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hsearch.h File Reference
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Data Structures

struct  HASHELEMENT
 
struct  HASHCTL
 
struct  HASH_SEQ_STATUS
 

Macros

#define HASH_PARTITION   0x0001 /* Hashtable is used w/partitioned locking */
 
#define HASH_SEGMENT   0x0002 /* Set segment size */
 
#define HASH_DIRSIZE   0x0004 /* Set directory size (initial and max) */
 
#define HASH_ELEM   0x0010 /* Set keysize and entrysize */
 
#define HASH_BLOBS   0x0020 /* Select support functions for binary keys */
 
#define HASH_FUNCTION   0x0040 /* Set user defined hash function */
 
#define HASH_COMPARE   0x0080 /* Set user defined comparison function */
 
#define HASH_KEYCOPY   0x0100 /* Set user defined key-copying function */
 
#define HASH_ALLOC   0x0200 /* Set memory allocator */
 
#define HASH_CONTEXT   0x0400 /* Set memory allocation context */
 
#define HASH_SHARED_MEM   0x0800 /* Hashtable is in shared memory */
 
#define HASH_ATTACH   0x1000 /* Do not initialize hctl */
 
#define HASH_FIXED_SIZE   0x2000 /* Initial size is a hard limit */
 
#define NO_MAX_DSIZE   (-1)
 

Typedefs

typedef uint32(* HashValueFunc) (const void *key, Size keysize)
 
typedef int(* HashCompareFunc) (const void *key1, const void *key2, Size keysize)
 
typedef void *(* HashCopyFunc) (void *dest, const void *src, Size keysize)
 
typedef void *(* HashAllocFunc) (Size request)
 
typedef struct HASHELEMENT HASHELEMENT
 
typedef struct HASHHDR HASHHDR
 
typedef struct HTAB HTAB
 
typedef struct HASHCTL HASHCTL
 

Enumerations

enum  HASHACTION { HASH_FIND, HASH_ENTER, HASH_REMOVE, HASH_ENTER_NULL }
 

Functions

HTABhash_create (const char *tabname, long nelem, HASHCTL *info, int flags)
 
void hash_destroy (HTAB *hashp)
 
void hash_stats (const char *where, HTAB *hashp)
 
void * hash_search (HTAB *hashp, const void *keyPtr, HASHACTION action, bool *foundPtr)
 
uint32 get_hash_value (HTAB *hashp, const void *keyPtr)
 
void * hash_search_with_hash_value (HTAB *hashp, const void *keyPtr, uint32 hashvalue, HASHACTION action, bool *foundPtr)
 
bool hash_update_hash_key (HTAB *hashp, void *existingEntry, const void *newKeyPtr)
 
long hash_get_num_entries (HTAB *hashp)
 
void hash_seq_init (HASH_SEQ_STATUS *status, HTAB *hashp)
 
void * hash_seq_search (HASH_SEQ_STATUS *status)
 
void hash_seq_term (HASH_SEQ_STATUS *status)
 
void hash_freeze (HTAB *hashp)
 
Size hash_estimate_size (long num_entries, Size entrysize)
 
long hash_select_dirsize (long num_entries)
 
Size hash_get_shared_size (HASHCTL *info, int flags)
 
void AtEOXact_HashTables (bool isCommit)
 
void AtEOSubXact_HashTables (bool isCommit, int nestDepth)
 

Macro Definition Documentation

◆ HASH_ALLOC

#define HASH_ALLOC   0x0200 /* Set memory allocator */

Definition at line 90 of file hsearch.h.

Referenced by hash_create(), and ShmemInitHash().

◆ HASH_ATTACH

#define HASH_ATTACH   0x1000 /* Do not initialize hctl */

Definition at line 93 of file hsearch.h.

Referenced by hash_create(), and ShmemInitHash().

◆ HASH_BLOBS

#define HASH_BLOBS   0x0020 /* Select support functions for binary keys */

Definition at line 86 of file hsearch.h.

Referenced by _hash_finish_split(), _PG_init(), AddPendingSync(), begin_heap_rewrite(), BuildEventTriggerCache(), CompactCheckpointerRequestQueue(), compute_array_stats(), create_seq_hashtable(), CreateLocalPredicateLockHash(), CreatePartitionDirectory(), do_autovacuum(), ExecHashSubPlanResultRelsByOid(), find_all_inheritors(), find_oper_cache_entry(), get_tabstat_entry(), GetComboCommandId(), GetConnection(), gistInitBuildBuffers(), gistInitParentMap(), hash_create(), init_enum_blacklist(), init_procedure_caches(), init_rel_sync_cache(), init_ts_config_cache(), InitBufferPoolAccess(), InitBufTable(), InitializeAttoptCache(), InitializeRelfilenodeMap(), InitializeShippableCache(), InitializeTableSpaceCache(), InitLocalBuffers(), InitLocks(), InitPredicateLocks(), InitRecoveryTransactionEnvironment(), InitSync(), log_invalid_page(), logical_begin_heap_rewrite(), logicalrep_partmap_init(), logicalrep_relmap_init(), lookup_collation_cache(), lookup_proof_cache(), lookup_ts_dictionary_cache(), lookup_ts_parser_cache(), lookup_type_cache(), LookupOpclassInfo(), pgss_shmem_startup(), pgstat_collect_oids(), pgstat_init_function_usage(), pgstat_read_statsfiles(), plpgsql_estate_setup(), plpgsql_HashTableInit(), PLy_add_exceptions(), process_syncing_tables_for_apply(), rebuild_database_list(), record_C_func(), RelationCacheInitialize(), ReorderBufferAllocate(), ReorderBufferBuildTupleCidHash(), ReorderBufferToastInitHash(), reset_dbentry_counters(), ri_InitHashTables(), SerializePendingSyncs(), smgropen(), and transformGraph().

◆ HASH_COMPARE

#define HASH_COMPARE   0x0080 /* Set user defined comparison function */

◆ HASH_CONTEXT

◆ HASH_DIRSIZE

#define HASH_DIRSIZE   0x0004 /* Set directory size (initial and max) */

Definition at line 84 of file hsearch.h.

Referenced by hash_create(), hash_get_shared_size(), and ShmemInitHash().

◆ HASH_ELEM

#define HASH_ELEM   0x0010 /* Set keysize and entrysize */

Definition at line 85 of file hsearch.h.

Referenced by _hash_finish_split(), _PG_init(), AddEventToPendingNotifies(), AddPendingSync(), apply_handle_stream_start(), assign_record_type_typmod(), begin_heap_rewrite(), build_join_rel_hash(), BuildEventTriggerCache(), CompactCheckpointerRequestQueue(), compute_array_stats(), compute_tsvector_stats(), create_seq_hashtable(), createConnHash(), CreateLocalPredicateLockHash(), CreatePartitionDirectory(), do_autovacuum(), EnablePortalManager(), ExecHashSubPlanResultRelsByOid(), find_all_inheritors(), find_oper_cache_entry(), find_rendezvous_variable(), get_json_object_as_hash(), get_tabstat_entry(), GetComboCommandId(), GetConnection(), gistInitBuildBuffers(), gistInitParentMap(), hash_create(), init_enum_blacklist(), init_procedure_caches(), init_rel_sync_cache(), init_timezone_hashtable(), init_ts_config_cache(), InitBufferPoolAccess(), InitBufTable(), InitializeAttoptCache(), InitializeRelfilenodeMap(), InitializeShippableCache(), InitializeTableSpaceCache(), InitLocalBuffers(), InitLocks(), InitPredicateLocks(), InitQueryHashTable(), InitRecoveryTransactionEnvironment(), InitShmemIndex(), InitSync(), load_categories_hash(), log_invalid_page(), logical_begin_heap_rewrite(), logicalrep_partmap_init(), logicalrep_relmap_init(), lookup_collation_cache(), lookup_proof_cache(), lookup_ts_dictionary_cache(), lookup_ts_parser_cache(), lookup_type_cache(), LookupOpclassInfo(), pgss_shmem_startup(), pgstat_collect_oids(), pgstat_init_function_usage(), pgstat_read_statsfiles(), plpgsql_estate_setup(), plpgsql_HashTableInit(), PLy_add_exceptions(), populate_recordset_object_start(), process_syncing_tables_for_apply(), rebuild_database_list(), record_C_func(), RegisterExtensibleNodeEntry(), RelationCacheInitialize(), ReorderBufferAllocate(), ReorderBufferBuildTupleCidHash(), ReorderBufferToastInitHash(), reset_dbentry_counters(), ResetUnloggedRelationsInDbspaceDir(), ri_InitHashTables(), select_perl_context(), SerializePendingSyncs(), set_rtable_names(), smgropen(), and transformGraph().

◆ HASH_FIXED_SIZE

#define HASH_FIXED_SIZE   0x2000 /* Initial size is a hard limit */

Definition at line 94 of file hsearch.h.

Referenced by hash_create(), and InitPredicateLocks().

◆ HASH_FUNCTION

#define HASH_FUNCTION   0x0040 /* Set user defined hash function */

◆ HASH_KEYCOPY

#define HASH_KEYCOPY   0x0100 /* Set user defined key-copying function */

Definition at line 89 of file hsearch.h.

Referenced by hash_create().

◆ HASH_PARTITION

#define HASH_PARTITION   0x0001 /* Hashtable is used w/partitioned locking */

Definition at line 82 of file hsearch.h.

Referenced by hash_create(), InitBufTable(), InitLocks(), and InitPredicateLocks().

