Do things in a slightly more thread-safe manner (whatever that means).

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@3148 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/presents/client/DeltaCalculator.java

@@ -1,5 +1,5 @@
 //
-// $Id: DeltaCalculator.java,v 1.6 2004/08/27 02:20:18 mdb Exp $
+// $Id: DeltaCalculator.java,v 1.7 2004/10/18 21:40:24 mdb Exp $
 //
 // Narya library - tools for developing networked games
 // Copyright (C) 2002-2004 Three Rings Design, Inc., All Rights Reserved
@@ -93,6 +93,15 @@ public class DeltaCalculator
         return _deltas[_deltas.length/2];
     }
 
+    /**
+     * Returns true if this calculator has enough data to compute a time
+     * delta estimate. Stick a fork in it!
+     */
+    public boolean isDone ()
+    {
+        return (_iter >= CLOCK_SYNC_PING_COUNT);
+    }
+
     /** The number of ping/pong iterations we've made. */
     protected int _iter;