What is the JVM’s safepoint and why does Stop-the-World GC require all threads to reach one?

Explanation

The JVM's safepoint is a point in execution where thread state is fully known and consistent, allowing the JVM to safely inspect or modify the heap. Stop-the-World GC requires all threads to reach a safepoint to freeze them while relocating or marking objects without interference.

Key points

Safepoints ensure thread state consistency for GC
Stop-the-World GC freezes all threads at safepoints
Threads must reach safepoints for GC to safely operate

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