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#ifndef _EVENT_QUEUE_H_ #define _EVENT_QUEUE_H_ /* Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved. 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */ /** @addtogroup Event_Scheduler @{ @file event_queue.h Queue of events awaiting execution. */ #ifdef HAVE_PSI_INTERFACE extern PSI_mutex_key key_LOCK_event_queue; extern PSI_cond_key key_COND_queue_state; #endif /* HAVE_PSI_INTERFACE */ #include "queues.h" // QUEUE #include "sql_string.h" /* LEX_CSTRING */ #include "my_time.h" /* my_time_t, interval_type */ 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, const LEX_CSTRING *dbname, const LEX_CSTRING *name, Event_queue_element *new_element); void drop_event(THD *thd, const LEX_CSTRING *dbname, const LEX_CSTRING *name); void drop_schema_events(THD *thd, const LEX_CSTRING *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 PSI_stage_info *stage, const char *src_func, const char *src_file, uint src_line); void find_n_remove_event(const LEX_CSTRING *db, const LEX_CSTRING *name); void drop_matching_events(THD *thd, const LEX_CSTRING *pattern, bool (*)(const LEX_CSTRING*, Event_basic *)); void dbug_dump_queue(my_time_t now); /* LOCK_event_queue is the mutex which protects the access to the queue. */ mysql_mutex_t LOCK_event_queue; mysql_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_ */