◆ HASH_SEGMENT

#define HASH_SEGMENT   0x0002 /* Set segment size */

Definition at line 83 of file hsearch.h.

Referenced by hash_create().

◆ HASH_SHARED_MEM

#define HASH_SHARED_MEM   0x0800 /* Hashtable is in shared memory */

Definition at line 92 of file hsearch.h.

Referenced by hash_create(), and ShmemInitHash().

◆ NO_MAX_DSIZE

#define NO_MAX_DSIZE   (-1)

Definition at line 98 of file hsearch.h.

Referenced by dir_realloc(), and hdefault().

Typedef Documentation

◆ HashAllocFunc

typedef void*(* HashAllocFunc) (Size request)

Definition at line 44 of file hsearch.h.

◆ HashCompareFunc

typedef int(* HashCompareFunc) (const void *key1, const void *key2, Size keysize)

Definition at line 29 of file hsearch.h.

◆ HashCopyFunc

typedef void*(* HashCopyFunc) (void *dest, const void *src, Size keysize)

Definition at line 37 of file hsearch.h.

◆ HASHCTL

typedef struct HASHCTL HASHCTL

◆ HASHELEMENT

typedef struct HASHELEMENT HASHELEMENT

◆ HASHHDR

typedef struct HASHHDR HASHHDR

Definition at line 58 of file hsearch.h.

◆ HashValueFunc

typedef uint32(* HashValueFunc) (const void *key, Size keysize)

Definition at line 21 of file hsearch.h.

◆ HTAB

typedef struct HTAB HTAB

Definition at line 61 of file hsearch.h.

Enumeration Type Documentation

◆ HASHACTION

enum HASHACTION
Enumerator
HASH_FIND 
HASH_ENTER 
HASH_REMOVE 
HASH_ENTER_NULL 

Definition at line 101 of file hsearch.h.

102 {
103  HASH_FIND,
104  HASH_ENTER,
105  HASH_REMOVE,
107 } HASHACTION;
HASHACTION
Definition: hsearch.h:101

Function Documentation

◆ AtEOSubXact_HashTables()

void AtEOSubXact_HashTables ( bool  isCommit,
int  nestDepth 
)

Definition at line 1874 of file dynahash.c.

References elog, i, num_seq_scans, seq_scan_level, and WARNING.

Referenced by AbortSubTransaction(), and CommitSubTransaction().

1875 {
1876  int i;
1877 
1878  /*
1879  * Search backward to make cleanup easy. Note we must check all entries,
1880  * not only those at the end of the array, because deletion technique
1881  * doesn't keep them in order.
1882  */
1883  for (i = num_seq_scans - 1; i >= 0; i--)
1884  {
1885  if (seq_scan_level[i] >= nestDepth)
1886  {
1887  if (isCommit)
1888  elog(WARNING, "leaked hash_seq_search scan for hash table %p",
1889  seq_scan_tables[i]);
1892  num_seq_scans--;
1893  }
1894  }
1895 }
static int seq_scan_level[MAX_SEQ_SCANS]
Definition: dynahash.c:1795
#define WARNING
Definition: elog.h:40
static int num_seq_scans
Definition: dynahash.c:1796
static HTAB * seq_scan_tables[MAX_SEQ_SCANS]
Definition: dynahash.c:1794
#define elog(elevel,...)
Definition: elog.h:214
int i

◆ AtEOXact_HashTables()

void AtEOXact_HashTables ( bool  isCommit)

Definition at line 1848 of file dynahash.c.

References elog, i, num_seq_scans, and WARNING.

Referenced by AbortTransaction(), AutoVacLauncherMain(), BackgroundWriterMain(), CheckpointerMain(), CommitTransaction(), PrepareTransaction(), and WalWriterMain().

1849 {
1850  /*
1851  * During abort cleanup, open scans are expected; just silently clean 'em
1852  * out. An open scan at commit means someone forgot a hash_seq_term()
1853  * call, so complain.
1854  *
1855  * Note: it's tempting to try to print the tabname here, but refrain for
1856  * fear of touching deallocated memory. This isn't a user-facing message
1857  * anyway, so it needn't be pretty.
1858  */
1859  if (isCommit)
1860  {
1861  int i;
1862 
1863  for (i = 0; i < num_seq_scans; i++)
1864  {
1865  elog(WARNING, "leaked hash_seq_search scan for hash table %p",
1866  seq_scan_tables[i]);
1867  }
1868  }
1869  num_seq_scans = 0;
1870 }
#define WARNING
Definition: elog.h:40
static int num_seq_scans
Definition: dynahash.c:1796
static HTAB * seq_scan_tables[MAX_SEQ_SCANS]
Definition: dynahash.c:1794
#define elog(elevel,...)
Definition: elog.h:214
int i

◆ get_hash_value()

uint32 get_hash_value ( HTAB hashp,
const void *  keyPtr 
)

Definition at line 873 of file dynahash.c.

References HTAB::hash, and HTAB::keysize.

Referenced by BufTableHashCode(), and LockTagHashCode().

874 {
875  return hashp->hash(keyPtr, hashp->keysize);
876 }
Size keysize
Definition: dynahash.c:235
HashValueFunc hash
Definition: dynahash.c:222

◆ hash_create()

HTAB* hash_create ( const char *  tabname,
long  nelem,
HASHCTL info,
int  flags 
)

Definition at line 326 of file dynahash.c.

References HASHCTL::alloc, HTAB::alloc, ALLOCSET_DEFAULT_SIZES, AllocSetContextCreate, Assert, CurrentDynaHashCxt, HTAB::dir, HASHCTL::dsize, HASHHDR::dsize, DynaHashAlloc(), element_alloc(), elog, HASHCTL::entrysize, HASHHDR::entrysize, ereport, errcode(), errmsg(), ERROR, HTAB::frozen, HASHCTL::hash, HTAB::hash, HASH_ALLOC, HASH_ATTACH, HASH_BLOBS, HASH_COMPARE, HASH_CONTEXT, HASH_DIRSIZE, HASH_ELEM, HASH_FIXED_SIZE, HASH_FUNCTION, HASH_KEYCOPY, HASH_PARTITION, HASH_SEGMENT, HASH_SHARED_MEM, HASHCTL::hctl, HTAB::hctl, HASHCTL::hcxt, HTAB::hcxt, hdefault(), i, init_htab(), IS_PARTITIONED, HTAB::isfixed, HTAB::isshared, HASHCTL::keycopy, HTAB::keycopy, HASHCTL::keysize, HASHHDR::keysize, HTAB::keysize, HASHCTL::match, HTAB::match, HASHCTL::max_dsize, HASHHDR::max_dsize, MemoryContextSetIdentifier(), MemSet, my_log2(), HASHHDR::nelem_alloc, next_pow2_int(), NUM_FREELISTS, HASHCTL::num_partitions, HASHHDR::num_partitions, HASHHDR::sshift, HTAB::sshift, HASHCTL::ssize, HASHHDR::ssize, HTAB::ssize, string_compare(), string_hash(), strlcpy(), HTAB::tabname, tag_hash(), TopMemoryContext, and uint32_hash().

Referenced by _hash_finish_split(), _PG_init(), AddEventToPendingNotifies(), AddPendingSync(), apply_handle_stream_start(), assign_record_type_typmod(), begin_heap_rewrite(), build_join_rel_hash(), BuildEventTriggerCache(), CompactCheckpointerRequestQueue(), compute_array_stats(), compute_tsvector_stats(), create_seq_hashtable(), createConnHash(), CreateLocalPredicateLockHash(), CreatePartitionDirectory(), do_autovacuum(), EnablePortalManager(), ExecHashSubPlanResultRelsByOid(), find_all_inheritors(), find_oper_cache_entry(), find_rendezvous_variable(), get_json_object_as_hash(), get_tabstat_entry(), GetComboCommandId(), GetConnection(), gistInitBuildBuffers(), gistInitParentMap(), init_enum_blacklist(), init_procedure_caches(), init_rel_sync_cache(), init_timezone_hashtable(), init_ts_config_cache(), InitBufferPoolAccess(), InitializeAttoptCache(), InitializeRelfilenodeMap(), InitializeShippableCache(), InitializeTableSpaceCache(), InitLocalBuffers(), InitLocks(), InitQueryHashTable(), InitRecoveryTransactionEnvironment(), InitSync(), load_categories_hash(), log_invalid_page(), logical_begin_heap_rewrite(), logicalrep_partmap_init(), logicalrep_relmap_init(), lookup_collation_cache(), lookup_proof_cache(), lookup_ts_dictionary_cache(), lookup_ts_parser_cache(), lookup_type_cache(), LookupOpclassInfo(), pgstat_collect_oids(), pgstat_init_function_usage(), pgstat_read_statsfiles(), plpgsql_estate_setup(), plpgsql_HashTableInit(), PLy_add_exceptions(), populate_recordset_object_start(), process_syncing_tables_for_apply(), rebuild_database_list(), record_C_func(), RegisterExtensibleNodeEntry(), RelationCacheInitialize(), ReorderBufferAllocate(), ReorderBufferBuildTupleCidHash(), ReorderBufferToastInitHash(), reset_dbentry_counters(), ResetUnloggedRelationsInDbspaceDir(), ri_InitHashTables(), select_perl_context(), SerializePendingSyncs(), set_rtable_names(), ShmemInitHash(), smgropen(), and transformGraph().

