interruptible locking doesn't work
----------------------------------

                 Key: CDV-893
                 URL: https://jira.terracotta.org/jira//browse/CDV-893
             Project: Community Development
          Issue Type: Bug
          Components: DSO:L1
            Reporter: Catalin Cirstoiu
            Assignee: Issue Review Board
         Attachments: InterruptibleLocking2.java, tc-config.xml

Doing thread.interrupt() on a thread trying to acquire a shared lock with 
lockInterruptibly() doesn't release the blocked thread as it happens in a 
non-clustered environment. This happens both for ReentrantLock and 
ReentrantReadWriteLock.

The workaround consists in using a custom made interruptible lock based on two 
reentrant locks and a condition variable (await-ing on a condition is 
interrupted on thread.interrupt()).

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