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
|
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* Copyright by the Board of Trustees of the University of Illinois. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://www.hdfgroup.org/licenses. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*
* This file contains public declarations for the HDF5 module.
*/
#ifndef H5public_H
#define H5public_H
/* Include files for public use... */
/*
* Since H5pubconf.h is a generated header file, it is messy to try
* to put a #ifndef H5pubconf_H ... #endif guard in it.
* HDF5 has set an internal rule that it is being included here.
* Source files should NOT include H5pubconf.h directly but include
* it via H5public.h. The #ifndef H5public_H guard above would
* prevent repeated include.
*/
#include "H5pubconf.h" /* From configure */
/* API Version macro wrapper definitions */
#include "H5version.h"
#ifdef H5_HAVE_FEATURES_H
#include <features.h> /* For setting POSIX, BSD, etc. compatibility */
#endif
/* C library header files for things that appear in HDF5 public headers */
#ifdef __cplusplus
#define __STDC_FORMAT_MACROS
#endif
#include <inttypes.h>
#include <limits.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
/* Unlike most sys/ headers, which are POSIX-only, sys/types.h is available
* on Windows, though it doesn't necessarily contain all the POSIX types
* we need for HDF5 (e.g. ssize_t).
*/
#ifdef H5_HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef H5_HAVE_PARALLEL
/* Don't link against MPI C++ bindings */
#ifndef MPICH_SKIP_MPICXX
#define MPICH_SKIP_MPICXX 1
#endif
#ifndef OMPI_SKIP_MPICXX
#define OMPI_SKIP_MPICXX 1
#endif
#include <mpi.h>
#ifndef MPI_FILE_NULL /* MPIO may be defined in mpi.h already */
#include <mpio.h>
#endif
#endif
/* Macro to hide a symbol from further preprocessor substitutions */
#define H5_NO_EXPAND(x) (x)
/* Version numbers */
/**
* For major interface/format changes
*/
#define H5_VERS_MAJOR 1
/**
* For minor interface/format changes
*/
#define H5_VERS_MINOR 13
/**
* For tweaks, bug-fixes, or development
*/
#define H5_VERS_RELEASE 1
/**
* For pre-releases like \c snap0. Empty string for official releases.
*/
#define H5_VERS_SUBRELEASE "1"
/**
* Full version string
*/
#define H5_VERS_INFO "HDF5 library version: 1.13.1-1"
#define H5check() H5check_version(H5_VERS_MAJOR, H5_VERS_MINOR, H5_VERS_RELEASE)
/* macros for comparing the version */
/**
* \brief Determines whether the version of the library being used is greater
* than or equal to the specified version
*
* \param[in] Maj Major version number - A non-negative integer value
* \param[in] Min Minor version number - A non-negative integer value
* \param[in] Rel Release version number - A non-negative integer value
* \returns A value of 1 is returned if the library version is greater than
* or equal to the version number specified.\n
* A value of 0 is returned if the library version is less than the
* version number specified.\n
* A library version is greater than the specified version number if
* its major version is larger than the specified major version
* number. If the major version numbers are the same, it is greater
* than the specified version number if its minor version is larger
* than the specified minor version number. If the minor version
* numbers are the same, then a library version would be greater than
* the specified version number if its release number is larger than
* the specified release number.
*
* \details The #H5_VERSION_GE and #H5_VERSION_LE macros are used at compile
* time to conditionally include or exclude code based on the version
* of the HDF5 library against which an application will be linked.
*
* The #H5_VERSION_GE macro compares the version of the HDF5 library
* being used against the version number specified in the parameters.
*
* For more information about release versioning, see \ref_h5lib_relver.
