locks: synchronized vs ReentrantLock vs StampedLock companion code

JMH throughput sweep (1-64 threads), 9:1 read-heavy @Group benchmark,
tryLock(timeout) deadlock-avoidance demo, and a JDK21-vs-JDK25 JEP 491
virtual-thread-pinning comparison. Also promotes LICENSE to repo root
now that a second module exists.
This commit is contained in:
2026-09-30 06:04:50 +00:00
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Test set: com.ankurm.locks.CounterCorrectnessTest
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Tests run: 4, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.218 s -- in com.ankurm.locks.CounterCorrectnessTest