Merge ahristov@bk-internal.mysql.com:/home/bk/mysql-5.1-new

into lmy004.:/work/mysql-5.1-bug16406

mysql-test/r/events_stress.result

+CREATE DATABASE IF NOT EXISTS events_test;
+CREATE DATABASE events_test2;
+USE events_test2;
+CREATE EVENT ev_drop1 ON SCHEDULE EVERY 10 MINUTE DISABLE DO SELECT 1;
+CREATE EVENT ev_drop2 ON SCHEDULE EVERY 10 MINUTE DISABLE DO SELECT 1;
+CREATE EVENT ev_drop3 ON SCHEDULE EVERY 10 MINUTE DISABLE DO SELECT 1;
+USE events_test;
+SELECT COUNT(*) FROM INFORMATION_SCHEMA.EVENTS WHERE EVENT_SCHEMA='events_test2';
+COUNT(*)
+3
+DROP DATABASE events_test2;
+SELECT COUNT(*) FROM INFORMATION_SCHEMA.EVENTS WHERE EVENT_SCHEMA='events_test2';
+COUNT(*)
+0
+"Now testing stability - dropping db -> events while they are running"
+CREATE DATABASE events_test2;
+USE events_test2;
+SELECT COUNT(*) FROM INFORMATION_SCHEMA.EVENTS WHERE EVENT_SCHEMA='events_test2';
+COUNT(*)
+1000
+SET GLOBAL event_scheduler=1;
+DROP DATABASE events_test2;
+SET GLOBAL event_scheduler=0;
+SELECT COUNT(*) FROM INFORMATION_SCHEMA.EVENTS WHERE EVENT_SCHEMA='events_test2';
+COUNT(*)
+0
+CREATE DATABASE events_test3;
+USE events_test3;
+SELECT COUNT(*) FROM INFORMATION_SCHEMA.EVENTS WHERE EVENT_SCHEMA='events_test3';
+COUNT(*)
+950
+CREATE DATABASE events_test4;
+USE events_test4;
+CREATE DATABASE events_test2;
+USE events_test2;
+SELECT COUNT(*) FROM INFORMATION_SCHEMA.EVENTS WHERE EVENT_SCHEMA='events_test2';
+COUNT(*)
+1050
+DROP DATABASE events_test2;
+SET GLOBAL event_scheduler=0;
+DROP DATABASE events_test3;
+SET GLOBAL event_scheduler=1;
+DROP DATABASE events_test4;
+SET GLOBAL event_scheduler=1;
+USE events_test;
+DROP DATABASE events_test;

mysql-test/t/events.test

@@ -274,7 +274,6 @@ drop event one_event;
 
 --echo "Sleep a bit so the server closes the second connection"
 --sleep 2
-
 create event e_26 on schedule at '2017-01-01 00:00:00' disable do set @a = 5;
 select db, name, body, definer, convert_tz(execute_at, 'UTC', 'SYSTEM'), on_completion from mysql.event;
 drop event e_26;

