1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
3 *
4 * Copyright 2016 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 <stdlib.h>
30 #include <string.h>
31 #include <stdio.h>
32 #ifdef __cplusplus
33 #define __STDC_FORMAT_MACROS
34 #endif
35 #include <inttypes.h>
36
37 #include "mempool.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>&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 UCX_EXTERN void ucx_mempool_shared_destr(void* ptr) {
60 ucx_regdestr *rd = (ucx_regdestr*)ptr;
61 rd->destructor(rd->ptr);
62 }
63
64 UcxMempool *ucx_mempool_new(size_t n) {
65 UcxMempool *pool = (UcxMempool*)malloc(sizeof(UcxMempool));
66 if (!pool) {
67 return NULL;
68 }
69
70 pool->data = (void**) malloc(n * sizeof(void*));
71 if (pool->data == NULL) {
72 free(pool);
73 return NULL;
74 }
75
76 pool->ndata = 0;
77 pool->size = n;
78
79 UcxAllocator *allocator = (UcxAllocator*)malloc(sizeof(UcxAllocator));
80 if(!allocator) {
81 free(pool->data);
82 free(pool);
83 return NULL;
84 }
85 allocator->malloc = (ucx_allocator_malloc)ucx_mempool_malloc;
86 allocator->calloc = (ucx_allocator_calloc)ucx_mempool_calloc;
87 allocator->realloc = (ucx_allocator_realloc)ucx_mempool_realloc;
88 allocator->free = (ucx_allocator_free)ucx_mempool_free;
89 allocator->pool = pool;
90 pool->allocator = allocator;
91
92 return pool;
93 }
94
95 int ucx_mempool_chcap(UcxMempool *pool, size_t newcap) {
96 void **data = (void**) realloc(pool->data, newcap*sizeof(void*));
97 if (data) {
98 pool->data = data;
99 pool->size = newcap;
100 return EXIT_SUCCESS;
101 } else {
102 return EXIT_FAILURE;
103 }
104 }
105
106 void *ucx_mempool_malloc(UcxMempool *pool, size_t n) {
107 if (pool->ndata >= pool->size) {
108 // The hard coded 16 is documented for this function and ucx_mempool_new
109 if (ucx_mempool_chcap(pool, pool->size + 16) == EXIT_FAILURE) {
110 return NULL;
111 }
112 }
113
114 ucx_memchunk *mem = (ucx_memchunk*)malloc(sizeof(ucx_destructor) + n);
115 if (!mem) {
116 return NULL;
117 }
118
119 mem->destructor = NULL;
120 pool->data[pool->ndata] = mem;
121 pool->ndata++;
122
123 return &(mem->c);
124 }
125
126 void *ucx_mempool_calloc(UcxMempool *pool, size_t nelem, size_t elsize) {
127 void *ptr = ucx_mempool_malloc(pool, nelem*elsize);
128 if (!ptr) {
129 return NULL;
130 }
131 memset(ptr, 0, nelem * elsize);
132 return ptr;
133 }
134
135 void *ucx_mempool_realloc(UcxMempool *pool, void *ptr, size_t n) {
136 char *mem = ((char*)ptr) - sizeof(ucx_destructor);
137 char *newm = (char*) realloc(mem, n + sizeof(ucx_destructor));
138 if (!newm) {
139 return NULL;
140 }
141 if (mem != newm) {
142 for(size_t i=0 ; i < pool->ndata ; i++) {
143 if(pool->data[i] == mem) {
144 pool->data[i] = newm;
145 return newm + sizeof(ucx_destructor);
146 }
147 }
148 fprintf(stderr, "FATAL: 0x%08" " not in mpool 0x%08"PRIxPTR "\n"PRIxPTR,
149 (intptr_t)ptr, (intptr_t)pool);
150 exit(EXIT_FAILURE);
151 } else {
152 return newm + sizeof(ucx_destructor);
153 }
154 }
155
156 void ucx_mempool_free(UcxMempool *pool, void *ptr) {
157 ucx_memchunk *chunk = (ucx_memchunk*)((char*)ptr-sizeof(ucx_destructor));
158 for(size_t i=0 ; i<pool->ndata ; i++) {
159 if(chunk == pool->data[i]) {
160 if(chunk->destructor != NULL) {
161 chunk->destructor(&(chunk->c));
162 }
163 free(chunk);
164 size_t last_index = pool->ndata - 1;
165 if(i != last_index) {
166 pool->data[i] = pool->data[last_index];
167 pool->data[last_index] = NULL;
168 }
169 pool->ndata--;
170 return;
171 }
172 }
173 fprintf(stderr, "FATAL: 0x%08" " not in mpool 0x%08"PRIxPTR "\n"PRIxPTR,
174 (intptr_t)ptr, (intptr_t)pool);
175 exit(EXIT_FAILURE);
176 }
177
178 void ucx_mempool_destroy(UcxMempool *pool) {
179 ucx_memchunk *chunk;
180 for(size_t i=0 ; i<pool->ndata ; i++) {
181 chunk = (ucx_memchunk*) pool->data[i];
182 if(chunk) {
183 if(chunk->destructor) {
184 chunk->destructor(&(chunk->c));
185 }
186 free(chunk);
187 }
188 }
189 free(pool->data);
190 free(pool->allocator);
191 free(pool);
192 }
193
194 void ucx_mempool_set_destr(void *ptr, ucx_destructor func) {
195 *(ucx_destructor*)((char*)ptr-sizeof(ucx_destructor)) = func;
196 }
197
198 void ucx_mempool_reg_destr(UcxMempool *pool, void *ptr, ucx_destructor destr) {
199 ucx_regdestr *rd = (ucx_regdestr*)ucx_mempool_malloc(
200 pool,
201 sizeof(ucx_regdestr));
202 rd->destructor = destr;
203 rd->ptr = ptr;
204 ucx_mempool_set_destr(rd, ucx_mempool_shared_destr);
205 }
206
207