NEWT Window Lifecycle / ScreenMode:

Lifecycle.reparentActionPre()/reparentActionPost() -> pauseRenderingAction()/resumeRenderingAction()
for a more generic use, ie reparenting and screen mode change.

ScreenMode change: No more visibility/fullscreen changes, no more locking,
                   just pause/resume animation.

X11 ScreenMode set: move from thread/wait to simple polling over time (timeout)

5 files changed, 123 insertions, 112 deletions

diff --git a/make/scripts/tests2.sh b/make/scripts/tests2.sh
index 19ecb123a..9f143e60a 100644
--- a/make/scripts/tests2.sh
+++ b/make/scripts/tests2.sh
@@ -27,10 +27,11 @@ function jrun() {
     #D_ARGS="-Dnewt.debug.EDT -Djogamp.common.utils.locks.Lock.timeout=600000 -Djogl.debug.Animator -Dnewt.debug.Display -Dnewt.debug.Screen"
     #D_ARGS="-Dnewt.debug.EDT -Dnewt.debug.Display -Dnativewindow.debug.X11Util -Djogl.debug.GLDrawable -Djogl.debug.GLCanvas"
     #D_ARGS="-Dnewt.debug.EDT -Djogl.debug.GLContext"
-    #D_ARGS="-Dnewt.debug.Screen -Dnewt.debug.EDT"
+    D_ARGS="-Dnewt.debug.Screen -Dnewt.debug.EDT -Djogamp.debug.Lock"
     #D_ARGS="-Dnewt.debug.EDT"
-    D_ARGS="-Dnewt.debug.EDT -Djogl.debug=all -Dnativewindow.debug=all"
+    #D_ARGS="-Dnewt.debug.EDT -Djogl.debug=all -Dnativewindow.debug=all"
     # D_ARGS="-Djogl.debug=all"
+    X_ARGS="-Dsun.java2d.noddraw=true -Dsun.java2d.opengl=false"
     java $awtarg $X_ARGS $D_ARGS $* 2>&1 | tee -a java-run.log
 }
 
@@ -42,7 +43,7 @@ function testawt() {
     jrun -Djava.awt.headless=false $*
 }
 
-testnoawt com.jogamp.test.junit.jogl.acore.TestGLProfile01NEWT $*
+#testnoawt com.jogamp.test.junit.jogl.acore.TestGLProfile01NEWT $*
 #testawt com.jogamp.test.junit.jogl.acore.TestGLProfile01NEWT $*
 
 #testawt com.jogamp.test.junit.jogl.awt.TestAWT01GLn $*
@@ -71,8 +72,8 @@ testnoawt com.jogamp.test.junit.jogl.acore.TestGLProfile01NEWT $*
 #testawt com.jogamp.test.junit.newt.parenting.TestParenting02NEWT
 
 #testawt com.jogamp.test.junit.newt.TestScreenMode00NEWT
-#testawt com.jogamp.test.junit.newt.TestScreenMode01NEWT
-#testawt com.jogamp.test.junit.newt.TestScreenMode02NEWT
+testnoawt com.jogamp.test.junit.newt.TestScreenMode01NEWT
+#testnoawt com.jogamp.test.junit.newt.TestScreenMode02NEWT
 
 #testawt com.jogamp.test.junit.newt.TestGLWindows01NEWT
 #testawt -Djava.awt.headless=true com.jogamp.test.junit.newt.TestGLWindows01NEWT
diff --git a/src/newt/classes/com/jogamp/newt/impl/WindowImpl.java b/src/newt/classes/com/jogamp/newt/impl/WindowImpl.java
index 7d80712e6..dfa768147 100644
--- a/src/newt/classes/com/jogamp/newt/impl/WindowImpl.java
+++ b/src/newt/classes/com/jogamp/newt/impl/WindowImpl.java
@@ -163,11 +163,21 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
          */
         void destroyActionInLock(boolean unrecoverable);
 
