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"There are free implementations of Common Lisp (GCL, CMU Common Lisp, CLISP), but they came late and incomplete. "

SBCL is open source and free and complete and performs incredibly well with multi-threading etc. I wonder how old this article is?

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This is only true for SBCL on Linux, isn't it?

Besides Linux, SBCL supports multithreading on FreeBSD, Mac OS X, and Windows.

Last time I tried SBCL on FreeBSD, the binary package didn't have threads enabled, and when I compiled it from ports, the configuration dialog had me enable the threading manually and said it was "experimental".

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