162 lines
4.5 KiB
Java
162 lines
4.5 KiB
Java
/*
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* Copyright (c) 2006, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package nsk.share.jpda;
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import nsk.share.TestBug;
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import nsk.share.locks.MonitorLockingThread;
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/*
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* StateTestThread sequentially switches its state in following order:
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* - thread not started
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* - thread is running
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* - thread is sleeping
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* - thread in Object.wait()
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* - thread wait on java monitor
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* - thread is finished
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*
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* To use this class create new instance of StateTestThread and sequentially call method nextState().
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*/
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public class StateTestThread extends Thread {
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// thread states available through ThreadReference.state()
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public static String stateTestThreadStates[] = { "UNKNOWN", "RUNNING", "SLEEPING", "WAIT", "MONITOR", "ZOMBIE" };
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private Object waitOnObject = new Object();
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public StateTestThread(String name) {
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super(name);
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}
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private volatile boolean isRunning;
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private volatile boolean waitState;
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public int getCurrentState() {
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return currentState;
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}
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private MonitorLockingThread auxiliaryThread = new MonitorLockingThread(this);
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private boolean isExecutedWithErrors;
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private volatile boolean readyToBeBlocked;
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private String errorMessage;
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public void run() {
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isRunning = true;
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// running state
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while (isRunning)
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;
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try {
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// sleeping state
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sleep(Long.MAX_VALUE);
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} catch (InterruptedException e) {
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// expected exception
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}
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synchronized (waitOnObject) {
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try {
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// wait state
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while (waitState)
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waitOnObject.wait();
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} catch (InterruptedException e) {
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isExecutedWithErrors = true;
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errorMessage = "StateTestThread was unexpected interrupted during waiting";
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}
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}
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// start auxiliary thread which should acquire 'this' lock
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auxiliaryThread.acquireLock();
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readyToBeBlocked = true;
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// try acquire the same lock as auxiliaryThread, switch state to 'wait on monitor'
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synchronized (this) {
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}
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}
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private int currentState = 1;
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public void nextState() {
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// check is thread states change as expected
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if (isExecutedWithErrors)
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throw new TestBug(errorMessage);
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switch (currentState++) {
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case 1:
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// start thread
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start();
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while (!isRunning)
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Thread.yield();
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break;
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case 2:
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// stop running
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isRunning = false;
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while (this.getState() != Thread.State.TIMED_WAITING)
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Thread.yield();
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break;
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case 3:
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waitState = true;
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// stop sleeping
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interrupt();
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while (getState() != Thread.State.WAITING)
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Thread.yield();
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break;
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case 4:
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waitState = false;
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// stop wait
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synchronized (waitOnObject) {
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waitOnObject.notify();
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}
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while (!readyToBeBlocked || (getState() != Thread.State.BLOCKED))
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Thread.yield();
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break;
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case 5:
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// let StateTestThread thread acquire lock
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auxiliaryThread.releaseLock();
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try {
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join();
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} catch (InterruptedException e) {
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throw new TestBug("Unexpected exception: " + e);
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}
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break;
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default:
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throw new TestBug("Invalid thread state");
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}
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}
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}
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