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