mysql-test/t/events_stress.test

+CREATE DATABASE IF NOT EXISTS events_test;
+#
+# DROP DATABASE test start (bug #16406)
+#
+CREATE DATABASE events_test2;
+USE events_test2;
+CREATE EVENT ev_drop1 ON SCHEDULE EVERY 10 MINUTE DISABLE DO SELECT 1;
+CREATE EVENT ev_drop2 ON SCHEDULE EVERY 10 MINUTE DISABLE DO SELECT 1;
+CREATE EVENT ev_drop3 ON SCHEDULE EVERY 10 MINUTE DISABLE DO SELECT 1;
+USE events_test;
+SELECT COUNT(*) FROM INFORMATION_SCHEMA.EVENTS WHERE EVENT_SCHEMA='events_test2';
+DROP DATABASE events_test2;
+SELECT COUNT(*) FROM INFORMATION_SCHEMA.EVENTS WHERE EVENT_SCHEMA='events_test2';
+
+--echo "Now testing stability - dropping db -> events while they are running"
+CREATE DATABASE events_test2;
+USE events_test2;
+--disable_query_log
+let $1= 1000;
+while ($1)
+{
+  eval CREATE EVENT ev_drop$1 ON SCHEDULE EVERY 1 SECOND DO SELECT $1;
+  dec $1;
+}
+--enable_query_log
+SELECT COUNT(*) FROM INFORMATION_SCHEMA.EVENTS WHERE EVENT_SCHEMA='events_test2';
+SET GLOBAL event_scheduler=1;
+--sleep 4
+DROP DATABASE events_test2;
+
+SET GLOBAL event_scheduler=0;
+--sleep 2
+SELECT COUNT(*) FROM INFORMATION_SCHEMA.EVENTS WHERE EVENT_SCHEMA='events_test2';
+CREATE DATABASE events_test3;
+USE events_test3;
+--disable_query_log
+let $1= 950;
+while ($1)
+{
+  eval CREATE EVENT ev_drop$1 ON SCHEDULE EVERY 1 SECOND DO SELECT $1;
+  dec $1;
+}
+--enable_query_log
+SELECT COUNT(*) FROM INFORMATION_SCHEMA.EVENTS WHERE EVENT_SCHEMA='events_test3';
+--sleep 3
+CREATE DATABASE events_test4;
+USE events_test4;
+--disable_query_log
+let $1= 860;
+while ($1)
+{
+  eval CREATE EVENT ev_drop$1 ON SCHEDULE EVERY 1 SECOND DO SELECT $1;
+  dec $1;
+}
+--enable_query_log
+
+
+CREATE DATABASE events_test2;
+USE events_test2;
+--disable_query_log
+let $1= 1050;
+while ($1)
+{
+  eval CREATE EVENT ev_drop$1 ON SCHEDULE EVERY 1 SECOND DO SELECT $1;
+  dec $1;
+}
+--enable_query_log
+SELECT COUNT(*) FROM INFORMATION_SCHEMA.EVENTS WHERE EVENT_SCHEMA='events_test2';
+--sleep 6
+DROP DATABASE events_test2;
+SET GLOBAL event_scheduler=0;
+DROP DATABASE events_test3;
+SET GLOBAL event_scheduler=1;
+DROP DATABASE events_test4;
+SET GLOBAL event_scheduler=1;
+USE events_test;
+#
+# DROP DATABASE test end (bug #16406)
+#
+DROP DATABASE events_test;

sql/event.cc

@@ -514,6 +514,28 @@ evex_open_event_table(THD *thd, enum thr_lock_type lock_type, TABLE **table)
 
   SYNOPSIS
     evex_db_find_event_aux()
+      thd    Thread context
+      et     evet_timed object containing dbname, name & definer
+      table  TABLE object for open mysql.event table.
+
+  RETURN VALUE
+    0                  - Routine found
+    EVEX_KEY_NOT_FOUND - No routine with given name
+*/
+
+inline int
+evex_db_find_event_aux(THD *thd, event_timed *et, TABLE *table)
+{
+  return evex_db_find_event_by_name(thd, et->dbname, et->name,
+                                    et->definer, table);
+}
+
+
+/*
+  Find row in open mysql.event table representing event
+
+  SYNOPSIS
+    evex_db_find_event_by_name()
       thd    Thread context
       dbname Name of event's database
       rname  Name of the event inside the db  
@@ -525,13 +547,13 @@ evex_open_event_table(THD *thd, enum thr_lock_type lock_type, TABLE **table)
 */
 
 int
-evex_db_find_event_aux(THD *thd, const LEX_STRING dbname,
+evex_db_find_event_by_name(THD *thd, const LEX_STRING dbname,
                           const LEX_STRING ev_name,
                           const LEX_STRING user_name,
                           TABLE *table)
 {
   byte key[MAX_KEY_LENGTH];
-  DBUG_ENTER("evex_db_find_event_aux");
+  DBUG_ENTER("evex_db_find_event_by_name");
   DBUG_PRINT("enter", ("name: %.*s", ev_name.length, ev_name.str));
 
