001/*
002 *  This file is part of the Jikes RVM project (http://jikesrvm.org).
003 *
004 *  This file is licensed to You under the Eclipse Public License (EPL);
005 *  You may not use this file except in compliance with the License. You
006 *  may obtain a copy of the License at
007 *
008 *      http://www.opensource.org/licenses/eclipse-1.0.php
009 *
010 *  See the COPYRIGHT.txt file distributed with this work for information
011 *  regarding copyright ownership.
012 */
013package org.mmtk.plan.concurrent;
014
015import org.mmtk.plan.SimpleConstraints;
016import org.vmmagic.pragma.*;
017
018/**
019 * This class and its subclasses communicate to the host VM/Runtime
020 * any features of the selected plan that it needs to know.  This is
021 * separate from the main Plan/PlanLocal class in order to bypass any
022 * issues with ordering of static initialization.
023 */
024@Uninterruptible
025public abstract class ConcurrentConstraints extends SimpleConstraints {
026  @Override
027  public boolean needsConcurrentWorkers() {
028    return true;
029  }
030
031  @Override
032  public boolean needsObjectReferenceWriteBarrier() {
033    return true;
034  }
035
036  @Override
037  public boolean needsJavaLangReferenceReadBarrier() {
038    return true;
039  }
040
041  //@Override
042  // TODO public boolean needsStaticWriteBarrier() {
043  //  return true;
044  //}
045}