2 * This module derived from code donated to the FreeBSD Project by
3 * Matthew Dillon <dillon@backplane.com>
5 * Copyright (c) 1998 The FreeBSD Project
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * $FreeBSD: src/lib/libstand/zalloc_malloc.c,v 1.5 1999/08/28 00:05:35 peter Exp $
30 * $DragonFly: src/lib/libstand/zalloc_malloc.c,v 1.3 2005/03/13 15:10:03 swildner Exp $
34 * MALLOC.C - malloc equivalent, runs on top of zalloc and uses sbrk
37 #include "zalloc_defs.h"
39 static MemPool MallocPool;
43 static int MallocCount;
45 void mallocstats(void);
59 bytes += MALLOCALIGN + 1;
64 while ((res = znalloc(&MallocPool, bytes)) == NULL) {
65 int incr = (bytes + BLKEXTENDMASK) & ~BLKEXTENDMASK;
68 if ((base = sbrk(incr)) == (char *)-1)
70 zextendPool(&MallocPool, base, incr);
71 zfree(&MallocPool, base, incr);
74 if (++MallocCount > MallocMax)
75 MallocMax = MallocCount;
78 res->ga_Magic = GAMAGIC;
80 res->ga_Bytes = bytes;
82 *((char *)res + bytes - 1) = -2;
84 return((char *)res + MALLOCALIGN);
93 Guard *res = (void *)((char *)ptr - MALLOCALIGN);
96 if (res->ga_Magic != GAMAGIC)
97 panic("free: guard1x fail @ %p", ptr);
101 if (*((char *)res + res->ga_Bytes - 1) != -2) {
102 panic("free: guard2 fail @ %p + %d %d/-2",
104 res->ga_Bytes - MALLOCALIGN - 1,
105 *((char *)res + res->ga_Bytes - 1));
107 *((char *)res + res->ga_Bytes - 1) = -1;
110 bytes = res->ga_Bytes;
111 zfree(&MallocPool, res, bytes);
120 calloc(size_t n1, size_t n2)
122 uintptr_t bytes = (uintptr_t)n1 * (uintptr_t)n2;
125 if ((res = malloc(bytes)) != NULL) {
128 if (++MallocCount > MallocMax)
129 MallocMax = MallocCount;
136 * realloc() - I could be fancier here and free the old buffer before
137 * allocating the new one (saving potential fragmentation
138 * and potential buffer copies). But I don't bother.
142 realloc(void *ptr, size_t size)
147 if ((res = malloc(size)) != NULL) {
149 old = *(size_t *)((char *)ptr - MALLOCALIGN) - MALLOCALIGN;
154 bcopy(ptr, res, old);
156 bcopy(ptr, res, size);
160 if (++MallocCount > MallocMax)
161 MallocMax = MallocCount;
163 if (DidAtExit == 0) {
175 reallocf(void *ptr, size_t size)
179 if ((res = realloc(ptr, size)) == NULL)
189 printf("Active Allocations: %d/%d\n", MallocCount, MallocMax);
191 zallocstats(&MallocPool);