*
* \since 1.8.7
*
*/
#define H5_VERSION_GE(Maj, Min, Rel) \
(((H5_VERS_MAJOR == Maj) && (H5_VERS_MINOR == Min) && (H5_VERS_RELEASE >= Rel)) || \
((H5_VERS_MAJOR == Maj) && (H5_VERS_MINOR > Min)) || (H5_VERS_MAJOR > Maj))
/**
* \brief Determines whether the version of the library being used is less
* than or equal to the specified version
*
* \param[in] Maj Major version number - A non-negative integer value
* \param[in] Min Minor version number - A non-negative integer value
* \param[in] Rel Release version number - A non-negative integer value
* \returns A value of 1 is returned if the library version is less than
* or equal to the version number specified.\n
* A value of 0 is returned if the library version is greater than the
* version number specified.\n
* A library version is less than the specified version number if
* its major version is smaller than the specified major version
* number. If the major version numbers are the same, it is smaller
* than the specified version number if its minor version is smaller
* than the specified minor version number. If the minor version
* numbers are the same, then a library version would be smaller than
* the specified version number if its release number is smaller than
* the specified release number.
*
* \details The #H5_VERSION_GE and #H5_VERSION_LE macros are used at compile
* time to conditionally include or exclude code based on the version
* of the HDF5 library against which an application will be linked.
*
* The #H5_VERSION_LE macro compares the version of the HDF5 library
* being used against the version number specified in the parameters.
*
* For more information about release versioning, see \ref_h5lib_relver.
*
* \since 1.8.7
*
*/
#define H5_VERSION_LE(Maj, Min, Rel) \
(((H5_VERS_MAJOR == Maj) && (H5_VERS_MINOR == Min) && (H5_VERS_RELEASE <= Rel)) || \
((H5_VERS_MAJOR == Maj) && (H5_VERS_MINOR < Min)) || (H5_VERS_MAJOR < Maj))
/* Macros for various environment variables that HDF5 interprets */
/**
* Used to specify the name of an HDF5 Virtual File Driver to use as
* the default file driver for file access. Setting this environment
* variable overrides the default file driver for File Access Property
* Lists.
*/
#define HDF5_DRIVER "HDF5_DRIVER"
/**
* Used to specify a configuration string for the HDF5 Virtual File
* Driver being used for file access.
*/
#define HDF5_DRIVER_CONFIG "HDF5_DRIVER_CONFIG"
/**
* Used to specify the name of an HDF5 Virtual Object Layer Connector
* to use as the default VOL connector for file access. Setting this
* environment variable overrides the default VOL connector for File
* Access Property Lists.
*/
#define HDF5_VOL_CONNECTOR "HDF5_VOL_CONNECTOR"
/**
* Used to specify a delimiter-separated (currently, ';' for Windows
* and ':' for other systems) list of paths that HDF5 should search
* when loading plugins.
*/
#define HDF5_PLUGIN_PATH "HDF5_PLUGIN_PATH"
/**
* Used to control the loading of HDF5 plugins at runtime. If this
* environment variable is set to the special string "::" (defined
* in H5PLpublic.h as H5PL_NO_PLUGIN), then dynamic loading of any
* HDF5 plugins will be disabled. No other values are valid for this
* environment variable.
*/
#define HDF5_PLUGIN_PRELOAD "HDF5_PLUGIN_PRELOAD"
/**
* Used to control whether HDF5 uses file locking when creating or
* opening a file. Valid values for this environment variable are
* as follows:
*
* "TRUE" or "1" - Request that file locks should be used
* "FALSE" or "0" - Request that file locks should NOT be used
* "BEST_EFFORT" - Request that file locks should be used and
* that any locking errors caused by file
* locking being disabled on the system
* should be ignored
*/
#define HDF5_USE_FILE_LOCKING "HDF5_USE_FILE_LOCKING"
/**
* Used to instruct HDF5 not to cleanup files created during testing.
*/
#define HDF5_NOCLEANUP "HDF5_NOCLEANUP"
/**
* Status return values. Failed integer functions in HDF5 result almost
* always in a negative value (unsigned failing functions sometimes return
* zero for failure) while successful return is non-negative (often zero).
* The negative failure value is most commonly -1, but don't bet on it.
*
* The proper way to detect failure is something like:
* \code
* if((dset = H5Dopen2(file, name)) < 0)
* fprintf(stderr, "unable to open the requested dataset\n");
* \endcode
*/
typedef int herr_t;
/**
* C99-style Boolean type. Successful return values are zero (false) or positive
* (true). The typical true value is 1 but don't bet on it.
