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Name	Size	Permission
acl.h	12.79 KB	-rw-r--r--
array.h	10.97 KB	-rw-r--r--
ascii.h	579 B	-rw-r--r--
attoptcache.h	725 B	-rw-r--r--
builtins.h	47.77 KB	-rw-r--r--
bytea.h	1.58 KB	-rw-r--r--
cash.h	2.07 KB	-rw-r--r--
catcache.h	7.51 KB	-rw-r--r--
combocid.h	698 B	-rw-r--r--
date.h	7.73 KB	-rw-r--r--
datetime.h	9.92 KB	-rw-r--r--
datum.h	1.48 KB	-rw-r--r--
dynahash.h	498 B	-rw-r--r--
dynamic_loader.h	648 B	-rw-r--r--
elog.h	12.56 KB	-rw-r--r--
errcodes.h	19.61 KB	-rw-r--r--
fmgroids.h	61.09 KB	-rw-r--r--
fmgrtab.h	1.15 KB	-rw-r--r--
formatting.h	1.41 KB	-rw-r--r--
geo_decls.h	15.86 KB	-rw-r--r--
guc.h	13.19 KB	-rw-r--r--
guc_tables.h	7.15 KB	-rw-r--r--
help_config.h	432 B	-rw-r--r--
hsearch.h	5.51 KB	-rw-r--r--
inet.h	2.66 KB	-rw-r--r--
int8.h	4.03 KB	-rw-r--r--
inval.h	1.81 KB	-rw-r--r--
json.h	916 B	-rw-r--r--
logtape.h	1.5 KB	-rw-r--r--
lsyscache.h	6.51 KB	-rw-r--r--
memutils.h	5.2 KB	-rw-r--r--
nabstime.h	5.79 KB	-rw-r--r--
numeric.h	1.88 KB	-rw-r--r--
palloc.h	3.92 KB	-rw-r--r--
pg_crc.h	4.36 KB	-rw-r--r--
pg_crc_tables.h	19.73 KB	-rw-r--r--
pg_locale.h	2.59 KB	-rw-r--r--
pg_lzcompress.h	2.97 KB	-rw-r--r--
pg_rusage.h	847 B	-rw-r--r--
plancache.h	8.02 KB	-rw-r--r--
portal.h	9.22 KB	-rw-r--r--
probes.h	37.93 KB	-rw-r--r--
ps_status.h	668 B	-rw-r--r--
rangetypes.h	7.4 KB	-rw-r--r--
rbtree.h	2.26 KB	-rw-r--r--
rel.h	12.27 KB	-rw-r--r--
relcache.h	3.17 KB	-rw-r--r--
relmapper.h	1.68 KB	-rw-r--r--
reltrigger.h	1.95 KB	-rw-r--r--
resowner.h	5.07 KB	-rw-r--r--
selfuncs.h	7.5 KB	-rw-r--r--
snapmgr.h	1.59 KB	-rw-r--r--
snapshot.h	2.59 KB	-rw-r--r--
sortsupport.h	5.3 KB	-rw-r--r--
spccache.h	556 B	-rw-r--r--
syscache.h	5.51 KB	-rw-r--r--
timestamp.h	9.5 KB	-rw-r--r--
tqual.h	3.5 KB	-rw-r--r--
tuplesort.h	4.62 KB	-rw-r--r--
tuplestore.h	3.14 KB	-rw-r--r--
typcache.h	4.26 KB	-rw-r--r--
tzparser.h	1.13 KB	-rw-r--r--
uuid.h	861 B	-rw-r--r--
varbit.h	4.27 KB	-rw-r--r--
xml.h	3.89 KB	-rw-r--r--

Code Editor : hsearch.h

/*-------------------------------------------------------------------------
 *
 * hsearch.h
 *	  exported definitions for utils/hash/dynahash.c; see notes therein
 *
 *
 * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/utils/hsearch.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef HSEARCH_H
#define HSEARCH_H

/*
 * Hash functions must have this signature.
 */
typedef uint32 (*HashValueFunc) (const void *key, Size keysize);

/*
 * Key comparison functions must have this signature.  Comparison functions
 * return zero for match, nonzero for no match.  (The comparison function
 * definition is designed to allow memcmp() and strncmp() to be used directly
 * as key comparison functions.)
 */
typedef int (*HashCompareFunc) (const void *key1, const void *key2,
											Size keysize);

/*
 * Key copying functions must have this signature.  The return value is not
 * used.  (The definition is set up to allow memcpy() and strncpy() to be
 * used directly.)
 */
typedef void *(*HashCopyFunc) (void *dest, const void *src, Size keysize);

/*
 * Space allocation function for a hashtable --- designed to match malloc().
 * Note: there is no free function API; can't destroy a hashtable unless you
 * use the default allocator.
 */
typedef void *(*HashAllocFunc) (Size request);

