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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 Event_queue;
class Event_job_data;
class Event_scheduler
{
public:
Event_scheduler(){}
~Event_scheduler(){}
enum enum_state
{
INITIALIZED = 0,
RUNNING,
STOPPING
};
/* State changing methods follow */
bool
start();
bool
stop();
/*
Need to be public because has to be called from the function
passed to pthread_create.
*/
bool
run(THD *thd);
bool
init_scheduler(Event_queue *queue);
void
deinit_scheduler();
void
init_mutexes();
void
deinit_mutexes();
/* Information retrieving methods follow */
enum enum_state
get_state();
void
queue_changed();
bool
dump_internal_status(THD *thd);
private:
uint
workers_count();
/* helper functions */
bool
execute_top(THD *thd, Event_job_data *job_data);
/* helper functions for working with mutexes & conditionals */
void
lock_data(const char *func, uint line);
void
unlock_data(const char *func, uint line);
void
cond_wait(struct timespec *abstime, const char *func, uint line);
pthread_mutex_t LOCK_scheduler_state;
/* This is the current status of the life-cycle of the scheduler. */
enum enum_state state;
/*
Holds the thread id of the executor thread or 0 if the scheduler 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;
pthread_cond_t COND_state;
Event_queue *queue;
uint mutex_last_locked_at_line;
uint mutex_last_unlocked_at_line;
const char* mutex_last_locked_in_func;
const char* mutex_last_unlocked_in_func;
bool mutex_scheduler_data_locked;
bool waiting_on_cond;
ulonglong started_events;
private:
/* Prevent use of these */
Event_scheduler(const Event_scheduler &);
void operator=(Event_scheduler &);
};
#endif /* _EVENT_SCHEDULER_H_ */
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