* \attention Boolean functions cannot fail.
*/
#include <stdbool.h>
typedef bool hbool_t;
/**
* Three-valued Boolean type. Functions that return #htri_t however return zero
* (false), positive (true), or negative (failure).
*
* The proper way to test for truth from a #htri_t function is:
* \code
* if ((retval = H5Tcommitted(type)) > 0) {
* printf("data type is committed\n");
* } else if (!retval) {
* printf("data type is not committed\n");
* } else {
* printf("error determining whether data type is committed\n");
* }
* \endcode
*/
typedef int htri_t;
/* The signed version of size_t
*
* ssize_t is POSIX and not defined in any C standard. It's used in some
* public HDF5 API calls so this work-around will define it if it's not
* present.
*
* Use of ssize_t should be discouraged in new code.
*/
#if H5_SIZEOF_SSIZE_T == 0
/* Undefine this size, we will re-define it in one of the sections below */
#undef H5_SIZEOF_SSIZE_T
#if H5_SIZEOF_SIZE_T == H5_SIZEOF_INT
typedef int ssize_t;
#define H5_SIZEOF_SSIZE_T H5_SIZEOF_INT
#elif H5_SIZEOF_SIZE_T == H5_SIZEOF_LONG
typedef long ssize_t;
#define H5_SIZEOF_SSIZE_T H5_SIZEOF_LONG
#elif H5_SIZEOF_SIZE_T == H5_SIZEOF_LONG_LONG
typedef long long ssize_t;
#define H5_SIZEOF_SSIZE_T H5_SIZEOF_LONG_LONG
#else /* Can't find matching type for ssize_t */
#error "nothing appropriate for ssize_t"
#endif
#endif
/**
* The size of file objects.
*
* \internal Defined as a (minimum) 64-bit integer type.
*/
typedef uint64_t hsize_t;
/**
* The size of file objects. Used when negative values are needed to indicate errors.
*
* \internal Defined as a (minimum) 64-bit integer type. Use of hssize_t
* should be discouraged in new code.
*/
typedef int64_t hssize_t;
#define PRIdHSIZE PRId64
#define PRIiHSIZE PRIi64
#define PRIoHSIZE PRIo64
#define PRIuHSIZE PRIu64
#define PRIxHSIZE PRIx64
#define PRIXHSIZE PRIX64
#define H5_SIZEOF_HSIZE_T 8
#define H5_SIZEOF_HSSIZE_T 8
#define H5_PRINTF_HSIZE_FMT "%" PRIuHSIZE
#define HSIZE_UNDEF UINT64_MAX
/**
* The address of an object in the file.
*
* \internal Defined as a (minimum) 64-bit unsigned integer type.
*/
typedef uint64_t haddr_t;
#define PRIdHADDR PRId64
#define PRIoHADDR PRIo64
#define PRIuHADDR PRIu64
#define PRIxHADDR PRIx64
#define PRIXHADDR PRIX64
#define H5_SIZEOF_HADDR_T 8
#define HADDR_UNDEF UINT64_MAX
#define H5_PRINTF_HADDR_FMT "%" PRIuHADDR
#define HADDR_MAX (HADDR_UNDEF - 1)
#ifdef H5_HAVE_PARALLEL
#define HADDR_AS_MPI_TYPE MPI_LONG_LONG_INT
#endif
//! <!-- [H5_iter_order_t_snip] -->
/**
* Common iteration orders
*/
typedef enum {
H5_ITER_UNKNOWN = -1, /**< Unknown order */
H5_ITER_INC, /**< Increasing order */
H5_ITER_DEC, /**< Decreasing order */
H5_ITER_NATIVE, /**< No particular order, whatever is fastest */
H5_ITER_N /**< Number of iteration orders */
} H5_iter_order_t;
//! <!-- [H5_iter_order_t_snip] -->
/* Iteration callback values */
/* (Actually, any positive value will cause the iterator to stop and pass back
* that positive value to the function that called the iterator)
*/
#define H5_ITER_ERROR (-1) /**< Error, stop iteration */
#define H5_ITER_CONT (0) /**< Continue iteration */
#define H5_ITER_STOP (1) /**< Stop iteration, short-circuit success */
//! <!-- [H5_index_t_snip] -->
/**
* The types of indices on links in groups/attributes on objects.