   /*
@@ -710,7 +732,7 @@ db_create_event(THD *thd, event_timed *et, my_bool create_if_not,
   }
   
   DBUG_PRINT("info", ("check existance of an event with the same name"));
-  if (!evex_db_find_event_aux(thd, et->dbname, et->name, et->definer, table))
+  if (!evex_db_find_event_aux(thd, et, table))
   {
     if (create_if_not)
     {
@@ -848,7 +870,7 @@ db_update_event(THD *thd, event_timed *et, sp_name *new_name)
       goto err;    
     }
   
-    if (!evex_db_find_event_aux(thd, new_name->m_db, new_name->m_name,
+    if (!evex_db_find_event_by_name(thd, new_name->m_db, new_name->m_name,
                                 et->definer, table))
     {
       my_error(ER_EVENT_ALREADY_EXISTS, MYF(0), new_name->m_name.str);
@@ -861,8 +883,7 @@ db_update_event(THD *thd, event_timed *et, sp_name *new_name)
     overwrite the key and SE will tell us that it cannot find the already found
     row (copied into record[1] later
   */
-  if (EVEX_KEY_NOT_FOUND == evex_db_find_event_aux(thd, et->dbname, et->name,
-                                                   et->definer, table))
+  if (EVEX_KEY_NOT_FOUND == evex_db_find_event_aux(thd, et, table))
   {
     my_error(ER_EVENT_DOES_NOT_EXIST, MYF(0), et->name.str);
     goto err;    
@@ -943,7 +964,7 @@ db_find_event(THD *thd, sp_name *name, LEX_STRING *definer, event_timed **ett,
     goto done;
   }
 
-  if ((ret= evex_db_find_event_aux(thd, name->m_db, name->m_name, *definer,
+  if ((ret= evex_db_find_event_by_name(thd, name->m_db, name->m_name, *definer,
                                        table)))
   {
     my_error(ER_EVENT_DOES_NOT_EXIST, MYF(0), name->m_name.str);
@@ -1089,7 +1110,7 @@ evex_remove_from_cache(LEX_STRING *db, LEX_STRING *name, bool use_lock,
     if (!sortcmp_lex_string(*name, et->name, system_charset_info) &&
         !sortcmp_lex_string(*db, et->dbname, system_charset_info))
     {
-      if (!et->is_running())
+      if (et->can_spawn_now())
       {
         DBUG_PRINT("evex_remove_from_cache", ("not running - free and delete"));
         et->free_sp();
@@ -1393,3 +1414,187 @@ evex_show_create_event(THD *thd, sp_name *spn, LEX_STRING definer)
   
