Is my application single- or multi-threaded?

[Simon Sandström]

Hello,

I have an application that first creates and setups a WebSocket, like
this:

ws = emscripten::val::global("WebSocket").new_(emscripten::val(...));
ws.set("onopen", emscripten::val::module_property("onopen"));
ws.set("onmessage", emscripten::val::module_property("onmessage"));

and then it sets a main loop with emscripten_set_main_loop(...).
Everything works fine right now as there are no shared resouces between
onopen/onmessage and the code that is run in the main loop, but in the
future it will be.

Is my application multi-threaded? Can the onopen/onmessage event fire
and execute at the same time as my main loop? Answers online are mostly
old and says that there are no multi-threading in browser JavaScript,
but what about web workers? Are they involved in this scenario?


- Simon

[Derek Schuff]

Unless you are using the -s USE_PTHREADS flag, then your application is not mult-threaded. So the browser main thread event loop is driving everything, and there shouldn't be events firing simultaneously. There's only a web worker if you create the worker yourself and instantiate the emscripten module on that worker (and if you do that, there's a completely separate JS/wasm environment that's not shared with the main-thread environment).

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