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Started by sukishan, Sep 04, 2009, 09:48 PM

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package java.lang;

import System.LocalDataStoreSlot;

public class InheritableThreadLocal extends ThreadLocal
   private static final Object NOT_INIT = new Object();
   private Thread rootThread;
   private Object rootValue;

   public InheritableThreadLocal()
      rootThread = Thread.currentThread();
      rootValue = NOT_INIT;

   private boolean isRoot()
      return Thread.currentThread().equals(rootThread);

   private Object getRootValue()
      if (rootValue == NOT_INIT)
         rootValue = super.get();
      return rootValue;

   private void setRootValue(Object value)
      this.rootValue = value;

   public synchronized Object get()
      if (!isRoot())
         Object o = System.Threading.Thread.GetData(slot);
         if (o == null)
            o = childValue(getRootValue());
            System.Threading.Thread.SetData(slot, o);
      return super.get();

   public synchronized void set(Object value)
      if (value == null)
         value = NULL;
      System.Threading.Thread.SetData(slot, value);
      if (isRoot())

   protected Object childValue(Object parentValue)
      return parentValue;
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