umem.c revision 168404 
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 2006 Ricardo Correia.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26#include <umem.h>
27#include <stdlib.h>
28#include <assert.h>
29
30static umem_nofail_callback_t *nofail_cb = NULL;
31
32struct umem_cache {
33	umem_constructor_t *constructor;
34	umem_destructor_t *destructor;
35	void *callback_data;
36	size_t bufsize;
37};
38
39/*
40 * Simple stub for umem_alloc(). The callback isn't expected to return.
41 */
42void *umem_alloc(size_t size, int flags)
43{
44	assert(flags == UMEM_DEFAULT || flags == UMEM_NOFAIL);
45
46	if(size == 0)
47		return NULL;
48
49	void *ret = malloc(size);
50	if(ret == NULL) {
51		if(!(flags & UMEM_NOFAIL))
52			return NULL;
53
54		if(nofail_cb != NULL)
55			nofail_cb();
56		abort();
57	}
58
59	return ret;
60}
61
62/*
63 * Simple stub for umem_zalloc().
64 */
65void *umem_zalloc(size_t size, int flags)
66{
67	assert(flags == UMEM_DEFAULT || flags == UMEM_NOFAIL);
68
69	if(size == 0)
70		return NULL;
71
72	void *ret = calloc(1, size);
73	if(ret == NULL) {
74		if(!(flags & UMEM_NOFAIL))
75			return NULL;
76
77		if(nofail_cb != NULL)
78			nofail_cb();
79		abort();
80	}
81
82	return ret;
83}
84
85/*
86 * Simple stub for umem_free().
87 */
88void umem_free(void *buf, size_t size)
89{
90	free(buf);
91}
92
93/*
94 * Simple stub for umem_nofail_callback().
95 */
96void umem_nofail_callback(umem_nofail_callback_t *callback)
97{
98	nofail_cb = callback;
99}
100
101/*
102 * Simple stub for umem_cache_create().
103 */
104umem_cache_t *umem_cache_create(char *debug_name, size_t bufsize, size_t align, umem_constructor_t *constructor, umem_destructor_t *destructor, umem_reclaim_t *reclaim, void *callback_data, void *source, int cflags)
105{
106	assert(source == NULL);
107
108	umem_cache_t *cache = malloc(sizeof(umem_cache_t));
109	if(cache == NULL)
110		return NULL;
111
112	cache->constructor = constructor;
113	cache->destructor = destructor;
114	cache->callback_data = callback_data;
115	cache->bufsize = bufsize;
116
117	return cache;
118}
119
120/*
121 * Simple stub for umem_cache_alloc(). The nofail callback isn't expected to return.
122 */
123void *umem_cache_alloc(umem_cache_t *cache, int flags)
124{
125	void *buf = malloc(cache->bufsize);
126	if(buf == NULL) {
127		if(!(flags & UMEM_NOFAIL))
128			return NULL;
129
130		if(nofail_cb != NULL)
131			nofail_cb();
132		abort();
133	}
134
135	if(cache->constructor != NULL) {
136		if(cache->constructor(buf, cache->callback_data, flags) != 0) {
137			free(buf);
138			if(!(flags & UMEM_NOFAIL))
139				return NULL;
140
141			if(nofail_cb != NULL)
142				nofail_cb();
143			abort();
144		}
145	}
146
147	return buf;
148}
149
150/*
151 * Simple stub for umem_cache_free().
152 */
153void umem_cache_free(umem_cache_t *cache, void *buffer)
154{
155	if(cache->destructor != NULL)
156		cache->destructor(buffer, cache->callback_data);
157
158	free(buffer);
159}
160
161/*
162 * Simple stub for umem_cache_destroy().
163 */
164void umem_cache_destroy(umem_cache_t *cache)
165{
166	free(cache);
167}
168