   DBUG_RETURN(ret);
 }
+
+
+/*
+  evex_drop_db_events - Drops all events in the selected database
+  
+  thd  - Thread
+  db   - ASCIIZ the name of the database
+  
+  Returns:
+    0  - OK
+    1  - Failed to delete a specific row
+    2  - Got NULL while reading db name from a row
+
+  Note:
+    The algo is the following
+    1. Go through the in-memory cache, if the scheduler is working
+       and for every event whose dbname matches the database we drop
+       check whether is currently in execution:
+       - event_timed::can_spawn() returns true -> the event is not
+         being executed in a child thread. The reason not to use
+         event_timed::is_running() is that the latter shows only if
+         it is being executed, which is 99% of the time in the thread
+         but there are some initiliazations before and after the
+         anonymous SP is being called. So if we delete in this moment
+         -=> *boom*, so we have to check whether the thread has been
+         spawned and can_spawn() is the right method.
+       - event_timed::can_spawn() returns false -> being runned ATM
+         just set the flags so it should drop itself.
+
+*/
+
+int
+evex_drop_db_events(THD *thd, char *db)
+{
+  TABLE *table;
+  READ_RECORD read_record_info;
+  MYSQL_LOCK *lock;
+  int ret= 0;
+  int i;
+  LEX_STRING db_lex= {db, strlen(db)};
+  
+  DBUG_ENTER("evex_drop_db_events");  
+  DBUG_PRINT("info",("dropping events from %s", db));
+
+
+  VOID(pthread_mutex_lock(&LOCK_event_arrays));
+
+  if ((ret= evex_open_event_table(thd, TL_WRITE, &table)))
+  {
+    sql_print_error("Table mysql.event is damaged.");
+    VOID(pthread_mutex_unlock(&LOCK_event_arrays));
+    DBUG_RETURN(SP_OPEN_TABLE_FAILED);
+  }
+
+  DBUG_PRINT("info",("%d elements in the queue",
+             evex_queue_num_elements(EVEX_EQ_NAME)));
+  VOID(pthread_mutex_lock(&LOCK_evex_running));
+  if (!evex_is_running)
+    goto skip_memory;
+
+  for (i= 0; i < evex_queue_num_elements(EVEX_EQ_NAME); ++i)
+  {
+    event_timed *et= evex_queue_element(&EVEX_EQ_NAME, i, event_timed*);
+    if (sortcmp_lex_string(et->dbname, db_lex, system_charset_info))
+      continue;
+
+    if (et->can_spawn_now_n_lock(thd))
+    {
+      DBUG_PRINT("info",("event %s not running - direct delete", et->name.str));
+      if (!(ret= evex_db_find_event_aux(thd, et, table)))
+      {
+        DBUG_PRINT("info",("event %s found on disk", et->name.str));
+        if ((ret= table->file->ha_delete_row(table->record[0])))
+        {
+          sql_print_error("Error while deleting a row - dropping "
+                          "a database. Skipping the rest.");
+          my_error(ER_EVENT_DROP_FAILED, MYF(0), et->name.str);
+          goto end;
+        }
+        DBUG_PRINT("info",("deleted event [%s] num [%d]. Time to free mem",
+                   et->name.str, i));
+      }
+      else if (ret == EVEX_KEY_NOT_FOUND)
+      {
+        sql_print_error("Expected to find event %s.%s of %s on disk-not there.",
+                         et->dbname.str, et->name.str, et->definer.str);
+      }
+      et->free_sp();
+      delete et;
+      et= 0;
+      /* no need to call et->spawn_unlock because we already cleaned et */
+    }
+    else
+    {
+      DBUG_PRINT("info",("event %s is running. setting exec_no_more and dropped",
+                  et->name.str));
+      et->flags|= EVENT_EXEC_NO_MORE;
+      et->dropped= TRUE;
+    }
+    DBUG_PRINT("info",("%d elements in the queue",
+               evex_queue_num_elements(EVEX_EQ_NAME)));
+    evex_queue_delete_element(&EVEX_EQ_NAME, i);// 1 is top
+    DBUG_PRINT("info",("%d elements in the queue",
+               evex_queue_num_elements(EVEX_EQ_NAME)));
+    /*
+      decrease so we start at the same position, there will be
+      less elements in the queue, it will still be ordered so on
+      next iteration it will be again i the current element or if
+      no more we finish.
+    */
+    --i;
+  }
+
+skip_memory:
+  /*
+   The reasoning behind having two loops is the following:
+   If there was only one loop, the table-scan, then for every element which
+   matches, the queue in memory has to be searched to remove the element.
+   While if we go first over the queue and remove what's in there we have only
+   one pass over it and after finishing it, moving to table-scan for the disabled
+   events. This needs quite less time and means quite less locking on
+   LOCK_event_arrays.
+  */
+  DBUG_PRINT("info",("Mem-cache checked, now going to db for disabled events"));
+  /* only enabled events are in memory, so we go now and delete the rest */
+  init_read_record(&read_record_info, thd, table ,NULL,1,0);
+  while (!(read_record_info.read_record(&read_record_info)) && !ret)
+  {
+    char *et_db;
+
+    if ((et_db= get_field(thd->mem_root, table->field[EVEX_FIELD_DB])) == NULL)
+    {
+      ret= 2;
+      break;
+    }
+    
+    LEX_STRING et_db_lex= {et_db, strlen(et_db)};
+    if (!sortcmp_lex_string(et_db_lex, db_lex, system_charset_info))
+    {
+      event_timed ett;
+      char *ptr;
+      
+      if ((ptr= get_field(thd->mem_root, table->field[EVEX_FIELD_STATUS]))
+           == NullS)
+      {
+        sql_print_error("Error while loading from mysql.event. "
+                        "Table probably corrupted");
+        goto end;
+      }
+      /*
+        When not running nothing is in memory so we have to clean
+        everything.
+        We don't delete EVENT_ENABLED events when the scheduler is running
+        because maybe this is an event which we asked to drop itself when
+        it is finished and it hasn't finished yet, so we don't touch it.
+        It will drop itself. The not running ENABLED events has been already
+        deleted from ha_delete_row() above in the loop over the QUEUE
+        (in case the executor is running).
+        'D' stands for DISABLED, 'E' for ENABLED - it's an enum
+      */
+      if ((evex_is_running && ptr[0] == 'D') || !evex_is_running)
+      {
+        DBUG_PRINT("info", ("Dropping %s.%s", et_db, ett.name.str));
+        if ((ret= table->file->ha_delete_row(table->record[0])))
+        {
+          my_error(ER_EVENT_DROP_FAILED, MYF(0), ett.name.str);
+          goto end;
+        }
+      }
+    }
+  }
+  DBUG_PRINT("info",("Disk checked for disabled events. Finishing."));
+
+end:
+  VOID(pthread_mutex_unlock(&LOCK_evex_running));
+  VOID(pthread_mutex_unlock(&LOCK_event_arrays));
+  end_read_record(&read_record_info);
+
+  thd->version--;  // Force close to free memory
+
+  close_thread_tables(thd);
+
+  DBUG_RETURN(ret);
+}

