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/*
* 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)
Thread.yield();
break;
case 2:
// stop running
isRunning = false;
while (this.getState() != Thread.State.TIMED_WAITING)
Thread.yield();
break;
case 3:
waitState = true;
// stop sleeping
interrupt();
while (getState() != Thread.State.WAITING)
Thread.yield();
break;
case 4:
waitState = false;
// stop wait
synchronized (waitOnObject) {
waitOnObject.notify();
}
while (!readyToBeBlocked || (getState() != Thread.State.BLOCKED))
Thread.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");
}
}
}
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