView)?

Yes

Is this feature fully tested by web-platform-tests?

Yes

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

Flag name on about://flags

--js-atomics-pause

Finch feature name

V8Flag_js_atomics_pause

Requires code in //chrome?

False

Estimated milestones

Shipping on desktop	133
DevTrial on desktop	128
Shipping on Android	133
DevTrial on Android	128
Shipping on WebView	133

Anticipated spec changes

Open questions about a feature may be a source of future web compat or interop issues. Please list open issues (e.g. links to known github issues in the project for the feature specification) whose resolution may introduce web compat/interop risk (e.g., changing to naming or structure of the API in a non-backward-compatible way).

None

Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/5106098833719296?gate=5145399126654976

This intent message was generated by Chrome Platform Status.

Rick Byers

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Nov 15, 2024, 2:59:56 PM11/15/24

to Chromestatus, blin...@chromium.org, s...@chromium.org

LGTM1 as TC39 stage 3

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Mike Taylor

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Nov 16, 2024, 9:21:22 AM11/16/24

to Rick Byers, Chromestatus, blin...@chromium.org, s...@chromium.org

LGTM2

To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAFUtAY-xg3t1zTLf-Jcqjn0yxGKPoBjyBgMg47gstAHnhwYWwg%40mail.gmail.com.

Domenic Denicola

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Nov 18, 2024, 3:05:18 AM11/18/24

to blink-dev, Mike Taylor, blin...@chromium.org, Shu-yu Guo, Rick Byers, Chromestatus

LGTM3.

You might want to update ChromeStatus's explainer field to point to https://github.com/tc39/proposal-atomics-microwait/blob/main/README.md which is a pretty nice explainer.

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