~drizzle-trunk/drizzle/development

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
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
/*****************************************************************************

Copyright (C) 1997, 2009, Innobase Oy. All Rights Reserved.

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

*****************************************************************************/

/**************************************************//**
@file include/hash0hash.h
The simple hash table utility

Created 5/20/1997 Heikki Tuuri
*******************************************************/

#ifndef hash0hash_h
#define hash0hash_h

#include "univ.i"
#include "mem0mem.h"
#ifndef UNIV_HOTBACKUP
# include "sync0sync.h"
#endif /* !UNIV_HOTBACKUP */

typedef struct hash_table_struct hash_table_t;
typedef struct hash_cell_struct hash_cell_t;

typedef void*	hash_node_t;

/* Fix Bug #13859: symbol collision between imap/mysql */
#define hash_create hash0_create

/*************************************************************//**
Creates a hash table with >= n array cells. The actual number
of cells is chosen to be a prime number slightly bigger than n.
@return	own: created table */
UNIV_INTERN
hash_table_t*
hash_create(
/*========*/
	ulint	n);	/*!< in: number of array cells */
#ifndef UNIV_HOTBACKUP
/*************************************************************//**
Creates a mutex array to protect a hash table. */
UNIV_INTERN
void
hash_create_mutexes_func(
/*=====================*/
	hash_table_t*	table,		/*!< in: hash table */
#ifdef UNIV_SYNC_DEBUG
	ulint		sync_level,	/*!< in: latching order level of the
					mutexes: used in the debug version */
#endif /* UNIV_SYNC_DEBUG */
	ulint		n_mutexes);	/*!< in: number of mutexes */
#ifdef UNIV_SYNC_DEBUG
# define hash_create_mutexes(t,n,level) hash_create_mutexes_func(t,level,n)
#else /* UNIV_SYNC_DEBUG */
# define hash_create_mutexes(t,n,level) hash_create_mutexes_func(t,n)
#endif /* UNIV_SYNC_DEBUG */
#endif /* !UNIV_HOTBACKUP */

/*************************************************************//**
Frees a hash table. */
UNIV_INTERN
void
hash_table_free(
/*============*/
	hash_table_t*	table);	/*!< in, own: hash table */
/**************************************************************//**
Calculates the hash value from a folded value.
@return	hashed value */
UNIV_INLINE
ulint
hash_calc_hash(
/*===========*/
	ulint		fold,	/*!< in: folded value */
	hash_table_t*	table);	/*!< in: hash table */
#ifndef UNIV_HOTBACKUP
/********************************************************************//**
Assert that the mutex for the table in a hash operation is owned. */
# define HASH_ASSERT_OWNED(TABLE, FOLD)					\
ut_ad(!(TABLE)->mutexes || mutex_own(hash_get_mutex(TABLE, FOLD)));
#else /* !UNIV_HOTBACKUP */
# define HASH_ASSERT_OWNED(TABLE, FOLD)
#endif /* !UNIV_HOTBACKUP */

/*******************************************************************//**
Inserts a struct to a hash table. */

#define HASH_INSERT(TYPE, NAME, TABLE, FOLD, DATA)\
do {\
	hash_cell_t*	cell3333;\
	TYPE*		struct3333;\
\
	HASH_ASSERT_OWNED(TABLE, FOLD)\
\
	(DATA)->NAME = NULL;\
\
	cell3333 = hash_get_nth_cell(TABLE, hash_calc_hash(FOLD, TABLE));\
\
	if (cell3333->node == NULL) {\
		cell3333->node = DATA;\
	} else {\
		struct3333 = (TYPE*) cell3333->node;\
\
		while (struct3333->NAME != NULL) {\
\
			struct3333 = (TYPE*) struct3333->NAME;\
		}\
\
		struct3333->NAME = DATA;\
	}\
} while (0)

#ifdef UNIV_HASH_DEBUG
# define HASH_ASSERT_VALID(DATA) ut_a((void*) (DATA) != (void*) -1)
# define HASH_INVALIDATE(DATA, NAME) DATA->NAME = (void*) -1
#else
# define HASH_ASSERT_VALID(DATA) do {} while (0)
# define HASH_INVALIDATE(DATA, NAME) do {} while (0)
#endif

/*******************************************************************//**
Deletes a struct from a hash table. */

#define HASH_DELETE(TYPE, NAME, TABLE, FOLD, DATA)\
do {\
	hash_cell_t*	cell3333;\
	TYPE*		struct3333;\
\
	HASH_ASSERT_OWNED(TABLE, FOLD)\
\
	cell3333 = hash_get_nth_cell(TABLE, hash_calc_hash(FOLD, TABLE));\
\
	if (cell3333->node == DATA) {\
		HASH_ASSERT_VALID(DATA->NAME);\
		cell3333->node = DATA->NAME;\
	} else {\
		struct3333 = (TYPE*) cell3333->node;\
\
		while (struct3333->NAME != DATA) {\
\
			struct3333 = (TYPE*) struct3333->NAME;\
			ut_a(struct3333);\
		}\
\
		struct3333->NAME = DATA->NAME;\
	}\
	HASH_INVALIDATE(DATA, NAME);\
} while (0)

