edu.utah.janosvm.resources
Class GCPolicy

java.lang.Object
  |
  +--edu.utah.janosvm.resources.GCPolicy

public class GCPolicy

extends java.lang.Object

Base class for objects that implement a specific policy for the GC.

Author:

Tim Stack, Utah Janos Team

Field Summary

protected long

max The maximum amount of memory available to this GC.

Constructor Summary

private	GCPolicy()
	GCPolicy(long max) Construct a GCPolicy object with the given values.

Method Summary

static GCPolicy	currentPolicy()
boolean	enable() The enable function is called just before the team is finished being initialized, so you have a chance to do something, like start the GC and finalizer threads.
long	initialTrigger()
long	newTrigger(long used, long freed) This function is called after a GC happened to determine the next time to do a GC.
boolean	startThreads()
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait, wait0

Field Detail

max

protected final long max

The maximum amount of memory available to this GC.

Constructor Detail

GCPolicy

private GCPolicy()

GCPolicy

public GCPolicy(long max)

Construct a GCPolicy object with the given values.

Parameters:

max - The maximum amount of memory available to the GC.

Method Detail

startThreads

public boolean startThreads()

Returns:

true if the GC was successful in starting all of its threads.

enable

public boolean enable()

The enable function is called just before the team is finished being initialized, so you have a chance to do something, like start the GC and finalizer threads.

Returns:

True if the enable was successful, false otherwise.

initialTrigger

public long initialTrigger()

Returns:

The initial number that should be used when trying to decide whether to do a GC or allocate more memory from the OS.

newTrigger

public long newTrigger(long used,
                       long freed)

This function is called after a GC happened to determine the next time to do a GC. The default is 1 1/3 times the current amount used.

Parameters:

used - The current amount of memory used.

freed - (Bogus at this time I think).

Returns:

The new trigger for the GC.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

currentPolicy

public static GCPolicy currentPolicy()

Returns:

The GCPolicy for the current team.