Rich Neswold ha scritto:

On Wed, Sep 24, 2008 at 4:17 PM, Manlio Perillo <manlio_perillo@libero.it <mailto:manlio_perillo@libero.it>> wrote:

   I need a simple, concurrent safe, database, written in Haskell.
   A database with the interface of Data.Map would be great, since what
   I need to to is atomically increment some integer values, and I
   would like to avoid to use SQLite.

How about  "MVar (Map k Int)"?  or even "Map k (MVar Int)"?

Yes, it is a solution; and I can run a thread that every N seconds writes the database to a file.

But this works only if the database is used by only one process.