mirror of
https://github.com/openvswitch/ovs
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da897f41cd
This provides clients a way to coordinate their access to the database. This is a voluntary, not mandatory, locking protocols, that is, clients are not prevented from modifying the database unless they cooperate with the locking protocol. It is also not related to any of the ACID properties of database transactions. It is strictly a way for clients to coordinate among themselves. The following commit will introduce one user.
130 lines
3.3 KiB
C
130 lines
3.3 KiB
C
/* Copyright (c) 2009, 2010, 2011 Nicira Networks
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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 "trigger.h"
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#include <assert.h>
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#include <limits.h>
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#include "json.h"
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#include "jsonrpc.h"
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#include "ovsdb.h"
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#include "poll-loop.h"
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#include "server.h"
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static bool ovsdb_trigger_try(struct ovsdb_trigger *, long long int now);
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static void ovsdb_trigger_complete(struct ovsdb_trigger *);
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void
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ovsdb_trigger_init(struct ovsdb_session *session,
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struct ovsdb_trigger *trigger,
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struct json *request, long long int now)
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{
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trigger->session = session;
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list_push_back(&trigger->session->db->triggers, &trigger->node);
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trigger->request = request;
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trigger->result = NULL;
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trigger->created = now;
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trigger->timeout_msec = LLONG_MAX;
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ovsdb_trigger_try(trigger, now);
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}
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void
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ovsdb_trigger_destroy(struct ovsdb_trigger *trigger)
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{
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list_remove(&trigger->node);
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json_destroy(trigger->request);
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json_destroy(trigger->result);
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}
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bool
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ovsdb_trigger_is_complete(const struct ovsdb_trigger *trigger)
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{
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return trigger->result != NULL;
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}
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struct json *
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ovsdb_trigger_steal_result(struct ovsdb_trigger *trigger)
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{
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struct json *result = trigger->result;
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trigger->result = NULL;
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return result;
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}
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void
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ovsdb_trigger_run(struct ovsdb *db, long long int now)
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{
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struct ovsdb_trigger *t, *next;
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bool run_triggers;
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run_triggers = db->run_triggers;
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db->run_triggers = false;
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LIST_FOR_EACH_SAFE (t, next, node, &db->triggers) {
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if (run_triggers || now - t->created >= t->timeout_msec) {
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ovsdb_trigger_try(t, now);
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}
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}
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}
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void
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ovsdb_trigger_wait(struct ovsdb *db, long long int now)
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{
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if (db->run_triggers) {
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poll_immediate_wake();
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} else {
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long long int deadline = LLONG_MAX;
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struct ovsdb_trigger *t;
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LIST_FOR_EACH (t, node, &db->triggers) {
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if (t->created < LLONG_MAX - t->timeout_msec) {
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long long int t_deadline = t->created + t->timeout_msec;
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if (deadline > t_deadline) {
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deadline = t_deadline;
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if (now >= deadline) {
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break;
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}
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}
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}
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}
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if (deadline < LLONG_MAX) {
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poll_timer_wait_until(deadline);
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}
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}
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}
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static bool
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ovsdb_trigger_try(struct ovsdb_trigger *t, long long int now)
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{
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t->result = ovsdb_execute(t->session->db, t->session,
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t->request, now - t->created, &t->timeout_msec);
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if (t->result) {
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ovsdb_trigger_complete(t);
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return true;
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} else {
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return false;
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}
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}
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static void
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ovsdb_trigger_complete(struct ovsdb_trigger *t)
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{
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assert(t->result != NULL);
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list_remove(&t->node);
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list_push_back(&t->session->completions, &t->node);
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}
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