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https://github.com/openvswitch/ovs
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ca6ba70092
struct list is a common name and can't be used in public headers. Signed-off-by: Thomas Graf <tgraf@noironetworks.com> Acked-by: Ben Pfaff <blp@nicira.com>
96 lines
3.5 KiB
C
96 lines
3.5 KiB
C
/* Copyright (c) 2011, 2012 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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#ifndef SERVER_H
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#define SERVER_H 1
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#include "hmap.h"
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#include "list.h"
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#include "shash.h"
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struct ovsdb;
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struct ovsdb_server;
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/* Abstract representation of an OVSDB client connection, not tied to any
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* particular network protocol. Protocol implementations
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* (e.g. jsonrpc-server.c) embed this in a larger data structure. */
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struct ovsdb_session {
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struct ovsdb_server *server;
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struct ovs_list completions;/* Completed triggers. */
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struct hmap waiters; /* "ovsdb_lock_waiter *"s by lock name. */
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};
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void ovsdb_session_init(struct ovsdb_session *, struct ovsdb_server *);
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void ovsdb_session_destroy(struct ovsdb_session *);
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struct ovsdb_lock_waiter *ovsdb_session_get_lock_waiter(
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const struct ovsdb_session *, const char *lock_name);
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/* A database lock.
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*
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* A lock always has one or more "lock waiters" kept on a list. The waiter at
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* the head of the list owns the lock. */
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struct ovsdb_lock {
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struct hmap_node hmap_node; /* In ovsdb_server's "locks" hmap. */
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struct ovsdb_server *server; /* The containing server. */
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char *name; /* Unique name. */
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struct ovs_list waiters; /* Contains "struct ovsdb_lock_waiter"s. */
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};
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struct ovsdb_lock_waiter *ovsdb_lock_get_owner(const struct ovsdb_lock *);
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/* How to obtain a lock. */
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enum ovsdb_lock_mode {
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OVSDB_LOCK_WAIT, /* By waiting for it to become available. */
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OVSDB_LOCK_STEAL /* By stealing it from the owner. */
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};
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/* A session's request for a database lock. */
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struct ovsdb_lock_waiter {
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struct hmap_node session_node; /* In ->session->locks's hmap. */
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struct ovsdb_lock *lock; /* The lock being waited for. */
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enum ovsdb_lock_mode mode;
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char *lock_name;
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struct ovsdb_session *session;
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struct ovs_list lock_node; /* In ->lock->waiters's list. */
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};
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struct ovsdb_session *ovsdb_lock_waiter_remove(struct ovsdb_lock_waiter *);
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void ovsdb_lock_waiter_destroy(struct ovsdb_lock_waiter *);
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bool ovsdb_lock_waiter_is_owner(const struct ovsdb_lock_waiter *);
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/* Abstract representation of an OVSDB server not tied to any particular
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* network protocol. Protocol implementations (e.g. jsonrpc-server.c) embed
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* this in a larger data structure. */
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struct ovsdb_server {
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struct shash dbs; /* Maps from a db name to a "struct ovsdb *". */
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struct hmap locks; /* Contains "struct ovsdb_lock"s indexed by name. */
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};
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void ovsdb_server_init(struct ovsdb_server *);
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bool ovsdb_server_add_db(struct ovsdb_server *, struct ovsdb *);
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bool ovsdb_server_remove_db(struct ovsdb_server *, struct ovsdb *);
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void ovsdb_server_destroy(struct ovsdb_server *);
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struct ovsdb_lock_waiter *ovsdb_server_lock(struct ovsdb_server *,
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struct ovsdb_session *,
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const char *lock_name,
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enum ovsdb_lock_mode,
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struct ovsdb_session **victimp);
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#endif /* ovsdb/server.h */
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