-        /** Only informal, when starting reparenting */
-        void reparentActionPre();
+        /**
+         * Invoked for expensive modifications, ie while reparenting and ScreenMode change.<br>
+         * No lock is hold when invoked.<br>
+         *
+         * @see #resumeRenderingAction()
+         */
+        void pauseRenderingAction();
 
-        /** Only informal, when finishing reparenting */
-        void reparentActionPost(int reparentActionType);
+        /**
+         * Invoked for expensive modifications, ie while reparenting and ScreenMode change.
+         * No lock is hold when invoked.<br>
+         *
+         * @see #pauseRenderingAction()
+         */
+        void resumeRenderingAction();
     }
 
     private LifecycleHook lifecycleHook = null;
@@ -475,13 +485,11 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
 
     class VisibleAction implements Runnable {
         boolean visible;
-        long timeOut;
         boolean nativeWindowCreated;
         boolean madeVisible;
 
-        public VisibleAction (boolean visible, long timeOut) {
+        public VisibleAction (boolean visible) {
             this.visible = visible;
-            this.timeOut = timeOut;
             this.nativeWindowCreated = false;
             this.madeVisible = false;
         }
@@ -510,13 +518,13 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
                 if(0==windowHandle && visible) {
                     if( 0<width*height ) {
                         nativeWindowCreated = createNative();
-                        WindowImpl.this.waitForVisible(visible, true, timeOut);
+                        WindowImpl.this.waitForVisible(visible, true);
                         madeVisible = visible;
                     }
                 } else if(WindowImpl.this.visible != visible) {
                     if(0 != windowHandle) {
                         setVisibleImpl(visible, x, y, width, height);
-                        WindowImpl.this.waitForVisible(visible, true, timeOut);
+                        WindowImpl.this.waitForVisible(visible, true);
                         madeVisible = visible;
                     }
                 }
@@ -545,17 +553,12 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
     }
 
     public void setVisible(boolean visible) {
-        setVisible(visible, TIMEOUT_NATIVEWINDOW);
-
-    }
-
-    protected final void setVisible(boolean visible, long timeOut) {
         if(isValid()) {
             if( 0==windowHandle && visible && 0>=width*height ) {
                 // fast-path: not realized yet, make visible, but zero size
                 return;
             }
-            VisibleAction visibleAction = new VisibleAction(visible, timeOut);
+            VisibleAction visibleAction = new VisibleAction(visible);
             runOnEDTIfAvail(true, visibleAction);
             if( visibleAction.getChanged() ) {
                 sendWindowEvent(WindowEvent.EVENT_WINDOW_RESIZED); // trigger a resize/relayout and repaint to listener
@@ -1034,20 +1037,20 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
         int reparentActionStrategy = ReparentAction.ACTION_INVALID;
         if(isValid()) {
             if(null!=lifecycleHook) {
-                lifecycleHook.reparentActionPre();
+                // pause animation
+                lifecycleHook.pauseRenderingAction();
             }
             try {
                 ReparentActionImpl reparentAction = new ReparentActionImpl(newParent, forceDestroyCreate);
                 runOnEDTIfAvail(true, reparentAction);
                 reparentActionStrategy = reparentAction.getStrategy();
-                if( isVisible() ) {
-                    sendWindowEvent(WindowEvent.EVENT_WINDOW_RESIZED); // trigger a resize/relayout and repaint to listener
-                }
             } finally {
                 if(null!=lifecycleHook) {
-                    lifecycleHook.reparentActionPost(reparentActionStrategy);
+                    // resume animation
+                    lifecycleHook.resumeRenderingAction();
                 }
             }
+            sendWindowEvent(WindowEvent.EVENT_WINDOW_RESIZED); // trigger a resize/relayout and repaint to listener
         }
         return reparentActionStrategy;
     }
@@ -1379,7 +1382,7 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
                     display.dispatchMessagesNative(); // status up2date
                     boolean wasVisible = isVisible();
                     setVisibleImpl(false, x, y, width, height);
-                    WindowImpl.this.waitForVisible(false, true, Screen.SCREEN_MODE_CHANGE_TIMEOUT);
+                    WindowImpl.this.waitForVisible(false, true);
                     display.dispatchMessagesNative(); // status up2date
 
