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java.lang.Objectedu.emory.mathcs.backport.java.util.concurrent.atomic.AtomicStampedReference
An AtomicStampedReference maintains an object reference along with an integer "stamp", that can be updated atomically.
Implementation note. This implementation maintains stamped references by creating internal objects representing "boxed" [reference, integer] pairs.
Constructor Summary | |
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AtomicStampedReference(java.lang.Object initialRef,
int initialStamp)
Creates a new AtomicStampedReference with the given initial values. |
Method Summary | |
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boolean |
attemptStamp(java.lang.Object expectedReference,
int newStamp)
Atomically sets the value of the stamp to the given update value if the current reference is == to the expected reference. |
boolean |
compareAndSet(java.lang.Object expectedReference,
java.lang.Object newReference,
int expectedStamp,
int newStamp)
Atomically sets the value of both the reference and stamp to the given update values if the current reference is == to the expected reference and the current stamp is equal to the expected stamp. |
java.lang.Object |
get(int[] stampHolder)
Returns the current values of both the reference and the stamp. |
java.lang.Object |
getReference()
Returns the current value of the reference. |
int |
getStamp()
Returns the current value of the stamp. |
void |
set(java.lang.Object newReference,
int newStamp)
Unconditionally sets the value of both the reference and stamp. |
boolean |
weakCompareAndSet(java.lang.Object expectedReference,
java.lang.Object newReference,
int expectedStamp,
int newStamp)
Atomically sets the value of both the reference and stamp to the given update values if the current reference is == to the expected reference and the current stamp is equal to the expected stamp. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public AtomicStampedReference(java.lang.Object initialRef, int initialStamp)
initialRef
- the initial referenceinitialStamp
- the initial stampMethod Detail |
public java.lang.Object getReference()
public int getStamp()
public java.lang.Object get(int[] stampHolder)
stampHolder
- an array of size of at least one. On return,
stampholder[0] will hold the value of the stamp.
public boolean weakCompareAndSet(java.lang.Object expectedReference, java.lang.Object newReference, int expectedStamp, int newStamp)
expectedReference
- the expected value of the referencenewReference
- the new value for the referenceexpectedStamp
- the expected value of the stampnewStamp
- the new value for the stamp
public boolean compareAndSet(java.lang.Object expectedReference, java.lang.Object newReference, int expectedStamp, int newStamp)
expectedReference
- the expected value of the referencenewReference
- the new value for the referenceexpectedStamp
- the expected value of the stampnewStamp
- the new value for the stamp
public void set(java.lang.Object newReference, int newStamp)
newReference
- the new value for the referencenewStamp
- the new value for the stamppublic boolean attemptStamp(java.lang.Object expectedReference, int newStamp)
expectedReference
- the expected value of the referencenewStamp
- the new value for the stamp
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