RFC notifications bot (Apr 23 2026 at 22:12): 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-threadsandwasi-commoncrates, along with the-SthreadsCLI 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
RFC notifications bot (Apr 24 2026 at 12:20):fitzgen submitted PR review:
Thanks for writing this up!
RFC notifications bot (Apr 24 2026 at 12:24):bjorn3 submitted PR review.
RFC notifications bot (Apr 24 2026 at 12:24):bjorn3 created PR review comment:
*
-Sthreads
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!
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.
RFC notifications bot (Apr 24 2026 at 21:09):programmerjake submitted PR review.
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).
RFC notifications bot (Apr 24 2026 at 21:13):cfallin submitted PR review:
Thanks for writing this up!
RFC notifications bot (Apr 24 2026 at 21:48):pchickey submitted PR review.
RFC notifications bot (Apr 25 2026 at 10:12):bnjbvr submitted PR review.
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
RFC notifications bot (May 04 2026 at 12:02)::memo: teor2345 submitted PR review.
RFC notifications bot (May 04 2026 at 12:02)::speech_balloon: teor2345 created PR review comment:
will suffice for applications that "just need threads" to be ported to
RFC notifications bot (May 04 2026 at 16:09):alexcrichton updated PR #47.
RFC notifications bot (May 04 2026 at 16:10):alexcrichton commented on PR #47:
I'm moving this now into
Final Comment Period
and if no objections or other issues are raised, this RFC should merge on 2026-05-18.
RFC notifications bot (May 19 2026 at 04:42):alexcrichton commented on PR #47:
With no objections I'm going to merge.
RFC notifications bot (May 19 2026 at 04:42)::check: alexcrichton merged PR #47.
Last updated: Jun 01 2026 at 09:49 UTC