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#ifndef INCLUDES_MYSQL_INSTANCE_MANAGER_GUARDIAN_H
#define INCLUDES_MYSQL_INSTANCE_MANAGER_GUARDIAN_H
/* Copyright (C) 2004 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include <my_global.h>
#include <my_sys.h>
#include <my_list.h>
#ifdef __GNUC__
#pragma interface
#endif
class Instance;
class Instance_map;
#include "thread_registry.h"
#include "instance.h"
C_MODE_START
pthread_handler_decl(guardian, arg);
C_MODE_END
typedef struct st_guard_node
{
Instance *instance;
uint restart_counter;
time_t crash_moment;
} GUARD_NODE;
struct Guardian_thread_args
{
Thread_registry &thread_registry;
Instance_map *instance_map;
uint monitoring_interval;
Guardian_thread_args(Thread_registry &thread_registry_arg,
Instance_map *instance_map_arg,
uint monitoring_interval_arg) :
thread_registry(thread_registry_arg),
instance_map(instance_map_arg),
monitoring_interval(monitoring_interval_arg)
{}
};
/*
The guardian thread is responsible for monitoring and restarting of guarded
instances.
*/
class Guardian_thread: public Guardian_thread_args
{
public:
Guardian_thread(Thread_registry &thread_registry_arg,
Instance_map *instance_map_arg,
uint monitoring_interval_arg);
~Guardian_thread();
void run();
int init();
int start();
void shutdown();
void request_stop_instances();
int guard(Instance *instance);
int stop_guard(Instance *instance);
bool is_stopped;
public:
pthread_cond_t COND_guardian;
private:
int stop_instances();
int add_instance_to_list(Instance *instance, LIST **list);
void move_to_list(LIST **from, LIST **to);
private:
pthread_mutex_t LOCK_guardian;
Thread_info thread_info;
LIST *guarded_instances;
LIST *starting_instances;
MEM_ROOT alloc;
enum { MEM_ROOT_BLOCK_SIZE= 512 };
/* this variable is set to TRUE when we want to stop Guardian thread */
bool shutdown_guardian;
/*
This var is usually set together with shutdown_guardian. this way we
request guardian to shut down all instances before termination
*/
bool request_stop;
};
#endif /* INCLUDES_MYSQL_INSTANCE_MANAGER_GUARDIAN_H */
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