/* * Copyright (c) 2010, 2022, 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. */ package gc.lock; import jdk.test.whitebox.WhiteBox; import nsk.share.runner.*; import nsk.share.gc.*; import nsk.share.gc.gp.GarbageUtils; import nsk.share.gc.lock.*; import nsk.share.test.ExecutionController; /** * Test how GC is affected by locking. * * A number of threads is started. Each one locks and eats memory. */ public class LockerTest extends ThreadedGCTest implements LockersAware { private Lockers lockers; private long objectSize = 1000; private class Worker implements Runnable { byte[] rezerve = new byte[1024]; private Locker locker = lockers.createLocker(rezerve); public Worker() { locker.enable(); } public void run() { ExecutionController stresser = getExecutionController(); // Use only 30% of the heap. final long testMemorySize = 3 * Runtime.getRuntime().maxMemory() / 10; while (stresser.continueExecution()) { locker.lock(); GarbageUtils.engageGC(testMemorySize); locker.unlock(); } } } protected Runnable createRunnable(int i) { return new Worker(); } public void setLockers(Lockers lockers) { this.lockers = lockers; } public static void main(String[] args) { RunParams.getInstance().setRunMemDiagThread(false); GC.runTest(new LockerTest(), args); } }