experimental BerkeleyDB Concurrent Data Store code committed to CVS

[Matthias Andree]

Hello,

I have committed experimental BerkeleyDB Concurrent Data Store code to
CVS - it uses BerkeleyDB environments, locking and memory pools
(shared) and is a first step towards the BerkeleyDB Transactional Data
Store (which would then help prevent data base corruption).

It is still safe to use the CVS code, because the new code is not
enabled unless you define the environment variable
BF_EXPERIMENTAL_DBENV.

Feedback is sought, documentation will be found in README.experimental
after "cvs update".

Please report your findings if you use the new code, if you have spare
time, benchmark it in comparison against the old code, and with
concurrent access (like registering new mail while another process
is scoring mail).

Thanks,

-- 
Matthias Andree

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