1 | /* |
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2 | * Object Handler |
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3 | * |
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4 | * |
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5 | * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. |
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6 | * On-Line Applications Research Corporation (OAR). |
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7 | * All rights assigned to U.S. Government, 1994. |
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8 | * |
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9 | * This material may be reproduced by or for the U.S. Government pursuant |
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10 | * to the copyright license under the clause at DFARS 252.227-7013. This |
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11 | * notice must appear in all copies of this file and its derivatives. |
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12 | * |
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13 | * $Id$ |
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14 | */ |
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15 | |
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16 | #include <rtems/system.h> |
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17 | #include <rtems/chain.h> |
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18 | #include <rtems/config.h> |
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19 | #include <rtems/object.h> |
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20 | #include <rtems/objectmp.h> |
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21 | #include <rtems/thread.h> |
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22 | #include <rtems/wkspace.h> |
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23 | |
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24 | /*PAGE |
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25 | * |
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26 | * _Objects_Handler_initialization |
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27 | * |
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28 | * This routine initializes the object handler. |
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29 | * |
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30 | * Input parameters: |
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31 | * node - local node |
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32 | * maximum_global_objects - number of configured global objects |
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33 | * |
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34 | * Output parameters: NONE |
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35 | */ |
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36 | |
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37 | void _Objects_Handler_initialization( |
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38 | unsigned32 node, |
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39 | unsigned32 maximum_global_objects |
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40 | ) |
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41 | { |
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42 | _Objects_Local_node = node; |
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43 | |
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44 | _Objects_MP_Handler_initialization( maximum_global_objects ); |
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45 | } |
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46 | |
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47 | /*PAGE |
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48 | * |
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49 | * _Objects_Initialize_information |
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50 | * |
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51 | * This routine initializes all object information related data structures. |
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52 | * |
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53 | * Input parameters: |
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54 | * information - object information table |
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55 | * the_class - object class |
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56 | * supports_global - TRUE if this is a global object class |
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57 | * maximum - maximum objects of this class |
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58 | * size - size of this object's control block |
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59 | * |
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60 | * Output parameters: NONE |
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61 | */ |
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62 | |
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63 | void _Objects_Initialize_information( |
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64 | Objects_Information *information, |
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65 | Objects_Classes the_class, |
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66 | boolean supports_global, |
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67 | unsigned32 maximum, |
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68 | unsigned32 size |
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69 | ) |
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70 | { |
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71 | unsigned32 minimum_index; |
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72 | unsigned32 index; |
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73 | Objects_Control *the_object; |
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74 | |
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75 | information->maximum = maximum; |
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76 | information->the_class = the_class; |
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77 | |
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78 | if ( maximum == 0 ) minimum_index = 0; |
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79 | else minimum_index = 1; |
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80 | |
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81 | information->minimum_id = |
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82 | _Objects_Build_id( the_class, _Objects_Local_node, minimum_index ); |
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83 | |
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84 | information->maximum_id = |
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85 | _Objects_Build_id( the_class, _Objects_Local_node, maximum ); |
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86 | |
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87 | information->local_table = _Workspace_Allocate_or_fatal_error( |
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88 | (maximum + 1) * sizeof(Objects_Control *) |
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89 | ); |
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90 | |
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91 | information->name_table = _Workspace_Allocate_or_fatal_error( |
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92 | (maximum + 1) * sizeof(Objects_Name) |
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93 | ); |
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94 | |
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95 | for ( index=0 ; index < maximum ; index++ ) { |
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96 | information->local_table[ index ] = NULL; |
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97 | information->name_table[ index ] = 0; |
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98 | } |
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99 | |
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100 | if ( maximum == 0 ) { |
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101 | _Chain_Initialize_empty( &information->Inactive ); |
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102 | } else { |
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103 | |
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104 | |
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105 | _Chain_Initialize( |
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106 | &information->Inactive, |
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107 | _Workspace_Allocate_or_fatal_error( maximum * size ), |
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108 | maximum, |
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109 | size |
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110 | ); |
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111 | |
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112 | the_object = (Objects_Control *) information->Inactive.first; |
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113 | for ( index=1; |
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114 | index <= maximum ; |
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115 | index++ ) { |
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116 | the_object->id = |
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117 | _Objects_Build_id( the_class, _Objects_Local_node, index ); |
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118 | the_object = (Objects_Control *) the_object->Node.next; |
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119 | } |
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120 | |
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121 | } |
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122 | |
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123 | if ( supports_global == TRUE && _Configuration_Is_multiprocessing() ) { |
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124 | |
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125 | information->global_table = _Workspace_Allocate_or_fatal_error( |
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126 | (_Configuration_MP_table->maximum_nodes + 1) * sizeof(Chain_Control) |
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127 | ); |
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128 | |
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129 | for ( index=1; |
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130 | index <= _Configuration_MP_table->maximum_nodes ; |
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131 | index++ ) |
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132 | _Chain_Initialize_empty( &information->global_table[ index ] ); |
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133 | } |
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134 | else |
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135 | information->global_table = NULL; |
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136 | } |
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137 | |
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138 | /*PAGE |
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139 | * |
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140 | * _Objects_Name_to_id |
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141 | * |
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142 | * These kernel routines search the object table(s) for the given |
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143 | * object name and returns the associated object id. |
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144 | * |
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145 | * Input parameters: |
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146 | * information - object information |
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147 | * name - user defined object name |
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148 | * node - node indentifier (0 indicates any node) |
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149 | * id - address of return ID |
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150 | * |
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151 | * Output parameters: |
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152 | * obj_id - object id |
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153 | * RTEMS_SUCCESSFUL - if successful |
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154 | * error code - if unsuccessful |
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155 | */ |
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156 | |
