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4.2 Lock-Free CAS, Atomic Variables & LongAdder
Topic Summary
Eliminate thread contention bottlenecks with Compare-And-Swap (CAS) instructions and cell-striped LongAdder counters.
What You Will Learn
• Understand hardware CPU instructions: `CMPXCHG` (Compare-And-Swap).
• Compare `AtomicInteger` vs `LongAdder` under heavy concurrent writes.
• Eliminate false sharing and cache line bouncing using cell striping.
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