327 {
328  HTAB *hashp;
329  HASHHDR *hctl;
330 
331  /*
332  * For shared hash tables, we have a local hash header (HTAB struct) that
333  * we allocate in TopMemoryContext; all else is in shared memory.
334  *
335  * For non-shared hash tables, everything including the hash header is in
336  * a memory context created specially for the hash table --- this makes
337  * hash_destroy very simple. The memory context is made a child of either
338  * a context specified by the caller, or TopMemoryContext if nothing is
339  * specified.
340  */
341  if (flags & HASH_SHARED_MEM)
342  {
343  /* Set up to allocate the hash header */
345  }
346  else
347  {
348  /* Create the hash table's private memory context */
349  if (flags & HASH_CONTEXT)
350  CurrentDynaHashCxt = info->hcxt;
351  else
354  "dynahash",
356  }
357 
358  /* Initialize the hash header, plus a copy of the table name */
359  hashp = (HTAB *) DynaHashAlloc(sizeof(HTAB) + strlen(tabname) + 1);
360  MemSet(hashp, 0, sizeof(HTAB));
361 
362  hashp->tabname = (char *) (hashp + 1);
363  strcpy(hashp->tabname, tabname);
364 
365  /* If we have a private context, label it with hashtable's name */
366  if (!(flags & HASH_SHARED_MEM))
368 
369  /*
370  * Select the appropriate hash function (see comments at head of file).
371  */
372  if (flags & HASH_FUNCTION)
373  hashp->hash = info->hash;
374  else if (flags & HASH_BLOBS)
375  {
376  /* We can optimize hashing for common key sizes */
378  if (info->keysize == sizeof(uint32))
379  hashp->hash = uint32_hash;
380  else
381  hashp->hash = tag_hash;
382  }
383  else
384  hashp->hash = string_hash; /* default hash function */
385 
386  /*
387  * If you don't specify a match function, it defaults to string_compare if
388  * you used string_hash (either explicitly or by default) and to memcmp
389  * otherwise.
390  *
391  * Note: explicitly specifying string_hash is deprecated, because this
392  * might not work for callers in loadable modules on some platforms due to
393  * referencing a trampoline instead of the string_hash function proper.
394  * Just let it default, eh?
395  */
396  if (flags & HASH_COMPARE)
397  hashp->match = info->match;
398  else if (hashp->hash == string_hash)
400  else
401  hashp->match = memcmp;
402 
403  /*
404  * Similarly, the key-copying function defaults to strlcpy or memcpy.
405  */
406  if (flags & HASH_KEYCOPY)
407  hashp->keycopy = info->keycopy;
408  else if (hashp->hash == string_hash)
409  {
410  /*
411  * The signature of keycopy is meant for memcpy(), which returns
412  * void*, but strlcpy() returns size_t. Since we never use the return
413  * value of keycopy, and size_t is pretty much always the same size as
414  * void *, this should be safe. The extra cast in the middle is to
415  * avoid warnings from -Wcast-function-type.
416  */
418  }
419  else
420  hashp->keycopy = memcpy;
421 
422  /* And select the entry allocation function, too. */
423  if (flags & HASH_ALLOC)
424  hashp->alloc = info->alloc;
425  else
426  hashp->alloc = DynaHashAlloc;
427 
428  if (flags & HASH_SHARED_MEM)
429  {
430  /*
431  * ctl structure and directory are preallocated for shared memory
432  * tables. Note that HASH_DIRSIZE and HASH_ALLOC had better be set as
433  * well.
434  */
435  hashp->hctl = info->hctl;
436  hashp->dir = (HASHSEGMENT *) (((char *) info->hctl) + sizeof(HASHHDR));
437  hashp->hcxt = NULL;
438  hashp->isshared = true;
439 
440  /* hash table already exists, we're just attaching to it */
441  if (flags & HASH_ATTACH)
442  {
443  /* make local copies of some heavily-used values */
444  hctl = hashp->hctl;
445  hashp->keysize = hctl->keysize;
446  hashp->ssize = hctl->ssize;
447  hashp->sshift = hctl->sshift;
448 
449  return hashp;
450  }
451  }
452  else
453  {
454  /* setup hash table defaults */
455  hashp->hctl = NULL;
456  hashp->dir = NULL;
457  hashp->hcxt = CurrentDynaHashCxt;
458  hashp->isshared = false;
459  }
460 
461  if (!hashp->hctl)
462  {
463  hashp->hctl = (HASHHDR *) hashp->alloc(sizeof(HASHHDR));
464  if (!hashp->hctl)
465  ereport(ERROR,
466  (errcode(ERRCODE_OUT_OF_MEMORY),
467  errmsg("out of memory")));
468  }
469 
470  hashp->frozen = false;
471 
472  hdefault(hashp);
473 
474  hctl = hashp->hctl;
475 
476  if (flags & HASH_PARTITION)
477  {
478  /* Doesn't make sense to partition a local hash table */
479  Assert(flags & HASH_SHARED_MEM);
480 
481  /*
482  * The number of partitions had better be a power of 2. Also, it must
483  * be less than INT_MAX (see init_htab()), so call the int version of
484  * next_pow2.
485  */
487 
488  hctl->num_partitions = info->num_partitions;
489  }
490 
491  if (flags & HASH_SEGMENT)
492  {
493  hctl->ssize = info->ssize;
494  hctl->sshift = my_log2(info->ssize);
495  /* ssize had better be a power of 2 */
496  Assert(hctl->ssize == (1L << hctl->sshift));
497  }
498 
499  /*
500  * SHM hash tables have fixed directory size passed by the caller.
501  */
502  if (flags & HASH_DIRSIZE)
503  {
504  hctl->max_dsize = info->max_dsize;
505  hctl->dsize = info->dsize;
506  }
507 
508  /*
509  * hash table now allocates space for key and data but you have to say how
510  * much space to allocate
511  */
512  if (flags & HASH_ELEM)
513  {
514  Assert(info->entrysize >= info->keysize);
515  hctl->keysize = info->keysize;
516  hctl->entrysize = info->entrysize;
517  }
518 
519  /* make local copies of heavily-used constant fields */
520  hashp->keysize = hctl->keysize;
521  hashp->ssize = hctl->ssize;
522  hashp->sshift = hctl->sshift;
523 
524  /* Build the hash directory structure */
525  if (!init_htab(hashp, nelem))
526  elog(ERROR, "failed to initialize hash table \"%s\"", hashp->tabname);
527 
528  /*
529  * For a shared hash table, preallocate the requested number of elements.
530  * This reduces problems with run-time out-of-shared-memory conditions.
531  *
532  * For a non-shared hash table, preallocate the requested number of
533  * elements if it's less than our chosen nelem_alloc. This avoids wasting
534  * space if the caller correctly estimates a small table size.
535  */
536  if ((flags & HASH_SHARED_MEM) ||
537  nelem < hctl->nelem_alloc)
538  {
539  int i,
540  freelist_partitions,
541  nelem_alloc,
542  nelem_alloc_first;
543 
544  /*
545  * If hash table is partitioned, give each freelist an equal share of
546  * the initial allocation. Otherwise only freeList[0] is used.
547  */
548  if (IS_PARTITIONED(hashp->hctl))
549  freelist_partitions = NUM_FREELISTS;
550  else
551  freelist_partitions = 1;
552 
553  nelem_alloc = nelem / freelist_partitions;
554  if (nelem_alloc <= 0)
555  nelem_alloc = 1;
556 
557  /*
558  * Make sure we'll allocate all the requested elements; freeList[0]
559  * gets the excess if the request isn't divisible by NUM_FREELISTS.
560  */
561  if (nelem_alloc * freelist_partitions < nelem)
562  nelem_alloc_first =
563  nelem - nelem_alloc * (freelist_partitions - 1);
564  else
565  nelem_alloc_first = nelem_alloc;
566 
567  for (i = 0; i < freelist_partitions; i++)
568  {
569  int temp = (i == 0) ? nelem_alloc_first : nelem_alloc;
570 
571  if (!element_alloc(hashp, temp, i))
572  ereport(ERROR,
573  (errcode(ERRCODE_OUT_OF_MEMORY),
574  errmsg("out of memory")));
575  }
576  }
577 
578  if (flags & HASH_FIXED_SIZE)
579  hashp->isfixed = true;
580  return hashp;
581 }
int(* HashCompareFunc)(const void *key1, const void *key2, Size keysize)
Definition: hsearch.h:29
Size keysize
Definition: dynahash.c:190
Size keysize
Definition: dynahash.c:235
long dsize
Definition: dynahash.c:183
#define AllocSetContextCreate
Definition: memutils.h:170
#define HASH_CONTEXT
Definition: hsearch.h:91
#define HASH_ELEM
Definition: hsearch.h:85
MemoryContext hcxt
Definition: hsearch.h:77
long ssize
Definition: hsearch.h:68
HashCopyFunc keycopy
Definition: hsearch.h:75
Size entrysize
Definition: dynahash.c:191
#define IS_PARTITIONED(hctl)
Definition: dynahash.c:209
uint32 string_hash(const void *key, Size keysize)
Definition: hashfn.c:660
long num_partitions
Definition: dynahash.c:192
Size entrysize
Definition: hsearch.h:72
#define NUM_FREELISTS
Definition: dynahash.c:127
int errcode(int sqlerrcode)
Definition: elog.c:610
HashAllocFunc alloc
Definition: dynahash.c:225
#define MemSet(start, val, len)
Definition: c.h:950
#define HASH_SHARED_MEM
Definition: hsearch.h:92
static int string_compare(const char *key1, const char *key2, Size keysize)
Definition: dynahash.c:303
long dsize
Definition: hsearch.h:69
uint32 uint32_hash(const void *key, Size keysize)
Definition: hashfn.c:688
#define HASH_PARTITION
Definition: hsearch.h:82
#define HASH_ATTACH
Definition: hsearch.h:93
HashValueFunc hash
Definition: dynahash.c:222
Definition: dynahash.c:218
long max_dsize
Definition: hsearch.h:70
long ssize
Definition: dynahash.c:236
#define ERROR
Definition: elog.h:43
long num_partitions
Definition: hsearch.h:67
int sshift
Definition: dynahash.c:237
#define ALLOCSET_DEFAULT_SIZES
Definition: memutils.h:192
HashAllocFunc alloc
Definition: hsearch.h:76
#define HASH_KEYCOPY
Definition: hsearch.h:89
long max_dsize
Definition: dynahash.c:193
static void hdefault(HTAB *hashp)
Definition: dynahash.c:587
HASHHDR * hctl
Definition: dynahash.c:220
unsigned int uint32
Definition: c.h:375
static bool init_htab(HTAB *hashp, long nelem)
Definition: dynahash.c:651
MemoryContext TopMemoryContext
Definition: mcxt.c:44
int my_log2(long num)
Definition: dynahash.c:1730
HashCompareFunc match
Definition: dynahash.c:223
static int next_pow2_int(long num)
Definition: dynahash.c:1756
bool isshared
Definition: dynahash.c:228
#define HASH_BLOBS
Definition: hsearch.h:86
bool frozen
Definition: dynahash.c:232
uint32 tag_hash(const void *key, Size keysize)
Definition: hashfn.c:677
long ssize
Definition: dynahash.c:194
Size keysize
Definition: hsearch.h:71
void *(* HashCopyFunc)(void *dest, const void *src, Size keysize)
Definition: hsearch.h:37
HashCompareFunc match
Definition: hsearch.h:74
MemoryContext hcxt
Definition: dynahash.c:226
#define ereport(elevel,...)
Definition: elog.h:144
HashCopyFunc keycopy
Definition: dynahash.c:224
#define HASH_SEGMENT
Definition: hsearch.h:83
size_t strlcpy(char *dst, const char *src, size_t siz)
Definition: strlcpy.c:45
#define Assert(condition)
Definition: c.h:746
#define HASH_COMPARE
Definition: hsearch.h:88
void MemoryContextSetIdentifier(MemoryContext context, const char *id)
Definition: mcxt.c:330
HASHHDR * hctl
Definition: hsearch.h:78
char * tabname
Definition: dynahash.c:227
#define HASH_FIXED_SIZE
Definition: hsearch.h:94
bool isfixed
Definition: dynahash.c:229
static void * DynaHashAlloc(Size size)
Definition: dynahash.c:288
#define HASH_DIRSIZE
Definition: hsearch.h:84
int errmsg(const char *fmt,...)
Definition: elog.c:821
#define elog(elevel,...)
Definition: elog.h:214
static MemoryContext CurrentDynaHashCxt
Definition: dynahash.c:285
int i
#define HASH_ALLOC
Definition: hsearch.h:90
void(* pg_funcptr_t)(void)
Definition: c.h:274
HASHSEGMENT * dir
Definition: dynahash.c:221
static bool element_alloc(HTAB *hashp, int nelem, int freelist_idx)
Definition: dynahash.c:1669
int sshift
Definition: dynahash.c:195
HashValueFunc hash
Definition: hsearch.h:73
#define HASH_FUNCTION
Definition: hsearch.h:87

