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CAS (Compare and set)很好用，但是也有问题：1、CAS 本质上是自旋锁，在锁竞争比较激烈的情况下或者单核 CPU 的情况下，性能并不高。2、存在 ABA 问题，可能导致数据不一致。本文介绍了 ABA 问题的原因以及使用 AtomicStampedReference 解决该问题的方法。
Aba
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