File: myrg_close.c

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/* Copyright (c) 2000, 2001, 2005-2007 MySQL 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; 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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA */

/* close a isam-database */

#include "myrg_def.h"

int myrg_close(MYRG_INFO *info)
{
  int error=0,new_error;
  MYRG_TABLE *file;
  DBUG_ENTER("myrg_close");

  /*
    Assume that info->children_attached means that this is called from
    direct use of MERGE, not from a MySQL server. In this case the
    children must be closed and info->rec_per_key_part is part of the
    'info' multi_alloc.
    If info->children_attached is false, this is called from a MySQL
    server. Children are closed independently but info->rec_per_key_part
    must be freed.
    Just in case of a server panic (myrg_panic()) info->children_attached
    might be true. We would close the children though they should be
    closed independently and info->rec_per_key_part is not freed.
    This should be acceptable for a panic.
    In case of a MySQL server and no children, children_attached is
    always true. In this case no rec_per_key_part has been allocated.
    So it is correct to use the branch where an empty list of tables is
    (not) closed.
  */
  if (info->children_attached)
  {
    for (file= info->open_tables; file != info->end_table; file++)
    {
      /* purecov: begin inspected */
      if ((new_error= mi_close(file->table)))
        error= new_error;
      else
        file->table= NULL;
      /* purecov: end */
    }
  }
  else
    my_free((uchar*) info->rec_per_key_part, MYF(MY_ALLOW_ZERO_PTR));
  delete_queue(&info->by_key);
  pthread_mutex_lock(&THR_LOCK_open);
  myrg_open_list=list_delete(myrg_open_list,&info->open_list);
  pthread_mutex_unlock(&THR_LOCK_open);
  VOID(pthread_mutex_destroy(&info->mutex));
  my_free((uchar*) info,MYF(0));
  if (error)
  {
    DBUG_RETURN(my_errno=error);
  }
  DBUG_RETURN(0);
}