diff --git a/packages/xdc/services/global/Clock.java b/packages/xdc/services/global/Clock.java
new file mode 100644
index 0000000..661c565
--- /dev/null
+++ b/packages/xdc/services/global/Clock.java
@@ -0,0 +1,34 @@
+package xdc.services.global;
+
+public class Clock {
+    
+    static private boolean master = false;
+    
+    private long t0 = 0;
+    private long prev = 0;
+    private boolean enabled = false;
+    
+    public void enable()
+    {
+        enabled = true;
+    }
+    
+    public void print( String msg )
+    {
+        if (master && enabled) {
+            long cur = System.currentTimeMillis();
+            System.out.printf("%s [%d]\n", msg, cur - prev);
+            prev = cur;
+        }
+    }
+    
+    public void reset()
+    {
+        prev = t0 = System.currentTimeMillis();
+    }
+    
+    public long total()
+    {
+        return System.currentTimeMillis() - t0;
+    }
+}