1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
|
/* Copyright (c) 2000, 2011, Oracle and/or its affiliates.
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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* This file should be included when using heap_database_functions */
/* Author: Michael Widenius */
#ifndef _heap_h
#define _heap_h
#ifdef __cplusplus
extern "C" {
#endif
#ifndef _my_base_h
#include <my_base.h>
#endif
#include <my_pthread.h>
#include <thr_lock.h>
#include "my_compare.h"
#include "my_tree.h"
/* 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;
ulonglong data_length;
ulonglong index_length;
uint reclength; /* Length of one record */
int errkey;
ulonglong auto_increment;
time_t create_time;
} HEAPINFO;
/* Structs used by heap-database-handler */
typedef struct st_heap_ptrs
{
uchar *blocks[HP_PTRS_IN_NOD]; /* pointers to HP_PTRS or records */
} HP_PTRS;
struct st_level_info
{
/* Number of unused slots in *last_blocks HP_PTRS block (0 for 0th level) */
uint free_ptrs_in_block;
/*
Maximum number of records that can be 'contained' inside of each element
of last_blocks array. For level 0 - 1, for level 1 - HP_PTRS_IN_NOD, for
level 2 - HP_PTRS_IN_NOD^2 and so forth.
*/
ulong records_under_level;
/*
Ptr to last allocated HP_PTRS (or records buffer for level 0) on this
level.
*/
HP_PTRS *last_blocks;
};
/*
Heap table records and hash index entries are stored in HP_BLOCKs.
HP_BLOCK is used as a 'growable array' of fixed-size records. Size of record
is recbuffer bytes.
The internal representation is as follows:
HP_BLOCK is a hierarchical structure of 'blocks'.
A block at level 0 is an array records_in_block records.
A block at higher level is an HP_PTRS structure with pointers to blocks at
lower levels.
At the highest level there is one top block. It is stored in HP_BLOCK::root.
See hp_find_block for a description of how record pointer is obtained from
its index.
See hp_get_new_block
*/
typedef struct st_heap_block
{
HP_PTRS *root; /* Top-level block */
struct st_level_info level_info[HP_MAX_LEVELS+1];
uint levels; /* number of used levels */
uint recbuffer; /* Length of one saved record */
ulong records_in_block; /* Records in one heap-block */
ulong last_allocated; /* number of records there is allocated space for */
} HP_BLOCK;
struct st_heap_info; /* For referense */
typedef struct st_hp_keydef /* Key definition with open */
{
uint flag; /* HA_NOSAME | HA_NULL_PART_KEY */
uint keysegs; /* Number of key-segment */
uint length; /* Length of key (automatic) */
uint8 algorithm; /* HASH / BTREE */
HA_KEYSEG *seg;
HP_BLOCK block; /* Where keys are saved */
/*
Number of buckets used in hash table. Used only to provide
#records estimates for heap key scans.
*/
ha_rows hash_buckets;
TREE rb_tree;
int (*write_key)(struct st_heap_info *info, struct st_hp_keydef *keyinfo,
const uchar *record, uchar *recpos);
int (*delete_key)(struct st_heap_info *info, struct st_hp_keydef *keyinfo,
const uchar *record, uchar *recpos, int flag);
uint (*get_key_length)(struct st_hp_keydef *keydef, const uchar *key);
} HP_KEYDEF;
typedef struct st_heap_share
{
HP_BLOCK block;
HP_KEYDEF *keydef;
ulonglong data_length,index_length,max_table_size;
ulonglong auto_increment;
ulong min_records,max_records; /* Params to open */
ulong records; /* records */
ulong blength; /* records rounded up to 2^n */
ulong deleted; /* Deleted records in database */
uint key_stat_version; /* version to indicate insert/delete */
uint key_version; /* Updated on key change */
uint file_version; /* Update on clear */
uint reclength; /* Length of one record */
uint visible; /* Offset to the visible/deleted mark */
uint changed;
uint keys,max_key_length;
uint currently_disabled_keys; /* saved value from "keys" when disabled */
