path: root/sql/sql_insert.cc

/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB

   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; either version 2 of the License, or
   (at your option) any later version.

   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, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */


/* Insert of records */

#include "mysql_priv.h"
#include "sql_acl.h"

static int check_null_fields(THD *thd,TABLE *entry);
#ifndef EMBEDDED_LIBRARY
static TABLE *delayed_get_table(THD *thd,TABLE_LIST *table_list);
static int write_delayed(THD *thd,TABLE *table, enum_duplicates dup,
			 char *query, uint query_length, bool log_on);
static void end_delayed_insert(THD *thd);
extern "C" pthread_handler_decl(handle_delayed_insert,arg);
static void unlink_blobs(register TABLE *table);
#endif

/* Define to force use of my_malloc() if the allocated memory block is big */

#ifndef HAVE_ALLOCA
#define my_safe_alloca(size, min_length) my_alloca(size)
#define my_safe_afree(ptr, size, min_length) my_afree(ptr)
#else
#define my_safe_alloca(size, min_length) ((size <= min_length) ? my_alloca(size) : my_malloc(size,MYF(0)))
#define my_safe_afree(ptr, size, min_length) if (size > min_length) my_free(ptr,MYF(0))
#endif

/*
  Check if insert fields are correct.
  Sets table->timestamp_default_now/on_update_now to 0 o leaves it to point
  to timestamp field, depending on if timestamp should be updated or not.
*/

static int
check_insert_fields(THD *thd, TABLE_LIST *table_list, List<Item> &fields,
		    List<Item> &values, ulong counter, bool check_unique)
{
  TABLE *table= table_list->table;

  if (fields.elements == 0 && values.elements != 0)
  {
    if (values.elements != table->fields)
    {
      my_printf_error(ER_WRONG_VALUE_COUNT_ON_ROW,
		      ER(ER_WRONG_VALUE_COUNT_ON_ROW),
		      MYF(0),counter);
      return -1;
    }
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (grant_option)
    {
      Field_iterator_table fields;
      fields.set_table(table);
      if (check_grant_all_columns(thd, INSERT_ACL, &table->grant,
                                  table->table_cache_key, table->real_name,
                                  &fields))
        return -1;
    }
#endif
    table->timestamp_default_now= table->timestamp_on_update_now= 0;
  }
  else
  {						// Part field list
    TABLE_LIST *save_next;
    int res;
    if (fields.elements != values.elements)
    {
      my_printf_error(ER_WRONG_VALUE_COUNT_ON_ROW,
		      ER(ER_WRONG_VALUE_COUNT_ON_ROW),
		      MYF(0),counter);
      return -1;
    }

    thd->dupp_field=0;
    thd->lex->select_lex.no_wrap_view_item= 1;
    save_next= table_list->next_local;        // fields only from first table
    table_list->next_local= 0;
    res= setup_fields(thd, 0, table_list, fields, 1, 0, 0);
    table_list->next_local= save_next;
    thd->lex->select_lex.no_wrap_view_item= 0;
    if (res)
      return -1;

    if (check_unique && thd->dupp_field)
    {
      my_error(ER_FIELD_SPECIFIED_TWICE,MYF(0), thd->dupp_field->field_name);
      return -1;
    }
    if (table->timestamp_field &&	// Don't set timestamp if used
	table->timestamp_field->query_id == thd->query_id)
      table->timestamp_default_now= table->timestamp_on_update_now= 0;
  }
  // For the values we need select_priv
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  table->grant.want_privilege=(SELECT_ACL & ~table->grant.privilege);
#endif
  return 0;
}


int mysql_insert(THD *thd,TABLE_LIST *table_list,
                 List<Item> &fields,
                 List<List_item> &values_list,
                 List<Item> &update_fields,
                 List<Item> &update_values,
                 enum_duplicates duplic)
{
  int error, res;
  /*
    log_on is about delayed inserts only.
    By default, both logs are enabled (this won't cause problems if the server
    runs without --log-update or --log-bin).
  */
  bool log_on= (thd->options & OPTION_BIN_LOG) || (!(thd->master_access & SUPER_ACL));
  bool transactional_table, log_delayed;
  uint value_count;
  ulong counter = 1;
  ulonglong id;
  COPY_INFO info;
  TABLE *table;
  List_iterator_fast<List_item> its(values_list);
  List_item *values;
#ifndef EMBEDDED_LIBRARY
  char *query= thd->query;
#endif
  thr_lock_type lock_type = table_list->lock_type;
  DBUG_ENTER("mysql_insert");

  /*
    in safe mode or with skip-new change delayed insert to be regular
    if we are told to replace duplicates, the insert cannot be concurrent
    delayed insert changed to regular in slave thread
   */
#ifdef EMBEDDED_LIBRARY
  if (lock_type == TL_WRITE_DELAYED)
    lock_type=TL_WRITE;
#else
  if ((lock_type == TL_WRITE_DELAYED &&
       ((specialflag & (SPECIAL_NO_NEW_FUNC | SPECIAL_SAFE_MODE)) ||
	thd->slave_thread || !thd->variables.max_insert_delayed_threads)) ||
      (lock_type == TL_WRITE_CONCURRENT_INSERT && duplic == DUP_REPLACE) ||
      (duplic == DUP_UPDATE))
    lock_type=TL_WRITE;
#endif
  table_list->lock_type= lock_type;

#ifndef EMBEDDED_LIBRARY
  if (lock_type == TL_WRITE_DELAYED)
  {
    if (thd->locked_tables)
    {
      if (find_locked_table(thd,
			    table_list->db ? table_list->db : thd->db,
			    table_list->real_name))
      {
	my_printf_error(ER_DELAYED_INSERT_TABLE_LOCKED,
			ER(ER_DELAYED_INSERT_TABLE_LOCKED),
			MYF(0), table_list->real_name);
	DBUG_RETURN(-1);
      }
    }
    if ((table= delayed_get_table(thd,table_list)) && !thd->is_fatal_error)
    {
      res= 0;
      if (table_list->next_global)			/* if sub select */
	res= open_and_lock_tables(thd, table_list->next_global);
      /*
	First is not processed by open_and_lock_tables() => we need set
	updateability flags "by hands".
      */
      if (!table_list->derived && !table_list->view)
        table_list->updatable= 1;  // usual table
    }
    else
    {
      /* Too many delayed insert threads;  Use a normal insert */
      table_list->lock_type= lock_type= TL_WRITE;
      res= open_and_lock_tables(thd, table_list);
    }
  }
  else
#endif /* EMBEDDED_LIBRARY */
    res= open_and_lock_tables(thd, table_list);
  if (res || thd->is_fatal_error)
    DBUG_RETURN(-1);

  table= table_list->table;
  thd->proc_info="init";
  thd->used_tables=0;
  values= its++;

  if (duplic == DUP_UPDATE && !table->insert_values)
  {
    /* it should be allocated before Item::fix_fields() */
    table->insert_values=
      (byte *)alloc_root(&thd->mem_root, table->rec_buff_length);
    if (!table->insert_values)
      goto abort;
  }

  if (mysql_prepare_insert(thd, table_list, table, fields, values,
			   update_fields, update_values, duplic))
    goto abort;

