NEWT Display: Issue EDTUtil.start() at runOnEDTIfAvail(..) even if on EDT, which is to be stopped.

This case appears on e.g. OSX/CALayer (offscreen) reparenting using recreation (onscreen <-> offscreen),
i.e. display destroy/create is performed on EDT.

Misc Cleanup:

- Rename EDTUtil: restart() -> start()

- Rename Display: validateEDT() -> validateEDTStopped()

- Simplify Display.setEDTUtil(..): Remove need for redundant 'newEDTUtil' local var.

- Simplify Display.runOnEDTIfAvail(..): edtUtil is never null

7 files changed, 39 insertions, 39 deletions

diff --git a/src/newt/classes/com/jogamp/newt/Display.java b/src/newt/classes/com/jogamp/newt/Display.java
index c618405c2..382a5d583 100644
--- a/src/newt/classes/com/jogamp/newt/Display.java
+++ b/src/newt/classes/com/jogamp/newt/Display.java
@@ -78,7 +78,7 @@ public abstract class Display {
      * Stop the running EDT in case this display is destroyed already.<br>
      * @return true if EDT has been stopped (destroyed but running), otherwise false.
      */
-    public abstract boolean validateEDT();
+    public abstract boolean validateEDTStopped();
 
     /**
      * @return true if the native display handle is valid and ready to operate,
diff --git a/src/newt/classes/com/jogamp/newt/swt/NewtCanvasSWT.java b/src/newt/classes/com/jogamp/newt/swt/NewtCanvasSWT.java
index 47dfca0f3..2fa83e0e2 100644
--- a/src/newt/classes/com/jogamp/newt/swt/NewtCanvasSWT.java
+++ b/src/newt/classes/com/jogamp/newt/swt/NewtCanvasSWT.java
@@ -346,7 +346,7 @@ public class NewtCanvasSWT extends Canvas implements WindowClosingProtocol {
             {
                 final Display newtDisplay = newtChild.getScreen().getDisplay();
                 final EDTUtil edtUtil = new SWTEDTUtil(newtDisplay, getDisplay());
-                edtUtil.restart();
+                edtUtil.start();
                 newtDisplay.setEDTUtil( edtUtil );
             }
             
diff --git a/src/newt/classes/com/jogamp/newt/util/EDTUtil.java b/src/newt/classes/com/jogamp/newt/util/EDTUtil.java
index e86df2084..52ca95682 100644
--- a/src/newt/classes/com/jogamp/newt/util/EDTUtil.java
+++ b/src/newt/classes/com/jogamp/newt/util/EDTUtil.java
@@ -65,10 +65,10 @@ public interface EDTUtil {
     public void setPollPeriod(long ms);
     
     /**
-     * Starts or restarts the EDT.
+     * Starts the EDT after it's creation or after {@link #invokeStop(boolean, Runnable) stopping}.
      * <p>
-     * If the EDT is running, it must be stopped first via {@link #invokeStop(boolean, Runnable)}
-     * and the caller should wait until it's stopped via {@link #waitUntilStopped()}.
+     * If the EDT is running, it must be {@link #invokeStop(boolean, Runnable) stopped} first
+     * and the caller should wait {@link #waitUntilStopped() until it's stopped}.
      * </p>
      * 
      * @return true if EDT has been successfully restarted, otherwise false
@@ -77,7 +77,7 @@ public interface EDTUtil {
      * @see #invokeStop(boolean, java.lang.Runnable)
      * @see #waitUntilStopped()
      */
-    public boolean restart() throws IllegalStateException;
+    public boolean start() throws IllegalStateException;
 
