1 | /* |
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2 | * $Id$ |
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3 | */ |
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4 | |
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5 | #include <errno.h> |
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6 | #include <limits.h> |
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7 | #include <pthread.h> |
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8 | #include <string.h> |
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9 | |
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10 | #include <rtems/system.h> |
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11 | #include <rtems/score/thread.h> |
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12 | #include <rtems/score/wkspace.h> |
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13 | #include <rtems/posix/key.h> |
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14 | |
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15 | /* |
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16 | * _POSIX_Key_Manager_initialization |
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17 | * |
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18 | * DESCRIPTION: |
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19 | * |
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20 | * This routine performs the initialization necessary for this manager. |
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21 | */ |
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22 | |
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23 | void _POSIX_Key_Manager_initialization( |
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24 | unsigned32 maximum_keys |
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25 | ) |
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26 | { |
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27 | _Objects_Initialize_information( |
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28 | &_POSIX_Keys_Information, |
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29 | OBJECTS_POSIX_KEYS, |
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30 | FALSE, |
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31 | maximum_keys, |
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32 | sizeof( POSIX_Keys_Control ), |
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33 | FALSE, |
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34 | 0, |
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35 | FALSE |
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36 | ); |
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37 | } |
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38 | |
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39 | /*PAGE |
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40 | * |
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41 | * 17.1.1 Thread-Specific Data Key Create, P1003.1c/Draft 10, p. 163 |
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42 | */ |
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43 | |
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44 | int pthread_key_create( |
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45 | pthread_key_t *key, |
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46 | void (*destructor)( void * ) |
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47 | ) |
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48 | { |
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49 | POSIX_Keys_Control *the_key; |
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50 | void *table; |
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51 | unsigned32 the_class; |
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52 | unsigned32 bytes_to_allocate; |
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53 | |
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54 | |
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55 | _Thread_Disable_dispatch(); |
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56 | |
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57 | the_key = _POSIX_Keys_Allocate(); |
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58 | |
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59 | if ( !the_key ) { |
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60 | _Thread_Enable_dispatch(); |
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61 | return EAGAIN; |
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62 | } |
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63 | |
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64 | the_key->destructor = destructor; |
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65 | |
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66 | for ( the_class = OBJECTS_CLASSES_FIRST_THREAD_CLASS; |
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67 | the_class <= OBJECTS_CLASSES_LAST_THREAD_CLASS; |
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68 | the_class++ ) { |
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69 | |
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70 | bytes_to_allocate = |
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71 | (_Objects_Information_table[ the_class ]->maximum + 1) * sizeof( void * ); |
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72 | |
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73 | table = _Workspace_Allocate( bytes_to_allocate ); |
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74 | |
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75 | if ( !table ) { |
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76 | for ( --the_class; |
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77 | the_class >= OBJECTS_CLASSES_FIRST_THREAD_CLASS; |
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78 | the_class-- ) |
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79 | _Workspace_Free( the_key->Values[ the_class ] ); |
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80 | |
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81 | _POSIX_Keys_Free( the_key ); |
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82 | _Thread_Enable_dispatch(); |
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83 | return ENOMEM; |
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84 | } |
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85 | |
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86 | the_key->Values[ the_class ] = table; |
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87 | memset( table, '\0', bytes_to_allocate ); |
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88 | } |
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89 | |
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90 | the_key->is_active = TRUE; |
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91 | |
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92 | _Objects_Open( &_POSIX_Keys_Information, &the_key->Object, 0 ); |
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93 | |
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94 | *key = the_key->Object.id; |
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95 | |
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96 | _Thread_Enable_dispatch(); |
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97 | |
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98 | return 0; |
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99 | } |
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100 | |
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101 | /*PAGE |
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102 | * |
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103 | * 17.1.2 Thread-Specific Data Management, P1003.1c/Draft 10, p. 165 |
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104 | */ |
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105 | |
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106 | int pthread_setspecific( |
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107 | pthread_key_t key, |
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108 | const void *value |
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109 | ) |
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110 | { |
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111 | register POSIX_Keys_Control *the_key; |
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112 | unsigned32 index; |
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113 | unsigned32 class; |
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114 | Objects_Locations location; |
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115 | |
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116 | the_key = _POSIX_Keys_Get( key, &location ); |
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117 | switch ( location ) { |
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118 | case OBJECTS_ERROR: |
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119 | case OBJECTS_REMOTE: /* should never happen */ |
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120 | return EINVAL; |
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121 | case OBJECTS_LOCAL: |
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122 | index = _Objects_Get_index( _Thread_Executing->Object.id ); |
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123 | class = _Objects_Get_class( _Thread_Executing->Object.id ); |
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124 | the_key->Values[ class ][ index ] = (void *) value; |
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125 | _Thread_Enable_dispatch(); |
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126 | return 0; |
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127 | } |
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128 | return POSIX_BOTTOM_REACHED(); |
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129 | } |
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130 | |
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131 | /*PAGE |
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132 | * |
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133 | * 17.1.2 Thread-Specific Data Management, P1003.1c/Draft 10, p. 165 |
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134 | */ |
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135 | |
