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/*
* Copyright (c) 2002, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @key stress
*
* @summary converted from VM Testbase gc/gctests/MTLinkedListGC.
* VM Testbase keywords: [gc, stress, nonconcurrent]
* VM Testbase readme:
* In this test 1000 threads contribute in the formation
* of 1 Meg circular Linked list. Insertion into the linked list
* is sequential. Once formed, the linked list is converted to
* garbage and the process repeated 50 times. The test fails
* if an OutofMemoryException is thrown and passes otherwise.
*
* @library /vmTestbase
* /test/lib
* @run main/othervm gc.gctests.MTLinkedListGC.MTLinkedListGC
*/
package gc.gctests.MTLinkedListGC;
import java.util.Vector;
import nsk.share.TestFailure;
class CircularLinkedList {
synchronized void addElement(String info) {
node newnode;
int elementCount ; // Number of nodes in LinkedList
elementCount = elementCount();
// Do not allow the linked list to grow to more
// than 100000 nodes
if (elementCount >= MAXNODES)
return;
newnode = new node(info);
if (Root == null) {
Root = newnode;
Root.next = Root;
Root.prev = Root;
}
else {
newnode.next = Root.next;
Root.next.prev = newnode;
Root.next = newnode;
newnode.prev = Root;
}
}
private synchronized int elementCount() {
node p;
int count;
if (Root == null)
return 0;
p = Root;
count = 0;
do {
p = p.prev;
count++;
} while(p != Root);
return count;
}
private node Root;
private final int MAXNODES = 100000;
}
class LinkedListGrower extends Thread {
LinkedListGrower(int ThreadNumber) {
setName("Thread-" + ThreadNumber);
}
public void run() {
LinkedListHolder.getCircularLinkedList().addElement(getName());
}
}
class LinkedListHolder {
private static CircularLinkedList cl = new CircularLinkedList();
static CircularLinkedList getCircularLinkedList() { return cl; }
static void getNewList() { cl = new CircularLinkedList(); }
}
public class MTLinkedListGC {
public static void main(String args[]) {
int memory_reserve[] = new int [1000];
Thread ThreadsArray[] = new LinkedListGrower[1000];
int count;
// for(int i = 0; i < ThreadsArray.length; i++ )
// ThreadsArray[i] = new LinkedListGrower(i);
count = 0;
try {
while(count < 50 ){
for(int i = 0; i < ThreadsArray.length; i++ )
ThreadsArray[i] = new LinkedListGrower(i);
for(int i = 0 ; i < ThreadsArray.length ; i++)
ThreadsArray[i].start();
try {
for(int i =0 ; i < ThreadsArray.length ; i++)
ThreadsArray[i].join();
} catch(Exception e) { }
//turn the old linked list into garbage
LinkedListHolder.getNewList();
System.out.println("Finished iteration " + count);
count ++;
}
} catch (OutOfMemoryError e) {
memory_reserve = null;
System.gc();
throw new TestFailure("Test Failed at " + count +"th iteration.");
}
System.out.println("Test Passed");
}
}
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