  // is table which we are changing used somewhere in other parts of query
  value_count= values->elements;
  while ((values= its++))
  {
    counter++;
    if (values->elements != value_count)
    {
      my_printf_error(ER_WRONG_VALUE_COUNT_ON_ROW,
		      ER(ER_WRONG_VALUE_COUNT_ON_ROW),
		      MYF(0),counter);
      goto abort;
    }
    if (setup_fields(thd, 0, table_list, *values, 0, 0, 0))
      goto abort;
  }
  its.rewind ();
  /*
    Fill in the given fields and dump it to the table file
  */

  info.records= info.deleted= info.copied= info.updated= 0;
  info.handle_duplicates=duplic;
  info.update_fields=&update_fields;
  info.update_values=&update_values;
  /*
    Count warnings for all inserts.
    For single line insert, generate an error if try to set a NOT NULL field
    to NULL
  */
  thd->count_cuted_fields= ((values_list.elements == 1) ?
			    CHECK_FIELD_ERROR_FOR_NULL :
			    CHECK_FIELD_WARN);
  thd->cuted_fields = 0L;
  table->next_number_field=table->found_next_number_field;

  error=0;
  id=0;
  thd->proc_info="update";
  if (duplic != DUP_ERROR)
    table->file->extra(HA_EXTRA_IGNORE_DUP_KEY);
  /*
    let's *try* to start bulk inserts. It won't necessary
    start them as values_list.elements should be greater than
    some - handler dependent - threshold.
    So we call start_bulk_insert to perform nesessary checks on
    values_list.elements, and - if nothing else - to initialize
    the code to make the call of end_bulk_insert() below safe.
  */
  if (lock_type != TL_WRITE_DELAYED)
    table->file->start_bulk_insert(values_list.elements);

  while ((values= its++))
  {
    if (fields.elements || !value_count)
    {
      restore_record(table,default_values);	// Get empty record
      if (fill_record(fields, *values, 0)|| thd->net.report_error ||
	  check_null_fields(thd,table))
      {
	if (values_list.elements != 1 && !thd->net.report_error)
	{
	  info.records++;
	  continue;
	}
	error=1;
	break;
      }
    }
    else
    {
      if (thd->used_tables)			// Column used in values()
	restore_record(table,default_values);	// Get empty record
      else
	table->record[0][0]=table->default_values[0]; // Fix delete marker
      if (fill_record(table->field,*values, 0) || thd->net.report_error)
      {
	if (values_list.elements != 1 && ! thd->net.report_error)
	{
	  info.records++;
	  continue;
	}
	error=1;
	break;
      }
    }
#ifndef EMBEDDED_LIBRARY
    if (lock_type == TL_WRITE_DELAYED)
    {
      error=write_delayed(thd,table,duplic,query, thd->query_length, log_on);
      query=0;
    }
    else
#endif
      error=write_record(table,&info);
    if (error)
      break;
    /*
      If auto_increment values are used, save the first one
       for LAST_INSERT_ID() and for the update log.
       We can't use insert_id() as we don't want to touch the
       last_insert_id_used flag.
    */
    if (! id && thd->insert_id_used)
    {						// Get auto increment value
      id= thd->last_insert_id;
    }
    thd->row_count++;
  }

  /*
    Now all rows are inserted.  Time to update logs and sends response to
    user
  */
#ifndef EMBEDDED_LIBRARY
  if (lock_type == TL_WRITE_DELAYED)
  {
    if (!error)
    {
      id=0;					// No auto_increment id
      info.copied=values_list.elements;
      end_delayed_insert(thd);
    }
    query_cache_invalidate3(thd, table_list, 1);
  }
  else
#endif
  {
    if (table->file->end_bulk_insert() && !error)
    {
      table->file->print_error(my_errno,MYF(0));
      error=1;
    }
    if (id && values_list.elements != 1)
      thd->insert_id(id);			// For update log
    else if (table->next_number_field && info.copied)
      id=table->next_number_field->val_int();	// Return auto_increment value

    /*
      Invalidate the table in the query cache if something changed.
      For the transactional algorithm to work the invalidation must be
      before binlog writing and ha_autocommit_...
    */
    if (info.copied || info.deleted || info.updated)
    {
      query_cache_invalidate3(thd, table_list, 1);
    }

    transactional_table= table->file->has_transactions();

    log_delayed= (transactional_table || table->tmp_table);
    if ((info.copied || info.deleted || info.updated) &&
	(error <= 0 || !transactional_table))
    {
      if (mysql_bin_log.is_open())
      {
        if (error <= 0)
          thd->clear_error();
	Query_log_event qinfo(thd, thd->query, thd->query_length,
			      log_delayed);
	if (mysql_bin_log.write(&qinfo) && transactional_table)
	  error=1;
      }
      if (!log_delayed)
	thd->options|=OPTION_STATUS_NO_TRANS_UPDATE;
    }
    if (transactional_table)
      error=ha_autocommit_or_rollback(thd,error);

    if (thd->lock)
    {
      mysql_unlock_tables(thd, thd->lock);
      thd->lock=0;
    }
  }
  thd->proc_info="end";
  table->next_number_field=0;
  thd->count_cuted_fields= CHECK_FIELD_IGNORE;
  thd->next_insert_id=0;			// Reset this if wrongly used
  if (duplic != DUP_ERROR)
    table->file->extra(HA_EXTRA_NO_IGNORE_DUP_KEY);

  /* Reset value of LAST_INSERT_ID if no rows where inserted */
  if (!info.copied && thd->insert_id_used)
  {
    thd->insert_id(0);
    id=0;
  }
  if (error)
    goto abort;
  if (values_list.elements == 1 && (!(thd->options & OPTION_WARNINGS) ||
				    !thd->cuted_fields))
  {
    thd->row_count_func= info.copied+info.deleted+info.updated;
    send_ok(thd, (ulong) thd->row_count_func, id);
  }
  else
  {
    char buff[160];
    if (duplic == DUP_IGNORE)
      sprintf(buff, ER(ER_INSERT_INFO), (ulong) info.records,
	      (lock_type == TL_WRITE_DELAYED) ? (ulong) 0 :
	      (ulong) (info.records - info.copied), (ulong) thd->cuted_fields);
    else
      sprintf(buff, ER(ER_INSERT_INFO), (ulong) info.records,
	      (ulong) (info.deleted+info.updated), (ulong) thd->cuted_fields);
    thd->row_count_func= info.copied+info.deleted+info.updated;
    ::send_ok(thd, (ulong) thd->row_count_func, id, buff);
  }
  free_underlaid_joins(thd, &thd->lex->select_lex);
  table->insert_values=0;
  DBUG_RETURN(0);

abort:
#ifndef EMBEDDED_LIBRARY
  if (lock_type == TL_WRITE_DELAYED)
    end_delayed_insert(thd);
#endif
  free_underlaid_joins(thd, &thd->lex->select_lex);
  table->insert_values=0;
  DBUG_RETURN(-1);
}


/*
  Additional check for insertability for VIEW

  SYNOPSIS
    check_view_insertability()
    view    - reference on VIEW

  IMPLEMENTATION
    A view is insertable if the folloings are true:
    - All columns in the view are columns from a table
    - All not used columns in table have a default values
    - All field in view are unique (not referring to the same column)

  RETURN
    FALSE - OK
      view->contain_auto_increment is 1 if and only if the view contains an
      auto_increment field

    TRUE  - can't be used for insert
*/

static bool check_view_insertability(TABLE_LIST *view, ulong query_id)
{
  uint num= view->view->select_lex.item_list.elements;
  TABLE *table= view->table;
  Item **trans_start= view->field_translation, **trans_end=trans_start+num;
  Item **trans;
  Field **field_ptr= table->field;
  ulong other_query_id= query_id - 1;
  DBUG_ENTER("check_key_in_view");

