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

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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/

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).

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...

Oh right, that makes sense in the context of this thread :)

> 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 :)

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