* Primarily used for "<do> <foo> by index" routines and for iterating over
* links in groups/attributes on objects.
*/
typedef enum H5_index_t {
H5_INDEX_UNKNOWN = -1, /**< Unknown index type */
H5_INDEX_NAME, /**< Index on names */
H5_INDEX_CRT_ORDER, /**< Index on creation order */
H5_INDEX_N /**< Number of indices defined */
} H5_index_t;
//! <!-- [H5_index_t_snip] -->
/**
* Storage info struct used by H5O_info_t and H5F_info_t
*/
//! <!-- [H5_ih_info_t_snip] -->
typedef struct H5_ih_info_t {
hsize_t index_size; /**< btree and/or list */
hsize_t heap_size;
} H5_ih_info_t;
//! <!-- [H5_ih_info_t_snip] -->
/**
* The maximum size allowed for tokens
* \details Tokens are unique and permanent identifiers that are
* used to reference HDF5 objects in a container. This allows
* for 128-bit tokens
*/
#define H5O_MAX_TOKEN_SIZE (16)
//! <!-- [H5O_token_t_snip] -->
/**
* Type for object tokens
*
* \internal (Hoisted here, since it's used by both the
* H5Lpublic.h and H5Opublic.h headers)
*/
typedef struct H5O_token_t {
uint8_t __data[H5O_MAX_TOKEN_SIZE];
} H5O_token_t;
//! <!-- [H5O_token_t_snip] -->
/**
* Allocation statistics info struct
*/
typedef struct H5_alloc_stats_t {
unsigned long long total_alloc_bytes; /**< Running count of total # of bytes allocated */
size_t curr_alloc_bytes; /**< Current # of bytes allocated */
size_t peak_alloc_bytes; /**< Peak # of bytes allocated */
size_t max_block_size; /**< Largest block allocated */
size_t total_alloc_blocks_count; /**< Running count of total # of blocks allocated */
size_t curr_alloc_blocks_count; /**< Current # of blocks allocated */
size_t peak_alloc_blocks_count; /**< Peak # of blocks allocated */
} H5_alloc_stats_t;
/**
* Library shutdown callback, used by H5atclose().
*/
typedef void (*H5_atclose_func_t)(void *ctx);
/* API adapter header (defines H5_DLL, etc.) */
#include "H5api_adpt.h"
#ifdef __cplusplus
extern "C" {
#endif
/* Functions in H5.c */
/**
* \ingroup H5
* \brief Initializes the HDF5 library
* \return \herr_t
*
* \details H5open() initializes the HDF5 library.
*
* \details When the HDF5 library is used in a C application, the library is
* automatically initialized when the first HDf5 function call is
* issued. If one finds that an HDF5 library function is failing
* inexplicably, H5open() can be called first. It is safe to call
* H5open() before an application issues any other function calls to
* the HDF5 library as there are no damaging side effects in calling
* it more than once.
*/
H5_DLL herr_t H5open(void);
/**
* \ingroup H5
* \brief Registers a callback for the library to invoke when it's closing.
* \param[in] func The function pointer to invoke
* \param[in] ctx Context to pass to \p func when invoked
* \return \herr_t
*
* \details H5atclose() registers a callback that the HDF5 library will invoke
* when closing. The full capabilities of the HDF5 library are
* available to callbacks invoked through this mechanism, library
* shutdown will only begin in earnest when all callbacks have been
* invoked and have returned.
*
* Registered callbacks are invoked in LIFO order, similar to the
* Standard C 'atexit' routine. For example, if 'func1' is registered,
* then 'func2', when the library is closing 'func2' will
* be invoked first, then 'func1'.
*
* The \p ctx pointer will be passed to \p func when it's invoked.
* NULL is allowed for \p ctx.
