diff --git pthread/ypbind_comb.c pthread/ypbind_comb.c
index 255923b..4be088a 100644
--- pthread/ypbind_comb.c
+++ pthread/ypbind_comb.c
@@ -5628,16 +5628,19 @@ static bool_t eachresult(bool_t *out , struct sockaddr_in *addr )
     timeout___0.tv_sec = 1L;
 #line 595
     timeout___0.tv_usec = 0L;
-#line 596
+#line 596 
+    pthread_mutex_lock(& search_lock);
     in_use->client_handle = clntudp_create(addr, 100004UL, 2UL, timeout___0, & sock);
 #line 599
     if ((unsigned int )in_use->client_handle == (unsigned int )((void *)0)) {
 #line 600
+      pthread_mutex_unlock(& search_lock);
       return (0);
     }
 #line 602
     in_use->active = 0;
 #line 604
+    pthread_mutex_unlock(& search_lock);
     return (1);
   } else {
 #line 608