Stream: rfc-notifications

Topic: rfcs / PR #47 Remove wasi-threads and `wasi-common` from ...

view this post on Zulip RFC notifications bot (Apr 23 2026 at 22:12):

alexcrichton opened PR #47 from alexcrichton:rm-wasi-threads to bytecodealliance:main:

Delete the implementation of the [wasi-threads] proposal from Wasmtime, namely the wasmtime-wasi-threads and wasi-common crates, along with the -Sthreads CLI flag. Uses cases that need any threading at all for portability will be served in the near term with WASIp3 cooperative threads, and long-term support for true multithreading will be best served through the [shared-everything-threads] proposal.

[wasi-threads]: https://github.com/webassembly/wasi-threads
[shared-everything-threads]: https://github.com/webassembly/shared-everything-threads

view this post on Zulip RFC notifications bot (Apr 24 2026 at 12:20):

fitzgen submitted PR review:

Thanks for writing this up!

view this post on Zulip RFC notifications bot (Apr 24 2026 at 12:24):

bjorn3 submitted PR review.

view this post on Zulip RFC notifications bot (Apr 24 2026 at 12:24):

bjorn3 created PR review comment:

*-Sthreads

view this post on Zulip RFC notifications bot (Apr 24 2026 at 12:43):

tschneidereit submitted PR review:

This is a great writeup of the situation and what we discussed in the Wasmtime call—thank you!

view this post on Zulip RFC notifications bot (Apr 24 2026 at 14:59):

alexcrichton commented on PR #47:

This technically meets the criteria for FCP with two approvals, but given the nature of this change and amount of time this PR has been open I don't plan on starting FCP for another week or two to ensure folks have a chance to take a look at this.

view this post on Zulip RFC notifications bot (Apr 24 2026 at 21:09):

programmerjake submitted PR review.

view this post on Zulip RFC notifications bot (Apr 24 2026 at 21:09):

programmerjake created PR review comment:

  (e.g. they all specifically assume single-threaded semantics and execution).

view this post on Zulip RFC notifications bot (Apr 24 2026 at 21:13):

cfallin submitted PR review:

Thanks for writing this up!

view this post on Zulip RFC notifications bot (Apr 24 2026 at 21:48):

pchickey submitted PR review.

view this post on Zulip RFC notifications bot (Apr 25 2026 at 10:12):

bnjbvr submitted PR review.

view this post on Zulip RFC notifications bot (Apr 25 2026 at 10:12):

bnjbvr created PR review comment:

on the [shared-everything-threads] proposal. The instance-per-thread model on the web

Last updated: May 03 2026 at 22:13 UTC