Name: krT82822 Date: 03/05/99


The following code works as expected when setting JAVA_COMPILER
to NONE. The expected behavior is that the Ref objekt eventually
gets finalized and the PhantomReference gets added to the
ReferenceQueue. When using the default JIT, the for loop keeps
looping. The reference held by the PhantomReference never
gets finalized. If I change the line towards the end of the
loop which sets 'r = null;' to 'r = new Ref(i++);' the object
pointed to by the PhantomReference gets finilized and garbage
collected.

import java.lang.ref.*;

public class Ref {

  protected static ReferenceQueue refQ;

  protected int id;
  protected byte[] b;
  protected volatile static Ref r;

  public static void main(String[] args) throws Exception {
    byte[] b;
    PhantomReference pRef;
    Reference test;
    int i = 0;

    refQ = new ReferenceQueue();
    pRef = new PhantomReference(r = new Ref(i++), refQ);

    for(;;) {
      b = new byte[200000];
      test = refQ.poll();
      if(test != null)
        break;
      r = null;
    }
  }

  public Ref(int id) {
    this.id = id;
    this.b = new byte[100000];
  }
  public String toString() {
    return "Ref: " + id;
  }
  protected void finalize() throws Throwable {
    System.out.println("finilizing: " + this);
    super.finalize();
  }
}
(Review ID: 54005)
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