What is the ABA problem in compare-and-swap (CAS) operations and how does `AtomicStampedReference` solve it?

Java Professional Hard

Java Professional — Hard

What is the ABA problem in compare-and-swap (CAS) operations and how does `AtomicStampedReference` solve it?

Key points

  • `AtomicStampedReference` prevents ABA by tracking changes with a version stamp
  • ABA problem arises when a value is altered twice but seems unchanged
  • The version stamp in `AtomicStampedReference` helps in identifying changes even if the value reverts back
  • `AtomicStampedReference` provides a solution to the ABA problem in CAS operations

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