sql/event.h

@@ -79,6 +79,8 @@ class event_timed
 {
   event_timed(const event_timed &);	/* Prevent use of these */
   void operator=(event_timed &);
+  my_bool in_spawned_thread;
+  ulong locked_by_thread_id;
   my_bool running;
   pthread_mutex_t LOCK_running;
 
@@ -117,12 +119,13 @@ class event_timed
   bool free_sphead_on_delete;
   uint flags;//all kind of purposes
 
-  event_timed():running(0), status_changed(false), last_executed_changed(false),
-                expression(0), created(0), modified(0),
-                on_completion(MYSQL_EVENT_ON_COMPLETION_DROP),
+  event_timed():in_spawned_thread(0),locked_by_thread_id(0),
+                running(0), status_changed(false),
+                last_executed_changed(false), expression(0), created(0),
+                modified(0), on_completion(MYSQL_EVENT_ON_COMPLETION_DROP),
                 status(MYSQL_EVENT_ENABLED), sphead(0), sql_mode(0), 
-                body_begin(0), dropped(false), free_sphead_on_delete(true),
-                flags(0)
+                body_begin(0), dropped(false),
+                free_sphead_on_delete(true), flags(0)
                 
   {
     pthread_mutex_init(&this->LOCK_running, MY_MUTEX_INIT_FAST);
@@ -200,7 +203,44 @@ class event_timed
     return ret;
   }
 
-  void free_sp()
+  /*
+    Checks whether the object is being used in a spawned thread.
+    This method is for very basic checking. Use ::can_spawn_now_n_lock()
+    for most of the cases.
+  */
+
+  my_bool
+  can_spawn_now()
+  {
+    my_bool ret;
+    VOID(pthread_mutex_lock(&this->LOCK_running));
+    ret= !in_spawned_thread;
+    VOID(pthread_mutex_unlock(&this->LOCK_running));
+    return ret;  
+  }
+
+  /*
+    Checks whether this thread can lock the object for modification ->
+    preventing being spawned for execution, and locks if possible.
+    use ::can_spawn_now() only for basic checking because a race
+    condition may occur between the check and eventual modification (deletion)
+    of the object.
+  */
+
+  my_bool
+  can_spawn_now_n_lock(THD *thd);
+
+  int
+  spawn_unlock(THD *thd);
+
+  int
+  spawn_now(void * (*thread_func)(void*));
+  
+  void
+  spawn_thread_finish(THD *thd);
+  
+  void
+  free_sp()
   {
     delete sphead;
     sphead= 0;
@@ -239,6 +279,10 @@ event_reconstruct_interval_expression(String *buf,
                                       interval_type interval,
                                       longlong expression);
 
