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Java Source Code / Java Documentation » Apache Harmony Java SE » java package » java.util.concurrent.atomic 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   java.util.concurrent.atomic.AtomicMarkableReference

AtomicMarkableReference
public class AtomicMarkableReference (Code)
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.
since:
   1.5
author:
   Doug Lea<
Parameters:
  V - > The type of object referred to by this reference




Constructor Summary
public  AtomicMarkableReference(V initialRef, boolean initialMark)
     Creates a new AtomicMarkableReference with the given initial values.

Method Summary
public  booleanattemptMark(V expectedReference, boolean newMark)
     Atomically sets the value of the mark to the given update value if the current reference is == to the expected reference.
public  booleancompareAndSet(V expectedReference, V 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.
public  Vget(boolean[] markHolder)
     Returns the current values of both the reference and the mark. Typical usage is boolean[1] holder; ref = v.get(holder); .
Parameters:
  markHolder - an array of size of at least one.
public  VgetReference()
     Returns the current value of the reference.
public  booleanisMarked()
     Returns the current value of the mark.
public  voidset(V newReference, boolean newMark)
     Unconditionally sets the value of both the reference and mark.
public  booleanweakCompareAndSet(V expectedReference, V 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.


Constructor Detail
AtomicMarkableReference
public AtomicMarkableReference(V initialRef, boolean initialMark)(Code)
Creates a new AtomicMarkableReference with the given initial values.
Parameters:
  initialRef - the initial reference
Parameters:
  initialMark - the initial mark




Method Detail
attemptMark
public boolean attemptMark(V expectedReference, boolean newMark)(Code)
Atomically sets the value of the mark 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.
Parameters:
  expectedReference - the expected value of the reference
Parameters:
  newMark - the new value for the mark true if successful



compareAndSet
public boolean compareAndSet(V expectedReference, V newReference, boolean expectedMark, boolean newMark)(Code)
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.
Parameters:
  expectedReference - the expected value of the reference
Parameters:
  newReference - the new value for the reference
Parameters:
  expectedMark - the expected value of the mark
Parameters:
  newMark - the new value for the mark true if successful



get
public V get(boolean[] markHolder)(Code)
Returns the current values of both the reference and the mark. Typical usage is boolean[1] holder; ref = v.get(holder); .
Parameters:
  markHolder - an array of size of at least one. On return,markholder[0] will hold the value of the mark. the current value of the reference



getReference
public V getReference()(Code)
Returns the current value of the reference. the current value of the reference



isMarked
public boolean isMarked()(Code)
Returns the current value of the mark. the current value of the mark



set
public void set(V newReference, boolean newMark)(Code)
Unconditionally sets the value of both the reference and mark.
Parameters:
  newReference - the new value for the reference
Parameters:
  newMark - the new value for the mark



weakCompareAndSet
public boolean weakCompareAndSet(V expectedReference, V newReference, boolean expectedMark, boolean newMark)(Code)
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. 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.
Parameters:
  expectedReference - the expected value of the reference
Parameters:
  newReference - the new value for the reference
Parameters:
  expectedMark - the expected value of the mark
Parameters:
  newMark - the new value for the mark true if successful



Methods inherited from java.lang.Object
protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object object)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final public Class<? extends Object> getClass()(Code)(Java Doc)
public int hashCode()(Code)(Java Doc)
final public void notify()(Code)(Java Doc)
final public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final public void wait(long millis, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait(long millis) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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