/*******************************************************************//**
Gets the first struct in a hash chain, NULL if none. */

#define HASH_GET_FIRST(TABLE, HASH_VAL)\
	(hash_get_nth_cell(TABLE, HASH_VAL)->node)

/*******************************************************************//**
Gets the next struct in a hash chain, NULL if none. */

#define HASH_GET_NEXT(NAME, DATA)	((DATA)->NAME)

/********************************************************************//**
Looks for a struct in a hash table. */
#define HASH_SEARCH(NAME, TABLE, FOLD, TYPE, DATA, ASSERTION, TEST)\
{\
\
	HASH_ASSERT_OWNED(TABLE, FOLD)\
\
	(DATA) = (TYPE) HASH_GET_FIRST(TABLE, hash_calc_hash(FOLD, TABLE));\
	HASH_ASSERT_VALID(DATA);\
\
	while ((DATA) != NULL) {\
		ASSERTION;\
		if (TEST) {\
			break;\
		} else {\
			HASH_ASSERT_VALID(HASH_GET_NEXT(NAME, DATA));\
			(DATA) = (TYPE) HASH_GET_NEXT(NAME, DATA);\
		}\
	}\
}

/********************************************************************//**
Looks for an item in all hash buckets. */
#define HASH_SEARCH_ALL(NAME, TABLE, TYPE, DATA, ASSERTION, TEST)	\
do {									\
	ulint	i3333;							\
									\
	for (i3333 = (TABLE)->n_cells; i3333--; ) {			\
		(DATA) = (TYPE) HASH_GET_FIRST(TABLE, i3333);		\
									\
		while ((DATA) != NULL) {				\
			HASH_ASSERT_VALID(DATA);			\
			ASSERTION;					\
									\
			if (TEST) {					\
				break;					\
			}						\
									\
			(DATA) = (TYPE) HASH_GET_NEXT(NAME, DATA);	\
		}							\
									\
		if ((DATA) != NULL) {					\
			break;						\
		}							\
	}								\
} while (0)

/************************************************************//**
Gets the nth cell in a hash table.
@return	pointer to cell */
UNIV_INLINE
hash_cell_t*
hash_get_nth_cell(
/*==============*/
	hash_table_t*	table,	/*!< in: hash table */
	ulint		n);	/*!< in: cell index */

/*************************************************************//**
Clears a hash table so that all the cells become empty. */
UNIV_INLINE
void
hash_table_clear(
/*=============*/
	hash_table_t*	table);	/*!< in/out: hash table */

/*************************************************************//**
Returns the number of cells in a hash table.
@return	number of cells */
UNIV_INLINE
ulint
hash_get_n_cells(
/*=============*/
	hash_table_t*	table);	/*!< in: table */
/*******************************************************************//**
Deletes a struct which is stored in the heap of the hash table, and compacts
the heap. The fold value must be stored in the struct NODE in a field named
'fold'. */

#define HASH_DELETE_AND_COMPACT(TYPE, NAME, TABLE, NODE)\
do {\
	TYPE*		node111;\
	TYPE*		top_node111;\
	hash_cell_t*	cell111;\
	ulint		fold111;\
\
	fold111 = (NODE)->fold;\
\
	HASH_DELETE(TYPE, NAME, TABLE, fold111, NODE);\
\
	top_node111 = (TYPE*)mem_heap_get_top(\
				hash_get_heap(TABLE, fold111),\
							sizeof(TYPE));\
\
	/* If the node to remove is not the top node in the heap, compact the\
	heap of nodes by moving the top node in the place of NODE. */\
\
	if (NODE != top_node111) {\
\
		/* Copy the top node in place of NODE */\
\
		*(NODE) = *top_node111;\
\
		cell111 = hash_get_nth_cell(TABLE,\
				hash_calc_hash(top_node111->fold, TABLE));\
\
		/* Look for the pointer to the top node, to update it */\
\
		if (cell111->node == top_node111) {\
			/* The top node is the first in the chain */\
\
			cell111->node = NODE;\
		} else {\
			/* We have to look for the predecessor of the top\
			node */\
			node111 = static_cast<TYPE *>(cell111->node);\
\
			while (top_node111 != HASH_GET_NEXT(NAME, node111)) {\
\
				node111 = static_cast<TYPE *>(HASH_GET_NEXT(NAME, node111));\
			}\
\
			/* Now we have the predecessor node */\
\
			node111->NAME = NODE;\
		}\
	}\
\
	/* Free the space occupied by the top node */\
\
	mem_heap_free_top(hash_get_heap(TABLE, fold111), sizeof(TYPE));\
} while (0)

#ifndef UNIV_HOTBACKUP
/****************************************************************//**
Move all hash table entries from OLD_TABLE to NEW_TABLE. */