                     // write back mirrored values, to be able to detect satisfaction
@@ -1429,29 +1432,21 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
         return this.fullscreen;
     }
 
-    boolean screenModeChangeVisible;
-    boolean screenModeChangeFullscreen;
-
     public void screenModeChangeNotify(ScreenMode sm) {
         if(DEBUG_IMPLEMENTATION || DEBUG_WINDOW_EVENT) {
             System.err.println("Window.screenModeChangeNotify: "+sm);
         }
-        screenModeChangeFullscreen = isFullscreen();
-        if(screenModeChangeFullscreen) {
-            setFullscreen(false);
-        }
-        screenModeChangeVisible = isVisible();
-        if(screenModeChangeVisible) {
-            setVisible(false);
+
+        if(null!=lifecycleHook) {
+            // pause animation
+            lifecycleHook.pauseRenderingAction();
         }
-        windowLock.lock();
     }
 
     public void screenModeChanged(ScreenMode sm, boolean success) {
         if(DEBUG_IMPLEMENTATION || DEBUG_WINDOW_EVENT) {
             System.err.println("Window.screenModeChanged: "+sm+", success: "+success);
         }
-        windowLock.unlock();
 
         if(success) {
             DimensionReadOnly screenSize = sm.getMonitorMode().getSurfaceSize().getResolution();
@@ -1460,11 +1455,11 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
                 setSize(screenSize.getWidth(), screenSize.getHeight());
             }
         }
-        if(screenModeChangeFullscreen) {
-            setFullscreen(true);
-        }
-        if(screenModeChangeVisible) {
-            setVisible(true, Screen.SCREEN_MODE_CHANGE_TIMEOUT);
+
+        if(null!=lifecycleHook) {
+            // resume animation
+            lifecycleHook.resumeRenderingAction();
+            sendWindowEvent(WindowEvent.EVENT_WINDOW_RESIZED); // trigger a resize/relayout and repaint to listener
         }
     }
 
diff --git a/src/newt/classes/com/jogamp/newt/impl/x11/X11Screen.java b/src/newt/classes/com/jogamp/newt/impl/x11/X11Screen.java
index 3f49b5e79..5e89a9972 100644
--- a/src/newt/classes/com/jogamp/newt/impl/x11/X11Screen.java
+++ b/src/newt/classes/com/jogamp/newt/impl/x11/X11Screen.java
@@ -211,51 +211,34 @@ public class X11Screen extends ScreenImpl {
         if(0>resIdx || resIdx>=resNumber) {
             throw new RuntimeException("Invalid resolution index: ! 0 < "+resIdx+" < "+resNumber+", screenMode["+screenModeIdx+"] "+screenMode);
         }
-        String tname = Thread.currentThread()+"-X11Screen.setCurrentScreenModeImpl()";
-        SetScreenModeAction setScreenModeAction = new SetScreenModeAction(screenMode, resIdx);
-        Thread randrTask = new Thread(setScreenModeAction, tname);
-        randrTask.start();
-        int to = SCREEN_MODE_CHANGE_TIMEOUT / 100 ;
-        while(to>0 && randrTask.isAlive()) {
-            try {
-                Thread.sleep(100);
-            } catch (InterruptedException ex) { }
-            to--;
-        }
-        if(0==to && DEBUG) {
-            System.err.println("X11Screen.setCurrentScreenModeImpl: TO ("+SCREEN_MODE_CHANGE_TIMEOUT+") reached: "+
-                               randrTask+", alive "+randrTask.isAlive());
-        }
-        return setScreenModeAction.getResult();
-    }
-
-    class SetScreenModeAction implements Runnable {
-        boolean res;
-        ScreenMode screenMode;
-        int resIdx;
 
