Gets Harvey's changes

1 files changed, 120 insertions, 0 deletions

diff --git a/src/javax/media/j3d/InputDeviceBlockingThread.java b/src/javax/media/j3d/InputDeviceBlockingThread.java
new file mode 100644
index 0000000..f65a65b
--- /dev/null
+++ b/src/javax/media/j3d/InputDeviceBlockingThread.java
@@ -0,0 +1,120 @@
+/*
+ * 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;
+	}
+    }
+}