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