text: /* Copyright (C) 2000 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
  
  /* This file should be included when using merge_isam_funktions */
  
  #ifndef _myisammrg_h
  #define _myisammrg_h
  #ifdef	__cplusplus
  extern "C" {
  #endif
  
  #ifndef _my_base_h
  #include <my_base.h>
  #endif
  #ifndef _myisam_h
  #include <myisam.h>
  #endif
  
  #include <queues.h>
  
  #define MYRG_NAME_EXT	".MRG"
  
  /* In which table to INSERT rows */
  #define MERGE_INSERT_DISABLED	0
  #define MERGE_INSERT_TO_FIRST	1
  #define MERGE_INSERT_TO_LAST	2
  
  extern TYPELIB merge_insert_method;
  
  	/* Param to/from myrg_info */
  
  typedef struct st_mymerge_info		/* Struct from h_info */
  {
    ulonglong records;			/* Records in database */
    ulonglong deleted;			/* Deleted records in database */
    ulonglong recpos;			/* Pos for last used record */
    ulonglong data_file_length;
    uint	reclength;			/* Recordlength */
    int	errkey;				/* With key was dupplicated on err */
    uint	options;			/* HA_OPTION_... used */
    ulong *rec_per_key;			/* for sql optimizing */
  } MYMERGE_INFO;
  
  typedef struct st_myrg_table_info
  {
    struct st_myisam_info *table;
    ulonglong file_offset;
  } MYRG_TABLE;
  
  typedef struct st_myrg_info
  {
    MYRG_TABLE *open_tables,*current_table,*end_table,*last_used_table;
    ulonglong records;			/* records in tables */
    ulonglong del;			/* Removed records */
    ulonglong data_file_length;
    ulong  cache_size;
    uint	 merge_insert_method;
    uint	 tables,options,reclength,keys;
    my_bool cache_in_use;
    /* If MERGE children attached to parent. See top comment in ha_myisammrg.cc */
    my_bool children_attached;
    LIST	 open_list;
    QUEUE  by_key;
    ulong *rec_per_key_part;			/* for sql optimizing */
    pthread_mutex_t mutex;
  } MYRG_INFO;
  
  
  	/* Prototypes for merge-functions */
  
  extern int myrg_close(MYRG_INFO *file);
  extern int myrg_delete(MYRG_INFO *file,const uchar *buff);
  extern MYRG_INFO *myrg_open(const char *name,int mode,int wait_if_locked);
  extern MYRG_INFO *myrg_parent_open(const char *parent_name,
                                     int (*callback)(void*, const char*),
                                     void *callback_param);
  extern int myrg_attach_children(MYRG_INFO *m_info, int handle_locking,
                                  MI_INFO *(*callback)(void*),
                                  void *callback_param,
                                  my_bool *need_compat_check);
  extern int myrg_detach_children(MYRG_INFO *m_info);
  extern int myrg_panic(enum ha_panic_function function);
  extern int myrg_rfirst(MYRG_INFO *file,uchar *buf,int inx);
  extern int myrg_rlast(MYRG_INFO *file,uchar *buf,int inx);
  extern int myrg_rnext(MYRG_INFO *file,uchar *buf,int inx);
  extern int myrg_rprev(MYRG_INFO *file,uchar *buf,int inx);
  extern int myrg_rnext_same(MYRG_INFO *file,uchar *buf);
  extern int myrg_rkey(MYRG_INFO *info,uchar *buf,int inx, const uchar *key,
                       key_part_map keypart_map, enum ha_rkey_function search_flag);
  extern int myrg_rrnd(MYRG_INFO *file,uchar *buf,ulonglong pos);
  extern int myrg_rsame(MYRG_INFO *file,uchar *record,int inx);
  extern int myrg_update(MYRG_INFO *file,const uchar *old,uchar *new_rec);
  extern int myrg_write(MYRG_INFO *info,uchar *rec);
  extern int myrg_status(MYRG_INFO *file,MYMERGE_INFO *x,int flag);
  extern int myrg_lock_database(MYRG_INFO *file,int lock_type);
  extern int myrg_create(const char *name, const char **table_names,
                         uint insert_method, my_bool fix_names);
  extern int myrg_extra(MYRG_INFO *file,enum ha_extra_function function,
  		      void *extra_arg);
  extern int myrg_reset(MYRG_INFO *info);
  extern void myrg_extrafunc(MYRG_INFO *info,invalidator_by_filename inv);
  extern ha_rows myrg_records_in_range(MYRG_INFO *info, int inx,
                                       key_range *min_key, key_range *max_key);
  extern ha_rows myrg_records(MYRG_INFO *info);
  
  extern ulonglong myrg_position(MYRG_INFO *info);
  #ifdef	__cplusplus
  }
  #endif
  #endif
  