ucx/allocator.h

Tue, 03 Oct 2017 14:59:35 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Tue, 03 Oct 2017 14:59:35 +0200
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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 2016 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 * Allocator for custom memory management.
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30 *
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31 * A UCX allocator consists of a pointer to the memory area / pool and four
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32 * function pointers to memory management functions operating on this memory
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33 * area / pool. These functions shall behave equivalent to the standard libc
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34 * functions <code>malloc(), calloc(), realloc()</code> and <code>free()</code>.
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35 *
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36 * The signature of the memory management functions is based on the signature
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37 * of the respective libc function but each of them takes the pointer to the
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38 * memory area / pool as first argument.
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39 *
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40 * As the pointer to the memory area / pool can be arbitrarily chosen, any data
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41 * can be provided to the memory management functions. A UcxMempool is just
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42 * one example.
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43 *
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44 * @see mempool.h
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45 * @see UcxMap
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46 *
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47 * @file allocator.h
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48 * @author Mike Becker
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49 * @author Olaf Wintermann
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50 */
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51
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52 #ifndef UCX_ALLOCATOR_H
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53 #define UCX_ALLOCATOR_H
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54
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55 #include "ucx.h"
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56
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57 #ifdef __cplusplus
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58 extern "C" {
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59 #endif
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60
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61 /**
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62 * A function pointer to the allocators <code>malloc()</code> function.
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63 * @see UcxAllocator
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64 */
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65 typedef void*(*ucx_allocator_malloc)(void *pool, size_t n);
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66
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67 /**
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68 * A function pointer to the allocators <code>calloc()</code> function.
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69 * @see UcxAllocator
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70 */
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71 typedef void*(*ucx_allocator_calloc)(void *pool, size_t n, size_t size);
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72
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73 /**
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74 * A function pointer to the allocators <code>realloc()</code> function.
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75 * @see UcxAllocator
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76 */
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77 typedef void*(*ucx_allocator_realloc)(void *pool, void *data, size_t n);
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78
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79 /**
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80 * A function pointer to the allocators <code>free()</code> function.
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81 * @see UcxAllocator
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82 */
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83 typedef void(*ucx_allocator_free)(void *pool, void *data);
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84
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85 /**
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86 * UCX allocator data structure containing memory management functions.
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87 */
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88 typedef struct {
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89 /** Pointer to an area of memory or a complex memory pool.
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90 * This pointer will be passed to any memory management function as first
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91 * argument.
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92 */
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93 void *pool;
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94 /**
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95 * The <code>malloc()</code> function for this allocator.
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96 */
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97 ucx_allocator_malloc malloc;
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98 /**
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99 * The <code>calloc()</code> function for this allocator.
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100 */
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101 ucx_allocator_calloc calloc;
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102 /**
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103 * The <code>realloc()</code> function for this allocator.
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104 */
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105 ucx_allocator_realloc realloc;
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106 /**
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107 * The <code>free()</code> function for this allocator.
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108 */
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109 ucx_allocator_free free;
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110 } UcxAllocator;
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111
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112 /**
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113 * Returns a pointer to the default allocator.
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114 *
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115 * The default allocator contains wrappers to the standard libc memory
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116 * management functions. Use this function to get a pointer to a globally
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117 * available allocator. You may also define an own UcxAllocator by assigning
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118 * #UCX_ALLOCATOR_DEFAULT to a variable and pass the address of this variable
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119 * to any function that takes a UcxAllocator as argument. Note that using
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120 * this function is the recommended way of passing a default allocator, thus
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121 * it never runs out of scope.
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122 *
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123 * @return a pointer to the default allocator
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124 *
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125 * @see UCX_ALLOCATOR_DEFAULT
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126 */
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127 UcxAllocator *ucx_default_allocator();
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128
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129 /**
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130 * A wrapper for the standard libc <code>malloc()</code> function.
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131 * @param ignore ignored (may be used by allocators for pooled memory)
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132 * @param n argument passed to <code>malloc()</code>
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133 * @return return value of <code>malloc()</code>
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134 */
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135 void *ucx_default_malloc(void *ignore, size_t n);
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136 /**
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137 * A wrapper for the standard libc <code>calloc()</code> function.
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138 * @param ignore ignored (may be used by allocators for pooled memory)
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139 * @param n argument passed to <code>calloc()</code>
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140 * @param size argument passed to <code>calloc()</code>
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141 * @return return value of <code>calloc()</code>
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142 */
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143 void *ucx_default_calloc(void *ignore, size_t n, size_t size);
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144 /**
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145 * A wrapper for the standard libc <code>realloc()</code> function.
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146 * @param ignore ignored (may be used by allocators for pooled memory)
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147 * @param data argumend passed to <code>realloc()</code>
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148 * @param n argument passed to <code>realloc()</code>
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149 * @return return value of <code>realloc()</code>
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150 */
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151 void *ucx_default_realloc(void *ignore, void *data, size_t n);
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152 /**
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153 * A wrapper for the standard libc <code>free()</code> function.
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154 * @param ignore ignored (may be used by allocators for pooled memory)
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155 * @param data argument passed to <code>free()</code>
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156 */
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157 void ucx_default_free(void *ignore, void *data);
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158
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159 /**
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160 * Shorthand for calling an allocators malloc function.
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161 * @param allocator the allocator to use
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162 * @param n size of space to allocate
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163 * @return a pointer to the allocated memory area
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164 */
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165 #define almalloc(allocator, n) ((allocator)->malloc((allocator)->pool, n))
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166
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167 /**
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168 * Shorthand for calling an allocators calloc function.
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169 * @param allocator the allocator to use
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170 * @param n the count of elements the space should be allocated for
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171 * @param size the size of each element
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172 * @return a pointer to the allocated memory area
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173 */
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174 #define alcalloc(allocator, n, size) \
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175 ((allocator)->calloc((allocator)->pool, n, size))
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176
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177 /**
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178 * Shorthand for calling an allocators realloc function.
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179 * @param allocator the allocator to use
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180 * @param ptr the pointer to the memory area that shall be reallocated
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181 * @param n the new size of the allocated memory area
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182 * @return a pointer to the reallocated memory area
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183 */
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184 #define alrealloc(allocator, ptr, n) \
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185 ((allocator)->realloc((allocator)->pool, ptr, n))
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186
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187 /**
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188 * Shorthand for calling an allocators free function.
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189 * @param allocator the allocator to use
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190 * @param ptr the pointer to the memory area that shall be freed
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191 */
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192 #define alfree(allocator, ptr) ((allocator)->free((allocator)->pool, ptr))
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193
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194 /**
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195 * Convenient macro for a default allocator <code>struct</code> definition.
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196 */
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197 #define UCX_ALLOCATOR_DEFAULT {NULL, \
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198 ucx_default_malloc, ucx_default_calloc, ucx_default_realloc, \
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199 ucx_default_free }
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200
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201 #ifdef __cplusplus
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202 }
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203 #endif
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204
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205 #endif /* UCX_ALLOCATOR_H */
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206

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