1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26#include <stdio.h>
27#include <stdlib.h>
28
29/*
30 * realloc() optimization for Small sized caches.
31 * If a malloc'ed buffer can satisfy a realloc() request
32 * as well, it should return the same buffer.
33 *
34 * cc -O -o reallocs reallocs.c -lmtmalloc
35 */
36
37#define	MAX_CACHE_SZ 65536
38
39int
40main()
41{
42	void *p, *q;
43	size_t size;
44
45	for (size = 1; size <= MAX_CACHE_SZ; size++) {
46		p = malloc(size);
47		q = realloc(p, size);
48		if (p != q)
49			(void) fprintf(stderr, "size: %d, p: 0x%p, q: 0x%p\n",
50			    size, p, q);
51		free(q);
52	}
53	return (0);
54}
55