*
* If the HDF5 library is initialized and closed more than once, the
* \p func callback must be registered within each open/close cycle.
*
* \since 1.13.0
*/
H5_DLL herr_t H5atclose(H5_atclose_func_t func, void *ctx);
/**
* \ingroup H5
* \brief Flushes all data to disk, closes all open objects, and releases memory
* \return \herr_t
*
* \details H5close() flushes all data to disk, closes all open HDF5 objects,
* and cleans up all memory used by the HDF5 library. This function is
* generally called when the application calls exit(), but may be
* called earlier in the event of an emergency shutdown or out of a
* desire to free all resources used by the HDF5 library.
*/
H5_DLL herr_t H5close(void);
/**
* \ingroup H5
* \brief Instructs library not to install atexit() cleanup routine
* \return \herr_t
*
* \details H5dont_atexit() indicates to the library that an atexit() cleanup
* routine should not be installed. The major purpose for using this
* function is in situations where the library is dynamically linked
* into an application and is un-linked from the application before
* exit() gets called. In those situations, a routine installed with
* atexit() would jump to a routine which was no longer in memory,
* causing errors.
*
* \attention In order to be effective, this routine \Emph{must} be called
* before any other HDF5 function calls, and must be called each
* time the library is loaded/linked into the application (the first
* time and after it's been un-loaded).
*/
H5_DLL herr_t H5dont_atexit(void);
/**
* \ingroup H5
* \brief Garbage collects on all free-lists of all types
* \return \herr_t
*
* \details H5garbage_collect() walks through all garbage collection routines
* of the library, freeing any unused memory.
*
* It is not required that H5garbage_collect() be called at any
* particular time; it is only necessary in certain situations where
* the application has performed actions that cause the library to
* allocate many objects. The application should call
* H5garbage_collect() if it eventually releases those objects and
* wants to reduce the memory used by the library from the peak usage
* required.
*
* \note The library automatically garbage collects all the free lists when the
* application ends.
*/
H5_DLL herr_t H5garbage_collect(void);
/**
* \ingroup H5
* \brief Sets free-list size limits
*
* \param[in] reg_global_lim The cumulative limit, in bytes, on memory used for
* all regular free lists (Default: 1MB)
* \param[in] reg_list_lim The limit, in bytes, on memory used for each regular
* free list (Default: 64KB)
* \param[in] arr_global_lim The cumulative limit, in bytes, on memory used for
* all array free lists (Default: 4MB)
* \param[in] arr_list_lim The limit, in bytes, on memory used for each array
* free list (Default: 256KB)
* \param[in] blk_global_lim The cumulative limit, in bytes, on memory used for
* all block free lists and, separately, for all
* factory free lists (Default: 16MB)
* \param[in] blk_list_lim The limit, in bytes, on memory used for each block
* or factory free list (Default: 1MB)
* \return \herr_t
*
* \details H5set_free_list_limits() sets size limits on all types of free
* lists. The HDF5 library uses free lists internally to manage
* memory. The types of free lists used are as follows:
* \li Regular free lists manage memory for single internal data
* structures.
* \li Array free lists manage memory for arrays of internal
* data structures.
* \li Block free lists manage memory for arbitrarily-sized blocks
* of bytes.
* \li Factory free lists manage memory for fixed-size blocks of
* bytes.
*
* The parameters specify global and per-list limits; for example, \p
* reg_global_limit and \p reg_list_limit limit the accumulated size
* of all regular free lists and the size of each individual regular
* free list, respectively. Therefore, if an application sets a 1Mb
* limit on each of the global lists, up to 4Mb of total storage might
* be allocated, 1Mb for each of the regular, array, block, and
* factory type lists.
*
* The settings specified for block free lists are duplicated for
* factory free lists. Therefore, increasing the global limit on block
* free lists by x bytes will increase the potential free list memory
* usage by 2x bytes.
*
* Using a value of -1 for a limit means that no limit is set for the
* specified type of free list.
*
* \version 1.8.3 Function changed in this release to set factory free list
* memory limits.
