Name: szC45993 Date: 01/15/99



The Tonga/src/nsk/thread/thread00103 test discovers the HotSpot VM (1.0beta1, core version, release build Jan 13 1999 12:43:10) error:

export CLASSPATH=".;c:\\zss\\classes_my"
cd C:/zss/TONGA_WSs/testbase_js/src/nsk/thread/thread00103
h:/ld25/java/dest/jdk1.1.6/win32/bin/javac.exe -d c:/zss/classes_my thread00103.java
c:/jdk1.2/bin/java -Xmixed -XX:+TraceLocking -XX:+LogMutexLocking -XX:+LogMultipleMutexLocking -XX:+LogEvents -verify thread00103
#
# HotSpot Virtual Machine Error, Unexpected exception occured
#
# EXCEPTION_ACCESS_VIOLATION#
[1] + Done(134) c:/jdk1.2/bin/java -Xmixed -XX:Flags=C:/zss/TONGA_WSs/testbase_js/src/nsk/thread/thread00103/gammarc.gammarc -verify thread00103
  94 Abort c:/jdk1.2/bin/java
$

SOURCES:

//--------------------- thread00103.java:

//thread00103.java
/* This test simply creates a series of circularly
 * linked memeory objects which should be able to be
 * GC'd
 */
import java.io.PrintStream;

class MemoryObject
{
    byte array[];
    MemoryObject next;
    MemoryObject previous;

    public MemoryObject(int size)
    {
        array = new byte[size];
    }
}

class thread00103
{
    static final int ARRAY_SIZE = 100;
    static final int OBJECT_SIZE = 10;
    static final int LOOP_COUNT = 5;
    static final int CIRCULARITY_SIZE = 3;

    static MemoryObject memoryArray[] = new MemoryObject[ARRAY_SIZE];

public static void main(String argv[]) {
System.exit(run(argv, System.out) + 95/*STATUS_TEMP*/);
}

    public static int run(String argv[],PrintStream out)
    {
        for (int j = 0; j < LOOP_COUNT; j++)
        {
            System.out.println(j + ": " + Runtime.getRuntime().freeMemory());
            for (int i = 0; i < ARRAY_SIZE; i ++)
            {
                memoryArray[i] = new MemoryObject(OBJECT_SIZE);
                makeCircular(memoryArray[i], CIRCULARITY_SIZE);
            }
        }

        // if there's any memory left, let's assume it's okay
        System.out.println("Test passed.");
return 0;

    }

    public static void makeCircular(MemoryObject mObj, int depth)
    {
MemoryObject tmpObj = mObj;

        for (int i = 0; i < depth; i++)
        {
            tmpObj.next = new MemoryObject(OBJECT_SIZE);
            tmpObj= tmpObj.next;
        }
tmpObj.next = mObj;
    }

    public static void confirmCircular(MemoryObject mObj)
    {
int count = 0;
MemoryObject mObj2 = mObj;
while (mObj2.next != mObj)
{
count++;
mObj2 = mObj2.next;
}
System.out.println("Circularity level: " + count);
    }
}
//---------------------

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