/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 2000, 2012 Oracle and/or its affiliates.  All rights reserved.
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 * $Id$
 */

#include "db_config.h"

#include "db_int.h"

/*
 * __db_util_cache --
 *	Compute if we have enough cache.
 *
 * PUBLIC: int __db_util_cache __P((DB *, u_int32_t *, int *));
 */
int
__db_util_cache(dbp, cachep, resizep)
	DB *dbp;
	u_int32_t *cachep;
	int *resizep;
{
	u_int32_t pgsize;
	int ret;

	/* Get the current page size. */
	if ((ret = dbp->get_pagesize(dbp, &pgsize)) != 0)
		return (ret);

	/*
	 * The current cache size is in cachep.  If it's insufficient, set the
	 * the memory referenced by resizep to 1 and set cachep to the minimum
	 * size needed.
	 *
	 * Make sure our current cache is big enough.  We want at least
	 * DB_MINPAGECACHE pages in the cache.
	 */
	if ((*cachep / pgsize) < DB_MINPAGECACHE) {
		*resizep = 1;
		*cachep = pgsize * DB_MINPAGECACHE;
	} else
		*resizep = 0;

	return (0);
}