◆ hash_destroy()

void hash_destroy ( HTAB hashp)

Definition at line 827 of file dynahash.c.

References HTAB::alloc, Assert, DynaHashAlloc(), hash_stats(), HTAB::hcxt, and MemoryContextDelete().

Referenced by _hash_finish_split(), clear_external_function_hash(), CompactCheckpointerRequestQueue(), EnableSyncRequestForwarding(), find_all_inheritors(), InitLocks(), pgoutput_shutdown(), pgstat_recv_dropdb(), pgstat_recv_resetcounter(), pgstat_report_stat(), pgstat_vacuum_stat(), populate_recordset_object_end(), PostPrepare_PredicateLocks(), process_syncing_tables_for_apply(), ReleasePredicateLocksLocal(), ReorderBufferReturnTXN(), ReorderBufferToastReset(), ReorderBufferTruncateTXN(), ResetSequenceCaches(), ResetUnloggedRelationsInDbspaceDir(), SerializePendingSyncs(), set_rtable_names(), ShutdownRecoveryTransactionEnvironment(), and XLogCheckInvalidPages().

828 {
829  if (hashp != NULL)
830  {
831  /* allocation method must be one we know how to free, too */
832  Assert(hashp->alloc == DynaHashAlloc);
833  /* so this hashtable must have its own context */
834  Assert(hashp->hcxt != NULL);
835 
836  hash_stats("destroy", hashp);
837 
838  /*
839  * Free everything by destroying the hash table's memory context.
840  */
841  MemoryContextDelete(hashp->hcxt);
842  }
843 }
void MemoryContextDelete(MemoryContext context)
Definition: mcxt.c:212
void hash_stats(const char *where, HTAB *hashp)
Definition: dynahash.c:846
HashAllocFunc alloc
Definition: dynahash.c:225
MemoryContext hcxt
Definition: dynahash.c:226
#define Assert(condition)
Definition: c.h:746
static void * DynaHashAlloc(Size size)
Definition: dynahash.c:288

◆ hash_estimate_size()

Size hash_estimate_size ( long  num_entries,
Size  entrysize 
)

Definition at line 745 of file dynahash.c.

References add_size(), choose_nelem_alloc(), DEF_DIRSIZE, DEF_SEGSIZE, MAXALIGN, mul_size(), and next_pow2_long().

Referenced by BufTableShmemSize(), CreateSharedMemoryAndSemaphores(), LockShmemSize(), pgss_memsize(), and PredicateLockShmemSize().

746 {
747  Size size;
748  long nBuckets,
749  nSegments,
750  nDirEntries,
751  nElementAllocs,
752  elementSize,
753  elementAllocCnt;
754 
755  /* estimate number of buckets wanted */
756  nBuckets = next_pow2_long(num_entries);
757  /* # of segments needed for nBuckets */
758  nSegments = next_pow2_long((nBuckets - 1) / DEF_SEGSIZE + 1);
759  /* directory entries */
760  nDirEntries = DEF_DIRSIZE;
761  while (nDirEntries < nSegments)
762  nDirEntries <<= 1; /* dir_alloc doubles dsize at each call */
763 
764  /* fixed control info */
765  size = MAXALIGN(sizeof(HASHHDR)); /* but not HTAB, per above */
766  /* directory */
767  size = add_size(size, mul_size(nDirEntries, sizeof(HASHSEGMENT)));
768  /* segments */
769  size = add_size(size, mul_size(nSegments,
770  MAXALIGN(DEF_SEGSIZE * sizeof(HASHBUCKET))));
771  /* elements --- allocated in groups of choose_nelem_alloc() entries */
772  elementAllocCnt = choose_nelem_alloc(entrysize);
773  nElementAllocs = (num_entries - 1) / elementAllocCnt + 1;
774  elementSize = MAXALIGN(sizeof(HASHELEMENT)) + MAXALIGN(entrysize);
775  size = add_size(size,
776  mul_size(nElementAllocs,
777  mul_size(elementAllocCnt, elementSize)));
778 
779  return size;
780 }
static long next_pow2_long(long num)
Definition: dynahash.c:1748
Size mul_size(Size s1, Size s2)
Definition: shmem.c:515
Size add_size(Size s1, Size s2)
Definition: shmem.c:498
size_t Size
Definition: c.h:474
#define MAXALIGN(LEN)
Definition: c.h:699
static int choose_nelem_alloc(Size entrysize)
Definition: dynahash.c:618
#define DEF_SEGSIZE
Definition: dynahash.c:122
#define DEF_DIRSIZE
Definition: dynahash.c:124

◆ hash_freeze()

void hash_freeze ( HTAB hashp)

Definition at line 1497 of file dynahash.c.

References elog, ERROR, HTAB::frozen, has_seq_scans(), HTAB::isshared, and HTAB::tabname.

1498 {
1499  if (hashp->isshared)
1500  elog(ERROR, "cannot freeze shared hashtable \"%s\"", hashp->tabname);
1501  if (!hashp->frozen && has_seq_scans(hashp))
1502  elog(ERROR, "cannot freeze hashtable \"%s\" because it has active scans",
1503  hashp->tabname);
1504  hashp->frozen = true;
1505 }
#define ERROR
Definition: elog.h:43
static bool has_seq_scans(HTAB *hashp)
Definition: dynahash.c:1834
bool isshared
Definition: dynahash.c:228
bool frozen
Definition: dynahash.c:232
char * tabname
Definition: dynahash.c:227
#define elog(elevel,...)
Definition: elog.h:214

◆ hash_get_num_entries()

long hash_get_num_entries ( HTAB hashp)

Definition at line 1347 of file dynahash.c.

References HASHHDR::freeList, HTAB::hctl, i, IS_PARTITIONED, FreeListData::nentries, and NUM_FREELISTS.

Referenced by compute_array_stats(), compute_tsvector_stats(), entry_alloc(), entry_dealloc(), entry_reset(), EstimateEnumBlacklistSpace(), EstimatePendingSyncsSpace(), get_crosstab_tuplestore(), GetLockStatusData(), GetPredicateLockStatusData(), GetRunningTransactionLocks(), hash_stats(), pgss_shmem_shutdown(), pgstat_vacuum_stat(), ResetUnloggedRelationsInDbspaceDir(), SerializePendingSyncs(), transformGraph(), and XLogHaveInvalidPages().

