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Ruby has real threads now.

Java had green threads back then.

By "real", I mean native and multi-core. Does that exist now? I think it exists in JRuby, but in MRI?

All major Ruby implementations use OS threads, but the GIL still limits parallelism in MRI.

MRI has native threads a GIL, but you can already release the GIL and run freely in native extensions.

And this is _not_ a property of native vs. green threading. (And shows how shallow the comparison is, given the number of languages that implement green threads mapped to native threads nowadays.)

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