1 | /* SPDX-License-Identifier: BSD-2-Clause */ |
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2 | |
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3 | /** |
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4 | * @file |
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5 | * |
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6 | * @brief This header file defines the Region Manager API. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (C) 2020, 2021 embedded brains GmbH (http://www.embedded-brains.de) |
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11 | * Copyright (C) 1988, 2008 On-Line Applications Research Corporation (OAR) |
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12 | * |
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13 | * Redistribution and use in source and binary forms, with or without |
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14 | * modification, are permitted provided that the following conditions |
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15 | * are met: |
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16 | * 1. Redistributions of source code must retain the above copyright |
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17 | * notice, this list of conditions and the following disclaimer. |
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18 | * 2. Redistributions in binary form must reproduce the above copyright |
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19 | * notice, this list of conditions and the following disclaimer in the |
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20 | * documentation and/or other materials provided with the distribution. |
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21 | * |
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22 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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23 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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26 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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27 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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28 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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29 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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30 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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31 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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32 | * POSSIBILITY OF SUCH DAMAGE. |
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33 | */ |
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34 | |
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35 | /* |
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36 | * This file is part of the RTEMS quality process and was automatically |
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37 | * generated. If you find something that needs to be fixed or |
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38 | * worded better please post a report or patch to an RTEMS mailing list |
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39 | * or raise a bug report: |
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40 | * |
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41 | * https://www.rtems.org/bugs.html |
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42 | * |
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43 | * For information on updating and regenerating please refer to the How-To |
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44 | * section in the Software Requirements Engineering chapter of the |
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45 | * RTEMS Software Engineering manual. The manual is provided as a part of |
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46 | * a release. For development sources please refer to the online |
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47 | * documentation at: |
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48 | * |
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49 | * https://docs.rtems.org |
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50 | */ |
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51 | |
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52 | /* Generated from spec:/rtems/region/if/header */ |
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53 | |
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54 | #ifndef _RTEMS_RTEMS_REGION_H |
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55 | #define _RTEMS_RTEMS_REGION_H |
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56 | |
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57 | #include <stdint.h> |
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58 | #include <rtems/rtems/attr.h> |
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59 | #include <rtems/rtems/options.h> |
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60 | #include <rtems/rtems/status.h> |
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61 | #include <rtems/rtems/types.h> |
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62 | #include <rtems/score/heapinfo.h> |
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63 | |
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64 | #ifdef __cplusplus |
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65 | extern "C" { |
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66 | #endif |
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67 | |
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68 | /* Generated from spec:/rtems/region/if/group */ |
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69 | |
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70 | /** |
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71 | * @defgroup RTEMSAPIClassicRegion Region Manager |
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72 | * |
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73 | * @ingroup RTEMSAPIClassic |
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74 | * |
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75 | * @brief The Region Manager provides facilities to dynamically allocate memory |
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76 | * in variable sized units. |
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77 | */ |
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78 | |
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79 | /* Generated from spec:/rtems/region/if/get-segment-size */ |
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80 | |
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81 | /** |
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82 | * @ingroup RTEMSAPIClassicRegion |
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83 | * |
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84 | * @brief Gets the size of the region segment. |
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85 | * |
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86 | * @param id is the region identifier. |
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87 | * |
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88 | * @param segment is the begin address of the segment. |
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89 | * |
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90 | * @param[out] size is the pointer to a uintptr_t object. When the directive |
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91 | * call is successful, the size of the segment in bytes will be stored in |
