1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Distributed MP Support |
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5 | * @ingroup ScoreThreadMP |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2006. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.org/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <rtems/score/threadimpl.h> |
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22 | #include <rtems/score/isrlock.h> |
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23 | #include <rtems/score/schedulerimpl.h> |
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24 | #include <rtems/score/wkspace.h> |
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25 | |
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26 | #include <string.h> |
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27 | |
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28 | static RBTREE_DEFINE_EMPTY( _Thread_MP_Active_proxies ); |
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29 | |
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30 | static CHAIN_DEFINE_EMPTY( _Thread_MP_Inactive_proxies ); |
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31 | |
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32 | ISR_LOCK_DEFINE( static, _Thread_MP_Proxies_lock, "Thread MP Proxies" ) |
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33 | |
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34 | static void _Thread_MP_Proxies_acquire( ISR_lock_Context *lock_context ) |
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35 | { |
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36 | _ISR_lock_ISR_disable_and_acquire( &_Thread_MP_Proxies_lock, lock_context ); |
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37 | } |
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38 | |
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39 | static void _Thread_MP_Proxies_release( ISR_lock_Context *lock_context ) |
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40 | { |
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41 | _ISR_lock_Release_and_ISR_enable( &_Thread_MP_Proxies_lock, lock_context ); |
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42 | } |
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43 | |
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44 | void _Thread_MP_Handler_initialization ( |
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45 | uint32_t maximum_proxies |
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46 | ) |
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47 | { |
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48 | size_t proxy_size; |
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49 | size_t alloc_size; |
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50 | char *proxies; |
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51 | uint32_t i; |
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52 | |
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53 | if ( maximum_proxies == 0 ) { |
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54 | return; |
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55 | } |
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56 | |
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57 | proxy_size = sizeof( Thread_Proxy_control ) |
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58 | + THREAD_QUEUE_HEADS_SIZE( _Scheduler_Count ); |
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59 | alloc_size = maximum_proxies * proxy_size; |
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60 | proxies = _Workspace_Allocate_or_fatal_error( alloc_size ); |
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61 | memset( proxies, 0, alloc_size ); |
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62 | |
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63 | _Chain_Initialize( |
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64 | &_Thread_MP_Inactive_proxies, |
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65 | proxies, |
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66 | maximum_proxies, |
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67 | proxy_size |
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68 | ); |
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69 | |
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70 | for ( i = 0 ; i < maximum_proxies ; ++i ) { |
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71 | Thread_Proxy_control *proxy; |
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72 | |
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73 | proxy = (Thread_Proxy_control *) ( proxies + i * proxy_size ); |
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74 | |
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75 | _Thread_Timer_initialize( &proxy->Timer, _Per_CPU_Get_by_index( 0 ) ); |
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76 | _RBTree_Initialize_node( &proxy->Active ); |
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77 | |
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78 | proxy->Scheduler.nodes = &proxy->Scheduler_node; |
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79 | _Scheduler_Node_do_initialize( |
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80 | &_Scheduler_Table[ 0 ], |
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81 | &proxy->Scheduler_node, |
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82 | (Thread_Control *) proxy, |
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83 | 0 |
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84 | ); |
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85 | |
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86 | proxy->Wait.spare_heads = &proxy->Thread_queue_heads[ 0 ]; |
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87 | _Thread_queue_Heads_initialize( proxy->Wait.spare_heads ); |
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88 | } |
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89 | } |
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90 | |
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91 | #define THREAD_MP_PROXY_OF_ACTIVE_NODE( the_node ) \ |
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92 | RTEMS_CONTAINER_OF( the_node, Thread_Proxy_control, Active ) |
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93 | |
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94 | static bool _Thread_MP_Proxy_equal( |
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95 | const void *left, |
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96 | const RBTree_Node *right |
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97 | ) |
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98 | { |
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99 | const Objects_Id *the_left; |
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100 | const Thread_Proxy_control *the_right; |
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101 | |
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102 | the_left = left; |
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103 | the_right = THREAD_MP_PROXY_OF_ACTIVE_NODE( right ); |
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104 | |
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105 | return *the_left == the_right->Object.id; |
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106 | } |
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107 | |
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108 | static bool _Thread_MP_Proxy_less( |
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109 | const void *left, |
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110 | const RBTree_Node *right |
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111 | ) |
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112 | { |
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113 | const Objects_Id *the_left; |
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114 | const Thread_Proxy_control *the_right; |
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115 | |
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116 | the_left = left; |
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117 | the_right = THREAD_MP_PROXY_OF_ACTIVE_NODE( right ); |
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118 | |
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119 | return *the_left < the_right->Object.id; |
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120 | } |
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121 | |
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122 | static void *_Thread_MP_Proxy_map( RBTree_Node *node ) |
