V - The type of object referred to by this referencepublic class AtomicMarkableReference<V> extends Object
AtomicMarkableReference maintains an object reference along with a mark bit, that can be updated atomically. Implementation note: This implementation maintains markable references by creating internal objects representing "boxed" [reference, boolean] pairs.
| Constructor | Description |
|---|---|
AtomicMarkableReference |
Creates a new AtomicMarkableReference with the given initial values. |
| Modifier and Type | Method | Description |
|---|---|---|
boolean |
attemptMark |
Atomically sets the value of the mark to the given update value if the current reference is == to the expected reference. |
boolean |
compareAndSet |
Atomically sets the value of both the reference and mark to the given update values if the current reference is == to the expected reference and the current mark is equal to the expected mark. |
V |
get |
Returns the current values of both the reference and the mark. |
V |
getReference() |
Returns the current value of the reference. |
boolean |
isMarked() |
Returns the current value of the mark. |
void |
set |
Unconditionally sets the value of both the reference and mark. |
boolean |
weakCompareAndSet |
Atomically sets the value of both the reference and mark to the given update values if the current reference is == to the expected reference and the current mark is equal to the expected mark. |
public AtomicMarkableReference(V initialRef, boolean initialMark)
AtomicMarkableReference with the given initial values.initialRef - the initial referenceinitialMark - the initial markpublic V getReference()
public boolean isMarked()
public V get(boolean[] markHolder)
boolean[1] holder; ref = v.get(holder); .markHolder - an array of size of at least one. On return, markHolder[0] will hold the value of the mark.public boolean weakCompareAndSet(V expectedReference, V newReference, boolean expectedMark, boolean newMark)
== to the expected reference and the current mark is equal to the expected mark. This operation may fail spuriously and does not provide ordering guarantees, so is only rarely an appropriate alternative to compareAndSet.expectedReference - the expected value of the referencenewReference - the new value for the referenceexpectedMark - the expected value of the marknewMark - the new value for the marktrue if successfulpublic boolean compareAndSet(V expectedReference, V newReference, boolean expectedMark, boolean newMark)
== to the expected reference and the current mark is equal to the expected mark.expectedReference - the expected value of the referencenewReference - the new value for the referenceexpectedMark - the expected value of the marknewMark - the new value for the marktrue if successfulpublic void set(V newReference, boolean newMark)
newReference - the new value for the referencenewMark - the new value for the markpublic boolean attemptMark(V expectedReference, boolean newMark)
== to the expected reference. Any given invocation of this operation may fail (return false) spuriously, but repeated invocation when the current value holds the expected value and no other thread is also attempting to set the value will eventually succeed.expectedReference - the expected value of the referencenewMark - the new value for the marktrue if successful
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https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/concurrent/atomic/AtomicMarkableReference.html