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1b8a219eef
starting a new hashtable search no longer clobbers any other search active anywhere in the system. Fix RelationCacheInvalidate() so that it will not crash or go into an infinite loop if invoked recursively, as for example by a second SI Reset message arriving while we are still processing a prior one.
59 lines
1.7 KiB
C
59 lines
1.7 KiB
C
/*-------------------------------------------------------------------------
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*
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* hasht.c
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* hash table related functions that are not directly supported
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* by the hashing packages under utils/hash.
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*
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* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/lib/Attic/hasht.c,v 1.14 2001/01/02 04:33:15 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "lib/hasht.h"
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#include "utils/memutils.h"
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/* -----------------------------------
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* HashTableWalk
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*
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* call given function on every element in hashtable
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*
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* one extra argument (arg) may be supplied
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*
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* NOTE: it is allowed for the given function to delete the hashtable entry
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* it is passed. However, deleting any other element while the scan is
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* in progress is UNDEFINED (see hash_seq functions). Also, if elements are
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* added to the table while the scan is in progress, it is unspecified
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* whether they will be visited by the scan or not.
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* -----------------------------------
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*/
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void
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HashTableWalk(HTAB *hashtable, HashtFunc function, Datum arg)
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{
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HASH_SEQ_STATUS status;
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long *hashent;
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void *data;
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int keysize;
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hash_seq_init(&status, hashtable);
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keysize = hashtable->hctl->keysize;
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while ((hashent = hash_seq_search(&status)) != (long *) TRUE)
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{
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if (hashent == NULL)
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elog(FATAL, "error in HashTableWalk");
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/*
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* XXX the corresponding hash table insertion does NOT LONGALIGN
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* -- make sure the keysize is ok
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*/
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data = (void *) LONGALIGN((char *) hashent + keysize);
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(*function) (data, arg);
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}
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}
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