1348 {
1349  int i;
1350  long sum = hashp->hctl->freeList[0].nentries;
1351 
1352  /*
1353  * We currently don't bother with acquiring the mutexes; it's only
1354  * sensible to call this function if you've got lock on all partitions of
1355  * the table.
1356  */
1357  if (IS_PARTITIONED(hashp->hctl))
1358  {
1359  for (i = 1; i < NUM_FREELISTS; i++)
1360  sum += hashp->hctl->freeList[i].nentries;
1361  }
1362 
1363  return sum;
1364 }
#define IS_PARTITIONED(hctl)
Definition: dynahash.c:209
#define NUM_FREELISTS
Definition: dynahash.c:127
HASHHDR * hctl
Definition: dynahash.c:220
long nentries
Definition: dynahash.c:155
FreeListData freeList[NUM_FREELISTS]
Definition: dynahash.c:179
int i

◆ hash_get_shared_size()

Size hash_get_shared_size ( HASHCTL info,
int  flags 
)

Definition at line 816 of file dynahash.c.

References Assert, HASHCTL::dsize, HASH_DIRSIZE, and HASHCTL::max_dsize.

Referenced by ShmemInitHash().

817 {
819  Assert(info->dsize == info->max_dsize);
820  return sizeof(HASHHDR) + info->dsize * sizeof(HASHSEGMENT);
821 }
long dsize
Definition: hsearch.h:69
long max_dsize
Definition: hsearch.h:70
struct HASHHDR HASHHDR
Definition: hsearch.h:58
#define Assert(condition)
Definition: c.h:746
#define HASH_DIRSIZE
Definition: hsearch.h:84

◆ hash_search()

void* hash_search ( HTAB hashp,
const void *  keyPtr,
HASHACTION  action,
bool foundPtr 
)

Definition at line 919 of file dynahash.c.

References generate_unaccent_rules::action, HTAB::hash, hash_search_with_hash_value(), and HTAB::keysize.

Referenced by _hash_finish_split(), _hash_splitbucket(), add_join_rel(), AddEnumLabel(), AddEventToPendingNotifies(), AddPendingSync(), apply_handle_stream_abort(), apply_handle_stream_commit(), ApplyLogicalMappingFile(), assign_record_type_typmod(), AsyncExistsPendingNotify(), AtEOSubXact_RelationCache(), AtEOXact_RelationCache(), build_join_rel_hash(), BuildEventTriggerCache(), CheckAndPromotePredicateLockRequest(), CheckForSerializableConflictOut(), CompactCheckpointerRequestQueue(), compile_plperl_function(), compile_pltcl_function(), compute_array_stats(), compute_tsvector_stats(), createNewConnection(), deleteConnection(), do_autovacuum(), DropAllPredicateLocksFromTable(), DropAllPreparedStatements(), DropPreparedStatement(), DropRelFileNodeAllLocalBuffers(), DropRelFileNodeLocalBuffers(), entry_alloc(), entry_dealloc(), entry_reset(), EnumBlacklisted(), EventCacheLookup(), ExecCleanupTupleRouting(), ExecFindPartition(), ExecHashSubPlanResultRelsByOid(), FetchPreparedStatement(), find_all_inheritors(), find_funcstat_entry(), find_join_rel(), find_oper_cache_entry(), find_rendezvous_variable(), find_tabstat_entry(), forget_invalid_pages(), forget_invalid_pages_db(), ForgetPrivateRefCountEntry(), get_attribute_options(), get_cast_hashentry(), get_pgstat_tabentry_relid(), get_rel_sync_entry(), get_tablespace(), get_tabstat_entry(), GetComboCommandId(), GetConnection(), getConnectionByName(), GetExtensibleNodeEntry(), GetPrivateRefCountEntry(), getState(), gistGetNodeBuffer(), gistGetParent(), gistMemorizeParent(), gistRelocateBuildBuffersOnSplit(), hash_object_field_end(), init_sequence(), InitPredicateLocks(), InvalidateAttoptCacheCallback(), InvalidateOprCacheCallBack(), InvalidateShippableCacheCallback(), InvalidateTableSpaceCacheCallback(), is_shippable(), JsObjectGetField(), LocalBufferAlloc(), LockAcquireExtended(), LockHasWaiters(), LockHeldByMe(), LockRelease(), log_invalid_page(), logical_rewrite_log_mapping(), logicalrep_partition_open(), logicalrep_rel_open(), logicalrep_relmap_update(), logicalrep_typmap_gettypname(), logicalrep_typmap_update(), lookup_C_func(), lookup_collation_cache(), lookup_proof_cache(), lookup_ts_config_cache(), lookup_ts_dictionary_cache(), lookup_ts_parser_cache(), lookup_type_cache(), LookupOpclassInfo(), make_oper_cache_entry(), PartitionDirectoryLookup(), pg_tzset(), pgss_store(), pgstat_collect_oids(), pgstat_fetch_stat_dbentry(), pgstat_fetch_stat_funcentry(), pgstat_fetch_stat_tabentry(), pgstat_get_db_entry(), pgstat_get_tab_entry(), pgstat_init_function_usage(), pgstat_read_db_statsfile(), pgstat_read_statsfiles(), pgstat_recv_dropdb(), pgstat_recv_funcpurge(), pgstat_recv_funcstat(), pgstat_recv_resetsinglecounter(), pgstat_recv_tabpurge(), pgstat_recv_tabstat(), pgstat_vacuum_stat(), plperl_spi_exec_prepared(), plperl_spi_freeplan(), plperl_spi_prepare(), plperl_spi_query_prepared(), plpgsql_HashTableDelete(), plpgsql_HashTableInsert(), plpgsql_HashTableLookup(), pltcl_fetch_interp(), PLy_generate_spi_exceptions(), PLy_procedure_get(), PLy_spi_subtransaction_abort(), populate_recordset_object_field_end(), predicatelock_twophase_recover(), PredicateLockExists(), PredicateLockTwoPhaseFinish(), PrefetchLocalBuffer(), process_syncing_tables_for_apply(), ProcessSyncRequests(), prune_element_hashtable(), prune_lexemes_hashtable(), rebuild_database_list(), record_C_func(), RegisterExtensibleNodeEntry(), RegisterPredicateLockingXid(), rel_sync_cache_relation_cb(), RelationPreTruncate(), ReleaseOneSerializableXact(), RelfilenodeMapInvalidateCallback(), RelFileNodeSkippingWAL(), RelidByRelfilenode(), RememberSyncRequest(), RemoveLocalLock(), ReorderBufferBuildTupleCidHash(), ReorderBufferCleanupTXN(), ReorderBufferToastAppendChunk(), ReorderBufferToastReplace(), ReorderBufferTXNByXid(), ReservePrivateRefCountEntry(), ResetUnloggedRelationsInDbspaceDir(), ResolveCminCmaxDuringDecoding(), RestoreEnumBlacklist(), rewrite_heap_dead_tuple(), rewrite_heap_tuple(), ri_FetchPreparedPlan(), ri_HashCompareOp(), ri_HashPreparedPlan(), ri_LoadConstraintInfo(), select_perl_context(), SerializePendingSyncs(), set_rtable_names(), ShmemInitStruct(), smgrclose(), smgrclosenode(), smgrDoPendingSyncs(), smgropen(), StandbyAcquireAccessExclusiveLock(), StandbyReleaseAllLocks(), StandbyReleaseLocks(), StandbyReleaseOldLocks(), StorePreparedStatement(), stream_cleanup_files(), stream_open_file(), subxact_info_read(), subxact_info_write(), and table_recheck_autovac().

923 {
924  return hash_search_with_hash_value(hashp,
925  keyPtr,
926  hashp->hash(keyPtr, hashp->keysize),
927  action,
928  foundPtr);
929 }
void * hash_search_with_hash_value(HTAB *hashp, const void *keyPtr, uint32 hashvalue, HASHACTION action, bool *foundPtr)
Definition: dynahash.c:932
Size keysize
Definition: dynahash.c:235
HashValueFunc hash
Definition: dynahash.c:222

◆ hash_search_with_hash_value()

void* hash_search_with_hash_value ( HTAB hashp,
const void *  keyPtr,
uint32  hashvalue,
HASHACTION  action,
bool foundPtr 
)

Definition at line 932 of file dynahash.c.

References HTAB::alloc, Assert, calc_bucket(), HTAB::dir, DynaHashAlloc(), ELEMENTKEY, elog, ereport, errcode(), errmsg(), ERROR, expand_table(), FreeListData::freeList, HASHHDR::freeList, FREELIST_IDX, HTAB::frozen, get_hash_entry(), has_seq_scans(), hash_corrupted(), HASH_ENTER, HASH_ENTER_NULL, HASH_FIND, HASH_REMOVE, HASHELEMENT::hashvalue, HTAB::hctl, IS_PARTITIONED, HTAB::isshared, HTAB::keycopy, HASHHDR::keysize, HTAB::keysize, HASHELEMENT::link, HTAB::match, HASHHDR::max_bucket, MOD, FreeListData::mutex, FreeListData::nentries, SpinLockAcquire, SpinLockRelease, HTAB::sshift, HTAB::ssize, and HTAB::tabname.

