I’ve just discovered a language called Sisal, developed in the early ’80s, which was based on the same ideas that inspired Radian. It was quickly forgotten, as most languages are, but a group of students resurrected it in 2010 and built a fine-grained parallelism backend for it, based on pthreads. Which was, again, the whole point of Radian. It looks like they pulled it off about a year before I got Radian doing the same tricks, but the project seems to have lapsed back into obscurity.
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