+int
+evex_drop_db_events(THD *thd, char *db);
+
+
 int
 init_events();
 

sql/event_priv.h

@@ -19,6 +19,10 @@
 #include "mysql_priv.h"
 
 
+#define EVENT_EXEC_STARTED      0
+#define EVENT_EXEC_ALREADY_EXEC 1
+#define EVENT_EXEC_CANT_FORK    2
+
 #define EVEX_USE_QUEUE
 
 #define UNLOCK_MUTEX_AND_BAIL_OUT(__mutex, __label) \
@@ -32,9 +36,9 @@ int
 my_time_compare(TIME *a, TIME *b);
 
 int
-evex_db_find_event_aux(THD *thd, const LEX_STRING dbname,
-                       const LEX_STRING rname,
-                       const LEX_STRING definer,
+evex_db_find_event_by_name(THD *thd, const LEX_STRING dbname,
+                          const LEX_STRING ev_name,
+                          const LEX_STRING user_name,
                           TABLE *table);
 
 int

sql/event_timed.cc

@@ -908,7 +908,7 @@ event_timed::drop(THD *thd)
   Saves status and last_executed_at to the disk if changed.
 
   SYNOPSIS
-    event_timed::drop()
+    event_timed::update_fields()
       thd - thread context
 
   RETURN VALUE
@@ -945,7 +945,7 @@ event_timed::update_fields(THD *thd)
   }
 
 
-  if ((ret= evex_db_find_event_aux(thd, dbname, name, definer, table)))
+  if ((ret= evex_db_find_event_by_name(thd, dbname, name, definer, table)))
     goto done;
 
   store_record(table,record[1]);
@@ -1204,6 +1204,7 @@ event_timed::compile(THD *thd, MEM_ROOT *mem_root)
   MEM_ROOT *tmp_mem_root= 0;
   LEX *old_lex= thd->lex, lex;
   char *old_db;
+  int old_db_length;
   event_timed *ett;
   sp_name *spn;
   char *old_query;
@@ -1237,7 +1238,9 @@ event_timed::compile(THD *thd, MEM_ROOT *mem_root)
   old_query_len= thd->query_length;
   old_query= thd->query;
   old_db= thd->db;
+  old_db_length= thd->db_length;
   thd->db= dbname.str;
+  thd->db_length= dbname.length;
 
   get_create_event(thd, &show_create);
 
@@ -1303,3 +1306,135 @@ event_timed::compile(THD *thd, MEM_ROOT *mem_root)
   DBUG_RETURN(ret);
 }
 
