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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; 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 heap_database_funktions */
/* Author: Michael Widenius */
#ifndef _heap_h
#define _heap_h
#ifdef __cplusplus
extern "C" {
#endif
#ifndef _my_base_h
#include <my_base.h>
#endif
#ifdef THREAD
#include <my_pthread.h>
#include <thr_lock.h>
#endif
/* defines used by heap-funktions */
#define HP_MAX_LEVELS 4 /* 128^5 records is enough */
#define HP_PTRS_IN_NOD 128
/* struct used with heap_funktions */
typedef struct st_heapinfo /* Struct from heap_info */
{
ulong records; /* Records in database */
ulong deleted; /* Deleted records in database */
ulong max_records;
ulong data_length;
ulong index_length;
uint reclength; /* Length of one record */
int errkey;
} HEAPINFO;
/* Structs used by heap-database-handler */
typedef struct st_heap_ptrs
{
byte *blocks[HP_PTRS_IN_NOD]; /* pointers to HP_PTRS or records */
} HP_PTRS;
struct st_level_info
{
uint free_ptrs_in_block,records_under_level;
HP_PTRS *last_blocks; /* pointers to HP_PTRS or records */
};
typedef struct st_heap_block /* The data is saved in blocks */
{
HP_PTRS *root;
struct st_level_info level_info[HP_MAX_LEVELS+1];
uint levels;
uint records_in_block; /* Records in a heap-block */
uint recbuffer; /* Length of one saved record */
ulong last_allocated; /* Blocks allocated, used by keys */
} HP_BLOCK;
typedef struct st_hp_keyseg /* Key-portion */
{
uint start; /* Start of key in record (from 0) */
uint length; /* Keylength */
uint type;
} HP_KEYSEG;
typedef struct st_hp_keydef /* Key definition with open */
{
uint flag; /* NOSAME */
uint keysegs; /* Number of key-segment */
uint length; /* Length of key (automatic) */
HP_KEYSEG *seg;
HP_BLOCK block; /* Where keys are saved */
} HP_KEYDEF;
typedef struct st_heap_share
{
HP_BLOCK block;
HP_KEYDEF *keydef;
ulong min_records,max_records; /* Params to open */
ulong data_length,index_length;
uint records; /* records */
uint blength;
uint deleted; /* Deleted records in database */
uint reclength; /* Length of one record */
uint changed;
uint keys,max_key_length;
uint open_count;
byte *del_link; /* Link to next block with del. rec */
my_string name; /* Name of "memory-file" */
#ifdef THREAD
THR_LOCK lock;
pthread_mutex_t intern_lock; /* Locking for use with _locking */
#endif
my_bool delete_on_close;
LIST open_list;
} HP_SHARE;
struct st_hp_hash_info;
typedef struct st_heap_info
{
HP_SHARE *s;
byte *current_ptr;
struct st_hp_hash_info *current_hash_ptr;
ulong current_record,next_block;
int lastinx,errkey;
int mode; /* Mode of file (READONLY..) */
uint opt_flag,update;
byte *lastkey; /* Last used key with rkey */
#ifdef THREAD
THR_LOCK_DATA lock;
#endif
LIST open_list;
} HP_INFO;
/* Prototypes for heap-functions */
extern HP_INFO* heap_open(const char *name,int mode,uint keys,
HP_KEYDEF *keydef,uint reclength,
ulong max_records,ulong min_reloc);
extern int heap_close(HP_INFO *info);
extern int heap_write(HP_INFO *info,const byte *buff);
extern int heap_update(HP_INFO *info,const byte *old,const byte *newdata);
extern int heap_rrnd(HP_INFO *info,byte *buf,byte *pos);
extern int heap_scan_init(HP_INFO *info);
extern int heap_scan(register HP_INFO *info, byte *record);
extern int heap_delete(HP_INFO *info,const byte *buff);
extern int heap_info(HP_INFO *info,HEAPINFO *x,int flag);
extern int heap_create(const char *name);
extern int heap_delete_table(const char *name);
extern int heap_extra(HP_INFO *info,enum ha_extra_function function);
extern int heap_rename(const char *old_name,const char *new_name);
extern int heap_panic(enum ha_panic_function flag);
extern int heap_rsame(HP_INFO *info,byte *record,int inx);
extern int heap_rnext(HP_INFO *info,byte *record);
extern int heap_rprev(HP_INFO *info,byte *record);
extern int heap_rfirst(HP_INFO *info,byte *record);
extern int heap_rlast(HP_INFO *info,byte *record);
extern void heap_clear(HP_INFO *info);
extern int heap_rkey(HP_INFO *info,byte *record,int inx,const byte *key);
extern gptr heap_find(HP_INFO *info,int inx,const byte *key);
extern int heap_check_heap(HP_INFO *info, my_bool print_status);
extern byte *heap_position(HP_INFO *info);
/* The following is for programs that uses the old HEAP interface where
pointer to rows where a long instead of a (byte*).
*/
#if defined(WANT_OLD_HEAP_VERSION) || defined(OLD_HEAP_VERSION)
extern int heap_rrnd_old(HP_INFO *info,byte *buf,ulong pos);
extern ulong heap_position_old(HP_INFO *info);
#endif
#ifdef OLD_HEAP_VERSION
typedef ulong HEAP_PTR;
#define heap_position(A) heap_position_old(A)
#define heap_rrnd(A,B,C) heap_rrnd_old(A,B,C)
#else
typedef byte *HEAP_PTR;
#endif
#ifdef __cplusplus
}
#endif
#endif
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