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     */
013    package org.jikesrvm.mm.mmtk;
014    
015    import org.mmtk.plan.Plan;
016    import org.mmtk.plan.CollectorContext;
017    import org.mmtk.plan.MutatorContext;
018    import org.mmtk.plan.PlanConstraints;
019    import org.mmtk.utility.Log;
020    import org.mmtk.utility.options.Options;
021    
022    import org.jikesrvm.VM;
023    import org.jikesrvm.mm.mminterface.Selected;
024    import org.jikesrvm.scheduler.RVMThread;
025    
026    import org.vmmagic.pragma.*;
027    
028    /**
029     * This class contains interfaces to access the current plan, plan local and
030     * plan constraints instances.
031     */
032    @Uninterruptible public final class ActivePlan extends org.mmtk.vm.ActivePlan {
033    
034      private static SynchronizedCounter mutatorCounter = new SynchronizedCounter();
035    
036      @Override
037      @Inline
038      public Plan global() {
039        return Selected.Plan.get();
040      }
041    
042      @Override
043      @Inline
044      public PlanConstraints constraints() {
045        return Selected.Constraints.get();
046      }
047    
048      @Override
049      @Inline
050      public int collectorCount() {
051        return Options.threads.getValue();
052      }
053    
054      @Override
055      @Inline
056      public CollectorContext collector() {
057        return RVMThread.getCurrentThread().getCollectorContext();
058      }
059    
060      @Override
061      @Inline
062      public boolean isMutator() {
063        return !RVMThread.getCurrentThread().isCollectorThread();
064      }
065    
066      @Override
067      @Inline
068      public MutatorContext mutator() {
069        return Selected.Mutator.get();
070      }
071    
072      @Override
073      public Log log() {
074        if (VM.runningVM) {
075          return Selected.Mutator.get().getLog();
076        } else {
077          return buildLog;
078        }
079      }
080    
081      /** Log instance used at build time */
082      private static final Log buildLog = new Log();
083    
084      @Override
085      public void resetMutatorIterator() {
086        mutatorCounter.reset();
087      }
088    
089      @Override
090      public MutatorContext getNextMutator() {
091        for (;;) {
092          int idx = mutatorCounter.increment();
093          if (idx >= RVMThread.numThreads) {
094            return null;
095          } else {
096            RVMThread t=RVMThread.threads[idx];
097            if (t.activeMutatorContext) {
098              return t;
099            }
100          }
101        }
102      }
103    }