*
* \since 1.6.0
*/
H5_DLL herr_t H5set_free_list_limits(int reg_global_lim, int reg_list_lim, int arr_global_lim,
int arr_list_lim, int blk_global_lim, int blk_list_lim);
/**
* \ingroup H5
* \brief Gets the current size of the free lists used to manage memory
*
* \param[out] reg_size The current size of all "regular" free list memory used
* \param[out] arr_size The current size of all "array" free list memory used
* \param[out] blk_size The current size of all "block" free list memory used
* \param[out] fac_size The current size of all "factory" free list memory used
* \return \herr_t
*
* \details H5get_free_list_sizes() obtains the current size of the different
* kinds of free lists that the library uses to manage memory. The
* free list sizes can be set with H5set_free_list_limits() and
* garbage collected with H5garbage_collect(). These lists are global
* for the entire library.
*
* \since 1.12.1
*/
H5_DLL herr_t H5get_free_list_sizes(size_t *reg_size, size_t *arr_size, size_t *blk_size, size_t *fac_size);
/**
* \ingroup H5
* \brief Gets the memory allocation statistics for the library
*
* \param[out] stats Memory allocation statistics
* \return \herr_t
*
* \details H5get_alloc_stats() gets the memory allocation statistics for the
* library, if the \c --enable-memory-alloc-sanity-check option was
* given when building the library. Applications can check whether
* this option was enabled detecting if the
* \c H5_MEMORY_ALLOC_SANITY_CHECK macro is defined. This option is
* enabled by default for debug builds of the library and disabled by
* default for non-debug builds. If the option is not enabled, all the
* values returned with be 0. These statistics are global for the
* entire library, but do not include allocations from chunked dataset
* I/O filters or non-native VOL connectors.
*
* \since 1.12.1
*/
H5_DLL herr_t H5get_alloc_stats(H5_alloc_stats_t *stats);
/**
* \ingroup H5
* \brief Returns the HDF library release number
*
* \param[out] majnum The major version number of the library
* \param[out] minnum The minor version number of the library
* \param[out] relnum The release version number of the library
* \return \herr_t
*
* \details H5get_libversion() retrieves the major, minor, and release numbers
* of the version of the HDF5 library which is linked to the
* application.
*
*/
H5_DLL herr_t H5get_libversion(unsigned *majnum, unsigned *minnum, unsigned *relnum);
/**
* \ingroup H5
* \brief Verifies that HDF5 library versions are consistent
*
* \param[in] majnum HDF5 library major version number
* \param[in] minnum HDF5 library minor version number
* \param[in] relnum HDF5 library release number
* \return \herr_t
*
* \details H5check_version() verifies that the version of the HDF5 library
* with which an application was compiled, as indicated by the passed
* parameters, matches the version of the HDF5 library against which
* the application is currently linked.
*
* \p majnum is the major version number of the HDF library with which
* the application was compiled, \p minnum is the minor version
* number, and \p relnum is the release number. Consider the following
* example:
*
* An official HDF5 release is labelled as follows:
* HDF5 Release \Code{\<majnum\>.\<minnum\>.\<relnum\>}\n
* For example, in HDF5 Release 1.8.5:
* \li 1 is the major version number, \p majnum.
* \li 8 is the minor version number, \p minnum.
* \li 5 is the release number, \p relnum.
*
* As stated above, H5check_version() first verifies that the version
* of the HDF5 library with which an application was compiled matches
* the version of the HDF5 library against which the application is
* currently linked. If this check fails, H5check_version() causes the
* application to abort (by means of a standard C abort() call) and
* prints information that is usually useful for debugging. This
* precaution is is taken to avoid the risks of data corruption or
* segmentation faults.
*
* The most common cause of this failure is that an application was
* compiled with one version of HDF5 and is dynamically linked with a
* different version different version.
*
* If the above test passes, H5check_version() proceeds to verify the
* consistency of additional library version information. This is
* designed to catch source code inconsistencies that do not normally
* cause failures; if this check reveals an inconsistency, an
* informational warning is printed but the application is allowed to
* run.