     /**
      * Returns true if the current thread is the event dispatch thread (EDT).
@@ -130,7 +130,7 @@ public interface EDTUtil {
      *   <li>All previous queued tasks will be finished.</li>
      *   <li>No new tasks are allowed, an Exception is thrown.</li>
      *   <li>Can be issued from within EDT, ie from within an enqueued task.</li>
-     *   <li>{@link #restart()} may follow immediately, ie creating a new EDT</li>
+     *   <li>{@link #start()} may follow immediately, ie creating a new EDT</li>
      * </ul>
      * </p>
      * @return true if <code>task</code> has been executed or queued for later execution, otherwise false 
diff --git a/src/newt/classes/jogamp/newt/DefaultEDTUtil.java b/src/newt/classes/jogamp/newt/DefaultEDTUtil.java
index 5794d4ae9..3d1037ad5 100644
--- a/src/newt/classes/jogamp/newt/DefaultEDTUtil.java
+++ b/src/newt/classes/jogamp/newt/DefaultEDTUtil.java
@@ -77,7 +77,7 @@ public class DefaultEDTUtil implements EDTUtil {
     }
     
     @Override
-    public final boolean restart() throws IllegalStateException {
+    public final boolean start() throws IllegalStateException {
         synchronized(edtLock) {
             if( edt.isRunning() ) {
                 throw new IllegalStateException("EDT still running and not subject to stop. Curr "+Thread.currentThread().getName()+", EDT "+edt.getName()+", isRunning "+edt.isRunning+", shouldStop "+edt.shouldStop);
@@ -135,6 +135,10 @@ public class DefaultEDTUtil implements EDTUtil {
 
     @Override
     public final boolean invokeStop(boolean wait, Runnable task) {
+        if(DEBUG) {
+            System.err.println(Thread.currentThread()+": Default-EDT.invokeStop wait "+wait);
+            Thread.dumpStack();
+        }
         return invokeImpl(wait, task, true);
     }
 
diff --git a/src/newt/classes/jogamp/newt/DisplayImpl.java b/src/newt/classes/jogamp/newt/DisplayImpl.java
index 8f792b23c..0f47c87a0 100644
--- a/src/newt/classes/jogamp/newt/DisplayImpl.java
+++ b/src/newt/classes/jogamp/newt/DisplayImpl.java
@@ -170,7 +170,7 @@ public abstract class DisplayImpl extends Display {
         if(NewtFactory.useEDT()) {
             def = new DefaultEDTUtil(Thread.currentThread().getThreadGroup(), "Display-"+getFQName(), dispatchMessagesRunnable);            
             if(DEBUG) {
-                System.err.println("Display.createNative("+getFQName()+") Create EDTUtil: "+def.getClass().getName());
+                System.err.println("Display.createEDTUtil("+getFQName()+"): "+def.getClass().getName());
             }
         } else {
             def = null;
@@ -181,21 +181,18 @@ public abstract class DisplayImpl extends Display {
     @Override
     public synchronized EDTUtil setEDTUtil(final EDTUtil usrEDTUtil) {
         final EDTUtil oldEDTUtil = edtUtil;
-        final EDTUtil newEDTUtil;
         if( null != usrEDTUtil && usrEDTUtil == oldEDTUtil ) {
             if( DEBUG ) {
                 System.err.println("Display.setEDTUtil: "+usrEDTUtil+" - keep!");
             }
-            newEDTUtil = oldEDTUtil;
-        } else {
-            if(DEBUG) {
-                final String msg = ( null == usrEDTUtil ) ? "default" : "custom";
-                System.err.println("Display.setEDTUtil("+msg+"): "+oldEDTUtil+" -> "+usrEDTUtil);
-            }
-            stopEDT( oldEDTUtil, null );
-            newEDTUtil = ( null == usrEDTUtil ) ? createEDTUtil() : usrEDTUtil;
+            return oldEDTUtil;
+        }
+        if(DEBUG) {
+            final String msg = ( null == usrEDTUtil ) ? "default" : "custom";
+            System.err.println("Display.setEDTUtil("+msg+"): "+oldEDTUtil+" -> "+usrEDTUtil);
         }
-        edtUtil = newEDTUtil;
+        stopEDT( oldEDTUtil, null );
+        edtUtil = ( null == usrEDTUtil ) ? createEDTUtil() : usrEDTUtil;
         return oldEDTUtil;
     }
 
