Is it possible to run WebAssembly code async?

Question

I have written a C function that I am able to execute from Angular/TypeScript/JavaScript using WebAssembly:

testWebAssembly() {
    Module.ccall(\"aCFunction         


        

Answer 1

WebAssembly and JavaScript share the same execution thread, i.e. when you execute WebAssembly from within JavaScript, your JavaScript code halts, and vice-versa. In that respect it's just like executing any other native (i.e, browser-supplied) APIs from your JavaScript code.

One option you do have is to run your WebAssembly in a WebWorker, using postMessage to send messages to your wasm code that executed in a different thread. There's a great example here, that renders a fractal using WebWorkers:

https://www.reddit.com/r/rust/comments/8hdq5r/a_rust_javascript_web_workers_fractal_renderer/

In the future WebAssembly will likely have its own support for threading:

https://github.com/WebAssembly/threads