*
*/
H5_DLL herr_t H5check_version(unsigned majnum, unsigned minnum, unsigned relnum);
/**
* \ingroup H5
* \brief Checks whether the HDF5 library is closing.
* \param[out] is_terminating Flag indicating whether library is shutting down
* \return \herr_t
*
* \details H5is_library_terminating() queries whether the HDF5 library is in
* the process of shutting down. The \p is_terminating flag will only
* be set to TRUE after shutdown starts, it will be FALSE before the
* library has been initialized, while the library is initialized, and
* after it has been closed. The value of \p is_terminating is
* undefined if this routine fails.
*
* \since 1.13.0
*/
H5_DLL herr_t H5is_library_terminating(hbool_t *is_terminating);
/**
* \ingroup H5
* \brief Determines whether the HDF5 library was built with the thread-safety
* feature enabled
*
* \param[out] is_ts Boolean value indicating whether the library was built
* with thread-safety enabled
* \return \herr_t
*
* \details The HDF5 library, although not internally multi-threaded, can be
* built with a thread-safety feature enabled that protects internal
* data structures with a mutex. In certain circumstances, it may be
* useful to determine, at run-time, whether the linked HDF5 library
* was built with the thread-safety feature enabled.
*/
H5_DLL herr_t H5is_library_threadsafe(hbool_t *is_ts);
/**
* \ingroup H5
* \brief Frees memory allocated by the HDF5 library
*
* \param[in] mem Buffer to be freed. Can be NULL
* \return \herr_t
*
* \details H5free_memory() frees memory that has been allocated by the caller
* with H5allocate_memory() or by the HDF5 library on behalf of the
* caller.
*
* H5Tget_member_name() provides an example of memory allocation on
* behalf of the caller: The function returns a buffer containing the
* name of a compound datatype member. It is the caller’s
* responsibility to eventually free that buffer with H5free_memory().
*
* \attention It is especially important to use this function to free memory
* allocated by the library on Windows. The C standard library is
* implemented in dynamic link libraries (DLLs) known as the C
* run-time (CRT). Each version of Visual Studio comes with two CRT
* DLLs (debug and release) and allocating and freeing across DLL
* boundaries can cause resource leaks and subtle bugs due to heap
* corruption.\n
* Only use this function to free memory allocated by the HDF5
* Library. It will generally not be safe to use this function to
* free memory allocated by any other means.\n
* Even when using this function, it is still best to ensure that
* all components of a C application are built with the same version
* of Visual Studio and build (debug or release) and thus linked
* against the same CRT.
*
* \see H5allocate_memory(), H5resize_memory()
*
* \since 1.8.13
*
*/
H5_DLL herr_t H5free_memory(void *mem);
/**
* \ingroup H5
* \brief Frees memory allocated by the HDF5 library
*
* \param[in] size The size in bytes of the buffer to be allocated
* \param[in] clear Flag whether the new buffer is to be initialized with 0
*
* \return On success, returns pointer to newly allocated buffer or returns
* NULL if size is 0 (zero).\n
* Returns NULL on failure.
*
* \details H5allocate_memory() allocates a memory buffer of size bytes that
* will later be freed internally by the HDF5 library.
*
* The boolean \p clear parameter specifies whether the buffer should
* be initialized. If clear is \c TRUE, all bits in the buffer are to be
* set to 0 (zero); if clear is \c FALSE, the buffer will not be
* initialized.
*
* This function is intended to have the semantics of malloc() and
* calloc(). However, unlike malloc() and calloc() which allow for a
* "special" pointer to be returned instead of NULL, this function
* always returns NULL on failure or when size is set to 0 (zero).
*
* \note At this time, the only intended use for this function is to allocate
* memory that will be returned to the library as a data buffer from a
* third-party filter.
