asmhatreandClaude Sonnet 5
55ee850a75
One three-round worker pipeline implemented with CountDownLatch (one latch per round), CyclicBarrier (reusable, with a barrier action), and Phaser (reusable, plus dynamic mid-run registration), alongside Semaphore solving the genuinely different problem of bounding concurrent access. Covers timeout behavior (CyclicBarrier permanently breaks on one timeout, Phaser doesn't) and virtual-thread compatibility, including the corrected finding that Object.wait() releases its monitor and never pinned, unlike Thread.sleep() inside synchronized. Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01FhzLY5p6okFva3qsnsRyvM
26 lines
1.4 KiB
Plaintext
26 lines
1.4 KiB
Plaintext
$ java -Djdk.tracePinnedThreads=full VirtualThreadCompatibilityDemo (pre-JDK-24 runtime)
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java.version=21.0.10
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jdk.tracePinnedThreads=full
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CountDownLatch.await(): completed, no trace above this line for it
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CyclicBarrier.await(): completed, no trace above this line for it
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Phaser.arriveAndAwaitAdvance(): completed, no trace above this line for it
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Semaphore.acquire(): completed, no trace above this line for it
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done - no pinning trace printed above for any of the four
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$ java -Djdk.tracePinnedThreads=full SynchronizedWaitPinsDemo (pre-JDK-24 runtime, contrast case)
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java.version=21.0.10
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jdk.tracePinnedThreads=full
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synchronized + Object.wait(): completed, no pinning trace above this line for it
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VirtualThread[#21]/runnable@ForkJoinPool-1-worker-1 reason:MONITOR
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java.base/java.lang.VirtualThread$VThreadContinuation.onPinned(VirtualThread.java:199)
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java.base/jdk.internal.vm.Continuation.onPinned0(Continuation.java:393)
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java.base/java.lang.VirtualThread.parkNanos(VirtualThread.java:635)
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java.base/java.lang.VirtualThread.sleepNanos(VirtualThread.java:807)
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java.base/java.lang.Thread.sleep(Thread.java:507)
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com.ankurm.synchronizers.SynchronizedWaitPinsDemo.lambda$main$1(SynchronizedWaitPinsDemo.java:48) <== monitors:1
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java.base/java.lang.VirtualThread.run(VirtualThread.java:329)
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synchronized + Thread.sleep(): completed, pinning trace (if any) appears above this line for it
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done
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