Does spawn_blocking work in tokio_with_wasm?

[johnwaltonvi]

Hi,

I'm getting this error while calling spawn_blocking in basic rinf setup with these message:

hub.js:575 Error `SPAWN` in `tokio_with_wasm`:
JsValue("Calling `spawn` in a blocking thread is not allowed. While this is possible in real `tokio`, it may cause undefined behavior in the JavaScript environment. Instead, use `tokio::sync::mpsc::channel` to listen for messages from the main thread and spawn a task there.")

This is the test snippet. In a basic rinf demo.

    let test_handle = spawn_blocking(move || {
        info!("🔥 SIMPLE TEST - spawn_blocking IS WORKING");
    });
    let res = test_handle.await;
    match res {
        Ok(_) => info!("spawn_blocking completed successfully"),
        Err(e) => error!("spawn_blocking failed: {:?}", e),
    }

Does it work? Been trying to get it to work for hours.
https://github.com/cunarist/tokio-with-wasm
cunarist/tokio-with-wasm#32

fortunately rayon with wasm adapter is working 🗡️ :D

[temeddix]

Hi @johnwaltonvi

That error happens when you call spawn inside one of the blocking threads.

Are you calling spawn inside spawn_blocking somewhere in your code? If so, you might need to move the spawn into non-blocking async threads.

If you have any additional context, please let me know :)