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Berkeley DB Reference Guide:
  Upgrading Berkeley DB Applications

# Release 3.2: DB_ENV->set_mutexlocks

Previous Berkeley DB releases included the db_env_set_mutexlocks interface, intended for debugging, that allows applications to always obtain requested mutual exclusion mutexes without regard for their availability. This interface has been replaced with DB_ENV->set_mutexlocks, which provides the same functionality on a per-database environment basis. Applications using the old interface should be updated to use the new one.

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