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Fri May 8 15:33:55 CEST 2009

forcing + sync

How to make sure that an expression that needs an update won't get
updated twice by two different threads?  Let's do this for
force-dynamic instead of force.

A node can be in these states:

* not accessed
* cache check
* cache update

It's probably simplest to use a semaphore for this.  syn



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