~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
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
/************************************************************************
The memory management: the debug code. This is not a compilation module,
but is included in mem0mem.* !

(c) 1994, 1995 Innobase Oy

Created 6/9/1994 Heikki Tuuri
*************************************************************************/

#ifdef UNIV_MEM_DEBUG
mutex_t	mem_hash_mutex;	 /* The mutex which protects in the
			debug version the hash table containing
			the list of live memory heaps, and
			also the global variables below. */

/* The following variables contain information about the
extent of memory allocations. Only used in the debug version.
Protected by mem_hash_mutex above. */

static ulint	mem_n_created_heaps		= 0;
static ulint	mem_n_allocations		= 0;
static ulint	mem_total_allocated_memory	= 0;
ulint		mem_current_allocated_memory	= 0;
static ulint	mem_max_allocated_memory	= 0;
static ulint	mem_last_print_info		= 0;

/* Size of the hash table for memory management tracking */
#define	MEM_HASH_SIZE	997

/* The node of the list containing currently allocated memory heaps */

typedef struct mem_hash_node_struct mem_hash_node_t;
struct mem_hash_node_struct {
	UT_LIST_NODE_T(mem_hash_node_t)
				list;	/* hash list node */
	mem_heap_t*		heap;	/* memory heap */
	const char*		file_name;/* file where heap was created*/
	ulint			line;	/* file line of creation */
	ulint			nth_heap;/* this is the nth heap created */
	UT_LIST_NODE_T(mem_hash_node_t)
				all_list;/* list of all created heaps */
};

typedef UT_LIST_BASE_NODE_T(mem_hash_node_t) mem_hash_cell_t;

/* The hash table of allocated heaps */
static mem_hash_cell_t		mem_hash_table[MEM_HASH_SIZE];

/* The base node of the list of all allocated heaps */
static mem_hash_cell_t		mem_all_list_base;

static ibool	mem_hash_initialized	= FALSE;


UNIV_INLINE
mem_hash_cell_t*
mem_hash_get_nth_cell(ulint i);

/* Accessor function for the hash table. Returns a pointer to the
table cell. */
UNIV_INLINE
mem_hash_cell_t*
mem_hash_get_nth_cell(ulint i)
{
	ut_a(i < MEM_HASH_SIZE);

	return(&(mem_hash_table[i]));
}

/* Accessor functions for a memory field in the debug version */

void
mem_field_header_set_len(byte* field, ulint len)
{
	mach_write_to_4(field - 2 * sizeof(ulint), len);
}

ulint
mem_field_header_get_len(byte* field)
{
	return(mach_read_from_4(field - 2 * sizeof(ulint)));
}

void
mem_field_header_set_check(byte* field, ulint check)
{
	mach_write_to_4(field - sizeof(ulint), check);
}

ulint
mem_field_header_get_check(byte* field)
{
	return(mach_read_from_4(field - sizeof(ulint)));
}

void
mem_field_trailer_set_check(byte* field, ulint check)
{
	mach_write_to_4(field + mem_field_header_get_len(field), check);
}

ulint
mem_field_trailer_get_check(byte* field)
{
	return(mach_read_from_4(field
				+ mem_field_header_get_len(field)));
}
#endif /* UNIV_MEM_DEBUG */

/**********************************************************************
Initializes the memory system. */

void
mem_init(
/*=====*/
	ulint	size)	/* in: common pool size in bytes */
{
#ifdef UNIV_MEM_DEBUG

	ulint	i;

	/* Initialize the hash table */
	ut_a(FALSE == mem_hash_initialized);

	mutex_create(&mem_hash_mutex, SYNC_MEM_HASH);

	for (i = 0; i < MEM_HASH_SIZE; i++) {
		UT_LIST_INIT(*mem_hash_get_nth_cell(i));
	}

	UT_LIST_INIT(mem_all_list_base);

	mem_hash_initialized = TRUE;
#endif

	mem_comm_pool = mem_pool_create(size);
}

#ifdef UNIV_MEM_DEBUG
/**********************************************************************
Initializes an allocated memory field in the debug version. */

void
mem_field_init(
/*===========*/
	byte*	buf,	/* in: memory field */
	ulint	n)	/* in: how many bytes the user requested */
{
	ulint	rnd;
	byte*	usr_buf;

	usr_buf = buf + MEM_FIELD_HEADER_SIZE;

