WebAssembly/threads

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Threads and Atomics in WebAssembly

Stars: 767
Forks: 54
Open beginner issues: 0
Indexed issues: 74

Dominant language: WebAssembly
License: No license data
Last GitHub push: Jul 30, 2026
Latest indexed: Sep 20, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed
PR merge metrics: No merged PRs in 30d

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74 open issues indexed

Underspecification of disallowing waits on the main thread Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

WebAssembly/threads#254 · Opened Apr 8, 2026
Memory64, multithreading and the 128-bit atomics operations to combat the ABA problem Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

WebAssembly/threads#253 · 6 comments · Opened Apr 7, 2026
Merge upstream spec/main into threads Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/threads#245 · 1 reaction · Opened Feb 10, 2026
Merge conflicts preventing auto-update in testsuite repo Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/threads#240 · Opened Jan 14, 2026
Branch renaming Open

Difficulty 1/5 Under an hour Newbie friendliness 20/100

WebAssembly/threads#237 · Opened Oct 29, 2025
JS API: clarify refreshing of buffers Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

WebAssembly/threads#234 · 3 comments · Opened Oct 2, 2025
Can tables be shared? Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

WebAssembly/threads#233 · 4 comments · Opened Sep 14, 2025
Wait until deadline variant Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

WebAssembly/threads#231 · Opened May 15, 2025
Shouldn't this also be paired with a monotonic time opcode? Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

WebAssembly/threads#230 · 9 comments · Opened May 4, 2025
Inline data abbreviation for shared memories Open

Difficulty 1/5 Under an hour Newbie friendliness 45/100

WebAssembly/threads#226 · Opened Jul 1, 2024
Semantics of bulk memory operations Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/threads#225 · 5 comments · Opened May 6, 2024
Spec tests with memory offsets Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

WebAssembly/threads#223 · 1 comment · 1 reaction · Opened Feb 15, 2024
Merge in latest spec repo Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

WebAssembly/threads#222 · Opened Jan 17, 2024
Missing explanation of synchronisation events Open

WebAssembly/threads#220 · 1 assignee · Opened Nov 1, 2023
Interpreter can't translate `thread` construct to JS yet Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

WebAssembly/threads#218 · 3 comments · Opened Oct 19, 2023
Move the `upstream-rebuild` branch to `main` Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

WebAssembly/threads#216 · 2 reactions · Opened Oct 12, 2023
Missing docs on atomic nature of wait / notify Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/threads#211 · 1 comment · Opened Sep 11, 2023
Does the wasm memory model have tear-free non-atomic loads? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/threads#199 · 7 comments · Opened May 17, 2023
Path to Phase 4 Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

WebAssembly/threads#198 · 9 comments · 1 reaction · Opened May 16, 2023
Questions about non-atomic instructions like `i32.store` Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

WebAssembly/threads#197 · 8 comments · Opened Mar 22, 2023
Behavior of `t.atomic.rmw.cmpxchg` instructions Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/threads#195 · 7 comments · Opened Nov 17, 2022
Unsynchronized data races Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/threads#189 · 1 comment · Opened Jul 13, 2022
Move `shared` tests to separate files Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

WebAssembly/threads#187 · 1 comment · Opened Feb 14, 2022
LLVM/clang OpenMP - anyone? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/threads#186 · 4 comments · Opened Dec 14, 2021
Does this proposal support multi-memories? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/threads#180 · Opened Aug 25, 2021
Can we relax Atomics.wait to allow waiting on the main thread? Open

Difficulty 5/5 Over a week Newbie friendliness 32/100

WebAssembly/threads#177 · 27 comments · 18 reactions · Opened Apr 13, 2021
How to cancel a pending Atomics.waitAsync? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/threads#176 · 40 comments · Opened Jan 17, 2021
memory.atomic.wait32 on the main browser thread Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/threads#174 · 17 comments · Opened Jan 15, 2021
Introduce flag to prevent reallocation of shared memory Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/threads#173 · Opened Jan 6, 2021
[interpreter/spec] Use LEB for secondary opcodes Open

WebAssembly/threads#168 · 1 assignee · Opened Oct 26, 2020
[interpreter] Incorrect alignment check? Open

WebAssembly/threads#166 · 1 assignee · Opened Oct 26, 2020
Make shared tables a validation failure Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/threads#162 · 15 comments · Opened Jun 5, 2020
Please merge upstream Open

WebAssembly/threads#161 · 1 assignee · Opened May 13, 2020
Why is WebAssembly.Memory with shared set to false not serializable? Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

WebAssembly/threads#160 · 1 comment · 1 reaction · Opened Apr 21, 2020
return status of std::condition_variable wait_for is not always as expected Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

WebAssembly/threads#157 · 1 comment · Opened Apr 6, 2020
(ArrayBuffer or SharedArrayBuffer) is invalid IDL Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

WebAssembly/threads#155 · Opened Mar 27, 2020
https://webassembly.github.io/threads is out of date Open

Difficulty 1/5 Under an hour Newbie friendliness 55/100

WebAssembly/threads#152 · 1 comment · Opened Mar 19, 2020
Cannot find generated versions of the Web/JS API parts of the proposal Open

Difficulty 1/5 1-3 hours Newbie friendliness 45/100

WebAssembly/threads#151 · 1 comment · Opened Mar 18, 2020
Naming convention for wait/notify instructions Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

WebAssembly/threads#145 · 4 comments · Opened Oct 24, 2019
Not able to generate race condition Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

WebAssembly/threads#142 · 1 comment · Opened Aug 18, 2019
atomic.fence validation and binary encoding Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

WebAssembly/threads#140 · 10 comments · Opened Jun 16, 2019
What's the relationship between Wasm and WASI threading proposal? Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

WebAssembly/threads#138 · 19 comments · 1 reaction · Opened Jun 6, 2019
Lock objects (GC feature + WebIDL tie-ins) Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

WebAssembly/threads#136 · 2 comments · 1 reaction · Opened Apr 12, 2019
i64.atomic.wait has no matching futex syscall on Linux Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/threads#135 · 16 comments · Opened Feb 24, 2019
Plan for enabling Wasm threads Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/threads#124 · 2 comments · Opened Feb 5, 2019
Misalignment checks Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

WebAssembly/threads#123 · 9 comments · Opened Feb 5, 2019
is threads now available? Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

WebAssembly/threads#120 · 3 comments · Opened Jan 30, 2019
Revisiting the edge-case semantics of wake Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/threads#108 · 16 comments · Opened Oct 29, 2018
Should wake trap for out-of-bounds addresses? Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

WebAssembly/threads#105 · 14 comments · Opened Sep 14, 2018
Why is buffer frozen? Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

WebAssembly/threads#98 · 2 comments · Opened Aug 16, 2018

WebAssembly/threads

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