uint open_count;
uchar *del_link; /* Link to next block with del. rec */
char * name; /* Name of "memory-file" */
time_t create_time;
THR_LOCK lock;
mysql_mutex_t intern_lock; /* Locking for use with _locking */
my_bool delete_on_close;
LIST open_list;
uint auto_key;
uint auto_key_type; /* real type of the auto key segment */
} HP_SHARE;
struct st_hp_hash_info;
typedef struct st_heap_info
{
HP_SHARE *s;
uchar *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;
uchar *lastkey; /* Last used key with rkey */
uchar *recbuf; /* Record buffer for rb-tree keys */
enum ha_rkey_function last_find_flag;
TREE_ELEMENT *parents[MAX_TREE_HEIGHT+1];
TREE_ELEMENT **last_pos;
uint key_version; /* Version at last read */
uint file_version; /* Version at scan */
uint lastkey_len;
my_bool implicit_emptied;
THR_LOCK_DATA lock;
LIST open_list;
} HP_INFO;
typedef struct st_heap_create_info
{
HP_KEYDEF *keydef;
uint auto_key; /* keynr [1 - maxkey] for auto key */
uint auto_key_type;
uint keys;
uint reclength;
ulong max_records;
ulong min_records;
ulonglong max_table_size;
ulonglong auto_increment;
my_bool with_auto_increment;
my_bool internal_table;
/*
TRUE if heap_create should 'pin' the created share by setting
open_count to 1. Is only looked at if not internal_table.
*/
my_bool pin_share;
} HP_CREATE_INFO;
/* Prototypes for heap-functions */
extern HP_INFO *heap_open(const char *name, int mode);
extern HP_INFO *heap_open_from_share(HP_SHARE *share, int mode);
extern HP_INFO *heap_open_from_share_and_register(HP_SHARE *share, int mode);
extern void heap_release_share(HP_SHARE *share, my_bool internal_table);
extern int heap_close(HP_INFO *info);
extern int heap_write(HP_INFO *info,const uchar *buff);
extern int heap_update(HP_INFO *info,const uchar *old,const uchar *newdata);
extern int heap_rrnd(HP_INFO *info,uchar *buf,uchar *pos);
extern int heap_scan_init(HP_INFO *info);
extern int heap_scan(register HP_INFO *info, uchar *record);
extern int heap_delete(HP_INFO *info,const uchar *buff);
extern int heap_info(HP_INFO *info,HEAPINFO *x,int flag);
extern int heap_create(const char *name,
HP_CREATE_INFO *create_info, HP_SHARE **share,
my_bool *created_new_share);
extern int heap_delete_table(const char *name);
extern void heap_drop_table(HP_INFO *info);
extern int heap_extra(HP_INFO *info,enum ha_extra_function function);
extern int heap_reset(HP_INFO *info);
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,uchar *record,int inx);
extern int heap_rnext(HP_INFO *info,uchar *record);
extern int heap_rprev(HP_INFO *info,uchar *record);
extern int heap_rfirst(HP_INFO *info,uchar *record,int inx);
extern int heap_rlast(HP_INFO *info,uchar *record,int inx);
extern void heap_clear(HP_INFO *info);
extern void heap_clear_keys(HP_INFO *info);
extern int heap_disable_indexes(HP_INFO *info);
extern int heap_enable_indexes(HP_INFO *info);
extern int heap_indexes_are_disabled(HP_INFO *info);
extern void heap_update_auto_increment(HP_INFO *info, const uchar *record);
ha_rows hp_rb_records_in_range(HP_INFO *info, int inx, key_range *min_key,
key_range *max_key);
int hp_panic(enum ha_panic_function flag);
int heap_rkey(HP_INFO *info, uchar *record, int inx, const uchar *key,
key_part_map keypart_map, enum ha_rkey_function find_flag);
extern uchar * heap_find(HP_INFO *info,int inx,const uchar *key);
extern int heap_check_heap(HP_INFO *info, my_bool print_status);
extern uchar *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 (uchar*).
*/
#if defined(WANT_OLD_HEAP_VERSION) || defined(OLD_HEAP_VERSION)
extern int heap_rrnd_old(HP_INFO *info,uchar *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 uchar *HEAP_PTR;
#endif
#ifdef __cplusplus
}
#endif
#endif
|
