edu.emory.mathcs.backport.java.util.concurrent.atomic
public class AtomicStampedReference extends Object
Implementation note. This implementation maintains stamped references by creating internal objects representing "boxed" [reference, integer] pairs.
Since: 1.5
Constructor Summary | |
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AtomicStampedReference(Object initialRef, int initialStamp)
Creates a new {@code AtomicStampedReference} with the given
initial values.
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Method Summary | |
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boolean | attemptStamp(Object expectedReference, int newStamp)
Atomically sets the value of the stamp to the given update value
if the current reference is {@code ==} to the expected
reference. |
boolean | compareAndSet(Object expectedReference, 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 {@code ==} to the expected reference
and the current stamp is equal to the expected stamp.
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Object | get(int[] stampHolder)
Returns the current values of both the reference and the stamp.
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Object | getReference()
Returns the current value of the reference.
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int | getStamp()
Returns the current value of the stamp.
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void | set(Object newReference, int newStamp)
Unconditionally sets the value of both the reference and stamp.
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boolean | weakCompareAndSet(Object expectedReference, 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 {@code ==} to the expected reference
and the current stamp is equal to the expected stamp.
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Parameters: initialRef the initial reference initialStamp the initial stamp
Parameters: expectedReference the expected value of the reference newStamp the new value for the stamp
Returns: true if successful
Parameters: expectedReference the expected value of the reference newReference the new value for the reference expectedStamp the expected value of the stamp newStamp the new value for the stamp
Returns: true if successful
Parameters: stampHolder an array of size of at least one. On return, {@code stampholder[0]} will hold the value of the stamp.
Returns: the current value of the reference
Returns: the current value of the reference
Returns: the current value of the stamp
Parameters: newReference the new value for the reference newStamp the new value for the stamp
May fail spuriously and does not provide ordering guarantees, so is only rarely an appropriate alternative to {@code compareAndSet}.
Parameters: expectedReference the expected value of the reference newReference the new value for the reference expectedStamp the expected value of the stamp newStamp the new value for the stamp
Returns: true if successful