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92 | * this object. |
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93 | * |
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94 | * This directive obtains the size in bytes of the segment specified by |
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95 | * ``segment`` of the region specified by ``id`` in ``size``. |
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96 | * |
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97 | * @retval ::RTEMS_SUCCESSFUL The requested operation was successful. |
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98 | * |
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99 | * @retval ::RTEMS_INVALID_ADDRESS The ``segment`` parameter was NULL. |
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100 | * |
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101 | * @retval ::RTEMS_INVALID_ADDRESS The ``size`` parameter was NULL. |
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102 | * |
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103 | * @retval ::RTEMS_INVALID_ID There was no region associated with the |
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104 | * identifier specified by ``id``. |
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105 | * |
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106 | * @retval ::RTEMS_INVALID_ADDRESS The segment was not within the region. |
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107 | * |
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108 | * @par Notes |
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109 | * The actual length of the allocated segment may be larger than the requested |
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110 | * size because a segment size is always a multiple of the region's page size. |
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111 | * |
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112 | * @par Constraints |
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113 | * @parblock |
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114 | * The following constraints apply to this directive: |
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115 | * |
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116 | * * The directive may be called from within device driver initialization |
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117 | * context. |
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118 | * |
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119 | * * The directive may be called from within task context. |
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120 | * |
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121 | * * The directive may obtain and release the object allocator mutex. This may |
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122 | * cause the calling task to be preempted. |
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123 | * @endparblock |
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124 | */ |
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125 | rtems_status_code rtems_region_get_segment_size( |
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126 | rtems_id id, |
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127 | void *segment, |
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128 | uintptr_t *size |
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129 | ); |
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130 | |
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131 | /* Generated from spec:/rtems/region/if/create */ |
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132 | |
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133 | /** |
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134 | * @ingroup RTEMSAPIClassicRegion |
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135 | * |
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136 | * @brief Creates a region. |
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137 | * |
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138 | * @param name is the object name of the region. |
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139 | * |
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140 | * @param starting_address is the starting address of the memory area managed |
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141 | * by the region. |
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142 | * |
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143 | * @param length is the length in bytes of the memory area managed by the |
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144 | * region. |
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145 | * |
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146 | * @param page_size is the alignment of the starting address and length of each |
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147 | * allocated segment of the region. |
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148 | * |
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149 | * @param attribute_set is the attribute set of the region. |
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150 | * |
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151 | * @param[out] id is the pointer to an ::rtems_id object. When the directive |
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152 | * call is successful, the identifier of the created region will be stored in |
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153 | * this object. |
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154 | * |
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155 | * This directive creates a region which resides on the local node. The region |
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156 | * has the user-defined object name specified in ``name``. The assigned object |
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157 | * identifier is returned in ``id``. This identifier is used to access the |
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158 | * region with other region related directives. |
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159 | * |
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160 | * The region manages the **contiguous memory area** which starts at |
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161 | * ``starting_address`` and is ``length`` bytes long. The memory area shall be |
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162 | * large enough to contain some internal region administration data. |
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163 | * |
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164 | * The **starting address** and **length of segments** allocated from the |
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165 | * region will be an integral multiple of ``page_size``. The specified page |
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166 | * size will be aligned to an implementation-dependent minimum alignment if |
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167 | * necessary. |
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168 | * |
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169 | * The **attribute set** specified in ``attribute_set`` is built through a |
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170 | * *bitwise or* of the attribute constants described below. Not all |
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171 | * combinations of attributes are allowed. Some attributes are mutually |
