Mon, 06 Mar 2017 16:09:42 +0100
removes unused ucx_mempool_clamp() and changes storage behavior of mempool to increase the capacity by a factor of two
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 */
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>
37 #include "mempool.h"
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;
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;
59 UCX_EXTERN void ucx_mempool_shared_destr(void* ptr) {
60 ucx_regdestr *rd = (ucx_regdestr*)ptr;
61 rd->destructor(rd->ptr);
62 }
64 UcxMempool *ucx_mempool_new(size_t n) {
65 UcxMempool *pool = (UcxMempool*)malloc(sizeof(UcxMempool));
66 if (!pool) {
67 return NULL;
68 }
70 pool->data = (void**) malloc(n * sizeof(void*));
71 if (pool->data == NULL) {
72 free(pool);
73 return NULL;
74 }
76 pool->ndata = 0;
77 pool->size = n;
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;
92 return pool;
93 }
95 int ucx_mempool_chcap(UcxMempool *pool, size_t newcap) {
96 if (newcap < pool->ndata) {
97 return 1;
98 }
100 void **data = (void**) realloc(pool->data, newcap*sizeof(void*));
101 if (data) {
102 pool->data = data;
103 pool->size = newcap;
104 return 0;
105 } else {
106 return 1;
107 }
108 }
110 void *ucx_mempool_malloc(UcxMempool *pool, size_t n) {
111 if (pool->ndata >= pool->size) {
112 if (pool->size*2 < pool->size /* overflow check */
113 || ucx_mempool_chcap(pool, pool->size*2)) {
114 return NULL;
115 }
116 }
118 ucx_memchunk *mem = (ucx_memchunk*)malloc(sizeof(ucx_destructor) + n);
119 if (!mem) {
120 return NULL;
121 }
123 mem->destructor = NULL;
124 pool->data[pool->ndata] = mem;
125 pool->ndata++;
127 return &(mem->c);
128 }
130 void *ucx_mempool_calloc(UcxMempool *pool, size_t nelem, size_t elsize) {
131 void *ptr = ucx_mempool_malloc(pool, nelem*elsize);
132 if (!ptr) {
133 return NULL;
134 }
135 memset(ptr, 0, nelem * elsize);
136 return ptr;
137 }
139 void *ucx_mempool_realloc(UcxMempool *pool, void *ptr, size_t n) {
140 char *mem = ((char*)ptr) - sizeof(ucx_destructor);
141 char *newm = (char*) realloc(mem, n + sizeof(ucx_destructor));
142 if (!newm) {
143 return NULL;
144 }
145 if (mem != newm) {
146 for(size_t i=0 ; i < pool->ndata ; i++) {
147 if(pool->data[i] == mem) {
148 pool->data[i] = newm;
149 return newm + sizeof(ucx_destructor);
150 }
151 }
152 fprintf(stderr, "FATAL: 0x%08" PRIxPTR" not in mpool 0x%08" PRIxPTR"\n",
153 (intptr_t)ptr, (intptr_t)pool);
154 abort();
155 } else {
156 return newm + sizeof(ucx_destructor);
157 }
158 }
160 void ucx_mempool_free(UcxMempool *pool, void *ptr) {
161 ucx_memchunk *chunk = (ucx_memchunk*)((char*)ptr-sizeof(ucx_destructor));
162 for(size_t i=0 ; i<pool->ndata ; i++) {
163 if(chunk == pool->data[i]) {
164 if(chunk->destructor != NULL) {
165 chunk->destructor(&(chunk->c));
166 }
167 free(chunk);
168 size_t last_index = pool->ndata - 1;
169 if(i != last_index) {
170 pool->data[i] = pool->data[last_index];
171 pool->data[last_index] = NULL;
172 }
173 pool->ndata--;
174 return;
175 }
176 }
177 fprintf(stderr, "FATAL: 0x%08" PRIxPTR" not in mpool 0x%08" PRIxPTR"\n",
178 (intptr_t)ptr, (intptr_t)pool);
179 abort();
180 }
182 void ucx_mempool_destroy(UcxMempool *pool) {
183 ucx_memchunk *chunk;
184 for(size_t i=0 ; i<pool->ndata ; i++) {
185 chunk = (ucx_memchunk*) pool->data[i];
186 if(chunk) {
187 if(chunk->destructor) {
188 chunk->destructor(&(chunk->c));
189 }
190 free(chunk);
191 }
192 }
193 free(pool->data);
194 free(pool->allocator);
195 free(pool);
196 }
198 void ucx_mempool_set_destr(void *ptr, ucx_destructor func) {
199 *(ucx_destructor*)((char*)ptr-sizeof(ucx_destructor)) = func;
200 }
202 void ucx_mempool_reg_destr(UcxMempool *pool, void *ptr, ucx_destructor destr) {
203 ucx_regdestr *rd = (ucx_regdestr*)ucx_mempool_malloc(
204 pool,
205 sizeof(ucx_regdestr));
206 rd->destructor = destr;
207 rd->ptr = ptr;
208 ucx_mempool_set_destr(rd, ucx_mempool_shared_destr);
209 }