usr/src/lib/libmtmalloc/tests/reallocs.c

   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
  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 }