2 files changed, 51 insertions, 12 deletions

diff --git a/src/nativewindow/classes/com/jogamp/nativewindow/impl/x11/X11Util.java b/src/nativewindow/classes/com/jogamp/nativewindow/impl/x11/X11Util.java
index 524b142ec..c449d8f86 100644
--- a/src/nativewindow/classes/com/jogamp/nativewindow/impl/x11/X11Util.java
+++ b/src/nativewindow/classes/com/jogamp/nativewindow/impl/x11/X11Util.java
@@ -33,8 +33,6 @@
 
 package com.jogamp.nativewindow.impl.x11;
 
-import java.util.HashMap;
-import java.util.Map;
 import com.jogamp.common.util.LongObjectHashMap;
 
 import javax.media.nativewindow.*;
@@ -58,6 +56,9 @@ public class X11Util {
     private static boolean isFirstX11ActionOnProcess = false;
     private static boolean isInit = false;
 
+    private static int setX11ErrorHandlerRecCount = 0;
+    private static Object setX11ErrorHandlerLock = new Object();
+
     public static synchronized void initSingleton(boolean firstX11ActionOnProcess) {
         if(!isInit) {
             NWJNILibLoader.loadNativeWindow("x11");
@@ -65,8 +66,8 @@ public class X11Util {
             /**
              * Always issue XInitThreads() since we have independent
              * off-thread created Display connections able to utilize multithreading, ie NEWT */
-            initialize( true );
-            // initialize( firstX11ActionOnProcess );
+            initialize0( true );
+            // initialize0( firstX11ActionOnProcess );
             isFirstX11ActionOnProcess = firstX11ActionOnProcess;
 
             if(DEBUG) {
@@ -76,6 +77,25 @@ public class X11Util {
         }
     }
 
+    public static void setX11ErrorHandler(boolean onoff) {
+        synchronized(setX11ErrorHandlerLock) {
+            if(onoff) {
+                if(0==setX11ErrorHandlerRecCount) {
+                    setX11ErrorHandler0(true);
+                }
+                setX11ErrorHandlerRecCount++;
+            } else {
+                if(0 >= setX11ErrorHandlerRecCount) {
+                    throw new InternalError();
+                }
+                setX11ErrorHandlerRecCount--;
+                if(0==setX11ErrorHandlerRecCount) {
+                    setX11ErrorHandler0(false);
+                }
+            }
+        }
+    }
+
     public static boolean isFirstX11ActionOnProcess() {
         return isFirstX11ActionOnProcess;
     }
@@ -574,5 +594,6 @@ public class X11Util {
         X11Lib.XUnlockDisplay(handle);
     }
 
-    private static native void initialize(boolean firstUIActionOnProcess);
+    private static native void initialize0(boolean firstUIActionOnProcess);
+    private static native void setX11ErrorHandler0(boolean onoff);
 }
diff --git a/src/nativewindow/native/x11/Xmisc.c b/src/nativewindow/native/x11/Xmisc.c
index 5a17bdb8f..831d94636 100644
--- a/src/nativewindow/native/x11/Xmisc.c
+++ b/src/nativewindow/native/x11/Xmisc.c
@@ -181,20 +181,25 @@ static void _throwNewRuntimeException(Display * unlockDisplay, JNIEnv *env, cons
 
 static JNIEnv * x11ErrorHandlerJNIEnv = NULL;
 static XErrorHandler origErrorHandler = NULL ;
+static int errorHandlerBlocked = 0 ;
 
 static int x11ErrorHandler(Display *dpy, XErrorEvent *e)
 {
-    fprintf(stderr, "Nativewindow X11 Error: Display %p, Code 0x%X, errno %s\n", dpy, e->error_code, strerror(errno));
-    _throwNewRuntimeException(NULL, x11ErrorHandlerJNIEnv, "Nativewindow X11 Error: Display %p, Code 0x%X, errno %s", 
+    _throwNewRuntimeException(NULL, x11ErrorHandlerJNIEnv, "Info: Nativewindow X11 Error: Display %p, Code 0x%X, errno %s", 
         dpy, e->error_code, strerror(errno));
+
+#if 0
     if(NULL!=origErrorHandler) {
         origErrorHandler(dpy, e);
     }
+#endif
 
     return 0;
 }
 
 static void x11ErrorHandlerEnable(Display *dpy, int onoff, JNIEnv * env) {
+    if(errorHandlerBlocked) return;
+
     if(onoff) {
         if(NULL==origErrorHandler) {
             x11ErrorHandlerJNIEnv = env;
@@ -204,14 +209,22 @@ static void x11ErrorHandlerEnable(Display *dpy, int onoff, JNIEnv * env) {
             origErrorHandler = XSetErrorHandler(x11ErrorHandler);
         }
     } else {
-        if(NULL!=dpy) {
-            XSync(dpy, False);
+        if(NULL!=origErrorHandler) {
+            if(NULL!=dpy) {
+                XSync(dpy, False);
+            }
+            XSetErrorHandler(origErrorHandler);
+            origErrorHandler = NULL;
         }
-        XSetErrorHandler(origErrorHandler);
-        origErrorHandler = NULL;
     }
 }
 
+static void x11ErrorHandlerEnableBlocking(int onoff, JNIEnv * env) {
+    errorHandlerBlocked = 0 ;
+    x11ErrorHandlerEnable(NULL, onoff, env);
+    errorHandlerBlocked = onoff ;
+}
+
 
 static XIOErrorHandler origIOErrorHandler = NULL;
 
@@ -240,7 +253,7 @@ static void x11IOErrorHandlerEnable(int onoff, JNIEnv * env) {
 static int _initialized=0;
 
 JNIEXPORT void JNICALL 
-Java_com_jogamp_nativewindow_impl_x11_X11Util_initialize(JNIEnv *env, jclass _unused, jboolean firstUIActionOnProcess) {
+Java_com_jogamp_nativewindow_impl_x11_X11Util_initialize0(JNIEnv *env, jclass _unused, jboolean firstUIActionOnProcess) {
     if(0==_initialized) {
         if( JNI_TRUE == firstUIActionOnProcess ) {
             if( 0 == XInitThreads() ) {
@@ -258,6 +271,11 @@ Java_com_jogamp_nativewindow_impl_x11_X11Util_initialize(JNIEnv *env, jclass _un
     }
 }
 
+JNIEXPORT void JNICALL 
+Java_com_jogamp_nativewindow_impl_x11_X11Util_setX11ErrorHandler0(JNIEnv *env, jclass _unused, jboolean onoff) {
+  x11ErrorHandlerEnableBlocking(( JNI_TRUE == onoff ) ? 1 : 0, env);
+}
+
 /*   Java->C glue code:
  *   Java package: com.jogamp.nativewindow.impl.x11.X11Lib
  *    Java method: XVisualInfo XGetVisualInfo(long arg0, long arg1, XVisualInfo arg2, java.nio.IntBuffer arg3)