A deep dive into Project Loom's virtual threads (JEP 425) covering how they differ from platform threads, scheduling via a dedicated ForkJoinPool, memory management using heap-stored stack chunk objects, mounting/unmounting/capturing/pinning behavior, and observability via JFR and jcmd. Practical advice includes avoiding thread pools in favor of direct virtual thread creation, replacing synchronized blocks with ReentrantLock to prevent pinning, using semaphores for resource limiting, and reconsidering thread-local variable usage at scale.
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