--- threading.c	2009-02-20 10:34:08.000000000 -0600
+++ threading-patched.c	2009-02-20 10:29:19.000000000 -0600
@@ -444,8 +444,9 @@
 {
 #if (NUM_THREADS>1)
   pthread_mutex_lock(&update_lock);
-#endif  
-  ln->synch = 0;
+#endif
+  if (t==ln->synch)   
+      ln->synch = 0;
 
 #if (NUM_THREADS>1)  
   pthread_mutex_unlock(&update_lock);