src/cx/allocator.h

Wed, 06 Oct 2021 14:24:52 +0200

author
Mike Becker <universe@uap-core.de>
date
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parent 465
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child 484
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permissions
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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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4 * Copyright 2021 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 * \file allocator.h
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30 * Interface for custom allocators.
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31 */
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32
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33 #ifndef UCX_ALLOCATOR_H
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34 #define UCX_ALLOCATOR_H
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35
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36 #include <stdlib.h>
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37
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38 #ifdef __cplusplus
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39 extern "C" {
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40 #endif
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41
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42 /**
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43 * The class definition for an allocator.
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44 */
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45 typedef struct {
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46 /**
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47 * The allocator's malloc() implementation.
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48 */
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49 void *(*malloc)(void *data, size_t n);
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50
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51 /**
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52 * The allocator's realloc() implementation.
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53 */
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54 void *(*realloc)(void *data, void *mem, size_t n)
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55 __attribute__((__warn_unused_result__));
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56
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57 /**
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58 * The allocator's calloc() implementation.
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59 */
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60 void *(*calloc)(void *data, size_t nelem, size_t n);
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61
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62 /**
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63 * The allocator's free() implementation.
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64 */
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65 void (*free)(void *data, void *mem)
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66 __attribute__((__nonnull__));
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67 } cx_allocator_class;
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68
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69 /**
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70 * Structure holding the data for an allocator.
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71 */
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72 struct cx_allocator_s {
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73 /**
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74 * A pointer to the instance of the allocator class.
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75 */
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76 cx_allocator_class *cl;
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77 /**
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78 * A pointer to the data this allocator uses.
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79 */
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80 void *data;
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81 };
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82
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83 /**
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84 * High-Level type alias for the allocator type.
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85 */
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86 typedef struct cx_allocator_s *CxAllocator;
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87
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88 /**
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89 * A default allocator using standard library malloc() etc.
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90 */
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91 extern CxAllocator cxDefaultAllocator;
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92
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93 /**
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94 * Allocate \p n bytes of memory.
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95 *
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96 * @param allocator the allocator
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97 * @param n the number of bytes
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98 * @return a pointer to the allocated memory
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99 */
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100 void *cxMalloc(CxAllocator allocator, size_t n)
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101 __attribute__((__malloc__))
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102 __attribute__((__alloc_size__(2)));
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103
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104 /**
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105 * Re-allocate the previously allocated block in \p mem, making the new block \p n bytes long.
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106 * This function may return the same pointer that was passed to it, if moving the memory
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107 * was not necessary.
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108 *
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109 * \note Re-allocating a block allocated by a different allocator is undefined.
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110 *
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111 * @param allocator the allocator
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112 * @param mem pointer to the previously allocated block
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113 * @param n the new size in bytes
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114 * @return a pointer to the re-allocated memory
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115 */
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116 void *cxRealloc(CxAllocator allocator, void *mem, size_t n)
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117 __attribute__((__warn_unused_result__))
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118 __attribute__((__alloc_size__(3)));
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119
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120 /**
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121 * Re-allocate a previously allocated block and changes the pointer in-place, if necessary.
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122 * This function acts like cxRealloc() using the pointer pointed to by \p mem.
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123 * On success, the pointer is changed to the new location (in case the
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124 *
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125 * \note Re-allocating a block allocated by a different allocator is undefined.
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126 *
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127 * \par Error handling
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128 * \c errno will be set, if the underlying realloc function does so.
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129 *
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130 * @param allocator the allocator
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131 * @param mem pointer to the pointer to allocated block
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132 * @param n the new size in bytes
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133 * @return zero on success, non-zero on failure
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134 */
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135 int cxReallocate(CxAllocator allocator, void **mem, size_t n)
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136 __attribute__((__nonnull__));
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137
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138 /**
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139 * Allocate \p nelem elements of \p n bytes each, all initialized to zero.
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140 *
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141 * @param allocator the allocator
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142 * @param nelem the number of elements
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143 * @param n the size of each element in bytes
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144 * @return a pointer to the allocated memory
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145 */
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146 void *cxCalloc(CxAllocator allocator, size_t nelem, size_t n)
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147 __attribute__((__malloc__))
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148 __attribute__((__alloc_size__(2, 3)));
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149
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150 /**
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151 * Free a block allocated by this allocator.
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152 *
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153 * \note Freeing a block of a different allocator is undefined.
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154 *
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155 * @param allocator the allocator
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156 * @param mem a pointer to the block to free
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157 */
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158 void cxFree(CxAllocator allocator, void *mem)
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159 __attribute__((__nonnull__));
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160
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161 #ifdef __cplusplus
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162 } /* extern "C" */
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163 #endif
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164
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165 #endif /* UCX_ALLOCATOR_H */

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