diff --git a/osm_openvim/openflow_thread.py b/osm_openvim/openflow_thread.py
index e41fb6b..a26b48e 100644
--- a/osm_openvim/openflow_thread.py
+++ b/osm_openvim/openflow_thread.py
@@ -2,7 +2,7 @@
 # -*- coding: utf-8 -*-
 
 ##
-# Copyright 2015 Telefónica Investigación y Desarrollo, S.A.U.
+# Copyright 2015 Telefonica Investigacion y Desarrollo, S.A.U.
 # This file is part of openvim
 # All Rights Reserved.
 #
@@ -93,14 +93,13 @@
     """
     This thread interacts with a openflow controller to create dataplane connections
     """
-    def __init__(self, of_uuid, of_connector, db, db_lock, of_test, pmp_with_same_vlan=False, logger_name=None,
+    def __init__(self, of_uuid, of_connector, db, of_test, pmp_with_same_vlan=False, logger_name=None,
                  debug=None):
         threading.Thread.__init__(self)
         self.of_uuid = of_uuid
         self.db = db
         self.pmp_with_same_vlan = pmp_with_same_vlan
         self.test = of_test
-        self.db_lock = db_lock
         self.OF_connector = of_connector
         if logger_name:
             self.logger_name = logger_name
@@ -155,9 +154,7 @@
                         UPDATE={'status':'ACTIVE', 'last_error': None}
                         self.logger.debug("processing task 'update-net' %s: OK", str(task[1]))
                         self.set_openflow_controller_status(OFC_STATUS_ACTIVE)
-                    self.db_lock.acquire()
                     self.db.update_rows('nets', UPDATE, WHERE={'uuid': task[1]})
-                    self.db_lock.release()
 
                 elif task[0] == 'clear-all':
                     r,c = self.clear_all_flows()
@@ -186,7 +183,6 @@
 
     def update_of_flows(self, net_id):
         ports=()
-        self.db_lock.acquire()
         select_= ('type','admin_state_up', 'vlan', 'provider', 'bind_net','bind_type','uuid')
         result, nets = self.db.get_table(FROM='nets', SELECT=select_, WHERE={'uuid':net_id} )
         #get all the networks binding to this
@@ -199,7 +195,6 @@
             result, nets = self.db.get_table(FROM='nets', SELECT=select_,
                                                 WHERE_OR={'bind_net':bind_id, 'uuid':bind_id} )
             
-        self.db_lock.release()
         if result < 0:
             return -1, "DB error getting net: " + nets
         #elif result==0:
@@ -211,12 +206,10 @@
             if net['admin_state_up'] == 'false':
                 net['ports'] = ()
             else:
-                self.db_lock.acquire()
                 nb_ports, net_ports = self.db.get_table(
                         FROM='ports',
                         SELECT=('switch_port','vlan','uuid','mac','type','model'),
                         WHERE={'net_id':net_id, 'admin_state_up':'true', 'status':'ACTIVE'} )
-                self.db_lock.release()
                 if nb_ports < 0:
 
                     #print self.name, ": update_of_flows() ERROR getting ports", ports
@@ -238,18 +231,14 @@
                 ifaces_nb += nb_ports
         
             # Get the name of flows that will be affected by this NET 
-            self.db_lock.acquire()
             result, database_net_flows = self.db.get_table(FROM='of_flows', WHERE={'net_id':net_id})
-            self.db_lock.release()
             if result < 0:
                 error_msg = "DB error getting flows from net '{}': {}".format(net_id, database_net_flows)
                 # print self.name, ": update_of_flows() ERROR getting flows from database", database_flows
                 return -1, error_msg
             database_flows += database_net_flows
         # Get the name of flows where net_id==NULL that means net deleted (At DB foreign key: On delete set null)
-        self.db_lock.acquire()
         result, database_net_flows = self.db.get_table(FROM='of_flows', WHERE={'net_id':None})
-        self.db_lock.release()
         if result < 0:
             error_msg = "DB error getting flows from net 'null': {}".format(database_net_flows)
             # print self.name, ": update_of_flows() ERROR getting flows from database", database_flows
@@ -355,9 +344,7 @@
             except FlowBadFormat as e:
                 # print self.name, ": Error Exception FlowBadFormat '%s'" % str(e), flow
                 return -1, str(e)
-            self.db_lock.acquire()
             result, content = self.db.new_row('of_flows', flow)
-            self.db_lock.release()
             if result < 0:
                 # print self.name, ": Error '%s' at database insertion" % content, flow
                 return -1, content
@@ -384,9 +371,7 @@
                     continue
 
             # delete from database
-            self.db_lock.acquire()
             result, content = self.db.delete_row_by_key('of_flows', 'id', flow['id'])
-            self.db_lock.release()
             if result<0:
                 self.logger.error("cannot delete flow '%s' from DB: %s", flow['name'], content )
         
@@ -398,9 +383,7 @@
                 self.OF_connector.clear_all_flows()
 
             # remove from database
-            self.db_lock.acquire()
             self.db.delete_row_by_key('of_flows', None, None) #this will delete all lines
-            self.db_lock.release()
             return 0, None
         except openflow_conn.OpenflowconnException as e:
             return -1, self.logger.error("Error deleting all flows {}", str(e))
@@ -595,9 +578,7 @@
         ofc = {}
         ofc['status'] = status
         ofc['last_error'] = self._format_error_msg(error_text, 255)
-        self.db_lock.acquire()
         result, content = self.db.update_rows('ofcs', ofc, WHERE={'uuid': self.of_uuid}, log=False)
-        self.db_lock.release()
         if result >= 0:
             return True
         else: