boost progress bar

[Larry Kosher]

Dear list!
I have ported an existing C++ project using emscripten. The original
code used to output progress bar while the CPU intensive operation was
executed. However it doesn't work with wasm binary. The execution
starts, the output, and the whole tab is frozen and when the process
is finished all the results show up in the output with already 100%.
Is there a way to get the progress bar updates in real-time?
Thank you!
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[Alon Zakai]

Sounds like this might be due to not returning to the JS event loop, which will hang browsers? See

https://emscripten.org/docs/porting/emscripten-runtime-environment.html#browser-main-loop

and also

https://emscripten.org/docs/porting/asyncify.html#sleeping-yielding-to-the-event-loop

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