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157 | rtems_status_code _Objects_Name_to_id( |
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158 | Objects_Information *information, |
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159 | Objects_Name name, |
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160 | unsigned32 node, |
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161 | Objects_Id *id |
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162 | ) |
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163 | { |
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164 | boolean search_local_node; |
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165 | Objects_Control **objects; |
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166 | Objects_Control *the_object; |
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167 | unsigned32 index; |
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168 | |
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169 | if ( name == 0 ) |
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170 | return( RTEMS_INVALID_NAME ); |
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171 | |
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172 | search_local_node = FALSE; |
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173 | |
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174 | if ( information->maximum != 0 && |
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175 | (node == RTEMS_SEARCH_ALL_NODES || node == RTEMS_SEARCH_LOCAL_NODE || |
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176 | _Objects_Is_local_node( node ) ) ) |
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177 | search_local_node = TRUE; |
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178 | |
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179 | if ( search_local_node ) { |
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180 | objects = information->local_table; |
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181 | |
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182 | for ( index = 1; index <= information->maximum; index++ ) { |
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183 | |
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184 | the_object = objects[ index ]; |
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185 | |
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186 | if ( !the_object || !the_object->name ) |
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187 | continue; |
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188 | |
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189 | if ( name == *the_object->name ) { |
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190 | *id = the_object->id; |
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191 | return( RTEMS_SUCCESSFUL ); |
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192 | } |
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193 | } |
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194 | } |
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195 | |
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196 | if ( _Objects_Is_local_node( node ) || node == RTEMS_SEARCH_LOCAL_NODE ) |
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197 | return( RTEMS_INVALID_NAME ); |
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198 | |
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199 | return ( _Objects_MP_Global_name_search( information, name, node, id ) ); |
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200 | } |
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201 | |
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202 | /*PAGE |
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203 | * |
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204 | * _Objects_Get |
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205 | * |
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206 | * This routine sets the object pointer for the given |
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207 | * object id based on the given object information structure. |
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208 | * |
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209 | * Input parameters: |
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210 | * information - pointer to entry in table for this class |
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211 | * id - object id to search for |
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212 | * location - address of where to store the location |
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213 | * |
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214 | * Output parameters: |
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215 | * returns - address of object if local |
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216 | * location - one of the following: |
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217 | * OBJECTS_ERROR - invalid object ID |
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218 | * OBJECTS_REMOTE - remote object |
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219 | * OBJECTS_LOCAL - local object |
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220 | */ |
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221 | |
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222 | Objects_Control *_Objects_Get( |
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223 | Objects_Information *information, |
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224 | Objects_Id id, |
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225 | Objects_Locations *location |
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226 | ) |
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227 | { |
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228 | Objects_Control *the_object; |
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229 | unsigned32 index; |
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230 | |
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231 | index = id - information->minimum_id; |
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232 | |
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233 | if ( information->maximum >= index ) { |
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234 | _Thread_Disable_dispatch(); |
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235 | if ( (the_object = information->local_table[index+1]) != NULL ) { |
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236 | *location = OBJECTS_LOCAL; |
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237 | return( the_object ); |
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238 | } |
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239 | _Thread_Enable_dispatch(); |
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240 | *location = OBJECTS_ERROR; |
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241 | return( NULL ); |
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242 | } |
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243 | *location = OBJECTS_ERROR; |
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244 | _Objects_MP_Is_remote( information, id, location, &the_object ); |
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245 | return the_object; |
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246 | } |
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247 | |
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248 | |
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249 | /*PAGE |
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250 | * |
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251 | * _Objects_Get_next |
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252 | * |
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253 | * Like _Objects_Get, but considers the 'id' as a "hint" and |
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254 | * finds next valid one after that point. |
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255 | * Mostly used for monitor and debug traversal of an object. |
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256 | * |
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257 | * Input parameters: |
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258 | * information - pointer to entry in table for this class |
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259 | * id - object id to search for |
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260 | * location - address of where to store the location |
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261 | * next_id - address to store next id to try |
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262 | * |
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263 | * Output parameters: |
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264 | * returns - address of object if local |
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265 | * location - one of the following: |
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266 | * OBJECTS_ERROR - invalid object ID |
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267 | * OBJECTS_REMOTE - remote object |
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268 | * OBJECTS_LOCAL - local object |
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269 | * next_id - will contain a reasonable "next" id to continue traversal |
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270 | * |
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271 | * NOTE: |
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272 | * assumes can add '1' to an id to get to next index. |
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273 | */ |
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274 | |
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275 | Objects_Control * |
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276 | _Objects_Get_next( |
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277 | Objects_Information *information, |
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278 | Objects_Id id, |
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279 | unsigned32 *location_p, |
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280 | Objects_Id *next_id_p |
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281 | ) |
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282 | { |
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283 | Objects_Control *object; |
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284 | Objects_Id next_id; |
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285 | |
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286 | if (rtems_get_index(id) == RTEMS_OBJECT_ID_INITIAL_INDEX) |
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287 | next_id = information->minimum_id; |
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288 | else |
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289 | next_id = id; |
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290 | |
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291 | do { |
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292 | /* walked off end of list? */ |
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293 | if (rtems_get_index(next_id) > information->maximum) |
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294 | { |
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295 | *location_p = OBJECTS_ERROR; |
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296 | goto final; |
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297 | } |
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298 | |
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299 | /* try to grab one */ |
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300 | object = _Objects_Get(information, next_id, location_p); |
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301 | |
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302 | next_id++; |
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303 | |
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304 | } while (*location_p != OBJECTS_LOCAL); |
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305 | |
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306 | *next_id_p = next_id; |
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307 | return object; |
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308 | |
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309 | final: |
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310 | *next_id_p = RTEMS_OBJECT_ID_FINAL; |
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311 | return 0; |
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312 | } |
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