Intent to Ship: Shared Array Buffers (SABs) on Android
Lutz Vahl
Contact emails
va...@chromium.com, bi...@chromium.org, bbu...@chromium.comExplainer
https://github.com/whatwg/html/issues/4732https://github.com/whatwg/html/pull/4734
Specification
https://tc39.github.io/ecma262/#sec-sharedarraybuffer-objectsDesign docs
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBufferhttps://docs.google.com/document/d/1tXfF0sdMQJPtwc2qEGF_V_z5xiCkP3ayS5ByRz6Rc-A/edit?ts=5f236efa
Summary
Adds the JavaScript type SharedArrayBuffer to Android gated behind COOP/COEP. SharedArrayBuffers can be sent to Workers and without neutering the sent buffer. The underlying buffer will be shared between the workers. This feature is only targeting Android - https://www.chromestatus.com/feature/4570991992766464 handles all others platforms
Blink component
Blink>JavaScriptSearch tags
SABs, Wasm ThreadsRisks
Interoperability and Compatibility
We're re-enabling a feature on android which is already available on all Site Isolated platforms. This can be done safely by gating SABs behind COOP/COEP. The usage of SABs on all other platforms will be migrated as well. The broader plan is outlined in: https://groups.google.com/a/chromium.org/g/blink-dev/c/_0MEXs6TJhg
Gecko: Shipped/Shipping (https://hacks.mozilla.org/2020/07/firefox-79/) Shipped in 79
WebKit: No signal
Web developers: Positive
Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?
NoAs part of our response to side-channel attacks like Spectre, Chromium disabled SharedArrayBuffer globally, and then re-enabled it on platforms where we could comfortably deploy Site Isolation. This feature will re-enable SABs on Android.
Is this feature fully tested by web-platform-tests?
YesTracking bug
https://bugs.chromium.org/p/chromium/issues/detail?id=923807Launch bug
https://bugs.chromium.org/p/chromium/issues/detail?id=1071424Link to entry on the Chrome Platform Status
https://www.chromestatus.com/feature/5171863141482496Links to previous Intent discussions
Intent to prototype: https://groups.google.com/a/chromium.org/g/blink-dev/c/xtyi6D52DkMLutz Vahl
Technical Program Manager
Google Germany GmbH
Erika-Mann-Strasse 36
80636 München
Geschäftsführer: Paul Manicle, Halimah DeLaine Prado
Registergericht und -nummer: Hamburg, HRB 86891
Sitz der Gesellschaft: Hamburg
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Yoav Weiss
Contact emails
va...@chromium.com, bi...@chromium.org, bbu...@chromium.comExplainer
https://github.com/whatwg/html/issues/4732
https://github.com/whatwg/html/pull/4734Specification
https://tc39.github.io/ecma262/#sec-sharedarraybuffer-objectsDesign docs
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer
https://docs.google.com/document/d/1tXfF0sdMQJPtwc2qEGF_V_z5xiCkP3ayS5ByRz6Rc-A/edit?ts=5f236efaSummary
Adds the JavaScript type SharedArrayBuffer to Android gated behind COOP/COEP. SharedArrayBuffers can be sent to Workers and without neutering the sent buffer. The underlying buffer will be shared between the workers. This feature is only targeting Android - https://www.chromestatus.com/feature/4570991992766464 handles all others platforms
Blink component
Blink>JavaScriptSearch tags
SABs, Wasm ThreadsRisks
Interoperability and Compatibility
We're re-enabling a feature on android which is already available on all Site Isolated platforms. This can be done safely by gating SABs behind COOP/COEP. The usage of SABs on all other platforms will be migrated as well. The broader plan is outlined in: https://groups.google.com/a/chromium.org/g/blink-dev/c/_0MEXs6TJhg
Gecko: Shipped/Shipping (https://hacks.mozilla.org/2020/07/firefox-79/) Shipped in 79
WebKit: No signal
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Rick Byers
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Chris Harrelson
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