On Wed, Dec 29, 2010 at 5:13 AM, nicolas.o...@gmail.com
<nicolas.o...@gmail.com> wrote:
> I never was fully convinced an atom around a functional hash was
> perfect for concurrency.
>
> There is no write/write or read/write concurrency possible, even on
> independent data.

There is if you resort to (mutable)
java.util.concurrent.ConcurrentHashMap, which I've even had occasion
to use in a Clojure project when I needed finer lock/retry granularity
than the whole map and for whatever reason reads and (commute mapref
assoc ...) didn't suffice to cover all the use-cases.

> Someone was working a while ago ob TransactionalHashMap, if I recall well.
> Is there something already to benchmark against java?

Is this something like a persistent immutable ConcurrentHashMap? Or
maybe a map integrated with the ref world in some way? Or both?

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