[Bug-gnubg] Simple multi-threading...

[Jonathan Kinsey]

Happy new year to everyone!

I know a while ago there was a branch in cvs looking at multiple
evaluation threads, I'm not sure what happened to that and have written
some (relatively) simple code to multi-thread AnalyzeGame().

It seems to work ok, with a simple test taking 36secs rather than 61secs
 with the old code (on a dual core laptop).

There are a few small things to finish off, but the one thing I've
currently not done is the Take/Drop to Double link in AnalyseMove().
Basically the code remembers some evaluation info from a Double move
record and uses this on a subsequent Take/Drop move record.  I commented
this code out (as obviously the Take/Drop could be done at the same time
as the Double) and couldn't see what wasn't happening.  Does anyone have
more of an idea of what this code does, if it's important and can't be
removed I'll have to pass in the Double move record to AnalyseMove and
make sure that both move records are done together.

Assuming it all works it should be relatively easy to use the same code
in multiple evaluations/rollouts (although I've not looked or thought
about this yet).  Are there any other areas that might be worth
multi-threading?

Jon

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