I was just googling to see if there's any Emscripten/WASM implementation of OpenMP. The emscripten github issue [1] has a link to this "simpleomp" [2][3] where

> In ncnn project, we implement a minimal openmp runtime for webassembly target

> It only works for #pragma omp parallel for num_threads(N)

[1] https://github.com/emscripten-core/emscripten/issues/13892

[2] https://github.com/Tencent/ncnn/blob/master/src/simpleomp.h

[3] https://github.com/Tencent/ncnn/blob/master/src/simpleomp.cp...