	/* In the debug version write the length field and the
	check fields to the start and the end of the allocated storage.
	The field header consists of a length field and
	a random number field, in this order. The field trailer contains
	the same random number as a check field. */

	mem_field_header_set_len(usr_buf, n);

	rnd = ut_rnd_gen_ulint();

	mem_field_header_set_check(usr_buf, rnd);
	mem_field_trailer_set_check(usr_buf, rnd);

	/* Update the memory allocation information */

	mutex_enter(&mem_hash_mutex);

	mem_total_allocated_memory += n;
	mem_current_allocated_memory += n;
	mem_n_allocations++;

	if (mem_current_allocated_memory > mem_max_allocated_memory) {
		mem_max_allocated_memory = mem_current_allocated_memory;
	}

	mutex_exit(&mem_hash_mutex);

	/* In the debug version set the buffer to a random
	combination of 0xBA and 0xBE */

	mem_init_buf(usr_buf, n);
}

/**********************************************************************
Erases an allocated memory field in the debug version. */

void
mem_field_erase(
/*============*/
	byte*	buf,	/* in: memory field */
	ulint	n __attribute__((unused)))
			/* in: how many bytes the user requested */
{
	byte*	usr_buf;

	usr_buf = buf + MEM_FIELD_HEADER_SIZE;

	mutex_enter(&mem_hash_mutex);
	mem_current_allocated_memory	-= n;
	mutex_exit(&mem_hash_mutex);

	/* Check that the field lengths agree */
	ut_ad(n == (ulint)mem_field_header_get_len(usr_buf));

	/* In the debug version, set the freed space to a random
	combination of 0xDE and 0xAD */

	mem_erase_buf(buf, MEM_SPACE_NEEDED(n));
}

/*******************************************************************
Initializes a buffer to a random combination of hex BA and BE.
Used to initialize allocated memory. */

void
mem_init_buf(
/*=========*/
	byte*	buf,	/* in: pointer to buffer */
	ulint	 n)	/* in: length of buffer */
{
	byte*	ptr;

	UNIV_MEM_ASSERT_W(buf, n);

	for (ptr = buf; ptr < buf + n; ptr++) {

		if (ut_rnd_gen_ibool()) {
			*ptr = 0xBA;
		} else {
			*ptr = 0xBE;
		}
	}

	UNIV_MEM_INVALID(buf, n);
}

/*******************************************************************
Initializes a buffer to a random combination of hex DE and AD.
Used to erase freed memory.*/

void
mem_erase_buf(
/*==========*/
	byte*	buf,	/* in: pointer to buffer */
	ulint	 n)	 /* in: length of buffer */
{
	byte*	ptr;

	UNIV_MEM_ASSERT_W(buf, n);

	for (ptr = buf; ptr < buf + n; ptr++) {
		if (ut_rnd_gen_ibool()) {
			*ptr = 0xDE;
		} else {
			*ptr = 0xAD;
		}
	}

	UNIV_MEM_FREE(buf, n);
}

/*******************************************************************
Inserts a created memory heap to the hash table of current allocated
memory heaps. */

void
mem_hash_insert(
/*============*/
	mem_heap_t*	heap,	   /* in: the created heap */
	const char*	file_name, /* in: file name of creation */
	ulint		line)	   /* in: line where created */
{
	mem_hash_node_t*	new_node;
	ulint			cell_no	;

	ut_ad(mem_heap_check(heap));

	mutex_enter(&mem_hash_mutex);

	cell_no = ut_hash_ulint((ulint)heap, MEM_HASH_SIZE);

	/* Allocate a new node to the list */
	new_node = ut_malloc(sizeof(mem_hash_node_t));

	new_node->heap = heap;
	new_node->file_name = file_name;
	new_node->line = line;
	new_node->nth_heap = mem_n_created_heaps;

	/* Insert into lists */
	UT_LIST_ADD_FIRST(list, *mem_hash_get_nth_cell(cell_no), new_node);

	UT_LIST_ADD_LAST(all_list, mem_all_list_base, new_node);

	mem_n_created_heaps++;

	mutex_exit(&mem_hash_mutex);
}

/*******************************************************************
Removes a memory heap (which is going to be freed by the caller)
from the list of live memory heaps. Returns the size of the heap
in terms of how much memory in bytes was allocated for the user of
the heap (not the total space occupied by the heap).
Also validates the heap.
NOTE: This function does not free the storage occupied by the
heap itself, only the node in the list of heaps. */

void
mem_hash_remove(
/*============*/
	mem_heap_t*	heap,	   /* in: the heap to be freed */
	const char*	file_name, /* in: file name of freeing */
	ulint		line)	   /* in: line where freed */
{
	mem_hash_node_t*	node;
	ulint			cell_no;
	ibool			error;
	ulint			size;

	ut_ad(mem_heap_check(heap));

	mutex_enter(&mem_hash_mutex);

	cell_no = ut_hash_ulint((ulint)heap, MEM_HASH_SIZE);

