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Check out Luv - an attempt to use Lua's coroutines to do green threads/fibers, integrated with libuv.

luv does a fantastic job of sticking with Lua coroutines. The master branch still has zeromq in it, but the latest work is done in the ray branch. Sadly, it doesn't seem the project is moving, so most of the libuv features are not yet implemented the "ray" way.

Edit: Seems ray does have most of libuv features, sorry.

Yeah I never really understood luvit. Callbacks make sense in JavaScript because it doesn't have coroutines. But Lua has coroutines! So why does luvit use callbacks? It does seem like a step backward.

Historical reasons. The guy who wrote luvit knew NodeJS but didnt know Lua when he started working on it.

and node-fibers :o