-        public SetScreenModeAction(ScreenMode screenMode, int resIdx) {
-            this.screenMode = screenMode;
-            this.resIdx = resIdx;
-            this.res = false;
+        long dpy = X11Util.createDisplay(display.getName());
+        if( 0 == dpy ) {
+            throw new RuntimeException("Error creating display: "+display.getName());
         }
 
-        public boolean getResult() {
-            return res;
+        boolean done = false;
+        long t0 = System.currentTimeMillis();
+        try {
+            int f = screenMode.getMonitorMode().getRefreshRate();
+            int r = screenMode.getRotation();
+            if( setCurrentScreenModeStart0(dpy, screen_idx, resIdx, f, r) ) {
+                while(!done && System.currentTimeMillis()-t0 < SCREEN_MODE_CHANGE_TIMEOUT) {
+                    done = setCurrentScreenModePollEnd0(dpy, screen_idx, resIdx, f, r);
+                    if(!done) {
+                        Thread.yield();
+                    }
+                }
+            }
+        } finally {
+            X11Util.closeDisplay(dpy);
         }
 
-        public void run() {
-            long dpy = X11Util.createDisplay(display.getName());
-            if( 0 == dpy ) {
-                throw new RuntimeException("Error creating display: "+display.getName());
-            }
-            try {
-                res = setCurrentScreenMode0(dpy, screen_idx, resIdx,
-                                            screenMode.getMonitorMode().getRefreshRate(), screenMode.getRotation());
-            } finally {
-                X11Util.closeDisplay(dpy);
-            }
+        if(!done) {
+            System.err.println("X11Screen.setCurrentScreenModeImpl: TO ("+SCREEN_MODE_CHANGE_TIMEOUT+") reached: "+
+                               (System.currentTimeMillis()-t0)+"ms");
         }
+        return done;
     }
 
     //----------------------------------------------------------------------
@@ -282,5 +265,6 @@ public class X11Screen extends ScreenImpl {
     private static native int getCurrentScreenRotation0(long display, int screen_index);
 
     /** needs own Display connection for XRANDR event handling */
-    private static native boolean setCurrentScreenMode0(long display, int screen_index, int mode_index, int freq, int rot);
+    private static native boolean setCurrentScreenModeStart0(long display, int screen_index, int mode_index, int freq, int rot);
+    private static native boolean setCurrentScreenModePollEnd0(long display, int screen_index, int mode_index, int freq, int rot);
 }
diff --git a/src/newt/classes/com/jogamp/newt/opengl/GLWindow.java b/src/newt/classes/com/jogamp/newt/opengl/GLWindow.java
index 7836bec68..36302c55a 100644
--- a/src/newt/classes/com/jogamp/newt/opengl/GLWindow.java
+++ b/src/newt/classes/com/jogamp/newt/opengl/GLWindow.java
@@ -367,7 +367,7 @@ public class GLWindow implements GLAutoDrawable, Window {
 
         boolean animatorPaused = false;
 
-        public synchronized void reparentActionPre() {
+        public synchronized void pauseRenderingAction() {
             GLAnimatorControl ctrl = GLWindow.this.getAnimator();
             if ( null!=ctrl && ctrl.isAnimating() && ctrl.getThread() != Thread.currentThread() ) {
                 animatorPaused = true;
@@ -375,7 +375,7 @@ public class GLWindow implements GLAutoDrawable, Window {
             }
         }
 