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172 | * exclusive. If mutually exclusive attributes are combined, the behaviour is |
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173 | * undefined. Attributes not mentioned below are not evaluated by this |
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174 | * directive and have no effect. Default attributes can be selected by using |
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175 | * the #RTEMS_DEFAULT_ATTRIBUTES constant. |
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176 | * |
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177 | * The **task wait queue discipline** is selected by the mutually exclusive |
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178 | * #RTEMS_FIFO and #RTEMS_PRIORITY attributes. The discipline defines the order |
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179 | * in which tasks wait for allocatable segments on a currently empty region. |
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180 | * |
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181 | * * The **FIFO discipline** is the default and can be emphasized through use |
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182 | * of the #RTEMS_FIFO attribute. |
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183 | * |
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184 | * * The **priority discipline** is selected by the #RTEMS_PRIORITY attribute. |
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185 | * |
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186 | * @retval ::RTEMS_SUCCESSFUL The requested operation was successful. |
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187 | * |
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188 | * @retval ::RTEMS_INVALID_NAME The ``name`` parameter was invalid. |
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189 | * |
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190 | * @retval ::RTEMS_INVALID_ADDRESS The ``id`` parameter was NULL. |
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191 | * |
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192 | * @retval ::RTEMS_INVALID_ADDRESS The ``starting_address`` parameter was NULL. |
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193 | * |
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194 | * @retval ::RTEMS_TOO_MANY There was no inactive object available to create a |
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195 | * region. The number of regions available to the application is configured |
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196 | * through the #CONFIGURE_MAXIMUM_REGIONS application configuration option. |
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197 | * |
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198 | * @retval ::RTEMS_INVALID_SIZE The ``page_size`` parameter was invalid. |
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199 | * |
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200 | * @retval ::RTEMS_INVALID_SIZE The memory area specified in |
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201 | * ``starting_address`` and ``length`` was too small. |
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202 | * |
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203 | * @par Notes |
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204 | * For control and maintenance of the region, RTEMS allocates a RNCB from the |
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205 | * local RNCB free pool and initializes it. |
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206 | * |
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207 | * @par Constraints |
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208 | * @parblock |
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209 | * The following constraints apply to this directive: |
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210 | * |
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211 | * * The directive may be called from within device driver initialization |
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212 | * context. |
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213 | * |
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214 | * * The directive may be called from within task context. |
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215 | * |
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216 | * * The directive may obtain and release the object allocator mutex. This may |
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217 | * cause the calling task to be preempted. |
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218 | * |
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219 | * * The number of regions available to the application is configured through |
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220 | * the #CONFIGURE_MAXIMUM_REGIONS application configuration option. |
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221 | * |
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222 | * * Where the object class corresponding to the directive is configured to use |
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223 | * unlimited objects, the directive may allocate memory from the RTEMS |
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224 | * Workspace. |
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225 | * @endparblock |
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226 | */ |
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227 | rtems_status_code rtems_region_create( |
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228 | rtems_name name, |
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229 | void *starting_address, |
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230 | uintptr_t length, |
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231 | uintptr_t page_size, |
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232 | rtems_attribute attribute_set, |
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233 | rtems_id *id |
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234 | ); |
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235 | |
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236 | /* Generated from spec:/rtems/region/if/ident */ |
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237 | |
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238 | /** |
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239 | * @ingroup RTEMSAPIClassicRegion |
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240 | * |
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241 | * @brief Identifies a region by the object name. |
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242 | * |
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243 | * @param name is the object name to look up. |
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244 | * |
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245 | * @param[out] id is the pointer to an ::rtems_id object. When the directive |
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246 | * call is successful, the object identifier of an object with the specified |
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247 | * name will be stored in this object. |
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248 | * |
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249 | * This directive obtains a region identifier associated with the region name |
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250 | * specified in ``name``. |
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251 | * |
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252 | * @retval ::RTEMS_SUCCESSFUL The requested operation was successful. |