  DBUG_ASSERT(view->table != 0 && view->field_translation != 0);

  view->contain_auto_increment= 0;
  /* check simplicity and prepare unique test of view */
  for (trans= trans_start; trans != trans_end; trans++)
  {
    Item_field *field;
    /* simple SELECT list entry (field without expression) */
    if ((*trans)->type() != Item::FIELD_ITEM)
      DBUG_RETURN(TRUE);
    field= (Item_field *)(*trans);
    if (field->field->unireg_check == Field::NEXT_NUMBER)
      view->contain_auto_increment= 1;
    /* prepare unique test */
    field->field->query_id= other_query_id;
  }
  /* unique test */
  for (trans= trans_start; trans != trans_end; trans++)
  {
    /* Thanks to test above, we know that all columns are of type Item_field */
    Item_field *field= (Item_field *)(*trans);
    if (field->field->query_id == query_id)
      DBUG_RETURN(TRUE);
    field->field->query_id= query_id;
  }

  /* VIEW contain all fields without default value */
  for (; *field_ptr; field_ptr++)
  {
    Field *field= *field_ptr;
    /* field have not default value */
    if ((field->type() == FIELD_TYPE_BLOB) &&
        (table->timestamp_field != field ||
         field->unireg_check == Field::TIMESTAMP_UN_FIELD))
    {
      for (trans= trans_start; ; trans++)
      {
        if (trans == trans_end)
          DBUG_RETURN(TRUE);                    // Field was not part of view
        if (((Item_field *)(*trans))->field == *field_ptr)
          break;                                // ok
      }
    }
  }
  DBUG_RETURN(FALSE);
}


/*
  Check if table can be updated

  SYNOPSIS
     mysql_prepare_insert_check_table()
     thd		Thread handle
     table_list		Table list (only one table)
     fields		List of fields to be updated
     where		Pointer to where clause

   RETURN
     0	ok
     1  ERROR
*/

static bool mysql_prepare_insert_check_table(THD *thd, TABLE_LIST *table_list,
                                             List<Item> &fields, COND **where)
{
  bool insert_into_view= (table_list->view != 0);
  DBUG_ENTER("mysql_prepare_insert_check_table");

  if (setup_tables(thd, table_list, where))
    DBUG_RETURN(1);

  if (insert_into_view && !fields.elements)
  {
    thd->lex->empty_field_list_on_rset= 1;
    insert_view_fields(&fields, table_list);
  }

  if (!table_list->updatable ||
      check_key_in_view(thd, table_list) ||
      (insert_into_view &&
       check_view_insertability(table_list, thd->query_id)))
  {
    my_error(ER_NON_UPDATABLE_TABLE, MYF(0), table_list->alias, "INSERT");
    DBUG_RETURN(1);
  }
  DBUG_RETURN(0);
}


/*
  Prepare items in INSERT statement

  SYNOPSIS
    mysql_prepare_insert()
    thd			Thread handler
    table_list	        Global/local table list

  RETURN VALUE
    0   OK
    -1  error (message is not sent to user)
*/

int mysql_prepare_insert(THD *thd, TABLE_LIST *table_list, TABLE *table,
			 List<Item> &fields, List_item *values,
			 List<Item> &update_fields, List<Item> &update_values,
			 enum_duplicates duplic)
{
  bool insert_into_view= (table_list->view != 0);
  /* TODO: use this condition for 'WITH CHECK OPTION' */
  Item *unused_conds= 0;
  int res;
  DBUG_ENTER("mysql_prepare_insert");

  if (mysql_prepare_insert_check_table(thd, table_list, fields, &unused_conds))
    DBUG_RETURN(-1);

  if (check_insert_fields(thd, table_list, fields, *values, 1,
                          !insert_into_view) ||
      setup_fields(thd, 0, table_list, *values, 0, 0, 0) ||
      (duplic == DUP_UPDATE &&
       ((thd->lex->select_lex.no_wrap_view_item= 1,
         (res= setup_fields(thd, 0, table_list, update_fields, 0, 0, 0)),
         thd->lex->select_lex.no_wrap_view_item= 0,
         res) ||
        setup_fields(thd, 0, table_list, update_values, 0, 0, 0))))
    DBUG_RETURN(-1);

  if (find_table_in_global_list(table_list->next_global,
			      table_list->db, table_list->real_name))
  {
    my_error(ER_UPDATE_TABLE_USED, MYF(0), table_list->real_name);
    DBUG_RETURN(-1);
  }
  thd->lex->select_lex.first_execution= 0;
  DBUG_RETURN(0);
}


	/* Check if there is more uniq keys after field */

static int last_uniq_key(TABLE *table,uint keynr)
{
  while (++keynr < table->keys)
    if (table->key_info[keynr].flags & HA_NOSAME)
      return 0;
  return 1;
}


/*
  Write a record to table with optional deleting of conflicting records
*/


int write_record(TABLE *table,COPY_INFO *info)
{
  int error;
  char *key=0;
  DBUG_ENTER("write_record");

  info->records++;
  if (info->handle_duplicates == DUP_REPLACE ||
      info->handle_duplicates == DUP_UPDATE)
  {
    while ((error=table->file->write_row(table->record[0])))
    {
      if (error != HA_WRITE_SKIP)
	goto err;
      uint key_nr;
      if ((int) (key_nr = table->file->get_dup_key(error)) < 0)
      {
	error=HA_WRITE_SKIP;			/* Database can't find key */
	goto err;
      }
      /*
	Don't allow REPLACE to replace a row when a auto_increment column
	was used.  This ensures that we don't get a problem when the
	whole range of the key has been used.
      */
      if (info->handle_duplicates == DUP_REPLACE &&
          table->next_number_field &&
          key_nr == table->next_number_index &&
	  table->file->auto_increment_column_changed)
	goto err;
      if (table->file->table_flags() & HA_DUPP_POS)
      {
	if (table->file->rnd_pos(table->record[1],table->file->dupp_ref))
	  goto err;
      }
      else
      {
	if (table->file->extra(HA_EXTRA_FLUSH_CACHE)) /* Not needed with NISAM */
	{
	  error=my_errno;
	  goto err;
	}

	if (!key)
	{
	  if (!(key=(char*) my_safe_alloca(table->max_unique_length,
					   MAX_KEY_LENGTH)))
	  {
	    error=ENOMEM;
	    goto err;
	  }
	}
	key_copy((byte*) key,table,key_nr,0);
	if ((error=(table->file->index_read_idx(table->record[1],key_nr,
						(byte*) key,
						table->key_info[key_nr].
						key_length,
						HA_READ_KEY_EXACT))))
	  goto err;
      }
      if (info->handle_duplicates == DUP_UPDATE)
      {
        /* we don't check for other UNIQUE keys - the first row
           that matches, is updated. If update causes a conflict again,
           an error is returned
        */
        store_record(table,insert_values);
        restore_record(table,record[1]);
        if (fill_record(*info->update_fields, *info->update_values, 0))
          goto err;
        if ((error=table->file->update_row(table->record[1],table->record[0])))
          goto err;
        info->updated++;
        break;
      }
      else /* DUP_REPLACE */
      {
	/*
	  The manual defines the REPLACE semantics that it is either
	  an INSERT or DELETE(s) + INSERT; FOREIGN KEY checks in
	  InnoDB do not function in the defined way if we allow MySQL
	  to convert the latter operation internally to an UPDATE.
          We also should not perform this conversion if we have 
          timestamp field with ON UPDATE which is different from DEFAULT.
	*/
	if (last_uniq_key(table,key_nr) &&
	    !table->file->referenced_by_foreign_key() &&
            table->timestamp_default_now == table->timestamp_on_update_now)
        {
          if ((error=table->file->update_row(table->record[1],
					     table->record[0])))
            goto err;
          info->deleted++;
          break;				/* Update logfile and count */
        }
        else if ((error=table->file->delete_row(table->record[1])))
          goto err;
        info->deleted++;
      }
    }
    info->copied++;
  }
  else if ((error=table->file->write_row(table->record[0])))
  {
    if (info->handle_duplicates != DUP_IGNORE ||
	(error != HA_ERR_FOUND_DUPP_KEY && error != HA_ERR_FOUND_DUPP_UNIQUE))
      goto err;
  }
  else
    info->copied++;
  if (key)
    my_safe_afree(key,table->max_unique_length,MAX_KEY_LENGTH);
  DBUG_RETURN(0);

err:
  if (key)
    my_afree(key);
  info->last_errno= error;
  table->file->print_error(error,MYF(0));
  DBUG_RETURN(1);
}