/*
 * HASHELEMENT is the private part of a hashtable entry.  The caller's data
 * follows the HASHELEMENT structure (on a MAXALIGN'd boundary).  The hash key
 * is expected to be at the start of the caller's hash entry data structure.
 */
typedef struct HASHELEMENT
{
	struct HASHELEMENT *link;	/* link to next entry in same bucket */
	uint32		hashvalue;		/* hash function result for this entry */
} HASHELEMENT;

/* Hash table header struct is an opaque type known only within dynahash.c */
typedef struct HASHHDR HASHHDR;

/* Hash table control struct is an opaque type known only within dynahash.c */
typedef struct HTAB HTAB;

/* Parameter data structure for hash_create */
/* Only those fields indicated by hash_flags need be set */
typedef struct HASHCTL
{
	long		num_partitions; /* # partitions (must be power of 2) */
	long		ssize;			/* segment size */
	long		dsize;			/* (initial) directory size */
	long		max_dsize;		/* limit to dsize if dir size is limited */
	long		ffactor;		/* fill factor */
	Size		keysize;		/* hash key length in bytes */
	Size		entrysize;		/* total user element size in bytes */
	HashValueFunc hash;			/* hash function */
	HashCompareFunc match;		/* key comparison function */
	HashCopyFunc keycopy;		/* key copying function */
	HashAllocFunc alloc;		/* memory allocator */
	MemoryContext hcxt;			/* memory context to use for allocations */
	HASHHDR    *hctl;			/* location of header in shared mem */
} HASHCTL;

/* Flags to indicate which parameters are supplied */
#define HASH_PARTITION	0x001	/* Hashtable is used w/partitioned locking */
#define HASH_SEGMENT	0x002	/* Set segment size */
#define HASH_DIRSIZE	0x004	/* Set directory size (initial and max) */
#define HASH_FFACTOR	0x008	/* Set fill factor */
#define HASH_FUNCTION	0x010	/* Set user defined hash function */
#define HASH_ELEM		0x020	/* Set keysize and entrysize */
#define HASH_SHARED_MEM 0x040	/* Hashtable is in shared memory */
#define HASH_ATTACH		0x080	/* Do not initialize hctl */
#define HASH_ALLOC		0x100	/* Set memory allocator */
#define HASH_CONTEXT	0x200	/* Set memory allocation context */
#define HASH_COMPARE	0x400	/* Set user defined comparison function */
#define HASH_KEYCOPY	0x800	/* Set user defined key-copying function */
#define HASH_FIXED_SIZE 0x1000	/* Initial size is a hard limit */

/* max_dsize value to indicate expansible directory */
#define NO_MAX_DSIZE			(-1)

/* hash_search operations */
typedef enum
{
	HASH_FIND,
	HASH_ENTER,
	HASH_REMOVE,
	HASH_ENTER_NULL
} HASHACTION;

/* hash_seq status (should be considered an opaque type by callers) */
typedef struct
{
	HTAB	   *hashp;
	uint32		curBucket;		/* index of current bucket */
	HASHELEMENT *curEntry;		/* current entry in bucket */
} HASH_SEQ_STATUS;

/*
 * prototypes for functions in dynahash.c
 */
extern HTAB *hash_create(const char *tabname, long nelem,
			HASHCTL *info, int flags);
extern void hash_destroy(HTAB *hashp);
extern void hash_stats(const char *where, HTAB *hashp);
extern void *hash_search(HTAB *hashp, const void *keyPtr, HASHACTION action,
			bool *foundPtr);
extern uint32 get_hash_value(HTAB *hashp, const void *keyPtr);
extern void *hash_search_with_hash_value(HTAB *hashp, const void *keyPtr,
							uint32 hashvalue, HASHACTION action,
							bool *foundPtr);
extern long hash_get_num_entries(HTAB *hashp);
extern void hash_seq_init(HASH_SEQ_STATUS *status, HTAB *hashp);
extern void *hash_seq_search(HASH_SEQ_STATUS *status);
extern void hash_seq_term(HASH_SEQ_STATUS *status);
extern void hash_freeze(HTAB *hashp);
extern Size hash_estimate_size(long num_entries, Size entrysize);
extern long hash_select_dirsize(long num_entries);
extern Size hash_get_shared_size(HASHCTL *info, int flags);
extern void AtEOXact_HashTables(bool isCommit);
extern void AtEOSubXact_HashTables(bool isCommit, int nestDepth);

/*
 * prototypes for functions in hashfn.c
 */
extern uint32 string_hash(const void *key, Size keysize);
extern uint32 tag_hash(const void *key, Size keysize);
extern uint32 oid_hash(const void *key, Size keysize);
extern uint32 bitmap_hash(const void *key, Size keysize);
extern int	bitmap_match(const void *key1, const void *key2, Size keysize);

#endif   /* HSEARCH_H */

${this.title}

Code Editor : hsearch.h