	/* Look for the heap in the hash table list */
	node = UT_LIST_GET_FIRST(*mem_hash_get_nth_cell(cell_no));

	while (node != NULL) {
		if (node->heap == heap) {

			break;
		}

		node = UT_LIST_GET_NEXT(list, node);
	}

	if (node == NULL) {
		fprintf(stderr,
			"Memory heap or buffer freed in %s line %lu"
			" did not exist.\n",
			file_name, (ulong) line);
		ut_error;
	}

	/* Remove from lists */
	UT_LIST_REMOVE(list, *mem_hash_get_nth_cell(cell_no), node);

	UT_LIST_REMOVE(all_list, mem_all_list_base, node);

	/* Validate the heap which will be freed */
	mem_heap_validate_or_print(node->heap, NULL, FALSE, &error, &size,
				   NULL, NULL);
	if (error) {
		fprintf(stderr,
			"Inconsistency in memory heap or"
			" buffer n:o %lu created\n"
			"in %s line %lu and tried to free in %s line %lu.\n"
			"Hex dump of 400 bytes around memory heap"
			" first block start:\n",
			node->nth_heap, node->file_name, (ulong) node->line,
			file_name, (ulong) line);
		ut_print_buf(stderr, (byte*)node->heap - 200, 400);
		fputs("\nDump of the mem heap:\n", stderr);
		mem_heap_validate_or_print(node->heap, NULL, TRUE, &error,
					   &size, NULL, NULL);
		ut_error;
	}

	/* Free the memory occupied by the node struct */
	ut_free(node);

	mem_current_allocated_memory -= size;

	mutex_exit(&mem_hash_mutex);
}
#endif /* UNIV_MEM_DEBUG */

#if defined UNIV_MEM_DEBUG || defined UNIV_DEBUG
/*******************************************************************
Checks a memory heap for consistency and prints the contents if requested.
Outputs the sum of sizes of buffers given to the user (only in
the debug version), the physical size of the heap and the number of
blocks in the heap. In case of error returns 0 as sizes and number
of blocks. */

void
mem_heap_validate_or_print(
/*=======================*/
	mem_heap_t*	heap,	/* in: memory heap */
	byte*		top __attribute__((unused)),
				/* in: calculate and validate only until
				this top pointer in the heap is reached,
				if this pointer is NULL, ignored */
	ibool		print,	/* in: if TRUE, prints the contents
				of the heap; works only in
				the debug version */
	ibool*		error,	/* out: TRUE if error */
	ulint*		us_size,/* out: allocated memory
				(for the user) in the heap,
				if a NULL pointer is passed as this
				argument, it is ignored; in the
				non-debug version this is always -1 */
	ulint*		ph_size,/* out: physical size of the heap,
				if a NULL pointer is passed as this
				argument, it is ignored */
	ulint*		n_blocks) /* out: number of blocks in the heap,
				if a NULL pointer is passed as this
				argument, it is ignored */
{
	mem_block_t*	block;
	ulint		total_len	= 0;
	ulint		block_count	= 0;
	ulint		phys_len	= 0;
#ifdef UNIV_MEM_DEBUG
	ulint		len;
	byte*		field;
	byte*		user_field;
	ulint		check_field;
#endif

	/* Pessimistically, we set the parameters to error values */
	if (us_size != NULL) {
		*us_size = 0;
	}
	if (ph_size != NULL) {
		*ph_size = 0;
	}
	if (n_blocks != NULL) {
		*n_blocks = 0;
	}
	*error = TRUE;

	block = heap;

	if (block->magic_n != MEM_BLOCK_MAGIC_N) {
		return;
	}

	if (print) {
		fputs("Memory heap:", stderr);
	}

	while (block != NULL) {
		phys_len += mem_block_get_len(block);

		if ((block->type == MEM_HEAP_BUFFER)
		    && (mem_block_get_len(block) > UNIV_PAGE_SIZE)) {

			fprintf(stderr,
				"InnoDB: Error: mem block %p"
				" length %lu > UNIV_PAGE_SIZE\n",
				(void*) block,
				(ulong) mem_block_get_len(block));
			/* error */

