Tentatively this feature is scheduled to ship with FF51. We're awaiting final security review. Shared memory and atomics are currently on by default on Nightly and (since bug 1309861) FF51 Developer Edition. The feature is available, but disabled by default, in Beta and Release.

We're still working through some final details on how and when to ship this, please hold.

Updated patch. (Still holding: Not reviewed, and additional requested functionality still not ready.)

Note, some Xrays support is about to land on trunk, see bug 1130988. This containts tests for specific channels. When landing this patch on central, those tests must additionally be adapted.

Patch appropriate for FF52 and later (current mozilla-central).

When landing this also remember to update js/src/shell/js.cpp, which has a RELEASE_OR_BETA guard on enabling SAB+Atomics by default in the shell.

We want to enable SAB+Atomics on beta for a while to ensure greater exposure to the web -- the feature has been enabled only on Nightly and Aurora so far. If the ship criteria are not met by February 20 I will back the patch out again. (This patch for m-c, uplift request and maybe aurora patch to follow.)

Ditto patch for aurora.

Comment on attachment 8828381 [details] [diff] [review] bug1312446-enable-sab-and-atomics.patch Review of attachment 8828381 [details] [diff] [review]: ----------------------------------------------------------------- Changes themselves look good to me. The commit message says "on beta", so just confirming, this is done by not backporting this patch to release?

(In reply to Shu-yu Guo [:shu] from comment #9) > Comment on attachment 8828381 [details] [diff] [review] > bug1312446-enable-sab-and-atomics.patch > > Review of attachment 8828381 [details] [diff] [review]: > ----------------------------------------------------------------- > > Changes themselves look good to me. The commit message says "on beta", so > just confirming, this is done by not backporting this patch to release? The commit message does not mention "beta" but the comment submitted with the patch above does. The thing is, there's no difference between release and beta in the code - features are enabled for both or neither. So what's happening here (cf my comment above) is that I'm enabling for beta by landing this patch on central and aurora now (aurora becomes beta next week) but not enabling for release by promising (again cf comment) to back it out before beta becomes release, if the release criteria are not met.

https://hg.mozilla.org/integration/mozilla-inbound/rev/4d870873f2b76157d57bcff8447140f7c0f7f877 Bug 1312446 - Enable SharedArrayBuffer and Atomics by default. r=shu

Comment on attachment 8828383 [details] [diff] [review] bug1312446-enable-sab-and-atomics-AURORA.patch Approval Request Comment [Feature/Bug causing the regression]: SharedArrayBuffer and Atomics [User impact if declined]: Feature will have to be manually enabled on beta, which is the current situation [Is this code covered by automated tests?]: Yes [Has the fix been verified in Nightly?]: Yes - enabled by default on Nightly (and indeed in Aurora) for months. Available behind flag on Beta and Release for ditto time. [Needs manual test from QE? If yes, steps to reproduce]: No [List of other uplifts needed for the feature/fix]: None [Is the change risky?]: Not really, and in any case, we want to test web compat, so some risk is required. [Why is the change risky/not risky?]: Extremely remote chance that the names of new global JS types clash with names that are used in programs on the web. [String changes made/needed]: None

Comment on attachment 8828383 [details] [diff] [review] bug1312446-enable-sab-and-atomics-AURORA.patch keep SharedArrayBuffer and Atomics enabled in beta, aurora52+

Backed out for sharedtypedarray.js failures. https://treeherder.mozilla.org/logviewer.html#?job_id=70852563&repo=mozilla-aurora https://hg.mozilla.org/releases/mozilla-aurora/rev/b9613014ba65c40a78227be03c69e993c70f96ad

Went a little better with bug 1332576 included. https://hg.mozilla.org/releases/mozilla-aurora/rev/3209927fdbf9

Added release notes announcement https://developer.mozilla.org/en-US/Firefox/Releases/52#JavaScript Updated SharedArrayBuffer and Atomics compat info (also on the sub pages) https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer#Browser_compatibility https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Atomics#Browser_compatibility