org.mmtk.vm

Class ReferenceProcessor

java.lang.Object

org.mmtk.vm.ReferenceProcessor

Direct Known Subclasses:

ReferenceProcessor

public abstract class ReferenceProcessor
extends Object

This class manages SoftReferences, WeakReferences, and PhantomReferences.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ReferenceProcessor.Semantics

Constructor Summary

Constructors

Constructor and Description
ReferenceProcessor()

Method Summary

Modifier and Type	Method and Description
abstract void	clear() Clear the contents of the table.
abstract int	countWaitingReferences()
abstract void	forward(TraceLocal trace, boolean nursery) Iterate over all references and forward.
abstract void	scan(TraceLocal trace, boolean nursery, boolean retain) Scan through the list of references.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ReferenceProcessor

public ReferenceProcessor()

Method Detail

clear

public abstract void clear()

Clear the contents of the table. This is called when reference types are disabled to make it easier for VMs to change this setting at runtime.

scan

public abstract void scan(TraceLocal trace,
                          boolean nursery,
                          boolean retain)

Scan through the list of references.

Parameters:

trace - the thread local trace element.

nursery - true if it is safe to only scan new references.

retain - whether to retain those references whose referents are not reachable

forward

public abstract void forward(TraceLocal trace,
                             boolean nursery)

Iterate over all references and forward.

Parameters:

trace - The MMTk trace to forward to

nursery - The nursery collection hint

countWaitingReferences

public abstract int countWaitingReferences()

Returns:

the number of references objects on the queue