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253 | * |
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254 | * @retval ::RTEMS_INVALID_ADDRESS The ``id`` parameter was NULL. |
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255 | * |
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256 | * @retval ::RTEMS_INVALID_NAME The ``name`` parameter was 0. |
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257 | * |
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258 | * @retval ::RTEMS_INVALID_NAME There was no object with the specified name on |
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259 | * the local node. |
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260 | * |
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261 | * @par Notes |
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262 | * @parblock |
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263 | * If the region name is not unique, then the region identifier will match the |
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264 | * first region with that name in the search order. However, this region |
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265 | * identifier is not guaranteed to correspond to the desired region. |
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266 | * |
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267 | * The objects are searched from lowest to the highest index. Only the local |
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268 | * node is searched. |
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269 | * |
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270 | * The region identifier is used with other region related directives to access |
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271 | * the region. |
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272 | * @endparblock |
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273 | * |
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274 | * @par Constraints |
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275 | * @parblock |
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276 | * The following constraints apply to this directive: |
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277 | * |
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278 | * * The directive may be called from within any runtime context. |
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279 | * |
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280 | * * The directive will not cause the calling task to be preempted. |
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281 | * @endparblock |
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282 | */ |
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283 | rtems_status_code rtems_region_ident( rtems_name name, rtems_id *id ); |
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284 | |
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285 | /* Generated from spec:/rtems/region/if/delete */ |
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286 | |
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287 | /** |
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288 | * @ingroup RTEMSAPIClassicRegion |
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289 | * |
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290 | * @brief Deletes the region. |
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291 | * |
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292 | * @param id is the region identifier. |
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293 | * |
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294 | * This directive deletes the region specified by ``id``. |
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295 | * |
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296 | * @retval ::RTEMS_SUCCESSFUL The requested operation was successful. |
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297 | * |
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298 | * @retval ::RTEMS_INVALID_ID There was no region associated with the |
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299 | * identifier specified by ``id``. |
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300 | * |
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301 | * @retval ::RTEMS_RESOURCE_IN_USE There were segments of the region still in |
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302 | * use. |
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303 | * |
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304 | * @par Notes |
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305 | * @parblock |
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306 | * The region cannot be deleted if any of its segments are still allocated. |
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307 | * |
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308 | * The RNCB for the deleted region is reclaimed by RTEMS. |
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309 | * @endparblock |
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310 | * |
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311 | * @par Constraints |
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312 | * @parblock |
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313 | * The following constraints apply to this directive: |
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314 | * |
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315 | * * The directive may be called from within device driver initialization |
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316 | * context. |
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317 | * |
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318 | * * The directive may be called from within task context. |
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319 | * |
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320 | * * The directive may obtain and release the object allocator mutex. This may |
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321 | * cause the calling task to be preempted. |
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322 | * |
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323 | * * The calling task does not have to be the task that created the object. |
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324 | * Any local task that knows the object identifier can delete the object. |
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325 | * |
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326 | * * Where the object class corresponding to the directive is configured to use |
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327 | * unlimited objects, the directive may free memory to the RTEMS Workspace. |
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328 | * @endparblock |
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329 | */ |
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330 | rtems_status_code rtems_region_delete( rtems_id id ); |
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331 | |
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332 | /* Generated from spec:/rtems/region/if/extend */ |
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333 | |
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334 | /** |
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335 | * @ingroup RTEMSAPIClassicRegion |
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336 | * |
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337 | * @brief Extends the region. |
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338 | * |
