問題タブ [atomicinteger]

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java - Which AtomicInteger methods are test-and-set, fetch-and-add and compare-and-swap (in terms of lock-free algorithms)?

CAS (compare-and-swap) : boolean compareAndSet(int expect, int update)

FAA(fetch-and-add) : int addAndGet(int delta) ???

TAS (test-and-set) : ???

In my understanding:

CAS (compare-and-swap) "synchronizes" (w/o locks, on CPU instructions level) code like this:

FAA (fetch-and-add) : "synchronizes" (w/o locks, on CPU instructions level) code like this:

But I am not sure about what kind of code "test-and-set" related to.


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