Preference Locks
Note: Before reading further be sure to read the introductory tutorial. With the new lock and its implementation introduced in version 1.1 there now is the possibility to prefer certain lock request. If a lock is not directly available a preferred lock request will be fulfilled before any other request that is not preferred. Putting preferences on certain lock levels is what the read/write lock manager and the read/write/upgrade lock manager with their respective implementations for read/write and upgrade locks do. For full flexibility there is an option to specify preference for any locking request both in the lock manager as well as in the lock.