/******************************************************************************
  Check that all fields with arn't null_fields are used
  If DONT_USE_DEFAULT_FIELDS isn't defined use default value for not set
  fields.
******************************************************************************/

static int check_null_fields(THD *thd __attribute__((unused)),
			     TABLE *entry __attribute__((unused)))
{
#ifdef DONT_USE_DEFAULT_FIELDS
  for (Field **field=entry->field ; *field ; field++)
  {
    if ((*field)->query_id != thd->query_id && !(*field)->maybe_null() &&
	*field != entry->timestamp_field &&
	*field != entry->next_number_field)
    {
      my_printf_error(ER_BAD_NULL_ERROR, ER(ER_BAD_NULL_ERROR),MYF(0),
		      (*field)->field_name);
      return 1;
    }
  }
#endif
  return 0;
}

/*****************************************************************************
  Handling of delayed inserts
  A thread is created for each table that one uses with the DELAYED attribute.
*****************************************************************************/

#ifndef EMBEDDED_LIBRARY

class delayed_row :public ilink {
public:
  char *record,*query;
  enum_duplicates dup;
  time_t start_time;
  bool query_start_used,last_insert_id_used,insert_id_used, log_query;
  ulonglong last_insert_id;
  ulong timestamp_default_now;
  ulong timestamp_on_update_now;
  uint query_length;

  delayed_row(enum_duplicates dup_arg, bool log_query_arg)
    :record(0),query(0),dup(dup_arg),log_query(log_query_arg) {}
  ~delayed_row()
  {
    x_free(record);
  }
};


class delayed_insert :public ilink {
  uint locks_in_memory;
public:
  THD thd;
  TABLE *table;
  pthread_mutex_t mutex;
  pthread_cond_t cond,cond_client;
  volatile uint tables_in_use,stacked_inserts;
  volatile bool status,dead;
  COPY_INFO info;
  I_List<delayed_row> rows;
  uint group_count;
  TABLE_LIST table_list;			// Argument

  delayed_insert()
    :locks_in_memory(0),
     table(0),tables_in_use(0),stacked_inserts(0), status(0), dead(0),
     group_count(0)
  {
    thd.user=thd.priv_user=(char*) delayed_user;
    thd.host=(char*) my_localhost;
    thd.current_tablenr=0;
    thd.version=refresh_version;
    thd.command=COM_DELAYED_INSERT;
    thd.lex->current_select= 0; /* for my_message_sql */

    bzero((char*) &thd.net, sizeof(thd.net));		// Safety
    bzero((char*) &table_list, sizeof(table_list));	// Safety
    thd.system_thread= SYSTEM_THREAD_DELAYED_INSERT;
    thd.host_or_ip= "";
    bzero((char*) &info,sizeof(info));
    pthread_mutex_init(&mutex,MY_MUTEX_INIT_FAST);
    pthread_cond_init(&cond,NULL);
    pthread_cond_init(&cond_client,NULL);
    VOID(pthread_mutex_lock(&LOCK_thread_count));
    delayed_insert_threads++;
    VOID(pthread_mutex_unlock(&LOCK_thread_count));
  }
  ~delayed_insert()
  {
    /* The following is not really needed, but just for safety */
    delayed_row *row;
    while ((row=rows.get()))
      delete row;
    if (table)
      close_thread_tables(&thd);
    VOID(pthread_mutex_lock(&LOCK_thread_count));
    pthread_mutex_destroy(&mutex);
    pthread_cond_destroy(&cond);
    pthread_cond_destroy(&cond_client);
    thd.unlink();				// Must be unlinked under lock
    x_free(thd.query);
    thd.user=thd.host=0;
    thread_count--;
    delayed_insert_threads--;
    VOID(pthread_mutex_unlock(&LOCK_thread_count));
    VOID(pthread_cond_broadcast(&COND_thread_count)); /* Tell main we are ready */
  }

  /* The following is for checking when we can delete ourselves */
  inline void lock()
  {
    locks_in_memory++;				// Assume LOCK_delay_insert
  }
  void unlock()
  {
    pthread_mutex_lock(&LOCK_delayed_insert);
    if (!--locks_in_memory)
    {
      pthread_mutex_lock(&mutex);
      if (thd.killed && ! stacked_inserts && ! tables_in_use)
      {
	pthread_cond_signal(&cond);
	status=1;
      }
      pthread_mutex_unlock(&mutex);
    }
    pthread_mutex_unlock(&LOCK_delayed_insert);
  }
  inline uint lock_count() { return locks_in_memory; }

  TABLE* get_local_table(THD* client_thd);
  bool handle_inserts(void);
};


I_List<delayed_insert> delayed_threads;


delayed_insert *find_handler(THD *thd, TABLE_LIST *table_list)
{
  thd->proc_info="waiting for delay_list";
  pthread_mutex_lock(&LOCK_delayed_insert);	// Protect master list
  I_List_iterator<delayed_insert> it(delayed_threads);
  delayed_insert *tmp;
  while ((tmp=it++))
  {
    if (!strcmp(tmp->thd.db,table_list->db) &&
	!strcmp(table_list->real_name,tmp->table->real_name))
    {
      tmp->lock();
      break;
    }
  }
  pthread_mutex_unlock(&LOCK_delayed_insert); // For unlink from list
  return tmp;
}


static TABLE *delayed_get_table(THD *thd,TABLE_LIST *table_list)
{
  int error;
  delayed_insert *tmp;
  DBUG_ENTER("delayed_get_table");

  if (!table_list->db)
    table_list->db=thd->db;

  /* no match; create a new thread to handle the table */
  if (!(tmp=find_handler(thd,table_list)))
  {
    /* Don't create more than max_insert_delayed_threads */
    if (delayed_insert_threads >= thd->variables.max_insert_delayed_threads)
      DBUG_RETURN(0);
    thd->proc_info="Creating delayed handler";
    pthread_mutex_lock(&LOCK_delayed_create);
    if (!(tmp=find_handler(thd,table_list)))	// Was just created
    {
      if (!(tmp=new delayed_insert()))
      {
	thd->fatal_error();
	my_error(ER_OUTOFMEMORY,MYF(0),sizeof(delayed_insert));
	pthread_mutex_unlock(&LOCK_delayed_create);
	DBUG_RETURN(0);
      }
      pthread_mutex_lock(&LOCK_thread_count);
      thread_count++;
      pthread_mutex_unlock(&LOCK_thread_count);
      if (!(tmp->thd.db=my_strdup(table_list->db,MYF(MY_WME))) ||
	  !(tmp->thd.query=my_strdup(table_list->real_name,MYF(MY_WME))))
      {
	delete tmp;
	thd->fatal_error();
	my_error(ER_OUT_OF_RESOURCES,MYF(0));
	pthread_mutex_unlock(&LOCK_delayed_create);
	DBUG_RETURN(0);
      }
      tmp->table_list= *table_list;			// Needed to open table
      tmp->table_list.db= tmp->thd.db;
      tmp->table_list.alias= tmp->table_list.real_name=tmp->thd.query;
      tmp->lock();
      pthread_mutex_lock(&tmp->mutex);
      if ((error=pthread_create(&tmp->thd.real_id,&connection_attrib,
				handle_delayed_insert,(void*) tmp)))
      {
	DBUG_PRINT("error",
		   ("Can't create thread to handle delayed insert (error %d)",
		    error));
	pthread_mutex_unlock(&tmp->mutex);
	tmp->unlock();
	delete tmp;
	thd->fatal_error();
	pthread_mutex_unlock(&LOCK_delayed_create);
	net_printf(thd,ER_CANT_CREATE_THREAD,error);
	DBUG_RETURN(0);
      }

