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git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/svn-server-sync/jogl/branches/JOGL_2_SANDBOX@1872 232f8b59-042b-4e1e-8c03-345bb8c30851

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diff --git a/src/jogl/classes/com/sun/opengl/impl/GLWorkerThread.java b/src/jogl/classes/com/sun/opengl/impl/GLWorkerThread.java
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+/*
+ * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ * - Redistribution of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 
+ * - Redistribution in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * 
+ * Neither the name of Sun Microsystems, Inc. or the names of
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * This software is provided "AS IS," without a warranty of any kind. ALL
+ * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
+ * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
+ * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
+ * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
+ * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
+ * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
+ * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ * 
+ * You acknowledge that this software is not designed or intended for use
+ * in the design, construction, operation or maintenance of any nuclear
+ * facility.
+ * 
+ * Sun gratefully acknowledges that this software was originally authored
+ * and developed by Kenneth Bradley Russell and Christopher John Kline.
+ */
+
+package com.sun.opengl.impl;
+
+import java.lang.reflect.InvocationTargetException;
+import java.security.*;
+import java.util.*;
+import javax.media.opengl.*;
+
+/** Singleton thread upon which all OpenGL work is performed by
+    default. Unfortunately many vendors' OpenGL drivers are not really
+    thread-safe and stability is much improved by performing OpenGL
+    work on at most one thread. This is the default behavior of the
+    GLAutoDrawable implementations according to the {@link
+    javax.media.opengl.Threading Threading} class. The GLWorkerThread
+    replaces the original AWT event queue thread-based mechanism for
+    two reasons: first, more than one AWT event queue thread may be
+    spawned, for example if a dialog is being shown; second, it avoids
+    blocking the AWT event queue thread during OpenGL rendering. */
+
+public class GLWorkerThread {
+  private static volatile boolean started;
+  private static volatile Thread thread;
+  private static Object lock;
+  private static volatile boolean shouldTerminate;
+  private static volatile Throwable exception;
+
+  // The Runnable to execute immediately on the worker thread
+  private static volatile Runnable work;
+  // Queue of Runnables to be asynchronously invoked
+  private static List queue = new LinkedList();
+  
+  /** Should only be called by Threading class if creation of the
+      GLWorkerThread was requested via the opengl.1thread system
+      property. */
+  public static void start() {
+    if (!started) {
+      synchronized (GLWorkerThread.class) {
+        if (!started) {
+          lock = new Object();
+          thread = new Thread(new WorkerRunnable(),
+                              "JOGL GLWorkerThread");
+          thread.setDaemon(true);
+          started = true;
+          synchronized (lock) {
+            thread.start();
+            try {
+              lock.wait();
+            } catch (InterruptedException e) {
+            }
+          }
+
+          /*
+
+          // Note: it appears that there is a bug in NVidia's current
+          // drivers where if a context was ever made current on a
+          // given thread and that thread has exited before program
+          // exit, a crash occurs in the drivers. Releasing the
+          // context from the given thread does not work around the
+          // problem.
+          //
+          // For the time being, we're going to work around this
+          // problem by not terminating the GLWorkerThread. In theory,
+          // shutting down the GLWorkerThread cleanly could be a good
+          // general solution to the problem of needing to
+          // cooperatively terminate all Animators at program exit.
+          //
+          // It appears that this doesn't even work around all of the
+          // kinds of crashes. Causing the context to be unilaterally
+          // released from the GLWorkerThread after each invocation
+          // seems to work around all of the kinds of crashes seen.
+          //
+          // These appear to be similar to the kinds of crashes seen
+          // when the Java2D/OpenGL pipeline terminates, and those are
+          // a known issue being fixed, so presumably these will be
+          // fixed in NVidia's next driver set.
