/* * Copyright (c) 2004, 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 gc randomness * * @summary converted from VM Testbase gc/gctests/PhantomReference/phantom001. * VM Testbase keywords: [gc, stress, stressopt, nonconcurrent] * VM Testbase readme: * DESCRIPTION * The test checks that Garbage Collector correctly works with * PhantomReferences. It also checks that no unexpected exceptions and errors * are thrown or the JVM is not crashed. * The test starts a number of threads. Each thread run tests for some time * or serveral iterations. See javadoc StressOptions for configuration. * First of all each thread defines what type to check (there are 11 types * totally). As soon as the type is defined, a PhantomRefence is created that * refers to an array of tested type and is registered with in a queue. A * PhantomRefence for NonbranchyTree and Referent calsses does not refer to * arrays, but to instances of the classes. * After that a thread performs next checks for the reference: * 1. The reference is in queue after GC is provoked with * Algorithms.eatMemory() method (a single thread eats the memory). * 2. reference.get() returns null. * 3. queue.poll() returns the reference that was created. * 4. queue.poll() again returns null. * 5. If the checked type is class (Referent), then it must be finalized, * since the reference is already enqueued. * 6. reference.clear() does not throw any exception. * The test extends ThreadedGCTest and implements GarbageProducerAware and * MemoryStrategyAware interfaces. The corresponding javadoc documentation * for additional test configuration. * * @library /vmTestbase * /test/lib * @run driver jdk.test.lib.FileInstaller . . * @run main/othervm gc.gctests.PhantomReference.phantom001.phantom001 -ms low */ package gc.gctests.PhantomReference.phantom001; import java.lang.ref.*; import nsk.share.gc.*; import nsk.share.gc.gp.*; import nsk.share.gc.gp.string.InternedStringProducer; import nsk.share.gc.gp.string.RandomStringProducer; public class phantom001 extends ThreadedGCTest implements GarbageProducerAware, MemoryStrategyAware { private GarbageProducer garbageProducer; private MemoryStrategy memoryStrategy; private InternedStringProducer internedStringProducer = new InternedStringProducer(new RandomStringProducer(10)); // Total number of types to test final static int TYPES_COUNT = 12; // Size of array of each tested type. The constant also specifies the // number of nodes in a NonbranchyTree and size of each node final static int SIZE = 100; protected Runnable createRunnable(int i) { return new Test(); } public void setGarbageProducer(GarbageProducer garbageProducer) { this.garbageProducer = garbageProducer; } public void setMemoryStrategy(MemoryStrategy memoryStrategy) { this.memoryStrategy = memoryStrategy; } public static void main(String[] args) { GC.runTest(new phantom001(), args); } // The class implements the logic of the testcase class Test implements Runnable { int iteration; private volatile boolean finalized; public void run() { try { log.info("iteration " + iteration); ReferenceQueue queue = new ReferenceQueue(); PhantomReference reference; int code = iteration % TYPES_COUNT; String type; // Define a specific type for each thread to test switch (code) { case 0: reference = new PhantomReference(new byte[SIZE], queue); type = "byte"; break; case 1: reference = new PhantomReference(new short[SIZE], queue); type = "short"; break; case 2: reference = new PhantomReference(new int[SIZE], queue); type = "int"; break; case 3: reference = new PhantomReference(new long[SIZE], queue); type = "long"; break; case 4: reference = new PhantomReference(new char[SIZE], queue); type = "char"; break; case 5: reference = new PhantomReference(new boolean[SIZE], queue); type = "boolean"; break; case 6: reference = new PhantomReference(new double[SIZE], queue); type = "double"; break; case 7: reference = new PhantomReference(new float[SIZE], queue); type = "float"; break; case 8: reference = new PhantomReference(new Object[SIZE], queue); type = "Object"; break; case 9: reference = new PhantomReference(new NonbranchyTree(SIZE, 0.3f, SIZE), queue); type = "NonbranchyTree"; break; case 10: reference = new PhantomReference(internedStringProducer.create(SIZE), queue); type = "InternedString"; break; default: reference = new PhantomReference(new Referent(), queue); type = "class"; } int initialFactor = memoryStrategy.equals(MemoryStrategy.HIGH) ? 1 : (memoryStrategy.equals(MemoryStrategy.LOW) ? 10 : 2); GarbageUtils.eatMemory(getExecutionController(), garbageProducer, initialFactor , 10, 0); if (type.equals("class")) { while (!finalized && getExecutionController().continueExecution()) { System.runFinalization(); //does not guarantee finalization, but increases the chance try { Thread.sleep(100); } catch (InterruptedException e) {} GarbageUtils.eatMemory(getExecutionController(), garbageProducer, initialFactor , 10, 0); } //provoke gc once more to make finalized object phantom reachable GarbageUtils.eatMemory(getExecutionController(), garbageProducer, initialFactor , 10, 0); } if (!getExecutionController().continueExecution()) { // we were interrrupted by stresser. just exit... return; } Reference polledReference = null; try { polledReference = queue.remove(); } catch (InterruptedException e) { log.error("Unexpected InterruptedException during queue.remove()."); setFailed(true); } // Check the reference and the queue // The polled reference must be equal to the one enqueued to // the queue if (polledReference != reference) { log.error("The original reference is not equal to polled reference."); setFailed(true); } // queue.poll() once again must return null now, since there is // only one reference in the queue polledReference = queue.poll(); if (polledReference != null) { log.error("There are more than one references in the queue."); setFailed(true); } reference.clear(); } catch (OutOfMemoryError e) { } iteration++; } class Referent { //We need discard this flag to make second and following checks with type.equals("class") useful public Referent() { finalized = false; } protected void finalize() { finalized = true; } } } }