@@ -224,31 +221,30 @@ public abstract class DisplayImpl extends Display {
 
     public void runOnEDTIfAvail(boolean wait, final Runnable task) {
         final EDTUtil _edtUtil = edtUtil;
-        if( null != _edtUtil && !_edtUtil.isCurrentThreadEDT() ) {
-            if( !_edtUtil.isRunning() ) { // start EDT if not running yet
-                synchronized( this ) {
-                    if( !_edtUtil.isRunning() ) { // // volatile dbl-checked-locking OK
-                        _edtUtil.restart();
-                        if( DEBUG ) {
-                            System.err.println("Info: EDT started "+Thread.currentThread().getName()+", "+this);
-                            Thread.dumpStack();
-                        }
+        if( !_edtUtil.isRunning() ) { // start EDT if not running yet
+            synchronized( this ) {
+                if( !_edtUtil.isRunning() ) { // // volatile dbl-checked-locking OK
+                    if( DEBUG ) {
+                        System.err.println("Info: EDT start "+Thread.currentThread().getName()+", "+this);
+                        Thread.dumpStack();
                     }
+                    _edtUtil.start();
                 }
             }
-            if( !_edtUtil.invoke(wait, task) ) {
-                if( DEBUG ) {
-                    System.err.println("Warning: invoke(wait "+wait+", ..) on EDT failed .. invoke on current thread "+Thread.currentThread().getName());
-                    Thread.dumpStack();
-                }
-                task.run();
+        }
+        if( !_edtUtil.isCurrentThreadEDT() ) {
+            if( _edtUtil.invoke(wait, task) ) {
+                return; // done
+            }
+            if( DEBUG ) {
+                System.err.println("Warning: invoke(wait "+wait+", ..) on EDT failed .. invoke on current thread "+Thread.currentThread().getName());
+                Thread.dumpStack();
             }
-        } else {
-            task.run();
         }
+        task.run();
     }
 
-    public boolean validateEDT() {
+    public boolean validateEDTStopped() {
         if( 0==refCount && null == aDevice ) {
             final EDTUtil _edtUtil = edtUtil;
             if( null != _edtUtil && _edtUtil.isRunning() ) {
diff --git a/src/newt/classes/jogamp/newt/driver/awt/AWTEDTUtil.java b/src/newt/classes/jogamp/newt/driver/awt/AWTEDTUtil.java
index 80c72c008..02f4be0cd 100644
--- a/src/newt/classes/jogamp/newt/driver/awt/AWTEDTUtil.java
+++ b/src/newt/classes/jogamp/newt/driver/awt/AWTEDTUtil.java
@@ -68,7 +68,7 @@ public class AWTEDTUtil implements EDTUtil {
     }
     
     @Override
-    public final boolean restart() throws IllegalStateException {
+    public final boolean start() throws IllegalStateException {
         synchronized(edtLock) {
             if( nedt.isRunning() ) {
                 throw new IllegalStateException("EDT still running and not subject to stop. Curr "+Thread.currentThread().getName()+", NEDT "+nedt.getName()+", isRunning "+nedt.isRunning+", shouldStop "+nedt.shouldStop+", on AWT-EDT "+EventQueue.isDispatchThread());
diff --git a/src/newt/classes/jogamp/newt/swt/SWTEDTUtil.java b/src/newt/classes/jogamp/newt/swt/SWTEDTUtil.java
index d46562050..6024195e3 100644
--- a/src/newt/classes/jogamp/newt/swt/SWTEDTUtil.java
+++ b/src/newt/classes/jogamp/newt/swt/SWTEDTUtil.java
@@ -77,7 +77,7 @@ public class SWTEDTUtil implements EDTUtil {
     }
 
     @Override
-    public final boolean restart() throws IllegalStateException {
+    public final boolean start() throws IllegalStateException {
         final boolean swtDisposed = swtDisplay.isDisposed();
         synchronized(edtLock) {
             if( nedt.isRunning() ) {