-        public synchronized void reparentActionPost(int reparentActionType) {
+        public synchronized void resumeRenderingAction() {
             resetCounter();
             GLAnimatorControl ctrl = GLWindow.this.getAnimator();
             if ( null!=ctrl && animatorPaused ) {
@@ -384,6 +384,7 @@ public class GLWindow implements GLAutoDrawable, Window {
             }
         }
     }
+
     //----------------------------------------------------------------------
     // OpenGL-related methods and state
     //
diff --git a/src/newt/native/X11Window.c b/src/newt/native/X11Window.c
index 7b09ffeb0..becfa7596 100644
--- a/src/newt/native/X11Window.c
+++ b/src/newt/native/X11Window.c
@@ -43,6 +43,7 @@
   #include <stdint.h>
 #endif
 #include <unistd.h>
+#include <errno.h>
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
 #include <X11/keysym.h>
@@ -175,16 +176,15 @@ static XErrorHandler origErrorHandler = NULL ;
 
 static int displayDispatchErrorHandler(Display *dpy, XErrorEvent *e)
 {
-    fprintf(stderr, "Warning: NEWT X11 Error: DisplayDispatch %p, Code 0x%X\n", dpy, e->error_code);
+    fprintf(stderr, "Warning: NEWT X11 Error: DisplayDispatch %p, Code 0x%X, errno %s\n", dpy, e->error_code, strerror(errno));
     
-    if (e->error_code == BadAtom)
-    {
+    if (e->error_code == BadAtom) {
         fprintf(stderr, "         BadAtom (%p): Atom probably already removed\n", (void*)e->resourceid);
-    } else if (e->error_code == BadWindow)
-    {
+    } else if (e->error_code == BadWindow) {
         fprintf(stderr, "         BadWindow (%p): Window probably already removed\n", (void*)e->resourceid);
     } else {
-        NewtCommon_throwNewRuntimeException(x11ErrorHandlerJNIEnv, "NEWT X11 Error: Display %p, Code 0x%X", dpy, e->error_code);
+        NewtCommon_throwNewRuntimeException(x11ErrorHandlerJNIEnv, "NEWT X11 Error: Display %p, Code 0x%X, errno %s", 
+            dpy, e->error_code, strerror(errno));
     }
 
     return 0;
@@ -197,8 +197,10 @@ static void displayDispatchErrorHandlerEnable(int onoff, JNIEnv * env) {
             origErrorHandler = XSetErrorHandler(displayDispatchErrorHandler);
         }
     } else {
-        XSetErrorHandler(origErrorHandler);
-        origErrorHandler = NULL;
+        if(NULL!=origErrorHandler) {
+            XSetErrorHandler(origErrorHandler);
+            origErrorHandler = NULL;
+        }
     }
 }
 
@@ -850,7 +852,6 @@ JNIEXPORT jintArray JNICALL Java_com_jogamp_newt_impl_x11_X11Screen_getAvailable
     int major, minor;
 
     if(False == NewtScreen_getRANDRVersion(dpy, &major, &minor)) {
-        DBG_PRINT(stderr, "Java_com_jogamp_newt_impl_x11_X11Screen_getAvailableScreenModeRotations0: RANDR not available\n");
         fprintf(stderr, "RANDR not available\n");
         return (*env)->NewIntArray(env, 0);
     }
@@ -897,7 +898,7 @@ JNIEXPORT jint JNICALL Java_com_jogamp_newt_impl_x11_X11Screen_getNumScreenModeR
     Window root = RootWindow(dpy, (int)scrn_idx);
     
     if(False == NewtScreen_hasRANDR(dpy)) {
-        DBG_PRINT(stderr, "Java_com_jogamp_newt_impl_x11_X11Screen_getNumScreenModeResolutions0: RANDR not available\n");
+        DBG_PRINT("Java_com_jogamp_newt_impl_x11_X11Screen_getNumScreenModeResolutions0: RANDR not available\n");
         return 0;
     }
 
