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.
57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
#pragma once
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#ifndef _MMMON_H
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#define _MMMON_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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#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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/**
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* @file mmmon.h - The Multi-Master monitor
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*/
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MXS_BEGIN_DECLS
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/**
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* The handle for an instance of a Multi-Master 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 detectStaleMaster; /**< Monitor flag for Stale Master detection */
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MXS_MONITOR_SERVERS *master; /**< Master server for Master/Slave replication */
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char* script; /*< Script to call when state changes occur on servers */
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uint64_t events; /*< enabled events */
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MXS_MONITOR* monitor;
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} MM_MONITOR;
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MXS_END_DECLS
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#endif
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