b434c94563
If a monitor is started and stopped before the external monitoring thread has had time to start, a deadlock will occur. The first thing that the monitoring threads do is read the monitor handle from the monitor object. This handle is given as the return value of startMonitor and it is stored in the monitor object. As this can still be NULL when the monitor thread starts, the threads use locks to prevent this. The correct way to prevent this is to pass the handle as the thread parameter so that no locks are required.
104 lines
3.3 KiB
C
104 lines
3.3 KiB
C
#pragma once
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#ifndef _GALERAMON_H
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#define _GALERAMON_H
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/*
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* Copyright (c) 2016 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
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*
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* Change Date: 2019-07-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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/**
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* @file galeramon.h - The Galera cluster monitor
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*
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* @verbatim
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* Revision History
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*
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* Date Who Description
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* 07/05/15 Markus Makela Initial Implementation of galeramon.h
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* @endverbatim
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*/
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#include <maxscale/cdefs.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <maxscale/monitor.h>
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#include <maxscale/spinlock.h>
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#include <maxscale/thread.h>
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#include <mysql.h>
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#include <mysqld_error.h>
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#include <maxscale/log_manager.h>
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#include <maxscale/secrets.h>
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#include <maxscale/dcb.h>
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#include <maxscale/modinfo.h>
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#include <maxscale/config.h>
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#include <maxscale/hashtable.h>
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MXS_BEGIN_DECLS
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/**
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* Galera Variables and server reference for each
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* monitored node that could be part of cluster.
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*
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* This struct is added to the HASHTABLE *galera_nodes_info
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*/
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typedef struct galera_node_info
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{
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int joined; /**< The node claims to be "Synced" */
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int local_index; /**< wsrep_local_index Galera variable:
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* the node index vlaue in the cluster */
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int local_state; /**< wsrep_local_state Galera variable:
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* the node state in the cluster */
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int cluster_size; /**< wsrep_cluster_size Galera variable:
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* the cluster size the node sees */
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char *cluster_uuid; /**< wsrep_cluster_uuid Galera variable:
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* the cluster UUID the node sees */
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const SERVER *node; /**< The reference to nodes' SERVER struct */
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} GALERA_NODE_INFO;
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/**
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* Information of the current detected
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* Galera Cluster
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*/
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typedef struct galera_cluster_info
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{
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int c_size; /**< How many nodes in the cluster */
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char *c_uuid; /**< The Cluster UUID */
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} GALERA_CLUSTER_INFO;
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/**
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* The handle for an instance of a Galera Monitor module
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*/
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typedef struct
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{
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THREAD thread; /**< Monitor thread */
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int shutdown; /**< Flag to shutdown the monitor thread */
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int status; /**< Monitor status */
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unsigned long id; /**< Monitor ID */
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int disableMasterFailback; /**< Monitor flag for Galera Cluster Master failback */
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int availableWhenDonor; /**< Monitor flag for Galera Cluster Donor availability */
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bool disableMasterRoleSetting; /**< Monitor flag to disable setting master role */
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MXS_MONITOR_SERVERS *master; /**< Master server for MySQL Master/Slave replication */
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char* script;
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bool root_node_as_master; /**< Whether we require that the Master should
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* have a wsrep_local_index of 0 */
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bool use_priority; /*< Use server priorities */
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uint64_t events; /*< enabled events */
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bool set_donor_nodes; /**< set the wrep_sst_donor variable with an
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* ordered list of nodes */
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HASHTABLE *galera_nodes_info; /**< Contains Galera Cluster variables of all nodes */
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GALERA_CLUSTER_INFO cluster_info; /**< Contains Galera cluster info */
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MXS_MONITOR* monitor;
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} GALERA_MONITOR;
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MXS_END_DECLS
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#endif
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