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128 lines
3.7 KiB
C++
128 lines
3.7 KiB
C++
#ifndef INCLUDES_MYSQL_INSTANCE_MANAGER_GUARDIAN_H
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#define INCLUDES_MYSQL_INSTANCE_MANAGER_GUARDIAN_H
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/* Copyright (C) 2004 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#include <my_global.h>
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#include "thread_registry.h"
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#include <my_sys.h>
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#include <my_list.h>
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#ifdef __GNUC__
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#pragma interface
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#endif
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class Instance;
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class Instance_map;
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class Thread_registry;
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struct GUARD_NODE;
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C_MODE_START
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pthread_handler_decl(guardian, arg);
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C_MODE_END
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struct Guardian_thread_args
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{
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Thread_registry &thread_registry;
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Instance_map *instance_map;
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int monitoring_interval;
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Guardian_thread_args(Thread_registry &thread_registry_arg,
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Instance_map *instance_map_arg,
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uint monitoring_interval_arg) :
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thread_registry(thread_registry_arg),
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instance_map(instance_map_arg),
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monitoring_interval(monitoring_interval_arg)
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{}
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};
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/*
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The guardian thread is responsible for monitoring and restarting of guarded
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instances.
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*/
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class Guardian_thread: public Guardian_thread_args
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{
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public:
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/* states of an instance */
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enum INSTANCE_STATE { NOT_STARTED= 1, STARTING, STARTED, JUST_CRASHED,
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CRASHED, CRASHED_AND_ABANDONED, STOPPING };
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/*
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The Guardian list node structure. Guardian utilizes it to store
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guarded instances plus some additional info.
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*/
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struct GUARD_NODE
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{
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Instance *instance;
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/* state of an instance (i.e. STARTED, CRASHED, etc.) */
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INSTANCE_STATE state;
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/* the amount of attemts to restart instance (cleaned up at success) */
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int restart_counter;
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/* triggered at a crash */
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time_t crash_moment;
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/* General time field. Used to provide timeouts (at shutdown and restart) */
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time_t last_checked;
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};
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Guardian_thread(Thread_registry &thread_registry_arg,
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Instance_map *instance_map_arg,
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uint monitoring_interval_arg);
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~Guardian_thread();
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/* Main funtion of the thread */
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void run();
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/* Initialize or refresh the list of guarded instances */
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int init();
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/* Request guardian shutdown. Stop instances if needed */
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void request_shutdown(bool stop_instances);
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/* Start instance protection */
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int guard(Instance *instance, bool nolock= FALSE);
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/* Stop instance protection */
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int stop_guard(Instance *instance);
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/* Returns true if guardian thread is stopped */
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int is_stopped();
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int lock();
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int unlock();
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public:
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pthread_cond_t COND_guardian;
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private:
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/* Prepares Guardian shutdown. Stops instances is needed */
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int stop_instances(bool stop_instances_arg);
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/* check instance state and act accordingly */
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void process_instance(Instance *instance, GUARD_NODE *current_node,
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LIST **guarded_instances, LIST *elem);
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int stopped;
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private:
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pthread_mutex_t LOCK_guardian;
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Thread_info thread_info;
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LIST *guarded_instances;
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MEM_ROOT alloc;
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enum { MEM_ROOT_BLOCK_SIZE= 512 };
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/* this variable is set to TRUE when we want to stop Guardian thread */
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bool shutdown_requested;
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};
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#endif /* INCLUDES_MYSQL_INSTANCE_MANAGER_GUARDIAN_H */
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