WL#3337 (Event scheduler new architecture)

event_scheduler_ng.cc/h is no more

1 files changed, 104 insertions, 0 deletions

diff --git a/sql/event_scheduler.h b/sql/event_scheduler.h
index acd0debe391..bf3e8e63e11 100644
--- a/sql/event_scheduler.h
+++ b/sql/event_scheduler.h
@@ -16,4 +16,108 @@
    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_ */