Referenced by BufTableDelete(), BufTableInsert(), BufTableLookup(), CheckTargetForConflictsIn(), CleanUpLock(), ClearOldPredicateLocks(), CreatePredicateLock(), DecrementParentLocks(), DeleteChildTargetLocks(), DeleteLockTarget(), DropAllPredicateLocksFromTable(), FastPathGetRelationLockEntry(), GetLockConflicts(), hash_search(), lock_twophase_recover(), LockAcquireExtended(), LockRefindAndRelease(), LockRelease(), LockWaiterCount(), PageIsPredicateLocked(), PredicateLockAcquire(), ReleaseOneSerializableXact(), RemoveScratchTarget(), RemoveTargetIfNoLongerUsed(), RestoreScratchTarget(), SetupLockInTable(), and TransferPredicateLocksToNewTarget().

937 {
938  HASHHDR *hctl = hashp->hctl;
939  int freelist_idx = FREELIST_IDX(hctl, hashvalue);
940  Size keysize;
941  uint32 bucket;
942  long segment_num;
943  long segment_ndx;
944  HASHSEGMENT segp;
945  HASHBUCKET currBucket;
946  HASHBUCKET *prevBucketPtr;
947  HashCompareFunc match;
948 
949 #ifdef HASH_STATISTICS
950  hash_accesses++;
951  hctl->accesses++;
952 #endif
953 
954  /*
955  * If inserting, check if it is time to split a bucket.
956  *
957  * NOTE: failure to expand table is not a fatal error, it just means we
958  * have to run at higher fill factor than we wanted. However, if we're
959  * using the palloc allocator then it will throw error anyway on
960  * out-of-memory, so we must do this before modifying the table.
961  */
963  {
964  /*
965  * Can't split if running in partitioned mode, nor if frozen, nor if
966  * table is the subject of any active hash_seq_search scans.
967  */
968  if (hctl->freeList[0].nentries > (long) hctl->max_bucket &&
969  !IS_PARTITIONED(hctl) && !hashp->frozen &&
970  !has_seq_scans(hashp))
971  (void) expand_table(hashp);
972  }
973 
974  /*
975  * Do the initial lookup
976  */
977  bucket = calc_bucket(hctl, hashvalue);
978 
979  segment_num = bucket >> hashp->sshift;
980  segment_ndx = MOD(bucket, hashp->ssize);
981 
982  segp = hashp->dir[segment_num];
983 
984  if (segp == NULL)
985  hash_corrupted(hashp);
986 
987  prevBucketPtr = &segp[segment_ndx];
988  currBucket = *prevBucketPtr;
989 
990  /*
991  * Follow collision chain looking for matching key
992  */
993  match = hashp->match; /* save one fetch in inner loop */
994  keysize = hashp->keysize; /* ditto */
995 
996  while (currBucket != NULL)
997  {
998  if (currBucket->hashvalue == hashvalue &&
999  match(ELEMENTKEY(currBucket), keyPtr, keysize) == 0)
1000  break;
1001  prevBucketPtr = &(currBucket->link);
1002  currBucket = *prevBucketPtr;
1003 #ifdef HASH_STATISTICS
1004  hash_collisions++;
1005  hctl->collisions++;
1006 #endif
1007  }
1008 
1009  if (foundPtr)
1010  *foundPtr = (bool) (currBucket != NULL);
1011 
1012  /*
1013  * OK, now what?
1014  */
1015  switch (action)
1016  {
1017  case HASH_FIND:
1018  if (currBucket != NULL)
1019  return (void *) ELEMENTKEY(currBucket);
1020  return NULL;
1021 
1022  case HASH_REMOVE:
1023  if (currBucket != NULL)
1024  {
1025  /* if partitioned, must lock to touch nentries and freeList */
1026  if (IS_PARTITIONED(hctl))
1027  SpinLockAcquire(&(hctl->freeList[freelist_idx].mutex));
1028 
1029  /* delete the record from the appropriate nentries counter. */
1030  Assert(hctl->freeList[freelist_idx].nentries > 0);
1031  hctl->freeList[freelist_idx].nentries--;
1032 
1033  /* remove record from hash bucket's chain. */
1034  *prevBucketPtr = currBucket->link;
1035 
1036  /* add the record to the appropriate freelist. */
1037  currBucket->link = hctl->freeList[freelist_idx].freeList;
1038  hctl->freeList[freelist_idx].freeList = currBucket;
1039 
1040  if (IS_PARTITIONED(hctl))
1041  SpinLockRelease(&hctl->freeList[freelist_idx].mutex);
1042 
1043  /*
1044  * better hope the caller is synchronizing access to this
1045  * element, because someone else is going to reuse it the next
1046  * time something is added to the table
1047  */
1048  return (void *) ELEMENTKEY(currBucket);
1049  }
1050  return NULL;
1051 
1052  case HASH_ENTER_NULL:
1053  /* ENTER_NULL does not work with palloc-based allocator */
1054  Assert(hashp->alloc != DynaHashAlloc);
1055  /* FALL THRU */
1056 
1057  case HASH_ENTER:
1058  /* Return existing element if found, else create one */
1059  if (currBucket != NULL)
1060  return (void *) ELEMENTKEY(currBucket);
1061 
1062  /* disallow inserts if frozen */
1063  if (hashp->frozen)
1064  elog(ERROR, "cannot insert into frozen hashtable \"%s\"",
1065  hashp->tabname);
1066 
1067  currBucket = get_hash_entry(hashp, freelist_idx);
1068  if (currBucket == NULL)
1069  {
1070  /* out of memory */
1071  if (action == HASH_ENTER_NULL)
1072  return NULL;
1073  /* report a generic message */
1074  if (hashp->isshared)
1075  ereport(ERROR,
1076  (errcode(ERRCODE_OUT_OF_MEMORY),
1077  errmsg("out of shared memory")));
1078  else
1079  ereport(ERROR,
1080  (errcode(ERRCODE_OUT_OF_MEMORY),
1081  errmsg("out of memory")));
1082  }
1083 
1084  /* link into hashbucket chain */
1085  *prevBucketPtr = currBucket;
1086  currBucket->link = NULL;
1087 
1088  /* copy key into record */
1089  currBucket->hashvalue = hashvalue;
1090  hashp->keycopy(ELEMENTKEY(currBucket), keyPtr, keysize);
1091 
1092  /*
1093  * Caller is expected to fill the data field on return. DO NOT
1094  * insert any code that could possibly throw error here, as doing
1095  * so would leave the table entry incomplete and hence corrupt the
1096  * caller's data structure.
1097  */
1098 
1099  return (void *) ELEMENTKEY(currBucket);
1100  }
1101 
1102  elog(ERROR, "unrecognized hash action code: %d", (int) action);
1103 
1104  return NULL; /* keep compiler quiet */
1105 }
int(* HashCompareFunc)(const void *key1, const void *key2, Size keysize)
Definition: hsearch.h:29
Size keysize
Definition: dynahash.c:235
uint32 max_bucket
Definition: dynahash.c:185
static uint32 calc_bucket(HASHHDR *hctl, uint32 hash_val)
Definition: dynahash.c:880
#define IS_PARTITIONED(hctl)
Definition: dynahash.c:209
#define ELEMENTKEY(helem)
Definition: dynahash.c:243
int errcode(int sqlerrcode)
Definition: elog.c:610
HashAllocFunc alloc
Definition: dynahash.c:225
slock_t mutex
Definition: dynahash.c:154
static HASHBUCKET get_hash_entry(HTAB *hashp, int freelist_idx)
Definition: dynahash.c:1262
#define SpinLockAcquire(lock)
Definition: spin.h:62
long ssize
Definition: dynahash.c:236
#define ERROR
Definition: elog.h:43
int sshift
Definition: dynahash.c:237
#define MOD(x, y)
Definition: dynahash.c:254
HASHHDR * hctl
Definition: dynahash.c:220
static void hash_corrupted(HTAB *hashp)
Definition: dynahash.c:1716
static bool has_seq_scans(HTAB *hashp)
Definition: dynahash.c:1834
unsigned int uint32
Definition: c.h:375
long nentries
Definition: dynahash.c:155
HashCompareFunc match
Definition: dynahash.c:223
bool isshared
Definition: dynahash.c:228
#define SpinLockRelease(lock)
Definition: spin.h:64
bool frozen
Definition: dynahash.c:232
FreeListData freeList[NUM_FREELISTS]
Definition: dynahash.c:179
#define ereport(elevel,...)
Definition: elog.h:144
HashCopyFunc keycopy
Definition: dynahash.c:224
#define Assert(condition)
Definition: c.h:746
size_t Size
Definition: c.h:474
static bool expand_table(HTAB *hashp)
Definition: dynahash.c:1514
char * tabname
Definition: dynahash.c:227
static void * DynaHashAlloc(Size size)
Definition: dynahash.c:288
int errmsg(const char *fmt,...)
Definition: elog.c:821
struct HASHELEMENT * link
Definition: hsearch.h:53
#define elog(elevel,...)
Definition: elog.h:214
HASHELEMENT * freeList
Definition: dynahash.c:156
HASHSEGMENT * dir
Definition: dynahash.c:221
#define FREELIST_IDX(hctl, hashcode)
Definition: dynahash.c:211
uint32 hashvalue
Definition: hsearch.h:54
unsigned char bool
Definition: c.h:325

◆ hash_select_dirsize()

long hash_select_dirsize ( long  num_entries)

Definition at line 792 of file dynahash.c.

References DEF_DIRSIZE, DEF_SEGSIZE, and next_pow2_long().

Referenced by ShmemInitHash().

