[Question] Is there a plan to support wasm-threads, specifically shared memory?

[bokuweb]

ref: bytecodealliance/wasm-tools#1306

Currently, when building with wasm32-wasi-preview1-threads using rayon, the generated wasm requires spawn_thread and shared memory. I believe shared memory is not yet considered. Are there any plans, discussions, or workarounds to address this?

[lukewagner]

The current plan is to extend threading support in core wasm through the shared-everything-threads proposal. The meat of this proposal is adding shared attributes to everything (not just memory), allowing whole instances to be shared (avoiding the O(n^2) function table usage with previous approaches) as well as a new solution for thread-local storage. There's also possibly a thread.spawn instruction for actually creating a new thread, but it's contentious (since it's a lot more work for browsers) so it's possible instead that we'll need to add thread.spawn as a canonical built-in to the Component Model (which would be importable by core wasm with the shared func type added by the shared-everything-threads proposal).

[bokuweb]

@lukewagner Thanks!!!!