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promises mutex

From: Kevin Ryde
Subject: promises mutex
Date: Mon, 06 Sep 2004 11:39:17 +1000
User-agent: Gnus/5.110003 (No Gnus v0.3) Emacs/21.3 (gnu/linux)

Is there a theory on having a mutex for each promise?

I see it has the effect of preventing two threads simultaneously
forcing, but I wonder if it'd be easier to allow that, just a single
mutex to protect the final store of the result.

This would be smaller and faster, and might even be beneficial for
some crazy cross-thread recursive forcing.  It'd be in keeping with
leaving most syncing up to the application (ie. allowing most anything
not actively harmful).

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