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339 | * @param id is the region identifier. |
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340 | * |
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341 | * @param starting_address is the starting address of the memory area to extend |
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342 | * the region. |
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343 | * |
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344 | * @param length is the length in bytes of the memory area to extend the |
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345 | * region. |
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346 | * |
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347 | * This directive adds the memory area which starts at ``starting_address`` for |
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348 | * ``length`` bytes to the region specified by ``id``. |
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349 | * |
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350 | * @retval ::RTEMS_SUCCESSFUL The requested operation was successful. |
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351 | * |
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352 | * @retval ::RTEMS_INVALID_ADDRESS The ``starting_address`` parameter was NULL. |
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353 | * |
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354 | * @retval ::RTEMS_INVALID_ID There was no region associated with the |
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355 | * identifier specified by ``id``. |
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356 | * |
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357 | * @retval ::RTEMS_INVALID_ADDRESS The memory area specified by |
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358 | * ``starting_address`` and ``length`` was insufficient to extend the heap. |
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359 | * |
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360 | * @par Notes |
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361 | * There are no alignment requirements for the memory area. The memory area |
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362 | * must be big enough to contain some maintenance blocks. It must not overlap |
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363 | * parts of the current heap memory areas. Disconnected memory areas added to |
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364 | * the heap will lead to used blocks which cover the gaps. Extending with an |
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365 | * inappropriate memory area will corrupt the heap resulting in undefined |
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366 | * behaviour. |
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367 | * |
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368 | * @par Constraints |
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369 | * @parblock |
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370 | * The following constraints apply to this directive: |
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371 | * |
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372 | * * The directive may be called from within device driver initialization |
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373 | * context. |
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374 | * |
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375 | * * The directive may be called from within task context. |
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376 | * |
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377 | * * The directive may obtain and release the object allocator mutex. This may |
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378 | * cause the calling task to be preempted. |
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379 | * @endparblock |
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380 | */ |
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381 | rtems_status_code rtems_region_extend( |
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382 | rtems_id id, |
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383 | void *starting_address, |
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384 | uintptr_t length |
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385 | ); |
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386 | |
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387 | /* Generated from spec:/rtems/region/if/get-segment */ |
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388 | |
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389 | /** |
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390 | * @ingroup RTEMSAPIClassicRegion |
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391 | * |
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392 | * @brief Gets a segment from the region. |
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393 | * |
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394 | * @param id is the region identifier. |
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395 | * |
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396 | * @param size is the size in bytes of the segment to allocate. |
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397 | * |
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398 | * @param option_set is the option set. |
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399 | * |
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400 | * @param timeout is the timeout in clock ticks if the #RTEMS_WAIT option is |
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401 | * set. Use #RTEMS_NO_TIMEOUT to wait potentially forever. |
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402 | * |
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403 | * @param[out] segment is the pointer to a ``void`` pointer object. When the |
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404 | * directive call is successful, the begin address of the allocated segment |
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405 | * will be stored in this object. |
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406 | * |
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407 | * This directive gets a segment from the region specified by ``id``. |
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408 | * |
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409 | * The **option set** specified in ``option_set`` is built through a *bitwise |
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410 | * or* of the option constants described below. Not all combinations of |
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411 | * options are allowed. Some options are mutually exclusive. If mutually |
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412 | * exclusive options are combined, the behaviour is undefined. Options not |
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413 | * mentioned below are not evaluated by this directive and have no effect. |
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414 | * Default options can be selected by using the #RTEMS_DEFAULT_OPTIONS |
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415 | * constant. |
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416 | * |
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417 | * The calling task can **wait** or **try to get** a segment from the region |
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418 | * according to the mutually exclusive #RTEMS_WAIT and #RTEMS_NO_WAIT options. |
