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#ifndef _EVENT_QUEUE_H_
#define _EVENT_QUEUE_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; version 2 of the License.
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 */
/**
@addtogroup Event_Scheduler
@{
@file event_queue.h
Queue of events awaiting execution.
*/
class Event_basic;
class Event_queue_element;
class Event_queue_element_for_exec;
class THD;
/**
Queue of active events awaiting execution.
*/
class Event_queue
{
public:
Event_queue();
~Event_queue();
bool
init_queue(THD *thd);
/* Methods for queue management follow */
bool
create_event(THD *thd, Event_queue_element *new_element,
bool *created);
void
update_event(THD *thd, LEX_STRING dbname, LEX_STRING name,
Event_queue_element *new_element);
void
drop_event(THD *thd, LEX_STRING dbname, LEX_STRING name);
void
drop_schema_events(THD *thd, LEX_STRING schema);
void
recalculate_activation_times(THD *thd);
bool
get_top_for_execution_if_time(THD *thd,
Event_queue_element_for_exec **event_name);
void
dump_internal_status();
private:
void
empty_queue();
void
deinit_queue();
/* 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(THD *thd, struct timespec *abstime, const char* msg,
const char *func, uint line);
void
find_n_remove_event(LEX_STRING db, LEX_STRING name);
void
drop_matching_events(THD *thd, LEX_STRING pattern,
bool (*)(LEX_STRING, Event_basic *));
void
dbug_dump_queue(time_t now);
/* LOCK_event_queue is the mutex which protects the access to the queue. */
pthread_mutex_t LOCK_event_queue;
pthread_cond_t COND_queue_state;
/* The sorted queue with the Event_queue_element objects */
QUEUE queue;
my_time_t next_activation_at;
uint mutex_last_locked_at_line;
uint mutex_last_unlocked_at_line;
uint mutex_last_attempted_lock_at_line;
const char* mutex_last_locked_in_func;
const char* mutex_last_unlocked_in_func;
const char* mutex_last_attempted_lock_in_func;
bool mutex_queue_data_locked;
bool mutex_queue_data_attempting_lock;
bool waiting_on_cond;
};
/**
@} (End of group Event_Scheduler)
*/
#endif /* _EVENT_QUEUE_H_ */
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