Provide an OS independent way to set/get UV_THREADPOOL_SIZE about libuv HOT 8 OPEN

Maybe uv_os_setenv ? https://docs.libuv.org/en/v1.x/misc.html#c.uv_os_setenv

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I can investigate on this one.

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Maybe uv_os_setenv ? https://docs.libuv.org/en/v1.x/misc.html#c.uv_os_setenv

Yeah, looks like I missed it :D

Anyway, having a native API would be still better rather than dealing with env.

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A native API would not be very reliable really, because just setting the env var doesn't do anything if the threadpool has already been started anyway...

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That's the point. uv_set_thread_num can return 0 if the thread pool is not running yet, and it was able to update the configuration.
If the thread pool is already running, we can return an error (<0).

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SGTM. Ping @libuv/collaborators

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SGRM. setenv is also thread-unsafe by design in posix, so it is good to have safe alternatives

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Go for it!

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