      /* Wait until table is open */
      thd->proc_info="waiting for handler open";
      while (!tmp->thd.killed && !tmp->table && !thd->killed)
      {
	pthread_cond_wait(&tmp->cond_client,&tmp->mutex);
      }
      pthread_mutex_unlock(&tmp->mutex);
      thd->proc_info="got old table";
      if (tmp->thd.killed)
      {
	if (tmp->thd.is_fatal_error)
	{
	  /* Copy error message and abort */
	  thd->fatal_error();
	  strmov(thd->net.last_error,tmp->thd.net.last_error);
	  thd->net.last_errno=tmp->thd.net.last_errno;
	}
	tmp->unlock();
	pthread_mutex_unlock(&LOCK_delayed_create);
	DBUG_RETURN(0);				// Continue with normal insert
      }
      if (thd->killed)
      {
	tmp->unlock();
	pthread_mutex_unlock(&LOCK_delayed_create);
	DBUG_RETURN(0);
      }
    }
    pthread_mutex_unlock(&LOCK_delayed_create);
  }

  pthread_mutex_lock(&tmp->mutex);
  TABLE *table=tmp->get_local_table(thd);
  pthread_mutex_unlock(&tmp->mutex);
  tmp->unlock();
  if (table)
    thd->di=tmp;
  else if (tmp->thd.is_fatal_error)
    thd->fatal_error();
  DBUG_RETURN((table_list->table=table));
}


/*
  As we can't let many threads modify the same TABLE structure, we create
  an own structure for each tread.  This includes a row buffer to save the
  column values and new fields that points to the new row buffer.
  The memory is allocated in the client thread and is freed automaticly.
*/

TABLE *delayed_insert::get_local_table(THD* client_thd)
{
  my_ptrdiff_t adjust_ptrs;
  Field **field,**org_field, *found_next_number_field;
  TABLE *copy;

  /* First request insert thread to get a lock */
  status=1;
  tables_in_use++;
  if (!thd.lock)				// Table is not locked
  {
    client_thd->proc_info="waiting for handler lock";
    pthread_cond_signal(&cond);			// Tell handler to lock table
    while (!dead && !thd.lock && ! client_thd->killed)
    {
      pthread_cond_wait(&cond_client,&mutex);
    }
    client_thd->proc_info="got handler lock";
    if (client_thd->killed)
      goto error;
    if (dead)
    {
      strmov(client_thd->net.last_error,thd.net.last_error);
      client_thd->net.last_errno=thd.net.last_errno;
      goto error;
    }
  }

  client_thd->proc_info="allocating local table";
  copy= (TABLE*) client_thd->alloc(sizeof(*copy)+
				   (table->fields+1)*sizeof(Field**)+
				   table->reclength);
  if (!copy)
    goto error;
  *copy= *table;
  bzero((char*) &copy->name_hash,sizeof(copy->name_hash)); // No name hashing
  /* We don't need to change the file handler here */

  field=copy->field=(Field**) (copy+1);
  copy->record[0]=(byte*) (field+table->fields+1);
  memcpy((char*) copy->record[0],(char*) table->record[0],table->reclength);

  /* Make a copy of all fields */

  adjust_ptrs=PTR_BYTE_DIFF(copy->record[0],table->record[0]);

  found_next_number_field=table->found_next_number_field;
  for (org_field=table->field ; *org_field ; org_field++,field++)
  {
    if (!(*field= (*org_field)->new_field(&client_thd->mem_root,copy)))
      return 0;
    (*field)->orig_table= copy;			// Remove connection
    (*field)->move_field(adjust_ptrs);		// Point at copy->record[0]
    if (*org_field == found_next_number_field)
      (*field)->table->found_next_number_field= *field;
  }
  *field=0;

  /* Adjust timestamp */
  if (table->timestamp_field)
  {
    /* Restore offset as this may have been reset in handle_inserts */
    copy->timestamp_field=
      (Field_timestamp*) copy->field[table->timestamp_field_offset];
    copy->timestamp_field->unireg_check= table->timestamp_field->unireg_check;
    copy->timestamp_field->set_timestamp_offsets();
  }

  /* _rowid is not used with delayed insert */
  copy->rowid_field=0;

  /* Adjust in_use for pointing to client thread */
  copy->in_use= client_thd;
  
  return copy;

  /* Got fatal error */
 error:
  tables_in_use--;
  status=1;
  pthread_cond_signal(&cond);			// Inform thread about abort
  return 0;
}


/* Put a question in queue */

static int write_delayed(THD *thd,TABLE *table,enum_duplicates duplic,
			 char *query, uint query_length, bool log_on)
{
  delayed_row *row=0;
  delayed_insert *di=thd->di;
  DBUG_ENTER("write_delayed");

  thd->proc_info="waiting for handler insert";
  pthread_mutex_lock(&di->mutex);
  while (di->stacked_inserts >= delayed_queue_size && !thd->killed)
    pthread_cond_wait(&di->cond_client,&di->mutex);
  thd->proc_info="storing row into queue";

  if (thd->killed || !(row= new delayed_row(duplic, log_on)))
    goto err;

  if (!query)
    query_length=0;
  if (!(row->record= (char*) my_malloc(table->reclength+query_length+1,
				       MYF(MY_WME))))
    goto err;
  memcpy(row->record,table->record[0],table->reclength);
  if (query_length)
  {
    row->query=row->record+table->reclength;
    memcpy(row->query,query,query_length+1);
  }
  row->query_length=		query_length;
  row->start_time=		thd->start_time;
  row->query_start_used=	thd->query_start_used;
  row->last_insert_id_used=	thd->last_insert_id_used;
  row->insert_id_used=		thd->insert_id_used;
  row->last_insert_id=		thd->last_insert_id;
  row->timestamp_default_now=	table->timestamp_default_now;
  row->timestamp_on_update_now=	table->timestamp_on_update_now;

  di->rows.push_back(row);
  di->stacked_inserts++;
  di->status=1;
  if (table->blob_fields)
    unlink_blobs(table);
  pthread_cond_signal(&di->cond);

  thread_safe_increment(delayed_rows_in_use,&LOCK_delayed_status);
  pthread_mutex_unlock(&di->mutex);
  DBUG_RETURN(0);

 err:
  delete row;
  pthread_mutex_unlock(&di->mutex);
  DBUG_RETURN(1);
}


static void end_delayed_insert(THD *thd)
{
  DBUG_ENTER("end_delayed_insert");
  delayed_insert *di=thd->di;
  pthread_mutex_lock(&di->mutex);
  DBUG_PRINT("info",("tables in use: %d",di->tables_in_use));
  if (!--di->tables_in_use || di->thd.killed)
  {						// Unlock table
    di->status=1;
    pthread_cond_signal(&di->cond);
  }
  pthread_mutex_unlock(&di->mutex);
  DBUG_VOID_RETURN;
}


/* We kill all delayed threads when doing flush-tables */

void kill_delayed_threads(void)
{
  VOID(pthread_mutex_lock(&LOCK_delayed_insert)); // For unlink from list

