rt_flush.c

Go to the documentation of this file.

/*
** Copyright (C) 2003 by Kevin L. Mitchell <klmitch@mit.edu>
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Library General Public
** License as published by the Free Software Foundation; either
** version 2 of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
** Library General Public License for more details.
**
** You should have received a copy of the GNU Library General Public
** License along with this library; if not, write to the Free
** Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
** MA 02111-1307, USA
**
** @(#)$Id: rt_flush.c,v 1.2 2006/07/13 19:16:24 klmitch Exp $
*/
#include "dbprim.h"
#include "dbprim_int.h"

RCSTAG("@(#)$Id: rt_flush.c,v 1.2 2006/07/13 19:16:24 klmitch Exp $");

unsigned long
rt_flush(rb_tree_t *tree, rb_iter_t flush_func, void *extra)
{
  unsigned long retval = 0;
  rb_node_t *node;

  initialize_dbpr_error_table(); /* initialize error table */

  if (!rt_verify(tree)) /* verify arguments */
    return DB_ERR_BADARGS;

  if (tree->rt_flags & RBT_FLAG_FREEZE) /* don't mess with frozen trees */
    return DB_ERR_FROZEN;

  /* OK, walk through the nodes... */
  while (tree->rt_root) {
    rt_remove(tree, node = tree->rt_root); /* remove the node... */

    if (flush_func) {
      tree->rt_flags |= RBT_FLAG_FREEZE; /* freeze the table... */

      retval = (*flush_func)(tree, node, extra); /* call flush function */

      tree->rt_flags &= ~RBT_FLAG_FREEZE; /* unfreeze table... */

      if (retval) /* if flush function failed, error out */
        return retval;
    }
  }

  tree->rt_count = 0; /* clear the node count */
  tree->rt_root = 0; /* and the root node... */

  return 0;
}

---