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136 | void *pthread_getspecific( |
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137 | pthread_key_t key |
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138 | ) |
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139 | { |
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140 | register POSIX_Keys_Control *the_key; |
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141 | unsigned32 index; |
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142 | unsigned32 class; |
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143 | Objects_Locations location; |
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144 | void *key_data; |
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145 | |
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146 | the_key = _POSIX_Keys_Get( key, &location ); |
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147 | switch ( location ) { |
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148 | case OBJECTS_ERROR: |
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149 | case OBJECTS_REMOTE: /* should never happen */ |
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150 | return NULL; |
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151 | case OBJECTS_LOCAL: |
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152 | index = _Objects_Get_index( _Thread_Executing->Object.id ); |
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153 | class = _Objects_Get_class( _Thread_Executing->Object.id ); |
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154 | key_data = (void *) the_key->Values[ class ][ index ]; |
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155 | _Thread_Enable_dispatch(); |
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156 | return key_data; |
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157 | } |
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158 | return (void *) POSIX_BOTTOM_REACHED(); |
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159 | } |
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160 | |
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161 | /*PAGE |
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162 | * |
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163 | * 17.1.3 Thread-Specific Data Key Deletion, P1003.1c/Draft 10, p. 167 |
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164 | */ |
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165 | |
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166 | int pthread_key_delete( |
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167 | pthread_key_t key |
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168 | ) |
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169 | { |
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170 | register POSIX_Keys_Control *the_key; |
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171 | Objects_Locations location; |
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172 | unsigned32 the_class; |
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173 | |
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174 | the_key = _POSIX_Keys_Get( key, &location ); |
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175 | switch ( location ) { |
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176 | case OBJECTS_ERROR: |
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177 | case OBJECTS_REMOTE: /* should never happen */ |
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178 | return EINVAL; |
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179 | case OBJECTS_LOCAL: |
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180 | _Objects_Close( &_POSIX_Keys_Information, &the_key->Object ); |
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181 | |
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182 | the_key->is_active = FALSE; |
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183 | |
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184 | for ( the_class = OBJECTS_CLASSES_FIRST_THREAD_CLASS; |
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185 | the_class <= OBJECTS_CLASSES_LAST_THREAD_CLASS; |
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186 | the_class++ ) |
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187 | _Workspace_Free( the_key->Values[ the_class ] ); |
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188 | |
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189 | /* |
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190 | * NOTE: The destructor is not called and it is the responsibility |
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191 | * of the application to free the memory. |
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192 | */ |
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193 | |
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194 | _POSIX_Keys_Free( the_key ); |
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195 | _Thread_Enable_dispatch(); |
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196 | return 0; |
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197 | } |
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198 | return POSIX_BOTTOM_REACHED(); |
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199 | } |
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200 | |
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201 | /*PAGE |
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202 | * |
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203 | * _POSIX_Keys_Run_destructors |
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204 | * |
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205 | * 17.1.1 Thread-Specific Data Key Create, P1003.1c/Draft 10, p. 163 |
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206 | * |
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207 | * NOTE: This is the routine executed when a thread exits to |
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208 | * run through all the keys and do the destructor action. |
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209 | */ |
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210 | |
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211 | void _POSIX_Keys_Run_destructors( |
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212 | Thread_Control *thread |
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213 | ) |
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214 | { |
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215 | unsigned32 index; |
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216 | unsigned32 pthread_index; |
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217 | unsigned32 pthread_class; |
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218 | unsigned32 iterations; |
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219 | boolean are_all_null; |
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220 | POSIX_Keys_Control *the_key; |
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221 | void *value; |
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222 | |
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223 | pthread_index = _Objects_Get_index( thread->Object.id ); |
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224 | pthread_class = _Objects_Get_class( thread->Object.id ); |
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225 | |
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226 | iterations = 0; |
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227 | |
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228 | for ( ; ; ) { |
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229 | |
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230 | are_all_null = TRUE; |
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231 | |
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232 | for ( index=1 ; index <= _POSIX_Keys_Information.maximum ; index++ ) { |
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233 | |
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234 | the_key = (POSIX_Keys_Control *) |
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235 | _POSIX_Keys_Information.local_table[ index ]; |
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236 | |
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237 | if ( the_key && the_key->is_active && the_key->destructor ) { |
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238 | value = the_key->Values[ pthread_class ][ pthread_index ]; |
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239 | if ( value ) { |
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240 | (*the_key->destructor)( value ); |
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241 | if ( the_key->Values[ pthread_class ][ pthread_index ] ) |
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242 | are_all_null = FALSE; |
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243 | } |
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244 | } |
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245 | } |
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246 | |
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247 | if ( are_all_null == TRUE ) |
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248 | return; |
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249 | |
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250 | iterations++; |
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251 | |
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252 | /* |
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253 | * The standard allows one to not do this and thus go into an infinite |
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254 | * loop. It seems rude to unnecessarily lock up a system. |
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255 | * |
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256 | * Reference: 17.1.1.2 P1003.1c/Draft 10, p. 163, line 99. |
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257 | */ |
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258 | |
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259 | if ( iterations >= PTHREAD_DESTRUCTOR_ITERATIONS ) |
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260 | return; |
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261 | } |
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262 | } |
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