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/*-------------------------------------------------------------------------
*
* hasht.c
* hash table related functions that are not directly supported
* by the hashing packages under utils/hash.
*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/lib/Attic/hasht.c,v 1.15 2001/01/24 19:42:55 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "lib/hasht.h"
#include "utils/memutils.h"
/* -----------------------------------
* HashTableWalk
*
* call given function on every element in hashtable
*
* one extra argument (arg) may be supplied
*
* NOTE: it is allowed for the given function to delete the hashtable entry
* it is passed. However, deleting any other element while the scan is
* in progress is UNDEFINED (see hash_seq functions). Also, if elements are
* added to the table while the scan is in progress, it is unspecified
* whether they will be visited by the scan or not.
* -----------------------------------
*/
void
HashTableWalk(HTAB *hashtable, HashtFunc function, Datum arg)
{
HASH_SEQ_STATUS status;
long *hashent;
void *data;
int keysize;
hash_seq_init(&status, hashtable);
keysize = hashtable->hctl->keysize;
while ((hashent = hash_seq_search(&status)) != (long *) TRUE)
{
if (hashent == NULL)
elog(FATAL, "error in HashTableWalk");
/*
* XXX the corresponding hash table insertion does NOT LONGALIGN
* -- make sure the keysize is ok
*/
data = (void *) LONGALIGN((char *) hashent + keysize);
(*function) (data, arg);
}
}
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