| 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 boolean | attemptMark(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 boolean | compareAndSet(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 V | get(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 V | getReference()
Returns the current value of the reference. | | public boolean | isMarked()
Returns the current value of the mark. | | public void | set(V newReference, boolean newMark)
Unconditionally sets the value of both the reference and mark. | | public boolean | weakCompareAndSet(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. |
| 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 |
| 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.
May fail spuriously
and does not provide ordering guarantees, so is only rarely an
appropriate alternative to
compareAndSet .
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 |
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