793 {
794  long nBuckets,
795  nSegments,
796  nDirEntries;
797 
798  /* estimate number of buckets wanted */
799  nBuckets = next_pow2_long(num_entries);
800  /* # of segments needed for nBuckets */
801  nSegments = next_pow2_long((nBuckets - 1) / DEF_SEGSIZE + 1);
802  /* directory entries */
803  nDirEntries = DEF_DIRSIZE;
804  while (nDirEntries < nSegments)
805  nDirEntries <<= 1; /* dir_alloc doubles dsize at each call */
806 
807  return nDirEntries;
808 }
static long next_pow2_long(long num)
Definition: dynahash.c:1748
#define DEF_SEGSIZE
Definition: dynahash.c:122
#define DEF_DIRSIZE
Definition: dynahash.c:124

◆ hash_seq_init()

void hash_seq_init ( HASH_SEQ_STATUS status,
HTAB hashp 
)

Definition at line 1391 of file dynahash.c.

References HASH_SEQ_STATUS::curBucket, HASH_SEQ_STATUS::curEntry, HTAB::frozen, HASH_SEQ_STATUS::hashp, and register_seq_scan().

Referenced by AtAbort_Portals(), AtCleanup_Portals(), AtEOSubXact_RelationCache(), AtEOXact_RelationCache(), AtPrepare_Locks(), AtSubAbort_Portals(), AtSubCleanup_Portals(), AtSubCommit_Portals(), CheckForBufferLeaks(), CheckTableForSerializableConflictIn(), cleanup_rel_sync_cache(), compute_array_stats(), compute_tsvector_stats(), dblink_get_connections(), DestroyPartitionDirectory(), DropAllPredicateLocksFromTable(), DropAllPreparedStatements(), end_heap_rewrite(), entry_dealloc(), entry_reset(), forget_invalid_pages(), forget_invalid_pages_db(), gc_qtexts(), GetLockmodeName(), GetLockStatusData(), GetPredicateLockStatusData(), GetRunningTransactionLocks(), HoldPinnedPortals(), InvalidateAttoptCacheCallback(), InvalidateOprCacheCallBack(), InvalidateOprProofCacheCallBack(), InvalidateShippableCacheCallback(), InvalidateTableSpaceCacheCallback(), InvalidateTSCacheCallBack(), LockReassignCurrentOwner(), LockReleaseAll(), LockReleaseCurrentOwner(), LockReleaseSession(), logical_end_heap_rewrite(), logical_heap_rewrite_flush_mappings(), logicalrep_partmap_invalidate_cb(), logicalrep_relmap_invalidate_cb(), packArcInfoCmp(), packGraph(), pg_cursor(), pg_get_shmem_allocations(), pg_prepared_statement(), pg_stat_statements_internal(), pgfdw_inval_callback(), pgfdw_subxact_callback(), pgfdw_xact_callback(), pgss_shmem_shutdown(), pgstat_send_funcstats(), pgstat_vacuum_stat(), pgstat_write_db_statsfile(), pgstat_write_statsfiles(), plperl_fini(), PortalErrorCleanup(), PortalHashTableDeleteAll(), PostPrepare_Locks(), PreCommit_Portals(), ProcessSyncRequests(), prune_element_hashtable(), prune_lexemes_hashtable(), rebuild_database_list(), rel_sync_cache_publication_cb(), RelationCacheInitializePhase3(), RelationCacheInvalidate(), RelfilenodeMapInvalidateCallback(), RememberSyncRequest(), RememberToFreeTupleDescAtEOX(), ReorderBufferLargestTXN(), ReorderBufferToastReset(), selectColorTrigrams(), SerializeEnumBlacklist(), SerializePendingSyncs(), smgrcloseall(), smgrDoPendingSyncs(), StandbyReleaseAllLocks(), StandbyReleaseOldLocks(), ThereAreNoReadyPortals(), TypeCacheOpcCallback(), TypeCacheRelCallback(), TypeCacheTypCallback(), write_relcache_init_file(), and XLogCheckInvalidPages().

1392 {
1393  status->hashp = hashp;
1394  status->curBucket = 0;
1395  status->curEntry = NULL;
1396  if (!hashp->frozen)
1397  register_seq_scan(hashp);
1398 }
uint32 curBucket
Definition: hsearch.h:113
HASHELEMENT * curEntry
Definition: hsearch.h:114
HTAB * hashp
Definition: hsearch.h:112
bool frozen
Definition: dynahash.c:232
static void register_seq_scan(HTAB *hashp)
Definition: dynahash.c:1801

◆ hash_seq_search()

void* hash_seq_search ( HASH_SEQ_STATUS status)

Definition at line 1401 of file dynahash.c.

References HASH_SEQ_STATUS::curBucket, HASH_SEQ_STATUS::curEntry, HTAB::dir, ELEMENTKEY, hash_seq_term(), HASH_SEQ_STATUS::hashp, HTAB::hctl, HASHELEMENT::link, HASHHDR::max_bucket, MOD, HTAB::sshift, HASHHDR::ssize, and HTAB::ssize.

Referenced by AtAbort_Portals(), AtCleanup_Portals(), AtEOSubXact_RelationCache(), AtEOXact_RelationCache(), AtPrepare_Locks(), AtSubAbort_Portals(), AtSubCleanup_Portals(), AtSubCommit_Portals(), CheckForBufferLeaks(), CheckTableForSerializableConflictIn(), cleanup_rel_sync_cache(), compute_array_stats(), compute_tsvector_stats(), dblink_get_connections(), DestroyPartitionDirectory(), DropAllPredicateLocksFromTable(), DropAllPreparedStatements(), end_heap_rewrite(), entry_dealloc(), entry_reset(), forget_invalid_pages(), forget_invalid_pages_db(), gc_qtexts(), GetLockmodeName(), GetLockStatusData(), GetPredicateLockStatusData(), GetRunningTransactionLocks(), HoldPinnedPortals(), InvalidateAttoptCacheCallback(), InvalidateOprCacheCallBack(), InvalidateOprProofCacheCallBack(), InvalidateShippableCacheCallback(), InvalidateTableSpaceCacheCallback(), InvalidateTSCacheCallBack(), LockReassignCurrentOwner(), LockReleaseAll(), LockReleaseCurrentOwner(), LockReleaseSession(), logical_end_heap_rewrite(), logical_heap_rewrite_flush_mappings(), logicalrep_partmap_invalidate_cb(), logicalrep_relmap_invalidate_cb(), packArcInfoCmp(), packGraph(), pg_cursor(), pg_get_shmem_allocations(), pg_prepared_statement(), pg_stat_statements_internal(), pgfdw_inval_callback(), pgfdw_subxact_callback(), pgfdw_xact_callback(), pgss_shmem_shutdown(), pgstat_send_funcstats(), pgstat_vacuum_stat(), pgstat_write_db_statsfile(), pgstat_write_statsfiles(), plperl_fini(), PortalErrorCleanup(), PortalHashTableDeleteAll(), PostPrepare_Locks(), PreCommit_Portals(), ProcessSyncRequests(), prune_element_hashtable(), prune_lexemes_hashtable(), rebuild_database_list(), rel_sync_cache_publication_cb(), RelationCacheInitializePhase3(), RelationCacheInvalidate(), RelfilenodeMapInvalidateCallback(), RememberSyncRequest(), RememberToFreeTupleDescAtEOX(), ReorderBufferLargestTXN(), ReorderBufferToastReset(), selectColorTrigrams(), SerializeEnumBlacklist(), SerializePendingSyncs(), smgrcloseall(), smgrDoPendingSyncs(), StandbyReleaseAllLocks(), StandbyReleaseOldLocks(), ThereAreNoReadyPortals(), TypeCacheOpcCallback(), TypeCacheRelCallback(), TypeCacheTypCallback(), write_relcache_init_file(), and XLogCheckInvalidPages().

1402 {
1403  HTAB *hashp;
1404  HASHHDR *hctl;
1405  uint32 max_bucket;
1406  long ssize;
1407  long segment_num;
1408  long segment_ndx;
1409  HASHSEGMENT segp;
1410  uint32 curBucket;
1411  HASHELEMENT *curElem;
1412 
1413  if ((curElem = status->curEntry) != NULL)
1414  {
1415  /* Continuing scan of curBucket... */
1416  status->curEntry = curElem->link;
1417  if (status->curEntry == NULL) /* end of this bucket */
1418  ++status->curBucket;
1419  return (void *) ELEMENTKEY(curElem);
1420  }
1421 
1422  /*
1423  * Search for next nonempty bucket starting at curBucket.
1424  */
1425  curBucket = status->curBucket;
1426  hashp = status->hashp;
1427  hctl = hashp->hctl;
1428  ssize = hashp->ssize;
1429  max_bucket = hctl->max_bucket;
1430 
1431  if (curBucket > max_bucket)
1432  {
1433  hash_seq_term(status);
1434  return NULL; /* search is done */
1435  }
1436 
1437  /*
1438  * first find the right segment in the table directory.
1439  */
1440  segment_num = curBucket >> hashp->sshift;
1441  segment_ndx = MOD(curBucket, ssize);
1442 
1443  segp = hashp->dir[segment_num];
1444 
1445  /*
1446  * Pick up the first item in this bucket's chain. If chain is not empty
1447  * we can begin searching it. Otherwise we have to advance to find the
1448  * next nonempty bucket. We try to optimize that case since searching a
1449  * near-empty hashtable has to iterate this loop a lot.
1450  */
1451  while ((curElem = segp[segment_ndx]) == NULL)
1452  {
1453  /* empty bucket, advance to next */
1454  if (++curBucket > max_bucket)
1455  {
1456  status->curBucket = curBucket;
1457  hash_seq_term(status);
1458  return NULL; /* search is done */
1459  }
1460  if (++segment_ndx >= ssize)
1461  {
1462  segment_num++;
1463  segment_ndx = 0;
1464  segp = hashp->dir[segment_num];
1465  }
1466  }
1467 
1468  /* Begin scan of curBucket... */
1469  status->curEntry = curElem->link;
1470  if (status->curEntry == NULL) /* end of this bucket */
1471  ++curBucket;
1472  status->curBucket = curBucket;
1473  return (void *) ELEMENTKEY(curElem);
1474 }
uint32 curBucket
Definition: hsearch.h:113
uint32 max_bucket
Definition: dynahash.c:185
#define ELEMENTKEY(helem)
Definition: dynahash.c:243
HASHELEMENT * curEntry
Definition: hsearch.h:114
Definition: dynahash.c:218
long ssize
Definition: dynahash.c:236
int sshift
Definition: dynahash.c:237
#define MOD(x, y)
Definition: dynahash.c:254
HASHHDR * hctl
Definition: dynahash.c:220
unsigned int uint32
Definition: c.h:375
HTAB * hashp
Definition: hsearch.h:112
struct HASHELEMENT * link
Definition: hsearch.h:53
HASHSEGMENT * dir
Definition: dynahash.c:221
void hash_seq_term(HASH_SEQ_STATUS *status)
Definition: dynahash.c:1477

