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comparison: src/mempool.c

src/mempool.c

changeset 390
d345541018fa
parent 270
3d80d425543b
equal deleted inserted replaced
389:92e482410453 390:d345541018fa
1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
3 *
4 * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include "ucx/mempool.h"
30
31 #include <stdlib.h>
32 #include <string.h>
33 #include <stdio.h>
34 #ifdef __cplusplus
35 #define __STDC_FORMAT_MACROS
36 #endif
37 #include <inttypes.h>
38
39 /** Capsule for destructible memory chunks. */
40 typedef struct {
41 /** The destructor for the memory chunk. */
42 ucx_destructor destructor;
43 /**
44 * First byte of the memory chunk.
45 * Note, that the address <code>&amp;c</code> is also the address
46 * of the whole memory chunk.
47 */
48 char c;
49 } ucx_memchunk;
50
51 /** Capsule for data and its destructor. */
52 typedef struct {
53 /** The destructor for the data. */
54 ucx_destructor destructor;
55 /** A pointer to the data. */
56 void *ptr;
57 } ucx_regdestr;
58
59 #ifdef __cplusplus
60 extern "C"
61 #endif
62 void ucx_mempool_shared_destr(void* ptr) {
63 ucx_regdestr *rd = (ucx_regdestr*)ptr;
64 rd->destructor(rd->ptr);
65 }
66
67 UcxMempool *ucx_mempool_new(size_t n) {
68 size_t poolsz;
69 if(ucx_szmul(n, sizeof(void*), &poolsz)) {
70 return NULL;
71 }
72
73 UcxMempool *pool = (UcxMempool*)malloc(sizeof(UcxMempool));
74 if (!pool) {
75 return NULL;
76 }
77
78 pool->data = (void**) malloc(poolsz);
79 if (pool->data == NULL) {
80 free(pool);
81 return NULL;
82 }
83
84 pool->ndata = 0;
85 pool->size = n;
86
87 UcxAllocator *allocator = (UcxAllocator*)malloc(sizeof(UcxAllocator));
88 if(!allocator) {
89 free(pool->data);
90 free(pool);
91 return NULL;
92 }
93 allocator->malloc = (ucx_allocator_malloc)ucx_mempool_malloc;
94 allocator->calloc = (ucx_allocator_calloc)ucx_mempool_calloc;
95 allocator->realloc = (ucx_allocator_realloc)ucx_mempool_realloc;
96 allocator->free = (ucx_allocator_free)ucx_mempool_free;
97 allocator->pool = pool;
98 pool->allocator = allocator;
99
100 return pool;
101 }
102
103 int ucx_mempool_chcap(UcxMempool *pool, size_t newcap) {
104 if (newcap < pool->ndata) {
105 return 1;
106 }
107
108 size_t newcapsz;
109 if(ucx_szmul(newcap, sizeof(void*), &newcapsz)) {
110 return 1;
111 }
112
113 void **data = (void**) realloc(pool->data, newcapsz);
114 if (data) {
115 pool->data = data;
116 pool->size = newcap;
117 return 0;
118 } else {
119 return 1;
120 }
121 }
122
123 void *ucx_mempool_malloc(UcxMempool *pool, size_t n) {
124 if(((size_t)-1) - sizeof(ucx_destructor) < n) {
125 return NULL;
126 }
127
128 if (pool->ndata >= pool->size) {
129 size_t newcap = pool->size*2;
130 if (newcap < pool->size || ucx_mempool_chcap(pool, newcap)) {
131 return NULL;
132 }
133 }
134
135 void *p = malloc(sizeof(ucx_destructor) + n);
136 ucx_memchunk *mem = (ucx_memchunk*)p;
137 if (!mem) {
138 return NULL;
139 }
140
141 mem->destructor = NULL;
142 pool->data[pool->ndata] = mem;
143 pool->ndata++;
144
145 return &(mem->c);
146 }
147
148 void *ucx_mempool_calloc(UcxMempool *pool, size_t nelem, size_t elsize) {
149 size_t msz;
150 if(ucx_szmul(nelem, elsize, &msz)) {
151 return NULL;
152 }
153
154 void *ptr = ucx_mempool_malloc(pool, msz);
155 if (!ptr) {
156 return NULL;
157 }
158 memset(ptr, 0, nelem * elsize);
159 return ptr;
160 }
161
162 void *ucx_mempool_realloc(UcxMempool *pool, void *ptr, size_t n) {
163 if(((size_t)-1) - sizeof(ucx_destructor) < n) {
164 return NULL;
165 }
166
167 char *mem = ((char*)ptr) - sizeof(ucx_destructor);
168 char *newm = (char*) realloc(mem, n + sizeof(ucx_destructor));
169 if (!newm) {
170 return NULL;
171 }
172 if (mem != newm) {
173 for(size_t i=0 ; i < pool->ndata ; i++) {
174 if(pool->data[i] == mem) {
175 pool->data[i] = newm;
176 return newm + sizeof(ucx_destructor);
177 }
178 }
179 fprintf(stderr, "FATAL: 0x%08" PRIxPTR" not in mpool 0x%08" PRIxPTR"\n",
180 (intptr_t)ptr, (intptr_t)pool);
181 abort();
182 } else {
183 return newm + sizeof(ucx_destructor);
184 }
185 }
186
187 void ucx_mempool_free(UcxMempool *pool, void *ptr) {
188 ucx_memchunk *chunk = (ucx_memchunk*)((char*)ptr-sizeof(ucx_destructor));
189 for(size_t i=0 ; i<pool->ndata ; i++) {
190 if(chunk == pool->data[i]) {
191 if(chunk->destructor != NULL) {
192 chunk->destructor(&(chunk->c));
193 }
194 free(chunk);
195 size_t last_index = pool->ndata - 1;
196 if(i != last_index) {
197 pool->data[i] = pool->data[last_index];
198 pool->data[last_index] = NULL;
199 }
200 pool->ndata--;
201 return;
202 }
203 }
204 fprintf(stderr, "FATAL: 0x%08" PRIxPTR" not in mpool 0x%08" PRIxPTR"\n",
205 (intptr_t)ptr, (intptr_t)pool);
206 abort();
207 }
208
209 void ucx_mempool_destroy(UcxMempool *pool) {
210 ucx_memchunk *chunk;
211 for(size_t i=0 ; i<pool->ndata ; i++) {
212 chunk = (ucx_memchunk*) pool->data[i];
213 if(chunk) {
214 if(chunk->destructor) {
215 chunk->destructor(&(chunk->c));
216 }
217 free(chunk);
218 }
219 }
220 free(pool->data);
221 free(pool->allocator);
222 free(pool);
223 }
224
225 void ucx_mempool_set_destr(void *ptr, ucx_destructor func) {
226 *(ucx_destructor*)((char*)ptr-sizeof(ucx_destructor)) = func;
227 }
228
229 void ucx_mempool_reg_destr(UcxMempool *pool, void *ptr, ucx_destructor destr) {
230 ucx_regdestr *rd = (ucx_regdestr*)ucx_mempool_malloc(
231 pool,
232 sizeof(ucx_regdestr));
233 rd->destructor = destr;
234 rd->ptr = ptr;
235 ucx_mempool_set_destr(rd, ucx_mempool_shared_destr);
236 }
237

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