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java.lang.Objectedu.emory.mathcs.backport.java.util.concurrent.atomic.AtomicMarkableReference
public class AtomicMarkableReference
An 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 Summary | |
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AtomicMarkableReference(java.lang.Object initialRef,
boolean initialMark)
Creates a new AtomicMarkableReference with the given initial values. |
Method Summary | |
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boolean |
attemptMark(java.lang.Object expectedReference,
boolean newMark)
Atomically sets the value of the mark to the given update value if the current reference is == to the expected reference. |
boolean |
compareAndSet(java.lang.Object expectedReference,
java.lang.Object newReference,
boolean expectedMark,
boolean newMark)
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. |
java.lang.Object |
get(boolean[] markHolder)
Returns the current values of both the reference and the mark. |
java.lang.Object |
getReference()
Returns the current value of the reference. |
boolean |
isMarked()
Returns the current value of the mark. |
void |
set(java.lang.Object newReference,
boolean newMark)
Unconditionally sets the value of both the reference and mark. |
boolean |
weakCompareAndSet(java.lang.Object expectedReference,
java.lang.Object newReference,
boolean expectedMark,
boolean newMark)
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. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public AtomicMarkableReference(java.lang.Object initialRef, boolean initialMark)
initialRef
- the initial referenceinitialMark
- the initial markMethod Detail |
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public java.lang.Object getReference()
public boolean isMarked()
public java.lang.Object get(boolean[] markHolder)
markHolder
- an array of size of at least one. On return,
markholder[0] will hold the value of the mark.
public boolean weakCompareAndSet(java.lang.Object expectedReference, java.lang.Object newReference, boolean expectedMark, boolean newMark)
expectedReference
- the expected value of the referencenewReference
- the new value for the referenceexpectedMark
- the expected value of the marknewMark
- the new value for the mark
public boolean compareAndSet(java.lang.Object expectedReference, java.lang.Object newReference, boolean expectedMark, boolean newMark)
expectedReference
- the expected value of the referencenewReference
- the new value for the referenceexpectedMark
- the expected value of the marknewMark
- the new value for the mark
public void set(java.lang.Object newReference, boolean newMark)
newReference
- the new value for the referencenewMark
- the new value for the markpublic boolean attemptMark(java.lang.Object expectedReference, boolean newMark)
expectedReference
- the expected value of the referencenewMark
- the new value for the mark
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