Bug 1181 - JOGL WebStart Applications using GLCanvas/AWT may Deadlock by two AWT-EDT on Java >= 1.8.0_45

Root cause:

- AWT Toolkit global Lock

Our locking scheme (AWT-EDT-1):
- Surface Lock
- sun.awt.SunToolkit.awtLock()
- Component.getGraphicsConfiguration() -> synchronized(Component.getTreeLock())

Other AWT-EDT-2 by Webstart:
- synchronized(Component.getTreeLock())
- sun.awt.SunToolkit.awtLock()

Results in a deadlock.

Solution:
 - Issue Component.getGraphicsConfiguration() before awtLock(),
   where Component.getGraphicsConfiguration() is being used to
   detect possible reconfiguration.

 - Also use updated AWTGraphicsConfiguration's GraphicsConfiguration
   if no 'new' detection is required.

1 files changed, 4 insertions, 3 deletions

diff --git a/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java b/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java
index 0a27f7f22..ae32fd164 100644
--- a/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java
+++ b/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java
@@ -626,8 +626,8 @@ public class NewtCanvasAWT extends java.awt.Canvas implements WindowClosingProto
             }
         }
     }
-    private final boolean updatePixelScale() {
-        if( jawtWindow.updatePixelScale(true) ) {
+    private final boolean updatePixelScale(final GraphicsConfiguration gc) {
+        if( jawtWindow.updatePixelScale(gc, true) ) {
             final Window cWin = newtChild;
             final Window dWin = cWin.getDelegatedWindow();
             if( dWin instanceof WindowImpl ) {
@@ -718,6 +718,7 @@ public class NewtCanvasAWT extends java.awt.Canvas implements WindowClosingProto
                 } else {
                     NewtFactoryAWT.destroyNativeWindow(jawtWindow);
                     jawtWindow=null;
+                    awtConfig=null;
                     destroyJAWTPending = false;
                 }
             }
@@ -747,7 +748,7 @@ public class NewtCanvasAWT extends java.awt.Canvas implements WindowClosingProto
                     System.err.println("NewtCanvasAWT.reshape: "+x+"/"+y+" "+width+"x"+height);
                 }
                 if( validateComponent(true) ) {
-                    if( !printActive && updatePixelScale() ) {
+                    if( !printActive && updatePixelScale(getGraphicsConfiguration()) ) {
                         // NOP
                     } else {
                         // newtChild.setSize(width, height);