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419 | * |
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420 | * * **Waiting to get** a segment from the region is the default and can be |
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421 | * emphasized through the use of the #RTEMS_WAIT option. The ``timeout`` |
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422 | * parameter defines how long the calling task is willing to wait. Use |
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423 | * #RTEMS_NO_TIMEOUT to wait potentially forever, otherwise set a timeout |
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424 | * interval in clock ticks. |
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425 | * |
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426 | * * **Trying to get** a segment from the region is selected by the |
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427 | * #RTEMS_NO_WAIT option. If this option is defined, then the ``timeout`` |
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428 | * parameter is ignored. When a segment from the region cannot be |
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429 | * immediately allocated, then the ::RTEMS_UNSATISFIED status is returned. |
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430 | * |
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431 | * With either #RTEMS_WAIT or #RTEMS_NO_WAIT if there is a segment of the |
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432 | * requested size is available, then it is returned in ``segment`` and this |
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433 | * directive returns immediately with the ::RTEMS_SUCCESSFUL status code. |
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434 | * |
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435 | * If the calling task chooses to return immediately and the region has no |
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436 | * segment of the requested size available, then the directive returns |
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437 | * immediately with the ::RTEMS_UNSATISFIED status code. If the calling task |
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438 | * chooses to wait for a segment, then the calling task is placed on the region |
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439 | * wait queue and blocked. If the region was created with the #RTEMS_PRIORITY |
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440 | * option specified, then the calling task is inserted into the wait queue |
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441 | * according to its priority. But, if the region was created with the |
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442 | * #RTEMS_FIFO option specified, then the calling task is placed at the rear of |
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443 | * the wait queue. |
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444 | * |
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445 | * @retval ::RTEMS_SUCCESSFUL The requested operation was successful. |
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446 | * |
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447 | * @retval ::RTEMS_INVALID_ADDRESS The ``segment`` parameter was NULL. |
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448 | * |
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449 | * @retval ::RTEMS_INVALID_SIZE The ``size`` parameter was zero. |
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450 | * |
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451 | * @retval ::RTEMS_INVALID_ID There was no region associated with the |
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452 | * identifier specified by ``id``. |
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453 | * |
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454 | * @retval ::RTEMS_INVALID_SIZE The ``size`` parameter exceeded the maximum |
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455 | * segment size which is possible for the region. |
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456 | * |
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457 | * @retval ::RTEMS_UNSATISFIED The region had no segment of the requested size |
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458 | * immediately available. |
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459 | * |
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460 | * @retval ::RTEMS_TIMEOUT The timeout happened while the calling task was |
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461 | * waiting to get a segment from the region. |
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462 | * |
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463 | * @par Notes |
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464 | * The actual length of the allocated segment may be larger than the requested |
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465 | * size because a segment size is always a multiple of the region's page size. |
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466 | * |
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467 | * @par Constraints |
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468 | * @parblock |
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469 | * The following constraints apply to this directive: |
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470 | * |
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471 | * * The directive may be called from within device driver initialization |
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472 | * context. |
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473 | * |
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474 | * * The directive may be called from within task context. |
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475 | * |
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476 | * * The directive may obtain and release the object allocator mutex. This may |
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477 | * cause the calling task to be preempted. |
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478 | * |
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479 | * * When the request cannot be immediately satisfied and the #RTEMS_WAIT |
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480 | * option is set, the calling task blocks at some point during the directive |
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481 | * call. |
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482 | * |
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483 | * * The timeout functionality of the directive requires a clock tick. |
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484 | * @endparblock |
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485 | */ |
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486 | rtems_status_code rtems_region_get_segment( |
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487 | rtems_id id, |
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488 | uintptr_t size, |
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489 | rtems_option option_set, |
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490 | rtems_interval timeout, |
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491 | void **segment |
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492 | ); |
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493 | |
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494 | /* Generated from spec:/rtems/region/if/return-segment */ |
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495 | |
