xref: /titanic_44/usr/src/lib/libmtmalloc/tests/reallocs.c (revision db3659e514c8bf3f03bcca6dd082e363bd7b466a)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <stdio.h>
#include <stdlib.h>

/*
 * realloc() optimization for Small sized caches.
 * If a malloc'ed buffer can satisfy a realloc() request
 * as well, it should return the same buffer.
 *
 * cc -O -o reallocs reallocs.c -lmtmalloc
 */

#define	MAX_CACHE_SZ 65536

int
main()
{
	void *p, *q;
	size_t size;

	for (size = 1; size <= MAX_CACHE_SZ; size++) {
		p = malloc(size);
		q = realloc(p, size);
		if (p != q)
			(void) fprintf(stderr, "size: %d, p: 0x%p, q: 0x%p\n",
			    size, p, q);
		free(q);
	}
	return (0);
}