src/mempool.c

Fri, 05 Jul 2019 15:47:57 +0200

author
Mike Becker <universe@uap-core.de>
date
Fri, 05 Jul 2019 15:47:57 +0200
branch
feature/array
changeset 340
8acf182f6424
parent 270
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permissions
-rw-r--r--

adds documentation

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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2f5dea574a75 modules documentation
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4 * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #include "ucx/mempool.h"
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30
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31 #include <stdlib.h>
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32 #include <string.h>
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33 #include <stdio.h>
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34 #ifdef __cplusplus
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35 #define __STDC_FORMAT_MACROS
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36 #endif
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37 #include <inttypes.h>
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38
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39 /** Capsule for destructible memory chunks. */
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40 typedef struct {
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41 /** The destructor for the memory chunk. */
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42 ucx_destructor destructor;
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43 /**
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44 * First byte of the memory chunk.
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45 * Note, that the address <code>&amp;c</code> is also the address
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46 * of the whole memory chunk.
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47 */
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48 char c;
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49 } ucx_memchunk;
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50
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51 /** Capsule for data and its destructor. */
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52 typedef struct {
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53 /** The destructor for the data. */
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54 ucx_destructor destructor;
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55 /** A pointer to the data. */
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56 void *ptr;
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57 } ucx_regdestr;
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58
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59 #ifdef __cplusplus
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60 extern "C"
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61 #endif
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62 void ucx_mempool_shared_destr(void* ptr) {
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63 ucx_regdestr *rd = (ucx_regdestr*)ptr;
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64 rd->destructor(rd->ptr);
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65 }
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66
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67 UcxMempool *ucx_mempool_new(size_t n) {
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68 size_t poolsz;
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69 if(ucx_szmul(n, sizeof(void*), &poolsz)) {
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70 return NULL;
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71 }
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72
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73 UcxMempool *pool = (UcxMempool*)malloc(sizeof(UcxMempool));
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74 if (!pool) {
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75 return NULL;
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76 }
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77
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78 pool->data = (void**) malloc(poolsz);
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79 if (pool->data == NULL) {
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80 free(pool);
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81 return NULL;
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82 }
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83
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84 pool->ndata = 0;
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85 pool->size = n;
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86
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87 UcxAllocator *allocator = (UcxAllocator*)malloc(sizeof(UcxAllocator));
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88 if(!allocator) {
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89 free(pool->data);
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90 free(pool);
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91 return NULL;
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92 }
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93 allocator->malloc = (ucx_allocator_malloc)ucx_mempool_malloc;
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94 allocator->calloc = (ucx_allocator_calloc)ucx_mempool_calloc;
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95 allocator->realloc = (ucx_allocator_realloc)ucx_mempool_realloc;
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96 allocator->free = (ucx_allocator_free)ucx_mempool_free;
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97 allocator->pool = pool;
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98 pool->allocator = allocator;
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99
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100 return pool;
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101 }
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102
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103 int ucx_mempool_chcap(UcxMempool *pool, size_t newcap) {
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104 if (newcap < pool->ndata) {
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105 return 1;
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106 }
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107
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108 size_t newcapsz;
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109 if(ucx_szmul(newcap, sizeof(void*), &newcapsz)) {
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110 return 1;
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111 }
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112
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113 void **data = (void**) realloc(pool->data, newcapsz);
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114 if (data) {
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115 pool->data = data;
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116 pool->size = newcap;
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117 return 0;
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118 } else {
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119 return 1;
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120 }
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121 }
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122
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123 void *ucx_mempool_malloc(UcxMempool *pool, size_t n) {
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124 if(((size_t)-1) - sizeof(ucx_destructor) < n) {
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125 return NULL;
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126 }
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127
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128 if (pool->ndata >= pool->size) {
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129 size_t newcap = pool->size*2;
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130 if (newcap < pool->size || ucx_mempool_chcap(pool, newcap)) {
