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Préférences
Moteurs de recherche
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JavaTM 2 Platform Std. Ed. v1.6.0
java.util.concurrent.atomic
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Constructor Summary | |
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AtomicStampedReference(V initialRef,
int initialStamp)
Creates a new AtomicStampedReference with the given
initial values. |
Method Summary | |
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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. |
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. |
V |
get(int[] stampHolder)
Returns the current values of both the reference and the stamp. |
V |
getReference()
Returns the current value of the reference. |
int |
getStamp()
Returns the current value of the stamp. |
void |
set(V newReference,
int newStamp)
Unconditionally sets the value of both the reference and stamp. |
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. |
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 AtomicStampedReference(V initialRef, int initialStamp)
AtomicStampedReference
with the given
initial values.
initialRef
- the initial referenceinitialStamp
- the initial stampMethod Detail |
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public V getReference()
public int getStamp()
public V get(int[] stampHolder)
int[1] holder; ref = v.get(holder);
.
stampHolder
- an array of size of at least one. On return,
stampholder[0]
will hold the value of the stamp.
public boolean weakCompareAndSet(V expectedReference, V newReference, int expectedStamp, int newStamp)
==
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
.
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(V expectedReference, V newReference, int expectedStamp, int newStamp)
==
to the expected reference
and the current stamp is equal to the expected stamp.
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(V newReference, int newStamp)
newReference
- the new value for the referencenewStamp
- the new value for the stamppublic boolean attemptStamp(V expectedReference, int newStamp)
==
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.
expectedReference
- the expected value of the referencenewStamp
- the new value for the stamp