diff --git a/bundles/org.eclipse.swt/Eclipse SWT/cocoa/org/eclipse/swt/widgets/Display.java b/bundles/org.eclipse.swt/Eclipse SWT/cocoa/org/eclipse/swt/widgets/Display.java
index 7e1054a..d950489 100644
--- a/bundles/org.eclipse.swt/Eclipse SWT/cocoa/org/eclipse/swt/widgets/Display.java
+++ b/bundles/org.eclipse.swt/Eclipse SWT/cocoa/org/eclipse/swt/widgets/Display.java
@@ -11,6 +11,7 @@
 package org.eclipse.swt.widgets;
 
 import java.util.*;
+import java.util.List;
 
 import org.eclipse.swt.*;
 import org.eclipse.swt.graphics.*;
@@ -4646,6 +4647,25 @@
 	return true;
 }
 
+/**
+ * Block spinning the event loop until {@link BlockCondition#isBlocked()}
+ * return false
+ * 
+ * @param block
+ *            the block condition
+ */
+public void block(BlockCondition block) {
+	checkDevice();
+	if( ! block.isBlocked() ) {
+		return;
+	}
+	while (block.isBlocked()) {
+		if (!readAndDispatch()) {
+			sleep();
+		}
+	}
+}
+
 int sourceProc (int info) {
 	return 0;
 }
@@ -5956,4 +5976,29 @@
 	return 0;
 }
 
+public static class BlockCondition {
+	private boolean blocked = true;
+	private List listenerList = new ArrayList();
+	
+	public void addListener(Runnable r) {
+		listenerList.add(r);
+	}
+	
+	public void removeListener(Runnable r) {
+		listenerList.remove(r);
+	}
+	
+	public boolean isBlocked() {
+		return blocked;
+	}
+	
+	public void unblock() {
+		blocked = false;
+		Object[] listeners = listenerList.toArray();
+		for( int i = 0; i < listeners.length; i++ ) {
+			((Runnable)listeners[i]).run();
+		}
+	}
+}
+
 }
diff --git a/bundles/org.eclipse.swt/Eclipse SWT/cocoa/org/eclipse/swt/widgets/Shell.java b/bundles/org.eclipse.swt/Eclipse SWT/cocoa/org/eclipse/swt/widgets/Shell.java
index 369e2e9..6c86984 100644
--- a/bundles/org.eclipse.swt/Eclipse SWT/cocoa/org/eclipse/swt/widgets/Shell.java
+++ b/bundles/org.eclipse.swt/Eclipse SWT/cocoa/org/eclipse/swt/widgets/Shell.java
@@ -16,6 +16,7 @@
 import org.eclipse.swt.events.*;
 import org.eclipse.swt.graphics.*;
 import org.eclipse.swt.internal.cocoa.*;
+import org.eclipse.swt.widgets.Display.BlockCondition;
 
 /**
  * Instances of this class represent the "windows"
@@ -2328,4 +2329,18 @@
 	closeWidget(true);
 }
 
+/**
+ * Open the shell and block until it is closed
+ */
+public void openBlocking() {
+	final BlockCondition c = new BlockCondition();
+	addDisposeListener(new DisposeListener() {
+		
+		public void widgetDisposed(DisposeEvent e) {
+			c.unblock();
+		}
+	});
+	open();
+	getDisplay().block(c);
+}
 }