prevention of possible ConcurrentModificationException

This happend at my peer and created a deadlock.

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@2179 6c8d7289-2bf4-0310-a012-ef5d649a1542

source/de/anomic/index/indexTreeMapContainer.java

@@ -108,13 +108,15 @@ public final class indexTreeMapContainer extends indexAbstractContainer implemen
         // returns the number of new elements
         long startTime = System.currentTimeMillis();
         if (c == null) return 0;
-        Iterator i = c.entries();
         int x = 0;
+        synchronized (c) {
+            Iterator i = c.entries();
             while ((i.hasNext()) && ((maxTime < 0) || ((startTime + maxTime) > System.currentTimeMillis()))) {
                 try {
                     if (addi((indexURLEntry) i.next())) x++;
                 } catch (ConcurrentModificationException e) {}
             }
+        }
         this.updateTime = java.lang.Math.max(this.updateTime, c.updated());
         return x;
     }