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Phillip Toland seems to have an eery view into my mind, shown by his article Are Native Threads Worth It? The future of native threading support in Ruby (as compared to the userspace threading that is used now), seems to be a bit uncertain. The Matz and Koichi interview he links to, shows that the threading story for 1.9 isn‘t quite decided yet. Even if it stays that way, having native threads with a big interpreter lock isn‘t too appealing. (The interpreter lock means that only one thread can run at a time, although there are APIs in YARV that allow to work around that).