  I_List_iterator<delayed_insert> it(delayed_threads);
  delayed_insert *tmp;
  while ((tmp=it++))
  {
    /* Ensure that the thread doesn't kill itself while we are looking at it */
    pthread_mutex_lock(&tmp->mutex);
    tmp->thd.killed= THD::KILL_CONNECTION;
    if (tmp->thd.mysys_var)
    {
      pthread_mutex_lock(&tmp->thd.mysys_var->mutex);
      if (tmp->thd.mysys_var->current_cond)
      {
	/*
	  We need the following test because the main mutex may be locked
	  in handle_delayed_insert()
	*/
	if (&tmp->mutex != tmp->thd.mysys_var->current_mutex)
	  pthread_mutex_lock(tmp->thd.mysys_var->current_mutex);
	pthread_cond_broadcast(tmp->thd.mysys_var->current_cond);
	if (&tmp->mutex != tmp->thd.mysys_var->current_mutex)
	  pthread_mutex_unlock(tmp->thd.mysys_var->current_mutex);
      }
      pthread_mutex_unlock(&tmp->thd.mysys_var->mutex);
    }
    pthread_mutex_unlock(&tmp->mutex);
  }
  VOID(pthread_mutex_unlock(&LOCK_delayed_insert)); // For unlink from list
}


/*
 * Create a new delayed insert thread
*/

extern "C" pthread_handler_decl(handle_delayed_insert,arg)
{
  delayed_insert *di=(delayed_insert*) arg;
  THD *thd= &di->thd;

  pthread_detach_this_thread();
  /* Add thread to THD list so that's it's visible in 'show processlist' */
  pthread_mutex_lock(&LOCK_thread_count);
  thd->thread_id=thread_id++;
  thd->end_time();
  threads.append(thd);
  thd->killed=abort_loop ? THD::KILL_CONNECTION : THD::NOT_KILLED;
  pthread_mutex_unlock(&LOCK_thread_count);

  pthread_mutex_lock(&di->mutex);
#if !defined( __WIN__) && !defined(OS2)	/* Win32 calls this in pthread_create */
  if (my_thread_init())
  {
    strmov(thd->net.last_error,ER(thd->net.last_errno=ER_OUT_OF_RESOURCES));
    goto end;
  }
#endif

  DBUG_ENTER("handle_delayed_insert");
  if (init_thr_lock() || thd->store_globals())
  {
    thd->fatal_error();
    strmov(thd->net.last_error,ER(thd->net.last_errno=ER_OUT_OF_RESOURCES));
    goto end;
  }
#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__)
  sigset_t set;
  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
#endif

  /* open table */

  if (!(di->table=open_ltable(thd,&di->table_list,TL_WRITE_DELAYED)))
  {
    thd->fatal_error();				// Abort waiting inserts
    goto end;
  }
  if (!(di->table->file->table_flags() & HA_CAN_INSERT_DELAYED))
  {
    thd->fatal_error();
    my_error(ER_ILLEGAL_HA, MYF(0), di->table_list.real_name);
    goto end;
  }
  di->table->copy_blobs=1;

  /* One can now use this */
  pthread_mutex_lock(&LOCK_delayed_insert);
  delayed_threads.append(di);
  pthread_mutex_unlock(&LOCK_delayed_insert);

  /* Tell client that the thread is initialized */
  pthread_cond_signal(&di->cond_client);

  /* Now wait until we get an insert or lock to handle */
  /* We will not abort as long as a client thread uses this thread */

  for (;;)
  {
    if (thd->killed == THD::KILL_CONNECTION)
    {
      uint lock_count;
      /*
	Remove this from delay insert list so that no one can request a
	table from this
      */
      pthread_mutex_unlock(&di->mutex);
      pthread_mutex_lock(&LOCK_delayed_insert);
      di->unlink();
      lock_count=di->lock_count();
      pthread_mutex_unlock(&LOCK_delayed_insert);
      pthread_mutex_lock(&di->mutex);
      if (!lock_count && !di->tables_in_use && !di->stacked_inserts)
	break;					// Time to die
    }

    if (!di->status && !di->stacked_inserts)
    {
      struct timespec abstime;
      set_timespec(abstime, delayed_insert_timeout);

      /* Information for pthread_kill */
      di->thd.mysys_var->current_mutex= &di->mutex;
      di->thd.mysys_var->current_cond= &di->cond;
      di->thd.proc_info="Waiting for INSERT";

      DBUG_PRINT("info",("Waiting for someone to insert rows"));
      while (!thd->killed)
      {
	int error;
#if defined(HAVE_BROKEN_COND_TIMEDWAIT)
	error=pthread_cond_wait(&di->cond,&di->mutex);
#else
	error=pthread_cond_timedwait(&di->cond,&di->mutex,&abstime);
#ifdef EXTRA_DEBUG
	if (error && error != EINTR && error != ETIMEDOUT)
	{
	  fprintf(stderr, "Got error %d from pthread_cond_timedwait\n",error);
	  DBUG_PRINT("error",("Got error %d from pthread_cond_timedwait",
			      error));
	}
#endif
#endif
	if (thd->killed || di->status)
	  break;
	if (error == ETIME || error == ETIMEDOUT)
	{
	  thd->killed= THD::KILL_CONNECTION;
	  break;
	}
      }
      /* We can't lock di->mutex and mysys_var->mutex at the same time */
      pthread_mutex_unlock(&di->mutex);
      pthread_mutex_lock(&di->thd.mysys_var->mutex);
      di->thd.mysys_var->current_mutex= 0;
      di->thd.mysys_var->current_cond= 0;
      pthread_mutex_unlock(&di->thd.mysys_var->mutex);
      pthread_mutex_lock(&di->mutex);
    }
    di->thd.proc_info=0;

    if (di->tables_in_use && ! thd->lock)
    {
      /* request for new delayed insert */
      if (!(thd->lock=mysql_lock_tables(thd,&di->table,1)))
      {
	/* Fatal error */
	di->dead= 1;
	thd->killed= THD::KILL_CONNECTION;
      }
      pthread_cond_broadcast(&di->cond_client);
    }
    if (di->stacked_inserts)
    {
      if (di->handle_inserts())
      {
	/* Some fatal error */
	di->dead= 1;
	thd->killed= THD::KILL_CONNECTION;
      }
    }
    di->status=0;
    if (!di->stacked_inserts && !di->tables_in_use && thd->lock)
    {
      /*
        No one is doing a insert delayed
        Unlock table so that other threads can use it
      */
      MYSQL_LOCK *lock=thd->lock;
      thd->lock=0;
      pthread_mutex_unlock(&di->mutex);
      mysql_unlock_tables(thd, lock);
      di->group_count=0;
      pthread_mutex_lock(&di->mutex);
    }
    if (di->tables_in_use)
      pthread_cond_broadcast(&di->cond_client); // If waiting clients
  }

end:
  /*
    di should be unlinked from the thread handler list and have no active
    clients
  */

  close_thread_tables(thd);			// Free the table
  di->table=0;
  di->dead= 1;                                  // If error
  thd->killed= THD::KILL_CONNECTION;	        // If error
  pthread_cond_broadcast(&di->cond_client);	// Safety
  pthread_mutex_unlock(&di->mutex);

  pthread_mutex_lock(&LOCK_delayed_create);	// Because of delayed_get_table
  pthread_mutex_lock(&LOCK_delayed_insert);	
  delete di;
  pthread_mutex_unlock(&LOCK_delayed_insert);
  pthread_mutex_unlock(&LOCK_delayed_create);  

  my_thread_end();
  pthread_exit(0);
  DBUG_RETURN(0);
}


/* Remove pointers from temporary fields to allocated values */

static void unlink_blobs(register TABLE *table)
{
  for (Field **ptr=table->field ; *ptr ; ptr++)
  {
    if ((*ptr)->flags & BLOB_FLAG)
      ((Field_blob *) (*ptr))->clear_temporary();
  }
}

