Stream: wasi

Topic: wasmtime threads

Scott Waye (May 04 2023 at 00:54):

Is there an option for wasmtime to enable threads? I tried --enable-threads but that is not recognized. I've built everything with -pthread and -target wasm32-wasi-threads

Scott Waye (May 04 2023 at 00:55):

E:\tmp\consolelocal>wasmtime run --allow-precompiled obj\Debug\net8.0\wasi-wasm\native\console.wasm
Error: failed to parse WebAssembly module

Caused by:
    Invalid input WebAssembly code at offset 23077: threads must be enabled for shared memories

This is my error

Alex Crichton (May 04 2023 at 01:11):

I believe the flag you're looking for is --wasm-features=threads

Scott Waye (May 04 2023 at 12:36):

Thanks yes, that looks like it but

Error: failed to run main module `obj\Debug\net8.0\wasi-wasm\native\console.wasm`

Caused by:
    0: failed to instantiate "obj\\Debug\\net8.0\\wasi-wasm\\native\\console.wasm"
    1: unknown import: `wasi::thread-spawn` has not been defined

Maybe that is not implemented yet in wasmtime

Alex Crichton (May 04 2023 at 14:25):

@Scott Waye you might be interested in this blog post which describes the wasi-threads support in Wasmtime a bit more. Namely the --wasi-modules=experimental-wasi-threads argument needs to be passed

Scott Waye (May 04 2023 at 14:29):

Thanks, that's great. I see I'm missing some linker flags also to import and export the memory. Will do some more playing. I realize it is all pretty new.

Andrew Brown (May 04 2023 at 15:53):

@Scott Waye, the Rust support for wasi-threads is still being worked on but C/C++ should be currently possible. Coincidentally, others have been asking similar questions so I opened up this public thread over in the wasi-threads channel to coordinate progress. Feel free to join in there if you want to contribute.

Afshan Ahmed Khan (May 23 2024 at 11:16):

1. Hi everyone ! I want to wait / sleep or run a function after timeout of some seconds in wasm32-wasi component ? But I want that to be cancellable .
   I tried doing this - https://stackoverflow.com/a/70121550 But I get attached error on spawning thread , I have tried compiling my rust to wasm32-wasip1-threads and on host I have make sure to enable wasm_threads support by config.wasm_threads(true)

image.png

Alex Crichton (May 23 2024 at 14:54):

I responded on the issue you opened, happy to either continue there or here too

Afshan Ahmed Khan (May 23 2024 at 15:14):

Thanks for responding , let's continue on the issue .

Last updated: Dec 23 2024 at 12:05 UTC