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locks: synchronized vs ReentrantLock vs StampedLock companion code

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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.
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asmhatre
2026-09-30 06:04:50 +00:00
parent f548d9eeb5
commit 32b8067ecf
25 changed files with 763 additions and 6 deletions
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locks/output/03-trylock-timeout-deadlock-avoidance.txt
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$ java -cp target/classes com.ankurm.locks.TryLockTimeoutDemo
Thread-2: timed out waiting for second lock on attempt 1 - backing off and retrying.
Thread-1: timed out waiting for second lock on attempt 1 - backing off and retrying.
Thread-2: timed out waiting for second lock on attempt 2 - backing off and retrying.
Thread-1: timed out waiting for second lock on attempt 2 - backing off and retrying.
Thread-2: timed out waiting for second lock on attempt 3 - backing off and retrying.
Thread-1: acquired both locks on attempt 3.
Thread-2: acquired both locks on attempt 4.
Both threads finished in 808 ms - no deadlock.