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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/01-pinning-jdk21-pre-jep491.txt
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$ java -version
openjdk version "21.0.10" 2026-01-20
OpenJDK Runtime Environment (build 21.0.10+7-Ubuntu-124.04)
OpenJDK 64-Bit Server VM (build 21.0.10+7-Ubuntu-124.04, mixed mode, sharing)
$ java -Djdk.tracePinnedThreads=full com.ankurm.locks.VirtualThreadPinningDemo
VirtualThread[#18]/runnable@ForkJoinPool-1-worker-1 reason:MONITOR
java.base/java.lang.VirtualThread$VThreadContinuation.onPinned(VirtualThread.java:199)
java.base/jdk.internal.vm.Continuation.onPinned0(Continuation.java:393)
java.base/java.lang.VirtualThread.parkNanos(VirtualThread.java:635)
java.base/java.lang.VirtualThread.sleepNanos(VirtualThread.java:807)
java.base/java.lang.Thread.sleep(Thread.java:507)
com.ankurm.locks.VirtualThreadPinningDemo.lambda$main$0(VirtualThreadPinningDemo.java:25) <== monitors:1
java.base/java.lang.VirtualThread.run(VirtualThread.java:329)
Virtual thread finished. (No output above this line means it did not pin.)