1 /* 2 * Copyright (c) 2007, 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.monitoring.share.thread; 25 26 /** 27 * Locker thread is used to lock monitor on which BlockedThread's 28 * waits. 29 */ 30 public class LockerThread extends Thread { 31 private String lock = new String("a lock"); 32 private Object ready = new Object(); 33 private Object lockit = new Object(); 34 private volatile boolean locked = false; 35 getLock()36 public Object getLock() { 37 return lock; 38 } 39 isLocked()40 public boolean isLocked() { 41 return locked; 42 } 43 waitState()44 public void waitState() { 45 synchronized (ready) { 46 while (!locked) { 47 try { 48 ready.wait(); 49 } catch (InterruptedException e) { 50 } 51 } 52 } 53 54 ThreadUtils.waitThreadState(this, Thread.State.WAITING); 55 56 System.out.println("Locker thread reached WAITING state"); 57 } 58 finish()59 public void finish() { 60 locked = false; 61 synchronized (lockit) { 62 lockit.notifyAll(); 63 } 64 } 65 run()66 public void run() { 67 synchronized (lock) { 68 synchronized (lockit) { 69 synchronized (ready) { 70 locked = true; 71 ready.notifyAll(); 72 } 73 while (locked) { 74 try { 75 lockit.wait(); 76 } catch (InterruptedException e) { 77 } 78 } 79 } 80 } 81 82 System.out.println("Locker thread leaved WAITING state"); 83 } 84 } 85