#define HASH_MIGRATE(OLD_TABLE, NEW_TABLE, NODE_TYPE, PTR_NAME, FOLD_FUNC) \
do {\
	ulint		i2222;\
	ulint		cell_count2222;\
\
	cell_count2222 = hash_get_n_cells(OLD_TABLE);\
\
	for (i2222 = 0; i2222 < cell_count2222; i2222++) {\
		NODE_TYPE*	node2222 = static_cast<NODE_TYPE *>(HASH_GET_FIRST((OLD_TABLE), i2222));\
\
		while (node2222) {\
			NODE_TYPE*	next2222 = static_cast<NODE_TYPE *>(node2222->PTR_NAME);\
			ulint		fold2222 = FOLD_FUNC(node2222);\
\
			HASH_INSERT(NODE_TYPE, PTR_NAME, (NEW_TABLE),\
				fold2222, node2222);\
\
			node2222 = next2222;\
		}\
	}\
} while (0)

/************************************************************//**
Gets the mutex index for a fold value in a hash table.
@return	mutex number */
UNIV_INLINE
ulint
hash_get_mutex_no(
/*==============*/
	hash_table_t*	table,	/*!< in: hash table */
	ulint		fold);	/*!< in: fold */
/************************************************************//**
Gets the nth heap in a hash table.
@return	mem heap */
UNIV_INLINE
mem_heap_t*
hash_get_nth_heap(
/*==============*/
	hash_table_t*	table,	/*!< in: hash table */
	ulint		i);	/*!< in: index of the heap */
/************************************************************//**
Gets the heap for a fold value in a hash table.
@return	mem heap */
UNIV_INLINE
mem_heap_t*
hash_get_heap(
/*==========*/
	hash_table_t*	table,	/*!< in: hash table */
	ulint		fold);	/*!< in: fold */
/************************************************************//**
Gets the nth mutex in a hash table.
@return	mutex */
UNIV_INLINE
mutex_t*
hash_get_nth_mutex(
/*===============*/
	hash_table_t*	table,	/*!< in: hash table */
	ulint		i);	/*!< in: index of the mutex */
/************************************************************//**
Gets the mutex for a fold value in a hash table.
@return	mutex */
UNIV_INLINE
mutex_t*
hash_get_mutex(
/*===========*/
	hash_table_t*	table,	/*!< in: hash table */
	ulint		fold);	/*!< in: fold */
/************************************************************//**
Reserves the mutex for a fold value in a hash table. */
UNIV_INTERN
void
hash_mutex_enter(
/*=============*/
	hash_table_t*	table,	/*!< in: hash table */
	ulint		fold);	/*!< in: fold */
/************************************************************//**
Releases the mutex for a fold value in a hash table. */
UNIV_INTERN
void
hash_mutex_exit(
/*============*/
	hash_table_t*	table,	/*!< in: hash table */
	ulint		fold);	/*!< in: fold */
/************************************************************//**
Reserves all the mutexes of a hash table, in an ascending order. */
UNIV_INTERN
void
hash_mutex_enter_all(
/*=================*/
	hash_table_t*	table);	/*!< in: hash table */
/************************************************************//**
Releases all the mutexes of a hash table. */
UNIV_INTERN
void
hash_mutex_exit_all(
/*================*/
	hash_table_t*	table);	/*!< in: hash table */
#else /* !UNIV_HOTBACKUP */
# define hash_get_heap(table, fold)	((table)->heap)
# define hash_mutex_enter(table, fold)	((void) 0)
# define hash_mutex_exit(table, fold)	((void) 0)
#endif /* !UNIV_HOTBACKUP */

struct hash_cell_struct{
	void*	node;	/*!< hash chain node, NULL if none */
};

/* The hash table structure */
struct hash_table_struct {
#if defined UNIV_AHI_DEBUG || defined UNIV_DEBUG
# ifndef UNIV_HOTBACKUP
	ibool		adaptive;/* TRUE if this is the hash table of the
				adaptive hash index */
# endif /* !UNIV_HOTBACKUP */
#endif /* UNIV_AHI_DEBUG || UNIV_DEBUG */
	ulint		n_cells;/* number of cells in the hash table */
	hash_cell_t*	array;	/*!< pointer to cell array */
#ifndef UNIV_HOTBACKUP
	ulint		n_mutexes;/* if mutexes != NULL, then the number of
				mutexes, must be a power of 2 */
	mutex_t*	mutexes;/* NULL, or an array of mutexes used to
				protect segments of the hash table */
	mem_heap_t**	heaps;	/*!< if this is non-NULL, hash chain nodes for
				external chaining can be allocated from these
				memory heaps; there are then n_mutexes many of
				these heaps */
#endif /* !UNIV_HOTBACKUP */
	mem_heap_t*	heap;
#ifdef UNIV_DEBUG
	ulint		magic_n;
# define HASH_TABLE_MAGIC_N	76561114
#endif /* UNIV_DEBUG */
};

#ifndef UNIV_NONINL
#include "hash0hash.ic"
#endif

#endif