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496 | /** |
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497 | * @ingroup RTEMSAPIClassicRegion |
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498 | * |
---|
499 | * @brief Returns the segment to the region. |
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500 | * |
---|
501 | * @param id is the region identifier. |
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502 | * |
---|
503 | * @param segment is the begin address of the segment to return. |
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504 | * |
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505 | * This directive returns the segment specified by ``segment`` to the region |
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506 | * specified by ``id``. The returned segment is merged with its neighbors to |
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507 | * form the largest possible segment. The first task on the wait queue is |
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508 | * examined to determine if its segment request can now be satisfied. If so, |
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509 | * it is given a segment and unblocked. This process is repeated until the |
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510 | * first task's segment request cannot be satisfied. |
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511 | * |
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512 | * @retval ::RTEMS_SUCCESSFUL The requested operation was successful. |
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513 | * |
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514 | * @retval ::RTEMS_INVALID_ID There was no region associated with the |
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515 | * identifier specified by ``id``. |
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516 | * |
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517 | * @retval ::RTEMS_INVALID_ADDRESS The segment was not within the region. |
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518 | * |
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519 | * @par Notes |
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520 | * @parblock |
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521 | * This directive will cause the calling task to be preempted if one or more |
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522 | * local tasks are waiting for a segment and the following conditions exist: |
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523 | * |
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524 | * * A waiting task has a higher priority than the calling task. |
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525 | * |
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526 | * * The size of the segment required by the waiting task is less than or equal |
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527 | * to the size of the segment returned. |
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528 | * @endparblock |
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529 | * |
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530 | * @par Constraints |
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531 | * @parblock |
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532 | * The following constraints apply to this directive: |
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533 | * |
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534 | * * The directive may be called from within device driver initialization |
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535 | * context. |
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536 | * |
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537 | * * The directive may be called from within task context. |
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538 | * |
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539 | * * The directive may unblock a task. This may cause the calling task to be |
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540 | * preempted. |
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541 | * |
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542 | * * The directive may obtain and release the object allocator mutex. This may |
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543 | * cause the calling task to be preempted. |
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544 | * @endparblock |
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545 | */ |
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546 | rtems_status_code rtems_region_return_segment( rtems_id id, void *segment ); |
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547 | |
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548 | /* Generated from spec:/rtems/region/if/resize-segment */ |
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549 | |
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550 | /** |
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551 | * @ingroup RTEMSAPIClassicRegion |
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552 | * |
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553 | * @brief Changes the size of the segment. |
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554 | * |
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555 | * @param id is the region identifier. |
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556 | * |
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557 | * @param segment is the begin address of the segment to resize. |
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558 | * |
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559 | * @param size is the requested new size of the segment. |
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560 | * |
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561 | * @param[out] old_size is the pointer to an uintptr_t object. When the |
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562 | * directive call is successful, the old size of the segment will be stored |
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563 | * in this object. |
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564 | * |
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565 | * This directive is used to increase or decrease the size of the ``segment`` |
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566 | * of the region specified by ``id``. When increasing the size of a segment, |
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567 | * it is possible that there is no memory available contiguous to the segment. |
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568 | * In this case, the request is unsatisfied. |
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569 | * |
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570 | * @retval ::RTEMS_SUCCESSFUL The requested operation was successful. |
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571 | * |
---|
572 | * @retval ::RTEMS_INVALID_ADDRESS The ``old_size`` parameter was NULL. |
---|
573 | * |
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574 | * @retval ::RTEMS_INVALID_ID There was no region associated with the |
---|
575 | * identifier specified by ``id``. |
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576 | * |
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577 | * @retval ::RTEMS_INVALID_ADDRESS The segment was not within the region. |
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578 | * |
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579 | * @retval ::RTEMS_UNSATISFIED The region was unable to resize the segment. |
