WebUSB + libusb + pthreads about sane-wasm HOT 3 CLOSED

I would love for WebUSB to support multithreading natively as @reillyeon suggested it might be someday on the original thread (hehe, no pun intended), but meanwhile using Emscripten's proxying API sounds like a promising solution to fill that gap.

I think main thread instead of a dedicated thread is fine since WebUSB is already asynchronous and is not supposed to block the main thread for long anyway.

I don't have capacity to review the code right now but when you polish it up, I think it's worth creating a PR upstream on the libusb repo. When you do, please tag me and I'll try to take a look.

from sane-wasm.

My only note from a quick glance is that I'd probably try to extract some helper to avoid repeated duplication of thread ID checks & proxying or calling locally.

Also most (all?) libusb functions accept only one argument anyway so it might be cheaper to just pass the original function & argument directly as callback & argument to emscripten_proxy_sync instead of using another indirection with std::function in the task wrapper.

from sane-wasm.