docs/src/modules.md

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date
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rename LICENSE to COPYING to be distributed by autoconf

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1 Modules
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2 =======
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3
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4 UCX provides several modules for data structures and algorithms.
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5 You may choose to use specific modules by inclueding the corresponding header
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6 file.
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7 Please note, that some modules make use of other UCX modules.
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8 For instance, the [Allocator](#allocator) module is used by many other modules
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9 to allow flexible memory allocation.
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10 By default the header files are placed into an `ucx` directory within your
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11 systems include directory. In this case you can use an module by including it
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12 via `#include <ucx/MODULENAME.h>`.
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13 Required modules are included automatically.
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14
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15 <a name="allocator"></a>
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16
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17 ## Allocator
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18
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19 *Header file:* [allocator.h](api/allocator_8h.html)
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20 *Required modules:* None.
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21
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22 A UCX allocator consists of a pointer to the memory area / pool and four
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23 function pointers to memory management functions operating on this memory
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24 area / pool. These functions shall behave equivalent to the standard libc
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25 functions `malloc`, `calloc`, `realloc` and `free`.
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26
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27 The signature of the memory management functions is based on the signature
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28 of the respective libc function but each of them takes the pointer to the
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29 memory area / pool as first argument.
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30
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31 As the pointer to the memory area / pool can be arbitrarily chosen, any data
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32 can be provided to the memory management functions. One example is the
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33 [UCX Memory Pool](#mempool).
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34
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35 <a name="avl"></a>
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36
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37 ## AVL Tree
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38
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39 *Header file:* [avl.h](api/avl_8h.html)
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40 *Required modules:* [Allocator](#allocator)
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41
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42 This binary search tree implementation allows average O(1) insertion and
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43 removal of elements (excluding binary search time).
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44 All common binary tree operations are implemented. Furthermore, this module
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45 provides search functions via lower and upper bounds.
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46
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47 <a name="buffer"></a>
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48
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49 ## Buffer
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50
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51 *Header file:* [buffer.h](api/buffer_8h.html)
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52 *Required modules:* None.
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53
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54 Instances of this buffer implementation can be used to read from or to write to
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55 memory like you would do with a stream. This allows the use of
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56 `ucx_stream_copy` from the [Utilities](#utils) module to copy contents from one
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57 buffer to another or from file or network streams to the buffer and
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58 vice-versa.
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59
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60 More features for convenient use of the buffer can be enabled, like automatic
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61 memory management and automatic resizing of the buffer space.
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62 See the documentation of the macro constants in the header file for more
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63 information.
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64
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65 <a name="list"></a>
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66
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67 ## List
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68
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69 *Header file:* [list.h](api/list_8h.html)
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70 *Required modules:* [Allocator](#allocator)
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71
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72 This module provides the data structure and several functions for a doubly
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73 linked list. Among the common operations like insert, remove, search and sort,
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74 we allow convenient iteration via a special `UCX_FOREACH` macro.
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75
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76 <a name="logging"></a>
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77
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78 ## Logging
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79
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80 *Header file:* [logging.h](api/logging_8h.html)
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81 *Required modules:* [Map](#map), [String](#string)
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82
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83 The logging module comes with some predefined log levels and allows some more
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84 customization. You may choose if you want to get timestamps or source file and
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85 line number logged automatically when outputting a message.
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86
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87
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88 <a name="map"></a>
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89
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90 ## Map
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91
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92 *Header file:* [map.h](api/map_8h.html)
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93 *Required modules:* [Allocator](#allocator), [String](#string)
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94
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95 This module provides a hash map implementation using murmur hash 2 and separate
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96 chaining with linked lists. Similarly to the list module, we provide a
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97 `UCX_MAP_FOREACH` macro to conveniently iterate through the key/value pairs.
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98
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99 <a name="mempool"></a>
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100
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101 ## Memory Pool
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102
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103 *Header file:* [mempool.h](api/mempool_8h.html)
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104 *Required modules:* [Allocator](#allocator)
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105
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106 Here we have a concrete allocator implementation in the sense of a memory pool.
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107 This pool allows you to register destructor functions for the allocated memory,
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108 which are automatically called on the destruction of the pool.
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109 But you may also register *independent* destructor functions within a pool in
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110 case, some external library allocated memory for you, which you wish to be
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111 destroyed together with this pool.
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112
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113 <a name="properties"></a>
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114
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115 ## Properties
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116
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117 *Header file:* [properties.h](api/properties_8h.html)
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118 *Required modules:* [Map](#map)
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119
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120 This module provides load and store function for `*.properties` files.
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121 The key/value pairs are stored within an UCX Map.
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122
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123 <a name="stack"></a>
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124
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125 ## Stack
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126
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127 *Header file:* [stack.h](api/stack_8h.html)
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128 *Required modules:* [Allocator](#allocator)
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129
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130 This concrete implementation of an UCX Allocator allows you to grab some amount
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131 of memory which is then handled as a stack.
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132 Please note, that the term *stack* only refers to the behavior of this
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133 allocator. You may still choose if you want to use stack or heap memory
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134 for the underlying space.
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135
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136 A typical use case is an algorithm where you need to allocate and free large
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137 amounts of memory very frequently.
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138
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139 <a name="string"></a>
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140
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141 ## String
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142
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143 *Header file:* [string.h](api/string_8h.html)
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144 *Required modules:* [Allocator](#allocator)
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145
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146 This module provides a safe implementation of bounded string.
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147 Usually C strings do not carry a length. While for zero-terminated strings you
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148 can easily get the length with `strlen`, this is not generally possible for
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149 arbitrary strings.
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150 The `sstr_t` type of this module always carries the string and its length to
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151 reduce the risk of buffer overflows dramatically.
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152
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153 <a name="test"></a>
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154
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155 ## Testing
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156
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157 *Header file:* [test.h](api/test_8h.html)
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158 *Required modules:* None.
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159
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160 This module provides a testing framework which allows you to execute test cases
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161 within test suites.
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162 To avoid code duplication within tests, we also provide the possibility to
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163 define test subroutines.
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164
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165 <a name="utils"></a>
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166
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167 ## Utilities
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168
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169 *Header file:* [utils.h](api/utils_8h.html)
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170 *Required modules:* [Allocator](#allocator), [String](#string)
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171
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172 In this module we provide very general utility function for copy and compare
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173 operations.
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174 We also provide several `printf` variants to conveniently print formatted data
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175 to streams or strings.
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176

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