+
+/*
+  Checks whether this thread can lock the object for modification ->
+  preventing being spawned for execution, and locks if possible.
+  use ::can_spawn_now() only for basic checking because a race
+  condition may occur between the check and eventual modification (deletion)
+  of the object.
+
+  Returns
+    true  - locked
+    false - cannot lock
+*/
+
+my_bool
+event_timed::can_spawn_now_n_lock(THD *thd)
+{
+  my_bool ret= FALSE;
+  VOID(pthread_mutex_lock(&this->LOCK_running));
+  if (!in_spawned_thread)
+  {
+    in_spawned_thread= TRUE;
+    ret= TRUE;
+    locked_by_thread_id= thd->thread_id;
+  }
+  VOID(pthread_mutex_unlock(&this->LOCK_running));
+  return ret;  
+}
+
+
+extern pthread_attr_t connection_attrib;
+
+/*
+  Checks whether is possible and forks a thread. Passes self as argument.
+  
+  Returns
+  EVENT_EXEC_STARTED       - OK
+  EVENT_EXEC_ALREADY_EXEC  - Thread not forked, already working
+  EVENT_EXEC_CANT_FORK     - Unable to spawn thread (error)
+*/
+
+int
+event_timed::spawn_now(void * (*thread_func)(void*))
+{  
+  int ret= EVENT_EXEC_STARTED;
+  static uint exec_num= 0;
+  DBUG_ENTER("event_timed::spawn_now");
+  DBUG_PRINT("info", ("[%s.%s]", dbname.str, name.str));
+
+  VOID(pthread_mutex_lock(&this->LOCK_running));
+  if (!in_spawned_thread)
+  {
+    pthread_t th;
+    in_spawned_thread= true;
+    if (pthread_create(&th, &connection_attrib, thread_func, (void*)this))
+    {
+      DBUG_PRINT("info", ("problem while spawning thread"));
+      ret= EVENT_EXEC_CANT_FORK;
+      in_spawned_thread= false;
+    }
+#ifndef DBUG_OFF
+    else
+    {
+      sql_print_information("SCHEDULER: Started thread %d", ++exec_num);
+      DBUG_PRINT("info", ("thread spawned"));
+    }
+#endif
+  }
+  else
+  {
+    DBUG_PRINT("info", ("already in spawned thread. skipping"));
+    ret= EVENT_EXEC_ALREADY_EXEC;
+  }
+  VOID(pthread_mutex_unlock(&this->LOCK_running));
+
+  DBUG_RETURN(ret);  
+}
+
+
+void
+event_timed::spawn_thread_finish(THD *thd)
+{
+  DBUG_ENTER("event_timed::spawn_thread_finish");
+  VOID(pthread_mutex_lock(&this->LOCK_running));
+  in_spawned_thread= false;
+  if ((flags & EVENT_EXEC_NO_MORE) || status == MYSQL_EVENT_DISABLED)
+  {
+    DBUG_PRINT("info", ("%s exec no more. to drop=%d", name.str, dropped));
+    if (dropped)
+      drop(thd);
+    VOID(pthread_mutex_unlock(&this->LOCK_running));
+    delete this;
+    DBUG_VOID_RETURN;
+  }
+  VOID(pthread_mutex_unlock(&this->LOCK_running));
+  DBUG_VOID_RETURN;
+}
+
+
+/*
+  Unlocks the object after it has been locked with ::can_spawn_now_n_lock()
+
+  Returns
+    0 - ok
+    1 - not locked by this thread
+  
+*/
+ 
+
+int
+event_timed::spawn_unlock(THD *thd)
+{
+  int ret= 0;
+  VOID(pthread_mutex_lock(&this->LOCK_running));
+  if (!in_spawned_thread)
+  {
+    if (locked_by_thread_id == thd->thread_id)
+    {        
+      in_spawned_thread= FALSE;
+      locked_by_thread_id= 0;
+    }
+    else
+    {
+      sql_print_error("A thread tries to unlock when he hasn't locked. "
+                      "thread_id=%ld locked by %ld",
+                      thd->thread_id, locked_by_thread_id);
+      DBUG_ASSERT(0);
+      ret= 1;
+    }
+  }
+  VOID(pthread_mutex_unlock(&this->LOCK_running));
+  return ret;  
+}

sql/sql_db.cc

@@ -20,6 +20,7 @@
 #include "mysql_priv.h"
 #include <mysys_err.h>
 #include "sp.h"
+#include "event.h"
 #include <my_dir.h>
 #include <m_ctype.h>
 #ifdef __WIN__
@@ -870,6 +871,7 @@ bool mysql_rm_db(THD *thd,char *db,bool if_exists, bool silent)
 
 exit:
   (void)sp_drop_db_routines(thd, db); /* QQ Ignore errors for now  */
+  (void)evex_drop_db_events(thd, db); /* QQ Ignore errors for now  */
   start_waiting_global_read_lock(thd);
   /*
     If this database was the client's selected database, we silently change the