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/*
* Copyright (c) 2013 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include "connectivity.h"
#include "ovs-thread.h"
#include "seq.h"
static struct seq *connectivity_seq;
/* Provides a global seq for connectivity changes.
*
* Connectivity monitoring modules should call seq_change() on the returned
* object whenever the status of a port changes, whether the cause is local or
* remote.
*
* Clients can seq_wait() on this object for changes to netdev flags, features,
* ethernet addresses, carrier changes, and bfd/cfm/lacp/stp status. */
struct seq *
connectivity_seq_get(void)
{
static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
if (ovsthread_once_start(&once)) {
connectivity_seq = seq_create();
ovsthread_once_done(&once);
}
return connectivity_seq;
}
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