How to get async callbacks on an exited pthread?

[mmarczell-graphisoft]

I have a pthread that has to call an async function via EM_JS. I cannot use Asyncify for a certain reason, so I thought my thread will simply finish executing after calling the async JS function, and in the then callback of the promise, I will ccall back into C++ and continue working.

But after a while the ccalled C++ code always crashes with runtime errors, out of bounds etc. I have found that I should be able to keep the runtime alive via one of three ways:

• call emscripten_exit_with_live_runtime,
• call runtimeKeepalivePush
• set Module.noExitRuntime

No matter which one I try, any substantial code that is called by my callback still crashes.

Am I on the right track at all? I am suspicious because I think Emscripten reuses workers in the pool when the code creates new threads. How to use the above methods and do they automatically prevent the worker from being reused for another thread?

[mmarczell-graphisoft]

Eventually I managed to make runtimeKeepalivePush work. The crashes were caused by other code.