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Hi, I know there are a lot of locking questions already but anyway:
In my database class, I have several resources, such as the list of records, the list of reserved records and the random access file used to access the database binary file. At the moment I am controlling access to all of these using a single Reentrant lock. If I need access to any of these 3 resources, I use this one lock. I also have a single Condition that is used together with this lock. This simplifies the locking and makes it easier to track down deadlocking.
I just have one doubt: Would it be better to have a Reentrant lock for each of the 3 resources, and lock on all 3? This would make it clear which resources are being locked. - My only doubt is that 3 nested locks might not be necessary and might be bad style..
IMO it's advisable to use separate locks for each resource. No sense in having a thread block on a lock if it's being locked for a resource it's not even interested in. This is not bad form. Hope this helps.