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131 return NULL;
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132 }
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133 }
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134
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135 void *p = malloc(sizeof(ucx_destructor) + n);
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136 ucx_memchunk *mem = (ucx_memchunk*)p;
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137 if (!mem) {
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138 return NULL;
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139 }
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141 mem->destructor = NULL;
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142 pool->data[pool->ndata] = mem;
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143 pool->ndata++;
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144
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145 return &(mem->c);
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146 }
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147
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148 void *ucx_mempool_calloc(UcxMempool *pool, size_t nelem, size_t elsize) {
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149 size_t msz;
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150 if(ucx_szmul(nelem, elsize, &msz)) {
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151 return NULL;
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152 }
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153
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154 void *ptr = ucx_mempool_malloc(pool, msz);
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155 if (!ptr) {
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156 return NULL;
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157 }
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158 memset(ptr, 0, nelem * elsize);
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159 return ptr;
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160 }
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161
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162 void *ucx_mempool_realloc(UcxMempool *pool, void *ptr, size_t n) {
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163 if(((size_t)-1) - sizeof(ucx_destructor) < n) {
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164 return NULL;
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165 }
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166
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167 char *mem = ((char*)ptr) - sizeof(ucx_destructor);
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168 char *newm = (char*) realloc(mem, n + sizeof(ucx_destructor));
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169 if (!newm) {
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170 return NULL;
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171 }
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172 if (mem != newm) {
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173 for(size_t i=0 ; i < pool->ndata ; i++) {
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174 if(pool->data[i] == mem) {
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175 pool->data[i] = newm;
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176 return newm + sizeof(ucx_destructor);
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177 }
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178 }
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179 fprintf(stderr, "FATAL: 0x%08" PRIxPTR" not in mpool 0x%08" PRIxPTR"\n",
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180 (intptr_t)ptr, (intptr_t)pool);
241
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181 abort();
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182 } else {
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183 return newm + sizeof(ucx_destructor);
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184 }
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185 }
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186
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187 void ucx_mempool_free(UcxMempool *pool, void *ptr) {
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188 ucx_memchunk *chunk = (ucx_memchunk*)((char*)ptr-sizeof(ucx_destructor));
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189 for(size_t i=0 ; i<pool->ndata ; i++) {
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190 if(chunk == pool->data[i]) {
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191 if(chunk->destructor != NULL) {
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192 chunk->destructor(&(chunk->c));
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193 }
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194 free(chunk);
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195 size_t last_index = pool->ndata - 1;
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196 if(i != last_index) {
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197 pool->data[i] = pool->data[last_index];
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198 pool->data[last_index] = NULL;
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199 }
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200 pool->ndata--;
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201 return;
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202 }
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203 }
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204 fprintf(stderr, "FATAL: 0x%08" PRIxPTR" not in mpool 0x%08" PRIxPTR"\n",
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205 (intptr_t)ptr, (intptr_t)pool);
240
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206 abort();
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207 }
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208
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209 void ucx_mempool_destroy(UcxMempool *pool) {
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210 ucx_memchunk *chunk;
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211 for(size_t i=0 ; i<pool->ndata ; i++) {
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212 chunk = (ucx_memchunk*) pool->data[i];
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213 if(chunk) {
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214 if(chunk->destructor) {
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215 chunk->destructor(&(chunk->c));
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216 }
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217 free(chunk);
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218 }
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219 }
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220 free(pool->data);
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221 free(pool->allocator);
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222 free(pool);
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223 }
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224
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225 void ucx_mempool_set_destr(void *ptr, ucx_destructor func) {
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226 *(ucx_destructor*)((char*)ptr-sizeof(ucx_destructor)) = func;
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227 }
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228
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229 void ucx_mempool_reg_destr(UcxMempool *pool, void *ptr, ucx_destructor destr) {
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230 ucx_regdestr *rd = (ucx_regdestr*)ucx_mempool_malloc(
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231 pool,
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232 sizeof(ucx_regdestr));
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233 rd->destructor = destr;
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234 rd->ptr = ptr;
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235 ucx_mempool_set_destr(rd, ucx_mempool_shared_destr);
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236 }
113
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237

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