Index: jackrabbit-jcr2spi/src/main/java/org/apache/jackrabbit/jcr2spi/WorkspaceManager.java
===================================================================
--- jackrabbit-jcr2spi/src/main/java/org/apache/jackrabbit/jcr2spi/WorkspaceManager.java	(revision 818479)
+++ jackrabbit-jcr2spi/src/main/java/org/apache/jackrabbit/jcr2spi/WorkspaceManager.java	(working copy)
@@ -114,10 +114,8 @@
 import java.util.HashSet;
 import java.util.Map;
 import java.util.Collection;
+import java.util.concurrent.Semaphore;
 
-import EDU.oswego.cs.dl.util.concurrent.Sync;
-import EDU.oswego.cs.dl.util.concurrent.Mutex;
-
 /**
  * <code>WorkspaceManager</code>...
  */
@@ -141,11 +139,11 @@
     private final ItemDefinitionProvider definitionProvider;
 
     /**
-     * Mutex to synchronize the feed thread with client
+     * Semaphore to synchronize the feed thread with client
      * threads that call {@link #execute(Operation)} or {@link
      * #execute(ChangeLog)}.
      */
-    private final Sync updateSync = new Mutex();
+    private final Semaphore updateSync = new Semaphore(1);
 
     /**
      * This is the event polling for changes. If <code>null</code>