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123 | { |
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124 | return THREAD_MP_PROXY_OF_ACTIVE_NODE( node ); |
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125 | } |
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126 | |
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127 | Thread_Control *_Thread_MP_Allocate_proxy ( |
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128 | States_Control the_state |
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129 | ) |
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130 | { |
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131 | Thread_Proxy_control *the_proxy; |
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132 | ISR_lock_Context lock_context; |
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133 | |
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134 | _Thread_MP_Proxies_acquire( &lock_context ); |
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135 | |
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136 | the_proxy = (Thread_Proxy_control *) |
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137 | _Chain_Get_unprotected( &_Thread_MP_Inactive_proxies ); |
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138 | if ( the_proxy != NULL ) { |
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139 | Thread_Control *executing; |
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140 | MP_packet_Prefix *receive_packet; |
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141 | Objects_Id source_tid; |
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142 | |
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143 | executing = _Thread_Executing; |
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144 | receive_packet = _MPCI_Receive_server_tcb->receive_packet; |
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145 | source_tid = receive_packet->source_tid; |
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146 | |
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147 | executing->Wait.return_code = THREAD_STATUS_PROXY_BLOCKING; |
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148 | |
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149 | the_proxy->receive_packet = receive_packet; |
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150 | the_proxy->Object.id = source_tid; |
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151 | the_proxy->Real_priority.priority = receive_packet->source_priority; |
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152 | the_proxy->current_state = _States_Set( STATES_DORMANT, the_state ); |
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153 | |
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154 | the_proxy->Wait.count = executing->Wait.count; |
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155 | the_proxy->Wait.return_argument = executing->Wait.return_argument; |
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156 | the_proxy->Wait.return_argument_second = executing->Wait.return_argument_second; |
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157 | the_proxy->Wait.option = executing->Wait.option; |
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158 | the_proxy->Wait.return_code = executing->Wait.return_code; |
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159 | |
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160 | the_proxy->thread_queue_callout = _Thread_queue_MP_callout_do_nothing; |
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161 | |
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162 | _RBTree_Insert_inline( |
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163 | &_Thread_MP_Active_proxies, |
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164 | &the_proxy->Active, |
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165 | &source_tid, |
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166 | _Thread_MP_Proxy_less |
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167 | ); |
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168 | |
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169 | _Thread_MP_Proxies_release( &lock_context ); |
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170 | |
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171 | return (Thread_Control *) the_proxy; |
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172 | } |
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173 | |
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174 | _Thread_MP_Proxies_release( &lock_context ); |
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175 | |
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176 | _Internal_error( INTERNAL_ERROR_OUT_OF_PROXIES ); |
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177 | |
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178 | /* |
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179 | * NOTE: The following return ensures that the compiler will |
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180 | * think that all paths return a value. |
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181 | */ |
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182 | |
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183 | return NULL; |
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184 | } |
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185 | |
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186 | Thread_Control *_Thread_MP_Find_proxy ( |
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187 | Objects_Id the_id |
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188 | ) |
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189 | { |
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190 | Thread_Proxy_control *the_proxy; |
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191 | ISR_lock_Context lock_context; |
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192 | |
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193 | _Thread_MP_Proxies_acquire( &lock_context ); |
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194 | |
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195 | the_proxy = _RBTree_Find_inline( |
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196 | &_Thread_MP_Active_proxies, |
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197 | &the_id, |
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198 | _Thread_MP_Proxy_equal, |
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199 | _Thread_MP_Proxy_less, |
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200 | _Thread_MP_Proxy_map |
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201 | ); |
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202 | |
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203 | _Thread_MP_Proxies_release( &lock_context ); |
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204 | |
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205 | return (Thread_Control *) the_proxy; |
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206 | } |
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207 | |
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208 | void _Thread_MP_Free_proxy( Thread_Control *the_thread ) |
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209 | { |
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210 | Thread_Proxy_control *the_proxy; |
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211 | ISR_lock_Context lock_context; |
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212 | |
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213 | the_proxy = (Thread_Proxy_control *) the_thread; |
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214 | |
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215 | _Thread_MP_Proxies_acquire( &lock_context ); |
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216 | |
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217 | _RBTree_Extract( &_Thread_MP_Active_proxies, &the_proxy->Active ); |
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218 | _Chain_Append_unprotected( |
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219 | &_Thread_MP_Inactive_proxies, |
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220 | &the_proxy->Object.Node |
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221 | ); |
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222 | |
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223 | _Thread_MP_Proxies_release( &lock_context ); |
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224 | } |
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