ReentrantLock.isLocked() returns incorrect value
------------------------------------------------
Key: CDV-859
URL: https://jira.terracotta.org/jira//browse/CDV-859
Project: Community Development
Issue Type: Bug
Affects Versions: 2.6.2
Reporter: Howard Mak
Assignee: Issue Review Board
Attachments: readwrite_lock_test.zip, simple_lock_test.zip
ReentrantLock.isLocked() returns false [instead of true] if the lock is a DSO
and is held by a thread. This problem also occurs for ReentrantReadWriteLock's.
Reproduce case:
---------------
Attached are 2 reproduce cases [originally reported by
http://forums.terracotta.org/forums/posts/list/0/1337.page].
Expected output [for both tests] is:
test 1: [isLocked=true].isLocked() is ok
test 2: [isLocked=true].tryLock() is ok
But Terracotta generates:
test 1: [isLocked=false].isLocked() is BAD!
test 2: [isLocked=false].tryLock() is ok
Possible workaround (not 100%):
-------------------------------
Use tryLock()/unlock() to emulate isLocked(), but this won't work if multiple
threads do this simultaneous on a non-locked ReentrantLock. Otherwise, avoid
ReentrantLock altogether if isLocked() needs to be accurate.
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