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Multithreading and coroutines are different concepts though in practice they may end up being the same thing.

Coroutines were invented surprisingly enough, for lexing and parsing[0].

[0] http://melconway.com/Home/pdf/compiler.pdf

Edit1: added source. I'm surprised Melvin Conway is still alive

Interesting information. Thank you for the link, I'll have to take a look.

Though, the "in practice" part is the thing that gets me. I can see how the code might be easier to read but performance wise it seems like a lot of overhead since the coroutines are unlikely to be doing things like waiting for I/O.

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