| /* |
| * Copyright (c) 2006, 2018, 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 nsk.share.jpda; |
| |
| import nsk.share.TestBug; |
| import nsk.share.locks.MonitorLockingThread; |
| |
| /* |
| * StateTestThread sequentially switches its state in following order: |
| * - thread not started |
| * - thread is running |
| * - thread is sleeping |
| * - thread in Object.wait() |
| * - thread wait on java monitor |
| * - thread is finished |
| * |
| * To use this class create new instance of StateTestThread and sequentially call method nextState(). |
| */ |
| public class StateTestThread extends Thread { |
| // thread states available through ThreadReference.state() |
| public static String stateTestThreadStates[] = { "UNKNOWN", "RUNNING", "SLEEPING", "WAIT", "MONITOR", "ZOMBIE" }; |
| |
| private Object waitOnObject = new Object(); |
| |
| public StateTestThread(String name) { |
| super(name); |
| } |
| |
| private volatile boolean isRunning; |
| |
| private volatile boolean waitState; |
| |
| public int getCurrentState() { |
| return currentState; |
| } |
| |
| private MonitorLockingThread auxiliaryThread = new MonitorLockingThread(this); |
| |
| private boolean isExecutedWithErrors; |
| |
| private volatile boolean readyToBeBlocked; |
| |
| private String errorMessage; |
| |
| public void run() { |
| isRunning = true; |
| |
| // running state |
| while (isRunning) |
| ; |
| |
| try { |
| // sleeping state |
| sleep(Long.MAX_VALUE); |
| } catch (InterruptedException e) { |
| // expected exception |
| } |
| |
| synchronized (waitOnObject) { |
| try { |
| // wait state |
| while (waitState) |
| waitOnObject.wait(); |
| } catch (InterruptedException e) { |
| isExecutedWithErrors = true; |
| errorMessage = "StateTestThread was unexpected interrupted during waiting"; |
| } |
| } |
| |
| // start auxiliary thread which should acquire 'this' lock |
| auxiliaryThread.acquireLock(); |
| |
| readyToBeBlocked = true; |
| |
| // try acquire the same lock as auxiliaryThread, switch state to 'wait on monitor' |
| synchronized (this) { |
| |
| } |
| } |
| |
| private int currentState = 1; |
| |
| public void nextState() { |
| // check is thread states change as expected |
| if (isExecutedWithErrors) |
| throw new TestBug(errorMessage); |
| |
| switch (currentState++) { |
| case 1: |
| // start thread |
| start(); |
| |
| while (!isRunning) |
| yield(); |
| |
| break; |
| case 2: |
| // stop running |
| isRunning = false; |
| |
| while (this.getState() != Thread.State.TIMED_WAITING) |
| yield(); |
| |
| break; |
| case 3: |
| waitState = true; |
| |
| // stop sleeping |
| interrupt(); |
| |
| while (getState() != Thread.State.WAITING) |
| yield(); |
| |
| break; |
| case 4: |
| waitState = false; |
| |
| // stop wait |
| synchronized (waitOnObject) { |
| waitOnObject.notify(); |
| } |
| |
| while (!readyToBeBlocked || (getState() != Thread.State.BLOCKED)) |
| yield(); |
| |
| break; |
| case 5: |
| // let StateTestThread thread acquire lock |
| auxiliaryThread.releaseLock(); |
| try { |
| join(); |
| } catch (InterruptedException e) { |
| throw new TestBug("Unexpected exception: " + e); |
| } |
| break; |
| |
| default: |
| throw new TestBug("Invalid thread state"); |
| } |
| } |
| } |