reallocs.c revision 8754:eb4a954b9317
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