event_scheduler.h

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#ifndef _EVENT_SCHEDULER_H_
#define _EVENT_SCHEDULER_H_
/* Copyright (c) 2004, 2025, Oracle and/or its affiliates.
 
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   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.
 
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   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
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   the program or referenced in the documentation.
 
   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, version 2.0, for more details.
 
   You should have received a copy of the GNU General Public License
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
/**
  @addtogroup Event_Scheduler
  @{
*/
/**
  @file
 
  Declarations of the scheduler thread class
  and related functionality.
 
  This file is internal to Event_Scheduler module. Please do not
  include it directly.  All public declarations of Event_Scheduler
  module are in events.h and event_data_objects.h.
*/
 
#include <sys/types.h>
 
#include "my_inttypes.h"
#include "mysql/components/services/bits/mysql_cond_bits.h"
#include "mysql/components/services/bits/mysql_mutex_bits.h"
#include "mysql/components/services/bits/psi_stage_bits.h"
 
class Event_db_repository;
class Event_job_data;
class Event_queue;
class Event_queue_element_for_exec;
class THD;
 
void pre_init_event_thread(THD *thd);
 
bool post_init_event_thread(THD *thd);
 
void deinit_event_thread(THD *thd);
 
class Event_worker_thread {
 public:
  void run(THD *thd, Event_queue_element_for_exec *event);
 
 private:
  void print_warnings(THD *thd, Event_job_data *et);
};
 
class Event_scheduler {
 public:
  Event_scheduler(Event_queue *event_queue_arg);
  ~Event_scheduler();
 
  /* State changing methods follow */
 
  bool start(int *err_no);
 
  bool stop();
 
  /*
    Need to be public because has to be called from the function
    passed to my_thread_create.
  */
  bool run(THD *thd);
 
  /* Information retrieving methods follow */
  bool is_running();
 
  void dump_internal_status();
 
 private:
  int workers_count();
 
  /* helper functions */
  bool execute_top(Event_queue_element_for_exec *event_name);
 
  /* 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 PSI_stage_info *stage, const char *src_func,
                 const char *src_file, uint src_line);
 
  mysql_mutex_t LOCK_scheduler_state;
 
  enum enum_state { INITIALIZED = 0, RUNNING, STOPPING };
 
  /* This is the current status of the life-cycle of the scheduler. */
  enum enum_state state;
 
  THD *scheduler_thd;
 
  mysql_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:
  // Disallow copy construction and assignment.
  Event_scheduler(const Event_scheduler &) = delete;
  void operator=(Event_scheduler &) = delete;
};
 
/**
  @} (End of group Event_Scheduler)
*/
 
#endif /* _EVENT_SCHEDULER_H_ */