1 | /* |
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2 | * Multiprocessing Support for the Thread 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/score/priority.h> |
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18 | #include <rtems/score/thread.h> |
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19 | #include <rtems/score/wkspace.h> |
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20 | #include <rtems/score/isr.h> |
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21 | |
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22 | /*PAGE |
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23 | * |
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24 | * _Thread_MP_Handler_initialization |
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25 | * |
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26 | */ |
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27 | |
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28 | void _Thread_MP_Handler_initialization ( |
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29 | unsigned32 maximum_proxies |
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30 | ) |
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31 | { |
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32 | |
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33 | _Chain_Initialize_empty( &_Thread_MP_Active_proxies ); |
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34 | |
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35 | if ( maximum_proxies == 0 ) { |
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36 | _Chain_Initialize_empty( &_Thread_MP_Inactive_proxies ); |
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37 | return; |
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38 | } |
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39 | |
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40 | |
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41 | _Chain_Initialize( |
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42 | &_Thread_MP_Inactive_proxies, |
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43 | _Workspace_Allocate_or_fatal_error( |
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44 | maximum_proxies * sizeof( Thread_Proxy_control ) |
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45 | ), |
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46 | maximum_proxies, |
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47 | sizeof( Thread_Proxy_control ) |
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48 | ); |
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49 | |
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50 | } |
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51 | |
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52 | /*PAGE |
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53 | * |
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54 | * _Thread_MP_Allocate_proxy |
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55 | * |
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56 | */ |
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57 | |
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58 | Thread_Control *_Thread_MP_Allocate_proxy ( |
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59 | States_Control the_state |
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60 | ) |
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61 | { |
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62 | Thread_Control *the_thread; |
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63 | Thread_Proxy_control *the_proxy; |
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64 | |
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65 | the_thread = (Thread_Control *)_Chain_Get( &_Thread_MP_Inactive_proxies ); |
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66 | |
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67 | if ( !_Thread_Is_null( the_thread ) ) { |
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68 | |
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69 | the_proxy = (Thread_Proxy_control *) the_thread; |
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70 | |
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71 | _Thread_Executing->Wait.return_code = THREAD_STATUS_PROXY_BLOCKING; |
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72 | |
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73 | the_proxy->receive_packet = _Thread_MP_Receive->receive_packet; |
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74 | |
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75 | the_proxy->Object.id = _Thread_MP_Receive->receive_packet->source_tid; |
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76 | |
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77 | the_proxy->current_priority = |
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78 | _Thread_MP_Receive->receive_packet->source_priority; |
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79 | |
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80 | the_proxy->current_state = _States_Set( STATES_DORMANT, the_state ); |
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81 | |
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82 | the_proxy->Wait = _Thread_Executing->Wait; |
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83 | |
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84 | _Chain_Append( &_Thread_MP_Active_proxies, &the_proxy->Active ); |
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85 | |
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86 | return the_thread; |
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87 | } |
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88 | |
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89 | _Internal_error_Occurred( |
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90 | INTERNAL_ERROR_CORE, |
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91 | TRUE, |
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92 | INTERNAL_ERROR_OUT_OF_PROXIES |
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93 | ); |
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94 | |
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95 | /* |
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96 | * NOTE: The following return insures that the compiler will |
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97 | * think that all paths return a value. |
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98 | */ |
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99 | |
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100 | return NULL; |
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101 | } |
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102 | |
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103 | /*PAGE |
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104 | * |
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105 | * _Thread_MP_Find_proxy |
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106 | * |
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107 | */ |
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108 | |
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109 | /* |
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110 | * The following macro provides the offset of the Active element |
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111 | * in the Thread_Proxy_control structure. This is the logical |
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112 | * equivalent of the POSITION attribute in Ada. |
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113 | */ |
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114 | |
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115 | #define _Thread_MP_Proxy_Active_offset \ |
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116 | ((unsigned32)&(((Thread_Proxy_control *)0))->Active) |
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117 | |
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118 | Thread_Control *_Thread_MP_Find_proxy ( |
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119 | Objects_Id the_id |
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120 | ) |
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121 | { |
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122 | |
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123 | Chain_Node *proxy_node; |
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124 | Thread_Control *the_thread; |
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125 | ISR_Level level; |
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126 | |
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127 | restart: |
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128 | |
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129 | _ISR_Disable( level ); |
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130 | |
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131 | for ( proxy_node = _Thread_MP_Active_proxies.first; |
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132 | !_Chain_Is_tail( &_Thread_MP_Active_proxies, proxy_node ) ; |
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133 | ) { |
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134 | |
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135 | the_thread = _Addresses_Subtract_offset( |
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136 | proxy_node, |
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137 | _Thread_MP_Proxy_Active_offset |
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138 | ); |
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139 | |
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140 | if ( _Objects_Are_ids_equal( the_thread->Object.id, the_id ) ) { |
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141 | _ISR_Enable( level ); |
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142 | return the_thread; |
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143 | } |
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144 | |
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145 | _ISR_Flash( level ); |
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146 | |
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147 | proxy_node = proxy_node->next; |
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148 | |
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149 | /* |
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150 | * A proxy which is only dormant is not in a blocking state. |
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151 | * Therefore, we are looking at proxy which has been moved from |
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152 | * active to inactive chain (by an ISR) and need to restart |
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153 | * the search. |
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154 | */ |
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155 | |
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156 | if ( _States_Is_only_dormant( the_thread->current_state ) ) { |
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157 | _ISR_Enable( level ); |
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158 | goto restart; |
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159 | } |
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160 | } |
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161 | |
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162 | _ISR_Enable( level ); |
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163 | return NULL; |
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164 | } |
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