*
* \attention To avoid heap corruption, allocated memory should be freed using
* the same library that initially allocated it. In most cases, the
* HDF5 API uses resources that are allocated and freed either
* entirely by the user or entirely by the library, so this is not a
* problem. In rare cases, however, HDF5 API calls will free memory
* that the user allocated. This function allows the user to safely
* allocate this memory.\n
* It is particularly important to use this function to allocate
* memory in Microsoft Windows environments. In Windows, the C
* standard library is implemented in dynamic link libraries (DLLs)
* known as the C run-time (CRT). Each version of Visual Studio
* comes with multiple versions of the CRT DLLs (debug, release, et
* cetera) and allocating and freeing memory across DLL boundaries
* can cause resource leaks and subtle bugs due to heap corruption.\n
* Even when using this function, it is best where possible to
* ensure that all components of a C application are built with the
* same version of Visual Studio and configuration (Debug or
* Release), and thus linked against the same CRT.\n
* Use this function only to allocate memory inside third-party HDF5
* filters. It will generally not be safe to use this function to
* allocate memory for any other purpose.
*
* \see H5free_memory(), H5resize_memory()
*
* \since 1.8.15
*
*/
H5_DLL void *H5allocate_memory(size_t size, hbool_t clear);
/**
* \ingroup H5
* \brief Resizes and, if required, re-allocates memory that will later be
* freed internally by the HDF5 library
*
* \param[in] mem Pointer to a buffer to be resized. May be NULL
* \param[in] size New size of the buffer, in bytes
*
* \return On success, returns pointer to resized or reallocated buffer
* or returns NULL if size is 0 (zero).\n
* Returns NULL on failure.
*
* \details H5resize_memory() takes a pointer to an existing buffer and resizes
* the buffer to match the value in \p size. If necessary, the buffer
* is reallocated. If \p size is 0, the buffer is released.
*
* The input buffer must either be NULL or have been allocated by
* H5allocate_memory() since the input buffer may be freed by the
* library.
*
* For certain behaviors, the pointer \p mem may be passed in as NULL.
*
* This function is intended to have the semantics of realloc():
*
* <table>
* <tr><td>\Code{H5resize_memory(buffer, size)}</td>
* <td>Resizes buffer. Returns pointer to resized buffer.</td></tr>
* <tr><td>\Code{H5resize_memory(NULL, size)}</td>
* <td>Allocates memory using HDF5 Library allocator.
* Returns pointer to new buffer</td></tr>
* <tr><td>\Code{H5resize_memory(buffer, 0)}</td>
* <td>Frees memory using HDF5 Library allocator.
* Returns NULL.</td></tr>
* <tr><td>\Code{H5resize_memory(NULL, 0)}</td>
* <td>Returns NULL (undefined in C standard).</td></tr>
* </table>
*
* Unlike realloc(), which allows for a "special pointer to be
* returned instead of NULL, this function always returns NULL on
* failure or when size is 0 (zero).
*
* \note At this time, the only intended use for this function is to resize or
* reallocate memory that will be returned to the library (and eventually
* to the user) as a data buffer from a third-party HDF5 filter.
*
* \attention To avoid heap corruption, allocated memory should be freed using
* the same library that initially allocated it. In most cases, the
* HDF5 API uses resources that are allocated and freed either
* entirely by the user or entirely by the library, so this is not a
* problem. In rare cases, however, HDF5 API calls will free memory
* that the user allocated. This function allows the user to safely
* allocate this memory.\n
* It is particularly important to use this function to resize
* memory on Microsoft Windows systems. In Windows, the C standard
* library is implemented in dynamic link libraries (DLLs) known as
* the C run-time (CRT). Each version of Visual Studio comes with
* multiple versions of the CRT DLLs (debug, release, et cetera) and
* allocating and freeing memory across DLL boundaries can cause
* resource leaks and subtle bugs due to heap corruption.\n
* Even when using this function, it is still best to ensure that
* all components of a C application are built with the same version
* of Visual Studio and the same configuration (Debug or Release),
* and thus linked against the same CRT.\n
* Only use this function to resize memory inside third-party HDF5
* filters. It will generally not be safe to use this function to
* resize memory for any other purpose.
*
* \see H5allocate_memory(), H5free_memory()
*
* \since 1.8.15
*
*/
H5_DLL void *H5resize_memory(void *mem, size_t size);
#ifdef __cplusplus
}
#endif
#endif /* H5public_H */
|