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580 | * |
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581 | * @par Notes |
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582 | * If an attempt to increase the size of a segment fails, then the application |
---|
583 | * may want to allocate a new segment of the desired size, copy the contents of |
---|
584 | * the original segment to the new, larger segment and then return the original |
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585 | * segment. |
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586 | * |
---|
587 | * @par Constraints |
---|
588 | * @parblock |
---|
589 | * The following constraints apply to this directive: |
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590 | * |
---|
591 | * * The directive may be called from within device driver initialization |
---|
592 | * context. |
---|
593 | * |
---|
594 | * * The directive may be called from within task context. |
---|
595 | * |
---|
596 | * * The directive may obtain and release the object allocator mutex. This may |
---|
597 | * cause the calling task to be preempted. |
---|
598 | * @endparblock |
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599 | */ |
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600 | rtems_status_code rtems_region_resize_segment( |
---|
601 | rtems_id id, |
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602 | void *segment, |
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603 | uintptr_t size, |
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604 | uintptr_t *old_size |
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605 | ); |
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606 | |
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607 | /* Generated from spec:/rtems/region/if/get-information */ |
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608 | |
---|
609 | /** |
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610 | * @ingroup RTEMSAPIClassicRegion |
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611 | * |
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612 | * @brief Gets the region information. |
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613 | * |
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614 | * @param id is the region identifier. |
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615 | * |
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616 | * @param[out] the_info is the pointer to a Heap_Information_block object. |
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617 | * When the directive call is successful, the information of the region will |
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618 | * be stored in this object. |
---|
619 | * |
---|
620 | * This directive is used to obtain information about the used and free memory |
---|
621 | * in the region specified by ``id``. This is a snapshot at the time of the |
---|
622 | * call. The information will be returned in the structure pointed to by |
---|
623 | * ``the_info``. |
---|
624 | * |
---|
625 | * @retval ::RTEMS_SUCCESSFUL The requested operation was successful. |
---|
626 | * |
---|
627 | * @retval ::RTEMS_INVALID_ADDRESS The ``the_info`` parameter was NULL. |
---|
628 | * |
---|
629 | * @retval ::RTEMS_INVALID_ID There was no region associated with the |
---|
630 | * identifier specified by ``id``. |
---|
631 | * |
---|
632 | * @par Notes |
---|
633 | * @parblock |
---|
634 | * This is primarily intended as a mechanism to obtain a diagnostic |
---|
635 | * information. This method forms am O(n) scan of the free and an O(n) scan of |
---|
636 | * the used blocks in the region to calculate the information provided. Given |
---|
637 | * that the execution time is driven by the number of used and free blocks, it |
---|
638 | * can take a non-deterministic time to execute. |
---|
639 | * |
---|
640 | * To get only the free information of the region use |
---|
641 | * rtems_region_get_free_information(). |
---|
642 | * @endparblock |
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643 | * |
---|
644 | * @par Constraints |
---|
645 | * @parblock |
---|
646 | * The following constraints apply to this directive: |
---|
647 | * |
---|
648 | * * The directive may be called from within device driver initialization |
---|
649 | * context. |
---|
650 | * |
---|
651 | * * The directive may be called from within task context. |
---|
652 | * |
---|
653 | * * The directive may obtain and release the object allocator mutex. This may |
---|
654 | * cause the calling task to be preempted. |
---|
655 | * @endparblock |
---|
656 | */ |
---|
657 | rtems_status_code rtems_region_get_information( |
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658 | rtems_id id, |
---|
659 | Heap_Information_block *the_info |
---|
660 | ); |
---|
661 | |
---|
662 | /* Generated from spec:/rtems/region/if/get-free-information */ |
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663 | |
---|
664 | /** |
---|
665 | * @ingroup RTEMSAPIClassicRegion |
---|
666 | * |
---|
667 | * @brief Gets the region free information. |
---|
668 | * |
---|
669 | * @param id is the region identifier. |
---|
670 | * |
---|
671 | * @param[out] the_info is the pointer to a Heap_Information_block object. |
---|
672 | * When the directive call is successful, the free information of the region |
---|
673 | * will be stored in this object. |
---|
674 | * |
---|
675 | * This directive is used to obtain information about the free memory in the |
---|
676 | * region specified by ``id``. This is a snapshot at the time of the call. The |
---|
677 | * information will be returned in the structure pointed to by ``the_info``. |
---|
678 | * |
---|
679 | * @retval ::RTEMS_SUCCESSFUL The requested operation was successful. |
---|
680 | * |
---|
681 | * @retval ::RTEMS_INVALID_ADDRESS The ``the_info`` parameter was NULL. |
---|
682 | * |
---|
683 | * @retval ::RTEMS_INVALID_ID There was no region associated with the |
---|
684 | * identifier specified by ``id``. |
---|
685 | * |
---|
686 | * @par Notes |
---|
687 | * @parblock |
---|
688 | * This directive uses the same structure to return information as the |
---|
689 | * rtems_region_get_information() directive but does not fill in the used |
---|
690 | * information. |
---|
691 | * |
---|
692 | * This is primarily intended as a mechanism to obtain a diagnostic |
---|
693 | * information. This method forms am O(n) scan of the free in the region to |
---|
694 | * calculate the information provided. Given that the execution time is driven |
---|
695 | * by the number of used and free blocks, it can take a non-deterministic time |
---|
696 | * to execute. Typically, there are many used blocks and a much smaller number |
---|
697 | * of used blocks making a call to this directive less expensive than a call to |
---|
698 | * rtems_region_get_information(). |
---|
699 | * @endparblock |
---|
700 | * |
---|
701 | * @par Constraints |
---|
702 | * @parblock |
---|
703 | * The following constraints apply to this directive: |
---|
704 | * |
---|
705 | * * The directive may be called from within device driver initialization |
---|
706 | * context. |
---|
707 | * |
---|
708 | * * The directive may be called from within task context. |
---|
709 | * |
---|
710 | * * The directive may obtain and release the object allocator mutex. This may |
---|
711 | * cause the calling task to be preempted. |
---|
712 | * @endparblock |
---|
713 | */ |
---|
714 | rtems_status_code rtems_region_get_free_information( |
---|
715 | rtems_id id, |
---|
716 | Heap_Information_block *the_info |
---|
717 | ); |
---|
718 | |
---|
719 | #ifdef __cplusplus |
---|
720 | } |
---|
721 | #endif |
---|
722 | |
---|
723 | #endif /* _RTEMS_RTEMS_REGION_H */ |
---|