+
+          // Install shutdown hook to terminate daemon thread more or
+          // less cooperatively
+          AccessController.doPrivileged(new PrivilegedAction() {
+              public Object run() {
+                Runtime.getRuntime().addShutdownHook(new Thread() {
+                    public void run() {
+                      Object lockTemp = lock;
+                      if (lockTemp == null) {
+                        // Already terminating (?)
+                        return;
+                      }
+                      synchronized (lockTemp) {
+                        shouldTerminate = true;
+                        lockTemp.notifyAll();
+                        try {
+                          lockTemp.wait(500);
+                        } catch (InterruptedException e) {
+                        }
+                      }
+                    }
+                  });
+                return null;
+              }
+            });
+
+          */
+
+        } else {
+          throw new RuntimeException("Should not start GLWorkerThread twice");
+        }
+      }
+    }
+  }
+
+  public static void invokeAndWait(Runnable runnable)
+    throws InvocationTargetException, InterruptedException {
+    if (!started) {
+      throw new RuntimeException("May not invokeAndWait on worker thread without starting it first");
+    }
+
+    Object lockTemp = lock;
+    if (lockTemp == null) {
+      return; // Terminating
+    }
+
+    synchronized (lockTemp) {
+      if (thread == null) {
+        // Terminating
+        return;
+      }
+
+      work = runnable;
+      lockTemp.notifyAll();
+      lockTemp.wait();
+      if (exception != null) {
+        Throwable localException = exception;
+        exception = null;
+        throw new InvocationTargetException(localException);
+      }
+    }
+  }
+
+  public static void invokeLater(Runnable runnable) {
+    if (!started) {
+      throw new RuntimeException("May not invokeLater on worker thread without starting it first");
+    }
+
+    Object lockTemp = lock;
+    if (lockTemp == null) {
+      return; // Terminating
+    }
+
+    synchronized (lockTemp) {
+      if (thread == null) {
+        // Terminating
+        return;
+      }
+
+      queue.add(runnable);
+      lockTemp.notifyAll();
+    }
+  }
+
+  /** Indicates whether the OpenGL worker thread was started, i.e.,
+      whether it is currently in use. */
+  public static boolean isStarted() {
+    return started;
+  }
+
+  /** Indicates whether the current thread is the OpenGL worker
+      thread. */
+  public static boolean isWorkerThread() {
+    return (Thread.currentThread() == thread);
+  }
+
+  static class WorkerRunnable implements Runnable {
+    public void run() {
+      // Notify starting thread that we're ready
+      synchronized (lock) {
+        lock.notifyAll();
+      }
+
+      while (!shouldTerminate) {
+        synchronized (lock) {
+          while (!shouldTerminate &&
+                 (work == null) &&
+                 queue.isEmpty()) {
+            try {
+              // Avoid race conditions with wanting to release contexts on this thread
+              lock.wait(1000);
+            } catch (InterruptedException e) {
+            }
+
+            if (GLContext.getCurrent() != null) {
+              // Test later to see whether we need to release this context
+              break;
+            }
+          }
+          
+          if (shouldTerminate) {
+            lock.notifyAll();
+            thread = null;
+            lock = null;
+            return;
+          }
+
+          if (work != null) {
+            try {
+              work.run();
+            } catch (Throwable t) {
+              exception = t;
+            } finally {
+              work = null;
+              lock.notifyAll();
+            }
+          }
+
+          while (!queue.isEmpty()) {
+            try {
+              Runnable curAsync = (Runnable) queue.remove(0);
+              curAsync.run();
+            } catch (Throwable t) {
+              System.out.println("Exception occurred on JOGL OpenGL worker thread:");
+              t.printStackTrace();
+            }
+          }
+
+          // See about releasing current context
+          GLContext curContext = GLContext.getCurrent();
+          if (curContext != null &&
+              (curContext instanceof GLContextImpl)) {
+            GLContextImpl impl = (GLContextImpl) curContext;
+            if (impl.hasWaiters()) {
+              impl.release();
+            }
+          }
+        }
+      }
+    }
+  }
+}