@@ -919,7 +920,7 @@ JNIEXPORT jintArray JNICALL Java_com_jogamp_newt_impl_x11_X11Screen_getScreenMod
     Window root = RootWindow(dpy, (int)scrn_idx);
     
     if(False == NewtScreen_hasRANDR(dpy)) {
-        DBG_PRINT(stderr, "Java_com_jogamp_newt_impl_x11_X11Screen_getScreenModeResolution0: RANDR not available\n");
+        DBG_PRINT("Java_com_jogamp_newt_impl_x11_X11Screen_getScreenModeResolution0: RANDR not available\n");
         return (*env)->NewIntArray(env, 0);
     }
 
@@ -962,7 +963,7 @@ JNIEXPORT jintArray JNICALL Java_com_jogamp_newt_impl_x11_X11Screen_getScreenMod
     Window root = RootWindow(dpy, (int)scrn_idx);
     
     if(False == NewtScreen_hasRANDR(dpy)) {
-        DBG_PRINT(stderr, "Java_com_jogamp_newt_impl_x11_X11Screen_getScreenModeRates0: RANDR not available\n");
+        DBG_PRINT("Java_com_jogamp_newt_impl_x11_X11Screen_getScreenModeRates0: RANDR not available\n");
         return (*env)->NewIntArray(env, 0);
     }
 
@@ -1006,7 +1007,7 @@ JNIEXPORT jint JNICALL Java_com_jogamp_newt_impl_x11_X11Screen_getCurrentScreenR
     Window root = RootWindow(dpy, (int)scrn_idx);
     
     if(False == NewtScreen_hasRANDR(dpy)) {
-        DBG_PRINT(stderr, "Java_com_jogamp_newt_impl_x11_X11Screen_getCurrentScreenRate0: RANDR not available\n");
+        DBG_PRINT("Java_com_jogamp_newt_impl_x11_X11Screen_getCurrentScreenRate0: RANDR not available\n");
         return -1;
     }
 
@@ -1032,7 +1033,7 @@ JNIEXPORT jint JNICALL Java_com_jogamp_newt_impl_x11_X11Screen_getCurrentScreenR
     Window root = RootWindow(dpy, (int)scrn_idx);
     
     if(False == NewtScreen_hasRANDR(dpy)) {
-        DBG_PRINT(stderr, "Java_com_jogamp_newt_impl_x11_X11Screen_getCurrentScreenRotation0: RANDR not available\n");
+        DBG_PRINT("Java_com_jogamp_newt_impl_x11_X11Screen_getCurrentScreenRotation0: RANDR not available\n");
         return -1;
     }
 
@@ -1061,7 +1062,7 @@ JNIEXPORT jint JNICALL Java_com_jogamp_newt_impl_x11_X11Screen_getCurrentScreenR
    Window root = RootWindow(dpy, (int)scrn_idx);
   
    if(False == NewtScreen_hasRANDR(dpy)) {
-       DBG_PRINT(stderr, "Java_com_jogamp_newt_impl_x11_X11Screen_getCurrentScreenResolutionIndex0: RANDR not available\n");
+       DBG_PRINT("Java_com_jogamp_newt_impl_x11_X11Screen_getCurrentScreenResolutionIndex0: RANDR not available\n");
        return -1;
    }
 
@@ -1080,24 +1081,20 @@ JNIEXPORT jint JNICALL Java_com_jogamp_newt_impl_x11_X11Screen_getCurrentScreenR
 
