1 /* 2 * Copyright (c) 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 package nsk.stress.jni; 25 26 class GarbageGenerator extends Thread { 27 class Garbage { 28 Garbage() { 29 this(1024); 30 } 31 32 Garbage(int m) { 33 memory = new byte[m]; 34 } 35 36 void setNext(Garbage n) { 37 next = n; 38 } 39 40 Garbage getNext() { 41 return next; 42 } 43 44 protected void finalize() { 45 } 46 47 private Garbage next; 48 private byte[] memory; 49 } 50 51 class GarbageRing { 52 GarbageRing() { 53 attachment = new Garbage(0); 54 } 55 56 void add(int size) { 57 Garbage head = attachment.getNext(); 58 Garbage g = new Garbage(size); 59 if (head != null) { 60 Garbage oldNext = head.getNext(); 61 if (oldNext != null) { 62 g.setNext(oldNext); 63 head.setNext(g); 64 attachment.setNext(g); 65 } else { 66 g.setNext(head); 67 head.setNext(g); 68 } 69 } else 70 attachment.setNext(g); 71 } 72 73 void discard() { 74 attachment.setNext(null); 75 } 76 77 private byte[] memory; 78 private Garbage attachment; 79 } 80 81 public void run() { 82 GarbageRing gr = new GarbageRing(); 83 int g = 0; 84 while (!done) { 85 for (g = 0; g < ringSize; g++) { 86 gr.add(allocSize); 87 yield(); 88 } 89 gr.discard(); 90 try { 91 sleep(interval); 92 } catch (InterruptedException e) { 93 } 94 } 95 if (DEBUG) System.out.println("GarbageRing::run(): done"); 96 } 97 98 public void setAllocSize(int i) { 99 allocSize = i; 100 } 101 102 public int getAllocSize() { 103 return allocSize; 104 } 105 106 public void setInterval(int i) { 107 interval = i; 108 } 109 110 public int getInterval() { 111 return interval; 112 } 113 114 public void halt() { 115 done = true; 116 } 117 118 private int allocSize = 10000; 119 private int ringSize = 50; 120 private int interval = 1000; 121 private boolean done = false; 122 final private static boolean DEBUG = false; 123 }