Branch data     Line data    Source code

       1                 :            : /*
       2                 :            :  * Copyright (c) 2013 Nicira, Inc.
       3                 :            :  *
       4                 :            :  * Licensed under the Apache License, Version 2.0 (the "License");
       5                 :            :  * you may not use this file except in compliance with the License.
       6                 :            :  * You may obtain a copy of the License at:
       7                 :            :  *
       8                 :            :  *     http://www.apache.org/licenses/LICENSE-2.0
       9                 :            :  *
      10                 :            :  * Unless required by applicable law or agreed to in writing, software
      11                 :            :  * distributed under the License is distributed on an "AS IS" BASIS,
      12                 :            :  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      13                 :            :  * See the License for the specific language governing permissions and
      14                 :            :  * limitations under the License.
      15                 :            :  */
      16                 :            : 
      17                 :            : #include <config.h>
      18                 :            : #include "connectivity.h"
      19                 :            : #include "ovs-thread.h"
      20                 :            : #include "seq.h"
      21                 :            : 
      22                 :            : static struct seq *connectivity_seq;
      23                 :            : 
      24                 :            : /* Provides a global seq for connectivity changes.
      25                 :            :  *
      26                 :            :  * Connectivity monitoring modules should call seq_change() on the returned
      27                 :            :  * object whenever the status of a port changes, whether the cause is local or
      28                 :            :  * remote.
      29                 :            :  *
      30                 :            :  * Clients can seq_wait() on this object for changes to netdev flags, features,
      31                 :            :  * ethernet addresses, carrier changes, and bfd/cfm/lacp/stp status. */
      32                 :            : struct seq *
      33                 :     852223 : connectivity_seq_get(void)
      34                 :            : {
      35                 :            :     static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
      36                 :            : 
      37         [ +  + ]:     852223 :     if (ovsthread_once_start(&once)) {
      38                 :        702 :         connectivity_seq = seq_create();
      39                 :        702 :         ovsthread_once_done(&once);
      40                 :            :     }
      41                 :            : 
      42                 :     852223 :     return connectivity_seq;
      43                 :            : }