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ht_flush.c

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00001 /*
00002 ** Copyright (C) 2002 by Kevin L. Mitchell <klmitch@mit.edu>
00003 **
00004 ** This library is free software; you can redistribute it and/or
00005 ** modify it under the terms of the GNU Library General Public
00006 ** License as published by the Free Software Foundation; either
00007 ** version 2 of the License, or (at your option) any later version.
00008 **
00009 ** This library is distributed in the hope that it will be useful,
00010 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
00011 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012 ** Library General Public License for more details.
00013 **
00014 ** You should have received a copy of the GNU Library General Public
00015 ** License along with this library; if not, write to the Free
00016 ** Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
00017 ** MA 02111-1307, USA
00018 **
00019 ** @(#)$Id: ht_flush.c,v 1.3 2006/07/13 05:36:16 klmitch Exp $
00020 */
00028 #include <stdlib.h>
00029 
00030 #include "dbprim.h"
00031 #include "dbprim_int.h"
00032 
00033 RCSTAG("@(#)$Id: ht_flush.c,v 1.3 2006/07/13 05:36:16 klmitch Exp $");
00034 
00035 unsigned long
00036 ht_flush(hash_table_t *table, hash_iter_t flush_func, void *extra)
00037 {
00038   unsigned long retval = 0;
00039   int i;
00040   link_elem_t *elem;
00041 
00042   initialize_dbpr_error_table(); /* initialize error table */
00043 
00044   if (!ht_verify(table)) /* verify arguments */
00045     return DB_ERR_BADARGS;
00046 
00047   if (table->ht_flags & HASH_FLAG_FREEZE) /* don't mess with frozen tables */
00048     return DB_ERR_FROZEN;
00049 
00050   /* walk through all the elements */
00051   for (i = 0; i < table->ht_modulus; i++)
00052     for (elem = ll_first(&table->ht_table[i]); elem;
00053          elem = ll_first(&table->ht_table[i])) {
00054       ht_remove(table, le_object(elem)); /* remove the entry... */
00055 
00056       table->ht_flags |= HASH_FLAG_FREEZE; /* freeze the table */
00057 
00058       if (flush_func) /* call flush function */
00059         retval = (*flush_func)(table, le_object(elem), extra);
00060 
00061       table->ht_flags &= ~HASH_FLAG_FREEZE; /* unfreeze table... */
00062 
00063       if (retval) /* if flush function failed, error out */
00064         return retval;
00065     }
00066 
00067   table->ht_count = 0; /* clear the entry count */
00068 
00069   if (table->ht_flags & HASH_FLAG_AUTOSHRINK) /* shrink the table... */
00070     return ht_free(table); /* by calling ht_free() */
00071 
00072   return 0;
00073 }

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