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
39 int
main()40 main()
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