Discussion
Which of these correctly declares a stamped lock's optimistic read?
Answer: C
Correct answer: long stamp = sl.tryOptimisticRead();
An optimistic read returns a stamp rather than a lock, and no lock is actually taken - the reader does its work and then calls validate(stamp) to find out whether a writer intervened. A zero stamp means the attempt failed, and a failed validation means the work must be redone under a real read lock.
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