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pthread fast mutexes

From: Kevin Ryde
Subject: pthread fast mutexes
Date: Tue, 24 Feb 2004 07:16:50 +1000
User-agent: Gnus/5.110002 (No Gnus v0.2) Emacs/21.3 (gnu/linux)

In the current cvs on my i386 debian,

        (unlock-mutex (make-mutex))

gives a seg fault.

I'm guessing it's because make-mutex uses a pthread fast mutex, and
that style means no error checking by the unlock.

Maybe the scheme level functions will need to use the "normal" mutexes
so the above can throw an exception.  Or is there some other theory on

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