			return;
		}

#ifdef UNIV_MEM_DEBUG
		/* We can trace the fields of the block only in the debug
		version */
		if (print) {
			fprintf(stderr, " Block %ld:", block_count);
		}

		field = (byte*)block + mem_block_get_start(block);

		if (top && (field == top)) {

			goto completed;
		}

		while (field < (byte*)block + mem_block_get_free(block)) {

			/* Calculate the pointer to the storage
			which was given to the user */

			user_field = field + MEM_FIELD_HEADER_SIZE;

			len = mem_field_header_get_len(user_field);

			if (print) {
				ut_print_buf(stderr, user_field, len);
			}

			total_len += len;
			check_field = mem_field_header_get_check(user_field);

			if (check_field
			    != mem_field_trailer_get_check(user_field)) {
				/* error */

				fprintf(stderr,
					"InnoDB: Error: block %lx mem"
					" field %lx len %lu\n"
					"InnoDB: header check field is"
					" %lx but trailer %lx\n",
					(ulint)block,
					(ulint)field, len, check_field,
					mem_field_trailer_get_check(
						user_field));

				return;
			}

			/* Move to next field */
			field = field + MEM_SPACE_NEEDED(len);

			if (top && (field == top)) {

				goto completed;
			}

		}

		/* At the end check that we have arrived to the first free
		position */

		if (field != (byte*)block + mem_block_get_free(block)) {
			/* error */

			fprintf(stderr,
				"InnoDB: Error: block %lx end of"
				" mem fields %lx\n"
				"InnoDB: but block free at %lx\n",
				(ulint)block, (ulint)field,
				(ulint)((byte*)block
					+ mem_block_get_free(block)));

			return;
		}

#endif

		block = UT_LIST_GET_NEXT(list, block);
		block_count++;
	}
#ifdef UNIV_MEM_DEBUG
completed:
#endif
	if (us_size != NULL) {
		*us_size = total_len;
	}
	if (ph_size != NULL) {
		*ph_size = phys_len;
	}
	if (n_blocks != NULL) {
		*n_blocks = block_count;
	}
	*error = FALSE;
}

/******************************************************************
Prints the contents of a memory heap. */
static
void
mem_heap_print(
/*===========*/
	mem_heap_t*	heap)	/* in: memory heap */
{
	ibool	error;
	ulint	us_size;
	ulint	phys_size;
	ulint	n_blocks;

	ut_ad(mem_heap_check(heap));

	mem_heap_validate_or_print(heap, NULL, TRUE, &error,
				   &us_size, &phys_size, &n_blocks);
	fprintf(stderr,
		"\nheap type: %lu; size: user size %lu;"
		" physical size %lu; blocks %lu.\n",
		(ulong) heap->type, (ulong) us_size,
		(ulong) phys_size, (ulong) n_blocks);
	ut_a(!error);
}

/******************************************************************
Validates the contents of a memory heap. */

ibool
mem_heap_validate(
/*==============*/
				/* out: TRUE if ok */
	mem_heap_t*	heap)	/* in: memory heap */
{
	ibool	error;
	ulint	us_size;
	ulint	phys_size;
	ulint	n_blocks;

	ut_ad(mem_heap_check(heap));

	mem_heap_validate_or_print(heap, NULL, FALSE, &error, &us_size,
				   &phys_size, &n_blocks);
	if (error) {
		mem_heap_print(heap);
	}

	ut_a(!error);

	return(TRUE);
}
#endif /* UNIV_MEM_DEBUG || UNIV_DEBUG */

#ifdef UNIV_DEBUG
/******************************************************************
Checks that an object is a memory heap (or a block of it). */

ibool
mem_heap_check(
/*===========*/
				/* out: TRUE if ok */
	mem_heap_t*	heap)	/* in: memory heap */
{
	ut_a(heap->magic_n == MEM_BLOCK_MAGIC_N);

	return(TRUE);
}
#endif /* UNIV_DEBUG */

#ifdef UNIV_MEM_DEBUG
/*********************************************************************
TRUE if no memory is currently allocated. */

ibool
mem_all_freed(void)
/*===============*/
			/* out: TRUE if no heaps exist */
{
	mem_hash_node_t*	node;
	ulint			heap_count	= 0;
	ulint			i;

	mem_validate();

	mutex_enter(&mem_hash_mutex);

