Locking/ Synchronization

Hi,
I�m using vector to hold all the locked records.
I�m wondering whether I should synchronize the lock and unlock methods. My concern is user B has to wait until user A completes lock method though user B is locking different record.
I really appreciate any suggestions.
Thanks

I would steer away from having user B wait until user A is finished with a different record.

Why are you holding the locked records in a vector, isn't
a better approach to synchronize on the row objects themselves?
Won't you have a problem that if a user locks a record and then gets disconnected due to a network problem, the row won't get
removed from the vector?