4 ms·

Even on the beta of the next Safari?

by jbk 5y ago

orbz 5y ago
According to https://caniuse.com/sharedarraybuffer https://caniuse.com/sharedarraybuffer it's default disabled on Safari due to spectre/meltdown, but can be enabled.
- paulgb 5y ago
  In addition to SharedArrayBuffer, it looks like the atomics themselves are in-progress on Safari[1]. They don't work for me on Safari Technology Preview, FWIW. As far as I can tell, “threads” from a WebAssembly implementation's perspective is just the combination of SharedArrayBuffer and atomics; support for the actual threading comes from Web Workers which are already a separate standard. Compilers like Emscripten then use the combination of the three to implement threading. [1] https://webassembly.org/roadmap/ https://webassembly.org/roadmap/
  - jlongster 5y ago
    What doesn't work about them? I use `Atomics.wait` and `Atomics.compareExchange` and maybe a couple other APIs and it works well on Safari Technology Preview (if you enable SharedArrayBuffer).
    - paulgb 5y ago
      Ah, I should have clarified that I mean the assembly instructions for atomics, rather than the JavaScript API. I.e. the opcodes listed here: https://github.com/WebAssembly/threads/blob/master/proposals/threads/Overview.md#atomic-memory-accesses https://github.com/WebAssembly/threads/blob/master/proposals...
      - jlongster 5y ago
        Oh right, that makes sense in the context of this thread :)
  - RReverser 5y ago
    > As far as I can tell, “threads” from a WebAssembly implementation's perspective is just the combination of SharedArrayBuffer and atomics; FWIW that's exactly what the linked post describes :)
nightpool 5y ago
SharedArrayBuffer was disabled in Safari 11 due to Spectre and Meltdown vulnerabilities. https://bugs.webkit.org/show_bug.cgi?id=212069 https://bugs.webkit.org/show_bug.cgi?id=212069 re-enabled it behind a flag, and talks about making it public "Once cross-origin isolation is done". However, it links to https://bugs.webkit.org/show_bug.cgi?id=215407 https://bugs.webkit.org/show_bug.cgi?id=215407 as representing when cross-origin isolation is complete, which as I understand it hasn't seen any activity in the past year.
turnsout 5y ago
As far as I can tell, it's not enabled in the beta, but looks like it's available on the Safari Technical Preview on the Mac behind a flag: https://developer.apple.com/safari/technology-preview/release-notes/ https://developer.apple.com/safari/technology-preview/releas...

Even on the beta of the next Safari?

by jbk 5y ago

Even on the beta of the next Safari?

orbz 5y ago

According to https://caniuse.com/sharedarraybuffer https://caniuse.com/sharedarraybuffer it's default disabled on Safari due to spectre/meltdown, but can be enabled.

paulgb 5y ago
In addition to SharedArrayBuffer, it looks like the atomics themselves are in-progress on Safari[1]. They don't work for me on Safari Technology Preview, FWIW. As far as I can tell, “threads” from a WebAssembly implementation's perspective is just the combination of SharedArrayBuffer and atomics; support for the actual threading comes from Web Workers which are already a separate standard. Compilers like Emscripten then use the combination of the three to implement threading. [1] https://webassembly.org/roadmap/ https://webassembly.org/roadmap/
- jlongster 5y ago
  What doesn't work about them? I use `Atomics.wait` and `Atomics.compareExchange` and maybe a couple other APIs and it works well on Safari Technology Preview (if you enable SharedArrayBuffer).
  - paulgb 5y ago
    Ah, I should have clarified that I mean the assembly instructions for atomics, rather than the JavaScript API. I.e. the opcodes listed here: https://github.com/WebAssembly/threads/blob/master/proposals/threads/Overview.md#atomic-memory-accesses https://github.com/WebAssembly/threads/blob/master/proposals...
    - jlongster 5y ago
      Oh right, that makes sense in the context of this thread :)
- RReverser 5y ago
  > As far as I can tell, “threads” from a WebAssembly implementation's perspective is just the combination of SharedArrayBuffer and atomics; FWIW that's exactly what the linked post describes :)

nightpool 5y ago

SharedArrayBuffer was disabled in Safari 11 due to Spectre and Meltdown vulnerabilities. https://bugs.webkit.org/show_bug.cgi?id=212069 https://bugs.webkit.org/show_bug.cgi?id=212069 re-enabled it behind a flag, and talks about making it public "Once cross-origin isolation is done". However, it links to https://bugs.webkit.org/show_bug.cgi?id=215407 https://bugs.webkit.org/show_bug.cgi?id=215407 as representing when cross-origin isolation is complete, which as I understand it hasn't seen any activity in the past year.

turnsout 5y ago

As far as I can tell, it's not enabled in the beta, but looks like it's available on the Safari Technical Preview on the Mac behind a flag: https://developer.apple.com/safari/technology-preview/release-notes/ https://developer.apple.com/safari/technology-preview/releas...