 /*
  * Class:     com_jogamp_newt_impl_x11_X11Screen
- * Method:    setScreenMode0
+ * Method:    setCurrentScreenModeStart0
  * Signature: (JIIII)Z
  */
-JNIEXPORT jboolean JNICALL Java_com_jogamp_newt_impl_x11_X11Screen_setCurrentScreenMode0
+JNIEXPORT jboolean JNICALL Java_com_jogamp_newt_impl_x11_X11Screen_setCurrentScreenModeStart0
   (JNIEnv *env, jclass clazz, jlong display, jint screen_idx, jint resMode_idx, jint freq, jint rotation)
 {
-    int randr_event_base, randr_error_base;
     Display *dpy = (Display *) (intptr_t) display;
     Window root = RootWindow(dpy, (int)screen_idx);
 
     if(False == NewtScreen_hasRANDR(dpy)) {
-        DBG_PRINT(stderr, "Java_com_jogamp_newt_impl_x11_X11Screen_setCurrentScreenMode0: RANDR not available\n");
+        DBG_PRINT("Java_com_jogamp_newt_impl_x11_X11Screen_setCurrentScreenModeStart0: RANDR not available\n");
         return JNI_FALSE;
     }
 
-    XRRQueryExtension(dpy, &randr_event_base, &randr_error_base);
-    DBG_PRINT("RANDR: event_base: %d\n", randr_event_base);
-
     int num_sizes;   
     XRRScreenSize *xrrs = XRRSizes(dpy, (int)screen_idx, &num_sizes); //get possible screen resolutions
     XRRScreenConfiguration *conf;
@@ -1134,12 +1131,48 @@ JNIEXPORT jboolean JNICALL Java_com_jogamp_newt_impl_x11_X11Screen_setCurrentScr
     XSync(dpy, False);
     XRRSetScreenConfigAndRate(dpy, conf, root, (int)resMode_idx, rot, (short)freq, CurrentTime);   
     XSync(dpy, False);
-   
+
+    //free
+    XRRFreeScreenConfigInfo(conf);
+    XSync(dpy, False);
+
+    return JNI_TRUE;
+}
+
+/*
+ * Class:     com_jogamp_newt_impl_x11_X11Screen
+ * Method:    setCurrentScreenModePollEnd0
+ * Signature: (J)Z
+ */
+JNIEXPORT jboolean JNICALL Java_com_jogamp_newt_impl_x11_X11Screen_setCurrentScreenModePollEnd0
+  (JNIEnv *env, jclass clazz, jlong display, jint screen_idx, jint resMode_idx, jint freq, jint rotation)
+{
+    Display *dpy = (Display *) (intptr_t) display;
+    int randr_event_base, randr_error_base;
     XEvent evt;
     XRRScreenChangeNotifyEvent * scn_event = (XRRScreenChangeNotifyEvent *) &evt;
+
+    if(False == NewtScreen_hasRANDR(dpy)) {
+        DBG_PRINT("Java_com_jogamp_newt_impl_x11_X11Screen_setCurrentScreenModePollEnd0: RANDR not available\n");
+        return JNI_FALSE;
+    }
+
+    int num_sizes;   
+    XRRScreenSize *xrrs = XRRSizes(dpy, (int)screen_idx, &num_sizes); //get possible screen resolutions
+    XRRScreenConfiguration *conf;
+    
+    if( 0 > resMode_idx || resMode_idx >= num_sizes ) {
+        NewtCommon_throwNewRuntimeException(env, "Invalid resolution index: ! 0 < %d < %d", resMode_idx, num_sizes);
+    }
+
+    XRRQueryExtension(dpy, &randr_event_base, &randr_error_base);
+
     int done = 0;
+    int rot;
     do {
-        // XWindowEvent(dpy, root, randr_event_base + RRScreenChangeNotify, &evt);
+        if ( 0 >= XEventsQueued(dpy, QueuedAfterFlush) ) {
+            return;
+        }
         XNextEvent(dpy, &evt);
 
         switch (evt.type - randr_event_base) {
@@ -1160,11 +1193,8 @@ JNIEXPORT jboolean JNICALL Java_com_jogamp_newt_impl_x11_X11Screen_setCurrentScr
         XRRUpdateConfiguration(&evt);
     } while(!done);
 
-    //free
-    XRRFreeScreenConfigInfo(conf);
     XSync(dpy, False);
 
-    return JNI_TRUE;
 }
 
 /**