Patch: wake up duchainlock writers

David Nolden zwabel at
Mon Dec 14 23:24:29 UTC 2009

I've re-implemented the duchain locking now using a spin-lock behavior, which 
makes the locking much faster at least in the single-threaded case.

The sleeping interval (for writers and readers alike) now is 500 nanoseconds, 
maybe that is enough to warrant a good multi-threaded behavior?

Greetings, David

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