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synchronizers: CountDownLatch vs CyclicBarrier vs Phaser vs Semaphore

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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
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asmhatre
2026-09-30 06:43:52 +00:00
co-authored by Claude Sonnet 5
parent 0819993c51
commit 55ee850a75
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synchronizers/output/04-semaphore-resource-guard.txt
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$ java SemaphoreResourceGuard
worker-0 round 1: acquired permit, 1 callers concurrently in the resource (availablePermits=0)
worker-1 round 1: acquired permit, 2 callers concurrently in the resource (availablePermits=0)
worker-2 round 1: acquired permit, 2 callers concurrently in the resource (availablePermits=0)
worker-3 round 1: acquired permit, 2 callers concurrently in the resource (availablePermits=0)
worker-3 round 2: acquired permit, 1 callers concurrently in the resource (availablePermits=1)
worker-0 round 2: acquired permit, 2 callers concurrently in the resource (availablePermits=0)
worker-1 round 2: acquired permit, 1 callers concurrently in the resource (availablePermits=1)
worker-2 round 2: acquired permit, 2 callers concurrently in the resource (availablePermits=0)
worker-2 round 3: acquired permit, 1 callers concurrently in the resource (availablePermits=1)
worker-3 round 3: acquired permit, 2 callers concurrently in the resource (availablePermits=0)
worker-0 round 3: acquired permit, 1 callers concurrently in the resource (availablePermits=1)
worker-1 round 3: acquired permit, 2 callers concurrently in the resource (availablePermits=0)
permits=2 maxObservedConcurrency=2
done