AtomicStampedReference JDK 1.6)

public boolean attemptStamp ( V expectedReference, int newStamp)

Atomically sets the value of the stamp to the given update value if the current reference is == to the expected reference.

Atomically sets the value of the stamp to the given update value
if the current reference is == 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.
Returns: true if successful
Parameters:
- expectedReference - the expected value of the reference
- newStamp - the new value for the stamp

public boolean compareAndSet ( V expectedReference, V 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.

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.
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

public V get (int[] stampHolder)

Returns the current values of both the reference and the stamp.

Returns the current values of both the reference and the stamp.
Typical usage is int[1] holder; ref = v.get(holder); .
Returns: the current value of the reference
Parameters:
- stampHolder - an array of size of at least one. On return, {@code stampholder[0]} will hold the value of the stamp.

public V getReference ()

Returns the current value of the reference.

public int getStamp ()

Returns the current value of the stamp.

public void set ( V newReference, int newStamp)

Unconditionally sets the value of both the reference and stamp.

public boolean weakCompareAndSet ( V expectedReference, V 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.

May fail spuriously and does not provide ordering guarantees, so is only rarely an appropriate alternative to compareAndSet.
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