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/*
* Copyright 1998-2008 Sun Microsystems, Inc. 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. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun in the LICENSE file that accompanied this code.
*
* 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
*/
package javax.media.j3d;
class InputDeviceBlockingThread extends Thread {
// action flag for runMonitor
private static final int WAIT = 0;
private static final int NOTIFY = 1;
private static final int STOP = 2;
// blocking device that this thread manages
private InputDevice device;
private volatile boolean running = true;
private volatile boolean stop = false;
private boolean waiting = false;
private boolean ready = false;
private static int numInstances = 0;
private int instanceNum = -1;
InputDeviceBlockingThread(ThreadGroup threadGroup, InputDevice device) {
super(threadGroup, "");
setName("J3D-InputDeviceBlockingThread-" + getInstanceNum());
this.device = device;
}
private synchronized int newInstanceNum() {
return (++numInstances);
}
private int getInstanceNum() {
if (instanceNum == -1)
instanceNum = newInstanceNum();
return instanceNum;
}
@Override
public void run() {
// Since this thread is blocking, this thread should not be
// taking an inordinate amount of CPU time. Note that the
// yield() call should not be necessary (and may be ineffective),
// but we can't call MasterControl.threadYield() because it will
// sleep for at least a millisecond.
while (running) {
while (!stop) {
device.pollAndProcessInput();
Thread.yield();
}
runMonitor(WAIT);
}
}
void sleep() {
stop = true;
}
void restart() {
stop = false;
runMonitor(NOTIFY);
}
void finish() {
stop = true;
runMonitor(STOP);
}
synchronized void runMonitor(int action) {
switch (action) {
case WAIT:
// Issue 279 - loop until ready
while (running && !ready) {
waiting = true;
try {
wait();
} catch (InterruptedException e) {}
waiting = false;
}
ready = false;
break;
case NOTIFY:
ready = true;
if (waiting) {
notify();
}
break;
case STOP:
running = false;
if (waiting) {
notify();
}
break;
}
}
}
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