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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Threads in emacs implementation
Date: Thu, 09 Jun 2005 10:40:38 -0400
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    The greatest obstacle to this seems to be shallow binding - you'd have
    to unwind one thread's stack and rewind another's when switching
    threads.  Maybe there's an easier way that I don't see...

That is how the Lisp Machine worked.  It is not an unreasonable idea.