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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Emacs Lisp and Guile
Date: Fri, 9 Aug 2002 10:39:09 -0600 (MDT)
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      However, there is no way to prevent 'yield' or
    SCM_TICK from switching during critical sections.

I'm not sure I understand that properly.  If we avoid calling yield
or SCM_TICK within critical sections, won't that prevent thread
switches within critical sections?