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when there are no up-to-date system tables to support it: - initialize the scheduler before reporting "Ready for connections". This ensures that warnings, if any, are printed before "Ready for connections", and this message is not mangled. - do not abort the scheduler if there are no system tables - check the tables once at start up, remember the status and disable the scheduler if the tables are not up to date. If one attempts to use the scheduler with bad tables, issue an error message. - clean up the behaviour of the module under LOCK TABLES and pre-locking mode - make sure implicit commit of Events DDL works as expected. - add more tests Collateral clean ups in the events code. This patch fixes Bug#23631 Events: SHOW VARIABLES doesn't work when mysql.event is damaged
144 lines
2.9 KiB
C++
144 lines
2.9 KiB
C++
#ifndef _EVENT_SCHEDULER_H_
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#define _EVENT_SCHEDULER_H_
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/* Copyright (C) 2004-2006 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/**
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@file
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This file is internal to Events module. Please do not include it directly.
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All public declarations of Events module are in events.h and
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event_data_objects.h.
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*/
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class Event_queue;
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class Event_job_data;
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class Event_db_repository;
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class Events;
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void
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pre_init_event_thread(THD* thd);
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bool
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post_init_event_thread(THD* thd);
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void
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deinit_event_thread(THD *thd);
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class Event_worker_thread
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{
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public:
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static void
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init(Event_db_repository *db_repository_arg)
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{
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db_repository= db_repository_arg;
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}
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void
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run(THD *thd, Event_queue_element_for_exec *event);
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private:
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void
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print_warnings(THD *thd, Event_job_data *et);
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static Event_db_repository *db_repository;
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};
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class Event_scheduler
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{
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public:
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Event_scheduler(Event_queue *event_queue_arg);
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~Event_scheduler();
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/* State changing methods follow */
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bool
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start();
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bool
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stop();
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/*
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Need to be public because has to be called from the function
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passed to pthread_create.
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*/
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bool
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run(THD *thd);
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/* Information retrieving methods follow */
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bool
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is_running();
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void
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dump_internal_status();
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private:
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uint
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workers_count();
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/* helper functions */
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bool
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execute_top(Event_queue_element_for_exec *event_name);
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/* helper functions for working with mutexes & conditionals */
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void
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lock_data(const char *func, uint line);
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void
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unlock_data(const char *func, uint line);
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void
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cond_wait(THD *thd, struct timespec *abstime, const char* msg,
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const char *func, uint line);
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pthread_mutex_t LOCK_scheduler_state;
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enum enum_state
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{
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UNINITIALIZED = 0,
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INITIALIZED,
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RUNNING,
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STOPPING
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};
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/* This is the current status of the life-cycle of the scheduler. */
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enum enum_state state;
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THD *scheduler_thd;
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pthread_cond_t COND_state;
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Event_queue *queue;
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uint mutex_last_locked_at_line;
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uint mutex_last_unlocked_at_line;
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const char* mutex_last_locked_in_func;
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const char* mutex_last_unlocked_in_func;
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bool mutex_scheduler_data_locked;
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bool waiting_on_cond;
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ulonglong started_events;
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private:
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/* Prevent use of these */
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Event_scheduler(const Event_scheduler &);
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void operator=(Event_scheduler &);
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};
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#endif /* _EVENT_SCHEDULER_H_ */
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