◆ hash_seq_term()

void hash_seq_term ( HASH_SEQ_STATUS status)

◆ hash_stats()

void hash_stats ( const char *  where,
HTAB hashp 
)

Definition at line 846 of file dynahash.c.

References fprintf, hash_get_num_entries(), HTAB::hctl, HASHHDR::keysize, HASHHDR::max_bucket, and HASHHDR::nsegs.

Referenced by hash_destroy().

847 {
848 #ifdef HASH_STATISTICS
849  fprintf(stderr, "%s: this HTAB -- accesses %ld collisions %ld\n",
850  where, hashp->hctl->accesses, hashp->hctl->collisions);
851 
852  fprintf(stderr, "hash_stats: entries %ld keysize %ld maxp %u segmentcount %ld\n",
853  hash_get_num_entries(hashp), (long) hashp->hctl->keysize,
854  hashp->hctl->max_bucket, hashp->hctl->nsegs);
855  fprintf(stderr, "%s: total accesses %ld total collisions %ld\n",
856  where, hash_accesses, hash_collisions);
857  fprintf(stderr, "hash_stats: total expansions %ld\n",
858  hash_expansions);
859 #endif
860 }
Size keysize
Definition: dynahash.c:190
uint32 max_bucket
Definition: dynahash.c:185
long hash_get_num_entries(HTAB *hashp)
Definition: dynahash.c:1347
#define fprintf
Definition: port.h:219
HASHHDR * hctl
Definition: dynahash.c:220
long nsegs
Definition: dynahash.c:184

◆ hash_update_hash_key()

bool hash_update_hash_key ( HTAB hashp,
void *  existingEntry,
const void *  newKeyPtr 
)

Definition at line 1127 of file dynahash.c.

References calc_bucket(), HTAB::dir, ELEMENT_FROM_KEY, ELEMENTKEY, elog, ERROR, HTAB::frozen, HTAB::hash, hash_corrupted(), HASHELEMENT::hashvalue, HTAB::hctl, HTAB::keycopy, HASHHDR::keysize, HTAB::keysize, HASHELEMENT::link, HTAB::match, MOD, HTAB::sshift, HTAB::ssize, and HTAB::tabname.

Referenced by PostPrepare_Locks().

1130 {
1131  HASHELEMENT *existingElement = ELEMENT_FROM_KEY(existingEntry);
1132  HASHHDR *hctl = hashp->hctl;
1133  uint32 newhashvalue;
1134  Size keysize;
1135  uint32 bucket;
1136  uint32 newbucket;
1137  long segment_num;
1138  long segment_ndx;
1139  HASHSEGMENT segp;
1140  HASHBUCKET currBucket;
1141  HASHBUCKET *prevBucketPtr;
1142  HASHBUCKET *oldPrevPtr;
1143  HashCompareFunc match;
1144 
1145 #ifdef HASH_STATISTICS
1146  hash_accesses++;
1147  hctl->accesses++;
1148 #endif
1149 
1150  /* disallow updates if frozen */
1151  if (hashp->frozen)
1152  elog(ERROR, "cannot update in frozen hashtable \"%s\"",
1153  hashp->tabname);
1154 
1155  /*
1156  * Lookup the existing element using its saved hash value. We need to do
1157  * this to be able to unlink it from its hash chain, but as a side benefit
1158  * we can verify the validity of the passed existingEntry pointer.
1159  */
1160  bucket = calc_bucket(hctl, existingElement->hashvalue);
1161 
1162  segment_num = bucket >> hashp->sshift;
1163  segment_ndx = MOD(bucket, hashp->ssize);
1164 
1165  segp = hashp->dir[segment_num];
1166 
1167  if (segp == NULL)
1168  hash_corrupted(hashp);
1169 
1170  prevBucketPtr = &segp[segment_ndx];
1171  currBucket = *prevBucketPtr;
1172 
1173  while (currBucket != NULL)
1174  {
1175  if (currBucket == existingElement)
1176  break;
1177  prevBucketPtr = &(currBucket->link);
1178  currBucket = *prevBucketPtr;
1179  }
1180 
1181  if (currBucket == NULL)
1182  elog(ERROR, "hash_update_hash_key argument is not in hashtable \"%s\"",
1183  hashp->tabname);
1184 
1185  oldPrevPtr = prevBucketPtr;
1186 
1187  /*
1188  * Now perform the equivalent of a HASH_ENTER operation to locate the hash
1189  * chain we want to put the entry into.
1190  */
1191  newhashvalue = hashp->hash(newKeyPtr, hashp->keysize);
1192 
1193  newbucket = calc_bucket(hctl, newhashvalue);
1194 
1195  segment_num = newbucket >> hashp->sshift;
1196  segment_ndx = MOD(newbucket, hashp->ssize);
1197 
1198  segp = hashp->dir[segment_num];
1199 
1200  if (segp == NULL)
1201  hash_corrupted(hashp);
1202 
1203  prevBucketPtr = &segp[segment_ndx];
1204  currBucket = *prevBucketPtr;
1205 
1206  /*
1207  * Follow collision chain looking for matching key
1208  */
1209  match = hashp->match; /* save one fetch in inner loop */
1210  keysize = hashp->keysize; /* ditto */
1211 
1212  while (currBucket != NULL)
1213  {
1214  if (currBucket->hashvalue == newhashvalue &&
1215  match(ELEMENTKEY(currBucket), newKeyPtr, keysize) == 0)
1216  break;
1217  prevBucketPtr = &(currBucket->link);
1218  currBucket = *prevBucketPtr;
1219 #ifdef HASH_STATISTICS
1220  hash_collisions++;
1221  hctl->collisions++;
1222 #endif
1223  }
1224 
1225  if (currBucket != NULL)
1226  return false; /* collision with an existing entry */
1227 
1228  currBucket = existingElement;
1229 
1230  /*
1231  * If old and new hash values belong to the same bucket, we need not
1232  * change any chain links, and indeed should not since this simplistic
1233  * update will corrupt the list if currBucket is the last element. (We
1234  * cannot fall out earlier, however, since we need to scan the bucket to
1235  * check for duplicate keys.)
1236  */
1237  if (bucket != newbucket)
1238  {
1239  /* OK to remove record from old hash bucket's chain. */
1240  *oldPrevPtr = currBucket->link;
1241 
1242  /* link into new hashbucket chain */
1243  *prevBucketPtr = currBucket;
1244  currBucket->link = NULL;
1245  }
1246 
1247  /* copy new key into record */
1248  currBucket->hashvalue = newhashvalue;
1249  hashp->keycopy(ELEMENTKEY(currBucket), newKeyPtr, keysize);
1250 
1251  /* rest of record is untouched */
1252 
1253  return true;
1254 }
int(* HashCompareFunc)(const void *key1, const void *key2, Size keysize)
Definition: hsearch.h:29
Size keysize
Definition: dynahash.c:235
static uint32 calc_bucket(HASHHDR *hctl, uint32 hash_val)
Definition: dynahash.c:880
#define ELEMENTKEY(helem)
Definition: dynahash.c:243
#define ELEMENT_FROM_KEY(key)
Definition: dynahash.c:248
HashValueFunc hash
Definition: dynahash.c:222
long ssize
Definition: dynahash.c:236
#define ERROR
Definition: elog.h:43
int sshift
Definition: dynahash.c:237
#define MOD(x, y)
Definition: dynahash.c:254
HASHHDR * hctl
Definition: dynahash.c:220
static void hash_corrupted(HTAB *hashp)
Definition: dynahash.c:1716
unsigned int uint32
Definition: c.h:375
HashCompareFunc match
Definition: dynahash.c:223
bool frozen
Definition: dynahash.c:232
HashCopyFunc keycopy
Definition: dynahash.c:224
size_t Size
Definition: c.h:474
char * tabname
Definition: dynahash.c:227
struct HASHELEMENT * link
Definition: hsearch.h:53
#define elog(elevel,...)
Definition: elog.h:214
HASHSEGMENT * dir
Definition: dynahash.c:221
uint32 hashvalue
Definition: hsearch.h:54