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#ifndef _EVENT_SCHEDULER_H_
#define _EVENT_SCHEDULER_H_
/* Copyright (C) 2004-2006 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 */
class sp_name;
class Event_timed;
class Event_db_repository;
class THD;
int
events_init();
void
events_shutdown();
#include "event_queue.h"
#include "event_scheduler.h"
class Event_scheduler : public Event_queue
{
public:
enum enum_state
{
UNINITIALIZED= 0,
INITIALIZED,
COMMENCING,
CANTSTART,
RUNNING,
SUSPENDED,
IN_SHUTDOWN
};
enum enum_suspend_or_resume
{
SUSPEND= 1,
RESUME= 2
};
/* This is the current status of the life-cycle of the scheduler. */
enum enum_state state;
static void
create_instance();
/* Singleton access */
static Event_scheduler*
get_instance();
bool
init(Event_db_repository *db_repo);
void
destroy();
/* State changing methods follow */
bool
start();
int
stop();
bool
start_suspended();
/*
Need to be public because has to be called from the function
passed to pthread_create.
*/
bool
run(THD *thd);
int
suspend_or_resume(enum enum_suspend_or_resume action);
/*
static void
init_mutexes();
static void
destroy_mutexes();
*/
void
report_error_during_start();
/* Information retrieving methods follow */
enum enum_state
get_state();
bool
initialized();
static int
dump_internal_status(THD *thd);
/* helper functions for working with mutexes & conditionals */
void
lock_data(const char *func, uint line);
void
unlock_data(const char *func, uint line);
int
cond_wait(int cond, pthread_mutex_t *mutex);
void
queue_changed();
protected:
uint
workers_count();
/* helper functions */
bool
execute_top(THD *thd, Event_timed *et);
void
clean_memory(THD *thd);
void
stop_all_running_events(THD *thd);
bool
check_n_suspend_if_needed(THD *thd);
bool
check_n_wait_for_non_empty_queue(THD *thd);
/* Singleton DP is used */
Event_scheduler();
pthread_mutex_t *LOCK_scheduler_data;
/* Set to start the scheduler in suspended state */
bool start_scheduler_suspended;
/*
Holds the thread id of the executor thread or 0 if the executor is not
running. It is used by ::shutdown() to know which thread to kill with
kill_one_thread(). The latter wake ups a thread if it is waiting on a
conditional variable and sets thd->killed to non-zero.
*/
ulong thread_id;
enum enum_cond_vars
{
COND_NONE= -1,
COND_new_work= 0,
COND_started_or_stopped,
COND_suspend_or_resume,
/* Must be always last */
COND_LAST
};
uint mutex_last_locked_at_line_nr;
uint mutex_last_unlocked_at_line_nr;
const char* mutex_last_locked_in_func_name;
const char* mutex_last_unlocked_in_func_name;
int cond_waiting_on;
bool mutex_scheduler_data_locked;
static const char * const cond_vars_names[COND_LAST];
pthread_cond_t cond_vars[COND_LAST];
private:
/* Prevent use of these */
Event_scheduler(const Event_scheduler &);
void operator=(Event_scheduler &);
};
#endif /* _EVENT_SCHEDULER_H_ */
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