	for (i = 0; i < MEM_HASH_SIZE; i++) {

		node = UT_LIST_GET_FIRST(*mem_hash_get_nth_cell(i));
		while (node != NULL) {
			heap_count++;
			node = UT_LIST_GET_NEXT(list, node);
		}
	}

	mutex_exit(&mem_hash_mutex);

	if (heap_count == 0) {

		ut_a(mem_pool_get_reserved(mem_comm_pool) == 0);

		return(TRUE);
	} else {
		return(FALSE);
	}
}

/*********************************************************************
Validates the dynamic memory allocation system. */

ibool
mem_validate_no_assert(void)
/*========================*/
			/* out: TRUE if error */
{
	mem_hash_node_t*	node;
	ulint			n_heaps			= 0;
	ulint			allocated_mem;
	ulint			ph_size;
	ulint			total_allocated_mem	= 0;
	ibool			error			= FALSE;
	ulint			n_blocks;
	ulint			i;

	mem_pool_validate(mem_comm_pool);

	mutex_enter(&mem_hash_mutex);

	for (i = 0; i < MEM_HASH_SIZE; i++) {

		node = UT_LIST_GET_FIRST(*mem_hash_get_nth_cell(i));

		while (node != NULL) {
			n_heaps++;

			mem_heap_validate_or_print(node->heap, NULL,
						   FALSE, &error,
						   &allocated_mem,
						   &ph_size, &n_blocks);

			if (error) {
				fprintf(stderr,
					"\nERROR!!!!!!!!!!!!!!!!!!!"
					"!!!!!!!!!!!!!!!!!!!!!!!\n\n"
					"Inconsistency in memory heap"
					" or buffer created\n"
					"in %s line %lu.\n",
					node->file_name, node->line);

				mutex_exit(&mem_hash_mutex);

				return(TRUE);
			}

			total_allocated_mem += allocated_mem;
			node = UT_LIST_GET_NEXT(list, node);
		}
	}

	if ((n_heaps == 0) && (mem_current_allocated_memory != 0)) {
		error = TRUE;
	}

	if (mem_total_allocated_memory < mem_current_allocated_memory) {
		error = TRUE;
	}

	if (mem_max_allocated_memory > mem_total_allocated_memory) {
		error = TRUE;
	}

	if (mem_n_created_heaps < n_heaps) {
		error = TRUE;
	}

	mutex_exit(&mem_hash_mutex);

	return(error);
}

/****************************************************************
Validates the dynamic memory */

ibool
mem_validate(void)
/*==============*/
			/* out: TRUE if ok */
{
	ut_a(!mem_validate_no_assert());

	return(TRUE);
}
#endif /* UNIV_MEM_DEBUG */

/****************************************************************
Tries to find neigboring memory allocation blocks and dumps to stderr
the neighborhood of a given pointer. */

void
mem_analyze_corruption(
/*===================*/
	void*	ptr)	/* in: pointer to place of possible corruption */
{
	byte*	p;
	ulint	i;
	ulint	dist;

	fputs("InnoDB: Apparent memory corruption: mem dump ", stderr);
	ut_print_buf(stderr, (byte*)ptr - 250, 500);

	fputs("\nInnoDB: Scanning backward trying to find"
	      " previous allocated mem blocks\n", stderr);

	p = (byte*)ptr;
	dist = 0;

	for (i = 0; i < 10; i++) {
		for (;;) {
			if (((ulint)p) % 4 == 0) {

				if (*((ulint*)p) == MEM_BLOCK_MAGIC_N) {
					fprintf(stderr,
						"Mem block at - %lu,"
						" file %s, line %lu\n",
						(ulong) dist,
						(p + sizeof(ulint)),
						(ulong)
						(*(ulint*)(p + 8
							   + sizeof(ulint))));

					break;
				}

				if (*((ulint*)p) == MEM_FREED_BLOCK_MAGIC_N) {
					fprintf(stderr,
						"Freed mem block at - %lu,"
						" file %s, line %lu\n",
						(ulong) dist,
						(p + sizeof(ulint)),
						(ulong)
						(*(ulint*)(p + 8
							   + sizeof(ulint))));

					break;
				}
			}

			p--;
			dist++;
		}

		p--;
		dist++;
	}

	fprintf(stderr,
		"InnoDB: Scanning forward trying to find next"
		" allocated mem blocks\n");

	p = (byte*)ptr;
	dist = 0;

