Day 54: Thread Pinning: The Loom Achilles' Heel.

Описание: Internalize the Mechanics: Understand the relationship between Virtual Threads (user-mode) and Carrier Threads (kernel-mode).

Identify the Trigger: Pinpoint the two specific conditions that cause pinning: synchronized blocks and native method calls during blocking I/O.

Analyze Performance Impact: Comprehend how pinning causes "carrier thread starvation," effectively reverting lightweight threads back to heavyweight resource consumers.

Master Diagnostic Tools: Learn to interpret JVM thread dumps to distinguish between a healthy "parked" virtual thread and a problematic "pinned" one.

Implement Best Practices: Acquire the technical skill to refactor legacy synchronization into Loom-friendly concurrency using java.util.concurrent utilities.