ThinkerQAQ

4.CAS

Java · 2 notes

  1. 6.4 CAShistorical

    1. What it is. To understand CAS, first understand optimistic and pessimistic locking. 1.1. Optimistic vs. pessimistic locking. 1.2. CAS. 2. How to use it.

  2. 6.43 Atomichistorical

    1. What it is. Thread-safe atomic classes implemented with CAS. 2. Usage, using AtomicInteger as an example. 3. Principle analysis. 4. Problems with AtomicInteger: high CPU usage and the ABA problem, plus a version-number solution with AtomicStampedReference.