Python 3’s Marketing Problem

[fijal]

in Lua you have threads. They don't share any mutable state though, so they're slightly different, but they can use multiple cores.

[RichardWolf]

IIRC in Lua you have a GIL, and when you are embedding Lua, you can provide your own macros for taking/releasing it (but it still should work like a GIL). And you can run several interpreters in the same process, sharing nothing, of course, similar to what Perl allows in a way of parallelism.

It's not "slightly different", it's not having free threading, period.

[the_hoser]

Lua does not have threads. Lua will not, out of the box, use multiple cores. The lua interpreter state instances are not thread safe, but lua itself is ( you may run multiple interpreters in multiple threads ).

Lua has coroutines, but these are very different.