1 /* 2 * Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 25 /* 26 * @test 27 * @key stress gc randomness 28 * 29 * @summary converted from VM Testbase gc/gctests/PhantomReference/phantom002. 30 * VM Testbase keywords: [gc, stress, stressopt, nonconcurrent] 31 * VM Testbase readme: 32 * DESCRIPTION 33 * The test checks that Garbage Collector correctly works with 34 * PhantomReferences. It also checks that no unexpected exceptions and errors 35 * are thrown or the JVM is not crashed. 36 * The test starts a number of threads. Each thread run tests for some time 37 * or serveral iterations. See javadoc StressOptions for configuration. 38 * First of all each thread defines what type to check (there are 11 types 39 * totally). As soon as the type is defined, a PhantomRefence is created that 40 * refers to an array of tested type and is registered with in a queue. A 41 * PhantomRefence for NonbranchyTree and Referent calsses does not refer to 42 * arrays, but to instances of the classes. 43 * After that a thread performs next checks for the reference: 44 * 1. The reference is in queue after GC is provoked with 45 * Algorithms.eatMemory() method (a single thread eats the memory). 46 * 2. reference.get() returns null. 47 * 3. queue.poll() returns the reference that was created. 48 * 4. queue.poll() again returns null. 49 * 5. If the checked type is class (Referent), then it must be finalized, 50 * since the reference is already enqueued. 51 * 6. reference.clear() does not throw any exception. 52 * The test extends ThreadedGCTest and implements GarbageProducerAware and 53 * MemoryStrategyAware interfaces. The corresponding javadoc documentation 54 * for additional test configuration. 55 * 56 * @library /vmTestbase 57 * /test/lib 58 * @run driver jdk.test.lib.FileInstaller . . 59 * @run main/othervm gc.gctests.PhantomReference.phantom001.phantom001 -ms high 60 */ 61