/* Free blobs stored in current row */

static void free_delayed_insert_blobs(register TABLE *table)
{
  for (Field **ptr=table->field ; *ptr ; ptr++)
  {
    if ((*ptr)->flags & BLOB_FLAG)
    {
      char *str;
      ((Field_blob *) (*ptr))->get_ptr(&str);
      my_free(str,MYF(MY_ALLOW_ZERO_PTR));
      ((Field_blob *) (*ptr))->reset();
    }
  }
}


bool delayed_insert::handle_inserts(void)
{
  int error;
  uint max_rows;
  bool using_ignore=0, using_bin_log=mysql_bin_log.is_open();
  delayed_row *row;
  DBUG_ENTER("handle_inserts");

  /* Allow client to insert new rows */
  pthread_mutex_unlock(&mutex);

  table->next_number_field=table->found_next_number_field;

  thd.proc_info="upgrading lock";
  if (thr_upgrade_write_delay_lock(*thd.lock->locks))
  {
    /* This can only happen if thread is killed by shutdown */
    sql_print_error(ER(ER_DELAYED_CANT_CHANGE_LOCK),table->real_name);
    goto err;
  }

  thd.proc_info="insert";
  max_rows=delayed_insert_limit;
  if (thd.killed || table->version != refresh_version)
  {
    thd.killed= THD::KILL_CONNECTION;
    max_rows= ~0;				// Do as much as possible
  }

  /*
    We can't use row caching when using the binary log because if
    we get a crash, then binary log will contain rows that are not yet
    written to disk, which will cause problems in replication.
  */
  if (!using_bin_log)
    table->file->extra(HA_EXTRA_WRITE_CACHE);
  pthread_mutex_lock(&mutex);
  while ((row=rows.get()))
  {
    stacked_inserts--;
    pthread_mutex_unlock(&mutex);
    memcpy(table->record[0],row->record,table->reclength);

    thd.start_time=row->start_time;
    thd.query_start_used=row->query_start_used;
    thd.last_insert_id=row->last_insert_id;
    thd.last_insert_id_used=row->last_insert_id_used;
    thd.insert_id_used=row->insert_id_used;
    table->timestamp_default_now= row->timestamp_default_now;
    table->timestamp_on_update_now= row->timestamp_on_update_now;

    info.handle_duplicates= row->dup;
    if (info.handle_duplicates == DUP_IGNORE ||
	info.handle_duplicates == DUP_REPLACE)
    {
      table->file->extra(HA_EXTRA_IGNORE_DUP_KEY);
      using_ignore=1;
    }
    thd.clear_error(); // reset error for binlog
    if (write_record(table,&info))
    {
      info.error_count++;				// Ignore errors
      thread_safe_increment(delayed_insert_errors,&LOCK_delayed_status);
      row->log_query = 0;
    }
    if (using_ignore)
    {
      using_ignore=0;
      table->file->extra(HA_EXTRA_NO_IGNORE_DUP_KEY);
    }
    if (row->query && row->log_query && using_bin_log)
    {
      Query_log_event qinfo(&thd, row->query, row->query_length,0);
      mysql_bin_log.write(&qinfo);
    }
    if (table->blob_fields)
      free_delayed_insert_blobs(table);
    thread_safe_sub(delayed_rows_in_use,1,&LOCK_delayed_status);
    thread_safe_increment(delayed_insert_writes,&LOCK_delayed_status);
    pthread_mutex_lock(&mutex);

    delete row;
    /*
      Let READ clients do something once in a while
      We should however not break in the middle of a multi-line insert
      if we have binary logging enabled as we don't want other commands
      on this table until all entries has been processed
    */
    if (group_count++ >= max_rows && (row= rows.head()) &&
	(!(row->log_query & using_bin_log) ||
	 row->query))
    {
      group_count=0;
      if (stacked_inserts || tables_in_use)	// Let these wait a while
      {
	if (tables_in_use)
	  pthread_cond_broadcast(&cond_client); // If waiting clients
	thd.proc_info="reschedule";
	pthread_mutex_unlock(&mutex);
	if ((error=table->file->extra(HA_EXTRA_NO_CACHE)))
	{
	  /* This should never happen */
	  table->file->print_error(error,MYF(0));
	  sql_print_error("%s",thd.net.last_error);
	  goto err;
	}
	query_cache_invalidate3(&thd, table, 1);
	if (thr_reschedule_write_lock(*thd.lock->locks))
	{
	  /* This should never happen */
	  sql_print_error(ER(ER_DELAYED_CANT_CHANGE_LOCK),table->real_name);
	}
	if (!using_bin_log)
	  table->file->extra(HA_EXTRA_WRITE_CACHE);
	pthread_mutex_lock(&mutex);
	thd.proc_info="insert";
      }
      if (tables_in_use)
	pthread_cond_broadcast(&cond_client);	// If waiting clients
    }
  }

  thd.proc_info=0;
  table->next_number_field=0;
  pthread_mutex_unlock(&mutex);
  if ((error=table->file->extra(HA_EXTRA_NO_CACHE)))
  {						// This shouldn't happen
    table->file->print_error(error,MYF(0));
    sql_print_error("%s",thd.net.last_error);
    goto err;
  }
  query_cache_invalidate3(&thd, table, 1);
  pthread_mutex_lock(&mutex);
  DBUG_RETURN(0);

 err:
  /* Remove all not used rows */
  while ((row=rows.get()))
  {
    delete row;
    thread_safe_increment(delayed_insert_errors,&LOCK_delayed_status);
    stacked_inserts--;
  }
  thread_safe_increment(delayed_insert_errors, &LOCK_delayed_status);
  pthread_mutex_lock(&mutex);
  DBUG_RETURN(1);
}
#endif /* EMBEDDED_LIBRARY */

/***************************************************************************
  Store records in INSERT ... SELECT *
***************************************************************************/


/*
  make insert specific preparation and checks after opening tables

  SYNOPSIS
    mysql_insert_select_prepare()
    thd         thread handler

  RETURN
    0   OK
    -1  Error
*/

int mysql_insert_select_prepare(THD *thd)
{
  LEX *lex= thd->lex;
  DBUG_ENTER("mysql_insert_select_prepare");
  if (mysql_prepare_insert_check_table(thd, lex->query_tables,
                                       lex->field_list,
                                       &lex->select_lex.where))
    DBUG_RETURN(-1);
  DBUG_RETURN(0);
}


int
select_insert::prepare(List<Item> &values, SELECT_LEX_UNIT *u)
{
  DBUG_ENTER("select_insert::prepare");

  unit= u;
  if (check_insert_fields(thd, table_list, *fields, values, 1,
                          !insert_into_view))
    DBUG_RETURN(1);

  restore_record(table,default_values);			// Get empty record
  table->next_number_field=table->found_next_number_field;
  thd->count_cuted_fields= CHECK_FIELD_WARN;		// calc cuted fields
  thd->cuted_fields=0;
  if (info.handle_duplicates == DUP_IGNORE ||
      info.handle_duplicates == DUP_REPLACE)
    table->file->extra(HA_EXTRA_IGNORE_DUP_KEY);
  table->file->start_bulk_insert((ha_rows) 0);
  DBUG_RETURN(0);
}

select_insert::~select_insert()
{
  if (table)
  {
    table->next_number_field=0;
    table->file->reset();
  }
  thd->count_cuted_fields= CHECK_FIELD_IGNORE;
}


bool select_insert::send_data(List<Item> &values)
{
  DBUG_ENTER("select_insert::send_data");
  if (unit->offset_limit_cnt)
  {						// using limit offset,count
    unit->offset_limit_cnt--;
    DBUG_RETURN(0);
  }
  if (fields->elements)
    fill_record(*fields, values, 1);
  else
    fill_record(table->field, values, 1);
  if (thd->net.report_error || write_record(table,&info))
    DBUG_RETURN(1);
  if (table->next_number_field)		// Clear for next record
  {
    table->next_number_field->reset();
    if (! last_insert_id && thd->insert_id_used)
      last_insert_id=thd->insert_id();
  }
  DBUG_RETURN(0);
}


void select_insert::send_error(uint errcode,const char *err)
{
  DBUG_ENTER("select_insert::send_error");