	for (i = 0; i < 10; i++) {
		for (;;) {
			if (((ulint)p) % 4 == 0) {

				if (*((ulint*)p) == MEM_BLOCK_MAGIC_N) {
					fprintf(stderr,
						"Mem block at + %lu, file %s,"
						" line %lu\n",
						(ulong) dist,
						(p + sizeof(ulint)),
						(ulong)
						(*(ulint*)(p + 8
							   + sizeof(ulint))));

					break;
				}

				if (*((ulint*)p) == MEM_FREED_BLOCK_MAGIC_N) {
					fprintf(stderr,
						"Freed mem block at + %lu,"
						" file %s, line %lu\n",
						(ulong) dist,
						(p + sizeof(ulint)),
						(ulong)
						(*(ulint*)(p + 8
							   + sizeof(ulint))));

					break;
				}
			}

			p++;
			dist++;
		}

		p++;
		dist++;
	}
}

/*********************************************************************
Prints information of dynamic memory usage and currently allocated
memory heaps or buffers. Can only be used in the debug version. */
static
void
mem_print_info_low(
/*===============*/
	ibool	print_all)	/* in: if TRUE, all heaps are printed,
				else only the heaps allocated after the
				previous call of this function */
{
#ifdef UNIV_MEM_DEBUG
	mem_hash_node_t*	node;
	ulint			n_heaps			= 0;
	ulint			allocated_mem;
	ulint			ph_size;
	ulint			total_allocated_mem	= 0;
	ibool			error;
	ulint			n_blocks;
#endif
	FILE*			outfile;

	/* outfile = fopen("ibdebug", "a"); */

	outfile = stdout;

	fprintf(outfile, "\n");
	fprintf(outfile,
		"________________________________________________________\n");
	fprintf(outfile, "MEMORY ALLOCATION INFORMATION\n\n");

#ifndef UNIV_MEM_DEBUG

	UT_NOT_USED(print_all);

	mem_pool_print_info(outfile, mem_comm_pool);

	fprintf(outfile,
		"Sorry, non-debug version cannot give more memory info\n");

	/* fclose(outfile); */

	return;
#else
	mutex_enter(&mem_hash_mutex);

	fprintf(outfile, "LIST OF CREATED HEAPS AND ALLOCATED BUFFERS: \n\n");

	if (!print_all) {
		fprintf(outfile, "AFTER THE LAST PRINT INFO\n");
	}

	node = UT_LIST_GET_FIRST(mem_all_list_base);

	while (node != NULL) {
		n_heaps++;

		if (!print_all && node->nth_heap < mem_last_print_info) {

			goto next_heap;
		}

		mem_heap_validate_or_print(node->heap, NULL,
					   FALSE, &error, &allocated_mem,
					   &ph_size, &n_blocks);
		total_allocated_mem += allocated_mem;

		fprintf(outfile,
			"%lu: file %s line %lu of size %lu phys.size %lu"
			" with %lu blocks, type %lu\n",
			node->nth_heap, node->file_name, node->line,
			allocated_mem, ph_size, n_blocks,
			(node->heap)->type);
next_heap:
		node = UT_LIST_GET_NEXT(all_list, node);
	}

	fprintf(outfile, "\n");

	fprintf(outfile, "Current allocated memory              : %lu\n",
		mem_current_allocated_memory);
	fprintf(outfile, "Current allocated heaps and buffers   : %lu\n",
		n_heaps);
	fprintf(outfile, "Cumulative allocated memory           : %lu\n",
		mem_total_allocated_memory);
	fprintf(outfile, "Maximum allocated memory              : %lu\n",
		mem_max_allocated_memory);
	fprintf(outfile, "Cumulative created heaps and buffers  : %lu\n",
		mem_n_created_heaps);
	fprintf(outfile, "Cumulative number of allocations      : %lu\n",
		mem_n_allocations);

	mem_last_print_info = mem_n_created_heaps;

	mutex_exit(&mem_hash_mutex);

	mem_pool_print_info(outfile, mem_comm_pool);

	/*	mem_validate(); */

	/*	fclose(outfile); */
#endif
}

/*********************************************************************
Prints information of dynamic memory usage and currently allocated memory
heaps or buffers. Can only be used in the debug version. */

void
mem_print_info(void)
/*================*/
{
	mem_print_info_low(TRUE);
}

/*********************************************************************
Prints information of dynamic memory usage and currently allocated memory
heaps or buffers since the last ..._print_info or..._print_new_info. */

void
mem_print_new_info(void)
/*====================*/
{
	mem_print_info_low(FALSE);
}