heapdef.h
上传用户:romrleung
上传日期:2022-05-23
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文件大小:4k
- /* Copyright (C) 2000,2004 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 */
- /* This file is included in all heap-files */
- #include <my_base.h> /* This includes global */
- #ifdef THREAD
- #include <my_pthread.h>
- #endif
- #include "heap.h" /* Structs & some defines */
- #include "my_tree.h"
- /*
- When allocating keys /rows in the internal block structure, do it
- within the following boundaries.
- The challenge is to find the balance between allocate as few blocks
- as possible and keep memory consumption down.
- */
- #define HP_MIN_RECORDS_IN_BLOCK 16
- #define HP_MAX_RECORDS_IN_BLOCK 8192
- /* Some extern variables */
- extern LIST *heap_open_list,*heap_share_list;
- #define test_active(info)
- if (!(info->update & HA_STATE_AKTIV))
- { my_errno=HA_ERR_NO_ACTIVE_RECORD; DBUG_RETURN(-1); }
- #define hp_find_hash(A,B) ((HASH_INFO*) hp_find_block((A),(B)))
- /* Find pos for record and update it in info->current_ptr */
- #define hp_find_record(info,pos) (info)->current_ptr= hp_find_block(&(info)->s->block,pos)
- typedef struct st_hp_hash_info
- {
- struct st_hp_hash_info *next_key;
- byte *ptr_to_rec;
- } HASH_INFO;
- typedef struct {
- HA_KEYSEG *keyseg;
- uint key_length;
- uint search_flag;
- } heap_rb_param;
-
- /* Prototypes for intern functions */
- extern HP_SHARE *hp_find_named_heap(const char *name);
- extern int hp_rectest(HP_INFO *info,const byte *old);
- extern byte *hp_find_block(HP_BLOCK *info,ulong pos);
- extern int hp_get_new_block(HP_BLOCK *info, ulong* alloc_length);
- extern void hp_free(HP_SHARE *info);
- extern byte *hp_free_level(HP_BLOCK *block,uint level,HP_PTRS *pos,
- byte *last_pos);
- extern int hp_write_key(HP_INFO *info, HP_KEYDEF *keyinfo,
- const byte *record, byte *recpos);
- extern int hp_rb_write_key(HP_INFO *info, HP_KEYDEF *keyinfo,
- const byte *record, byte *recpos);
- extern int hp_rb_delete_key(HP_INFO *info,HP_KEYDEF *keyinfo,
- const byte *record,byte *recpos,int flag);
- extern int hp_delete_key(HP_INFO *info,HP_KEYDEF *keyinfo,
- const byte *record,byte *recpos,int flag);
- extern HASH_INFO *_heap_find_hash(HP_BLOCK *block,ulong pos);
- extern byte *hp_search(HP_INFO *info,HP_KEYDEF *keyinfo,const byte *key,
- uint nextflag);
- extern byte *hp_search_next(HP_INFO *info, HP_KEYDEF *keyinfo,
- const byte *key, HASH_INFO *pos);
- extern ulong hp_hashnr(HP_KEYDEF *keyinfo,const byte *key);
- extern ulong hp_rec_hashnr(HP_KEYDEF *keyinfo,const byte *rec);
- extern ulong hp_mask(ulong hashnr,ulong buffmax,ulong maxlength);
- extern void hp_movelink(HASH_INFO *pos,HASH_INFO *next_link,
- HASH_INFO *newlink);
- extern int hp_rec_key_cmp(HP_KEYDEF *keydef,const byte *rec1,
- const byte *rec2);
- extern int hp_key_cmp(HP_KEYDEF *keydef,const byte *rec,
- const byte *key);
- extern void hp_make_key(HP_KEYDEF *keydef,byte *key,const byte *rec);
- extern uint hp_rb_make_key(HP_KEYDEF *keydef, byte *key,
- const byte *rec, byte *recpos);
- extern uint hp_rb_key_length(HP_KEYDEF *keydef, const byte *key);
- extern uint hp_rb_null_key_length(HP_KEYDEF *keydef, const byte *key);
- extern my_bool hp_if_null_in_key(HP_KEYDEF *keyinfo, const byte *record);
- extern int hp_close(register HP_INFO *info);
- extern void hp_clear(HP_SHARE *info);
- extern void hp_clear_keys(HP_SHARE *info);
- extern uint hp_rb_pack_key(HP_KEYDEF *keydef, uchar *key, const uchar *old,
- uint k_len);
- #ifdef THREAD
- extern pthread_mutex_t THR_LOCK_heap;
- #else
- #define pthread_mutex_lock(A)
- #define pthread_mutex_unlock(A)
- #endif