diff -r 1bb5fe96f61e -r 53acb8ec6c51 src/Pure/General/swing_thread.scala
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Pure/General/swing_thread.scala	Tue Jun 30 21:19:32 2009 +0200
@@ -0,0 +1,24 @@
+/*  Title:      Pure/General/swing_thread.scala
+    Author:     Makarius
+
+Evaluation within the AWT/Swing thread.
+*/
+
+package isabelle
+
+import javax.swing.SwingUtilities
+
+object Swing_Thread
+{
+  def now[A](body: => A): A = {
+    var result: Option[A] = None
+    if (SwingUtilities.isEventDispatchThread) { result = Some(body) }
+    else SwingUtilities.invokeAndWait(new Runnable { def run = { result = Some(body) } })
+    result.get
+  }
+
+  def later(body: => Unit) {
+    if (SwingUtilities.isEventDispatchThread) body
+    else SwingUtilities.invokeLater(new Runnable { def run = body })
+  }
+}