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Promotable read-lock

Rob
Hi,

do you know any any Java implementation of an improved read-write lock
that can give three kind of locks:
- Read
- Write
- Promotable Read

The read and write locks are as usual.
The promotable read lock can be used when you have to do a lot of
reading and maybe you need to write something too. So the promotable
read lock can be upgraded to a write lock in an atomic operation.
Therefore only one promotable read-lock exists at the same time, like a
write lock.
Jul 17 '05 #1
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