mirror of
https://github.com/MariaDB/server.git
synced 2025-01-17 12:32:27 +01:00
123 lines
3.7 KiB
C++
123 lines
3.7 KiB
C++
#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 "thread_registry.h"
|
|
|
|
#include <my_sys.h>
|
|
#include <my_list.h>
|
|
|
|
#if defined(__GNUC__) && defined(USE_PRAGMA_INTERFACE)
|
|
#pragma interface
|
|
#endif
|
|
|
|
class Instance;
|
|
class Instance_map;
|
|
class Thread_registry;
|
|
struct GUARD_NODE;
|
|
|
|
pthread_handler_t guardian(void *arg);
|
|
|
|
struct Guardian_thread_args
|
|
{
|
|
Thread_registry &thread_registry;
|
|
Instance_map *instance_map;
|
|
int 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:
|
|
/* states of an instance */
|
|
enum enum_instance_state { NOT_STARTED= 1, STARTING, STARTED, JUST_CRASHED,
|
|
CRASHED, CRASHED_AND_ABANDONED, STOPPING };
|
|
|
|
/*
|
|
The Guardian list node structure. Guardian utilizes it to store
|
|
guarded instances plus some additional info.
|
|
*/
|
|
|
|
struct GUARD_NODE
|
|
{
|
|
Instance *instance;
|
|
/* state of an instance (i.e. STARTED, CRASHED, etc.) */
|
|
enum_instance_state state;
|
|
/* the amount of attemts to restart instance (cleaned up at success) */
|
|
int restart_counter;
|
|
/* triggered at a crash */
|
|
time_t crash_moment;
|
|
/* General time field. Used to provide timeouts (at shutdown and restart) */
|
|
time_t last_checked;
|
|
};
|
|
|
|
|
|
Guardian_thread(Thread_registry &thread_registry_arg,
|
|
Instance_map *instance_map_arg,
|
|
uint monitoring_interval_arg);
|
|
~Guardian_thread();
|
|
/* Main funtion of the thread */
|
|
void run();
|
|
/* Initialize or refresh the list of guarded instances */
|
|
int init();
|
|
/* Request guardian shutdown. Stop instances if needed */
|
|
void request_shutdown(bool stop_instances);
|
|
/* Start instance protection */
|
|
int guard(Instance *instance, bool nolock= FALSE);
|
|
/* Stop instance protection */
|
|
int stop_guard(Instance *instance);
|
|
/* Returns true if guardian thread is stopped */
|
|
int is_stopped();
|
|
void lock();
|
|
void unlock();
|
|
|
|
public:
|
|
pthread_cond_t COND_guardian;
|
|
|
|
private:
|
|
/* Prepares Guardian shutdown. Stops instances is needed */
|
|
int stop_instances(bool stop_instances_arg);
|
|
/* check instance state and act accordingly */
|
|
void process_instance(Instance *instance, GUARD_NODE *current_node,
|
|
LIST **guarded_instances, LIST *elem);
|
|
int stopped;
|
|
|
|
private:
|
|
pthread_mutex_t LOCK_guardian;
|
|
Thread_info thread_info;
|
|
LIST *guarded_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_requested;
|
|
};
|
|
|
|
#endif /* INCLUDES_MYSQL_INSTANCE_MANAGER_GUARDIAN_H */
|