  /* TODO error should be sent at the query processing end */
  ::send_error(thd,errcode,err);

  if (!table)
  {
    /*
      This can only happen when using CREATE ... SELECT and the table was not
      created becasue of an syntax error
    */
    DBUG_VOID_RETURN;
  }
  table->file->end_bulk_insert();
  /*
    If at least one row has been inserted/modified and will stay in the table
    (the table doesn't have transactions) (example: we got a duplicate key
    error while inserting into a MyISAM table) we must write to the binlog (and
    the error code will make the slave stop).
  */
  if ((info.copied || info.deleted || info.updated) &&
      !table->file->has_transactions())
  {
    if (last_insert_id)
      thd->insert_id(last_insert_id);		// For binary log
    if (mysql_bin_log.is_open())
    {
      Query_log_event qinfo(thd, thd->query, thd->query_length,
                            table->file->has_transactions());
      mysql_bin_log.write(&qinfo);
    }
    if (!table->tmp_table)
      thd->options|=OPTION_STATUS_NO_TRANS_UPDATE;
  }
  if (info.copied || info.deleted || info.updated)
  {
    query_cache_invalidate3(thd, table, 1);
  }
  ha_rollback_stmt(thd);
  DBUG_VOID_RETURN;
}


bool select_insert::send_eof()
{
  int error,error2;
  DBUG_ENTER("select_insert::send_eof");

  error=table->file->end_bulk_insert();
  table->file->extra(HA_EXTRA_NO_IGNORE_DUP_KEY);

  /*
    We must invalidate the table in the query cache before binlog writing
    and ha_autocommit_...
  */

  if (info.copied || info.deleted || info.updated)
  {
    query_cache_invalidate3(thd, table, 1);
    if (!(table->file->has_transactions() || table->tmp_table))
      thd->options|=OPTION_STATUS_NO_TRANS_UPDATE;
  }

  if (last_insert_id)
    thd->insert_id(last_insert_id);		// For binary log
  /* Write to binlog before commiting transaction */
  if (mysql_bin_log.is_open())
  {
    if (!error)
      thd->clear_error();
    Query_log_event qinfo(thd, thd->query, thd->query_length,
			  table->file->has_transactions());
    mysql_bin_log.write(&qinfo);
  }
  if ((error2=ha_autocommit_or_rollback(thd,error)) && ! error)
    error=error2;
  if (error)
  {
    table->file->print_error(error,MYF(0));
    //TODO error should be sent at the query processing end
    ::send_error(thd);
    DBUG_RETURN(1);
  }
  char buff[160];
  if (info.handle_duplicates == DUP_IGNORE)
    sprintf(buff, ER(ER_INSERT_INFO), (ulong) info.records,
	    (ulong) (info.records - info.copied), (ulong) thd->cuted_fields);
  else
    sprintf(buff, ER(ER_INSERT_INFO), (ulong) info.records,
	    (ulong) (info.deleted+info.updated), (ulong) thd->cuted_fields);
  thd->row_count_func= info.copied+info.deleted+info.updated;
  ::send_ok(thd, (ulong) thd->row_count_func, last_insert_id, buff);
  DBUG_RETURN(0);
}


/***************************************************************************
  CREATE TABLE (SELECT) ...
***************************************************************************/

int
select_create::prepare(List<Item> &values, SELECT_LEX_UNIT *u)
{
  DBUG_ENTER("select_create::prepare");

  unit= u;
  table= create_table_from_items(thd, create_info, create_table,
				 extra_fields, keys, &values, &lock);
  if (!table)
    DBUG_RETURN(-1);				// abort() deletes table

  if (table->fields < values.elements)
  {
    my_printf_error(ER_WRONG_VALUE_COUNT_ON_ROW,
                    ER(ER_WRONG_VALUE_COUNT_ON_ROW),
		    MYF(0),1);
    DBUG_RETURN(-1);
  }

  /* First field to copy */
  field=table->field+table->fields - values.elements;

  /* Don't set timestamp if used */
  table->timestamp_default_now= table->timestamp_on_update_now= 0;

  table->next_number_field=table->found_next_number_field;

  restore_record(table,default_values);			// Get empty record
  thd->count_cuted_fields= CHECK_FIELD_WARN;		// count warnings
  thd->cuted_fields=0;
  if (info.handle_duplicates == DUP_IGNORE ||
      info.handle_duplicates == DUP_REPLACE)
    table->file->extra(HA_EXTRA_IGNORE_DUP_KEY);
  table->file->start_bulk_insert((ha_rows) 0);
  DBUG_RETURN(0);
}


bool select_create::send_data(List<Item> &values)
{
  if (unit->offset_limit_cnt)
  {						// using limit offset,count
    unit->offset_limit_cnt--;
    return 0;
  }
  fill_record(field, values, 1);
  if (thd->net.report_error ||write_record(table,&info))
    return 1;
  if (table->next_number_field)		// Clear for next record
  {
    table->next_number_field->reset();
    if (! last_insert_id && thd->insert_id_used)
      last_insert_id=thd->insert_id();
  }
  return 0;
}


bool select_create::send_eof()
{
  bool tmp=select_insert::send_eof();
  if (tmp)
    abort();
  else
  {
    table->file->extra(HA_EXTRA_NO_IGNORE_DUP_KEY);
    VOID(pthread_mutex_lock(&LOCK_open));
    mysql_unlock_tables(thd, lock);
    /*
      TODO:
      Check if we can remove the following two rows.
      We should be able to just keep the table in the table cache.
    */
    if (!table->tmp_table)
      hash_delete(&open_cache,(byte*) table);
    lock=0;
    table=0;
    VOID(pthread_mutex_unlock(&LOCK_open));
  }
  return tmp;
}

void select_create::abort()
{
  VOID(pthread_mutex_lock(&LOCK_open));
  if (lock)
  {
    mysql_unlock_tables(thd, lock);
    lock=0;
  }
  if (table)
  {
    table->file->extra(HA_EXTRA_NO_IGNORE_DUP_KEY);
    enum db_type table_type=table->db_type;
    if (!table->tmp_table)
    {
      hash_delete(&open_cache,(byte*) table);
      if (!create_info->table_existed)
        quick_rm_table(table_type, create_table->db, create_table->real_name);
    }
    else if (!create_info->table_existed)
      close_temporary_table(thd, create_table->db, create_table->real_name);
    table=0;
  }
  VOID(pthread_mutex_unlock(&LOCK_open));
}


/*****************************************************************************
  Instansiate templates
*****************************************************************************/

#ifdef __GNUC__
template class List_iterator_fast<List_item>;
#ifndef EMBEDDED_LIBRARY
template class I_List<delayed_insert>;
template class I_List_iterator<delayed_insert>;
template class I_List<delayed_row>;
#endif /* EMBEDDED_LIBRARY */
#endif /* __GNUC__ */