1 /* 2 * Copyright (c) 2006, 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 package nsk.share.jpda; 24 25 import nsk.share.TestBug; 26 import nsk.share.locks.MonitorLockingThread; 27 28 /* 29 * StateTestThread sequentially switches its state in following order: 30 * - thread not started 31 * - thread is running 32 * - thread is sleeping 33 * - thread in Object.wait() 34 * - thread wait on java monitor 35 * - thread is finished 36 * 37 * To use this class create new instance of StateTestThread and sequentially call method nextState(). 38 */ 39 public class StateTestThread extends Thread { 40 // thread states available through ThreadReference.state() 41 public static String stateTestThreadStates[] = { "UNKNOWN", "RUNNING", "SLEEPING", "WAIT", "MONITOR", "ZOMBIE" }; 42 43 private Object waitOnObject = new Object(); 44 45 public StateTestThread(String name) { 46 super(name); 47 } 48 49 private volatile boolean isRunning; 50 51 private volatile boolean waitState; 52 53 public int getCurrentState() { 54 return currentState; 55 } 56 57 private MonitorLockingThread auxiliaryThread = new MonitorLockingThread(this); 58 59 private boolean isExecutedWithErrors; 60 61 private volatile boolean readyToBeBlocked; 62 63 private String errorMessage; 64 65 public void run() { 66 isRunning = true; 67 68 // running state 69 while (isRunning) 70 ; 71 72 try { 73 // sleeping state 74 sleep(Long.MAX_VALUE); 75 } catch (InterruptedException e) { 76 // expected exception 77 } 78 79 synchronized (waitOnObject) { 80 try { 81 // wait state 82 while (waitState) 83 waitOnObject.wait(); 84 } catch (InterruptedException e) { 85 isExecutedWithErrors = true; 86 errorMessage = "StateTestThread was unexpected interrupted during waiting"; 87 } 88 } 89 90 // start auxiliary thread which should acquire 'this' lock 91 auxiliaryThread.acquireLock(); 92 93 readyToBeBlocked = true; 94 95 // try acquire the same lock as auxiliaryThread, switch state to 'wait on monitor' 96 synchronized (this) { 97 98 } 99 } 100 101 private int currentState = 1; 102 103 public void nextState() { 104 // check is thread states change as expected 105 if (isExecutedWithErrors) 106 throw new TestBug(errorMessage); 107 108 switch (currentState++) { 109 case 1: 110 // start thread 111 start(); 112 113 while (!isRunning) 114 yield(); 115 116 break; 117 case 2: 118 // stop running 119 isRunning = false; 120 121 while (this.getState() != Thread.State.TIMED_WAITING) 122 yield(); 123 124 break; 125 case 3: 126 waitState = true; 127 128 // stop sleeping 129 interrupt(); 130 131 while (getState() != Thread.State.WAITING) 132 yield(); 133 134 break; 135 case 4: 136 waitState = false; 137 138 // stop wait 139 synchronized (waitOnObject) { 140 waitOnObject.notify(); 141 } 142 143 while (!readyToBeBlocked || (getState() != Thread.State.BLOCKED)) 144 yield(); 145 146 break; 147 case 5: 148 // let StateTestThread thread acquire lock 149 auxiliaryThread.releaseLock(); 150 try { 151 join(); 152 } catch (InterruptedException e) { 153 throw new TestBug("Unexpected exception: " + e); 154 } 155 break; 156 157 default: 158 throw new TestBug("Invalid thread state"); 159 } 160 } 161 }