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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Does GNAT support a thread-free RTS?
Date: Sat, 10 Sep 2011 16:19:00 +0100
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Date: 2011-09-10T16:19:00+01:00
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It used to be that you could configure GNAT to use a tasking RTS that
didn't use threads; tasks were scheduled entirely within the RTS. I
think these may be called 'green threads'[1]. Of course, this meant that
blocking on I/O would block the whole program, but for some purposes it
might be ideal.

I don't see any trace of this in FSF GCC; has it gone for good?

[1] http://en.wikipedia.org/wiki/Green_threads