1 | /* |
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2 | * Thread Queue 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/isr.h> |
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19 | #include <rtems/object.h> |
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20 | #include <rtems/states.h> |
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21 | #include <rtems/thread.h> |
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22 | #include <rtems/threadq.h> |
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23 | #include <rtems/tqdata.h> |
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24 | |
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25 | /*PAGE |
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26 | * |
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27 | * _Thread_queue_Initialize |
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28 | * |
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29 | * This routine initializes the specified threadq. |
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30 | * |
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31 | * Input parameters: |
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32 | * the_thread_queue - pointer to a threadq header |
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33 | * attribute_set - used to determine queueing discipline |
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34 | * state - state of waiting threads |
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35 | * |
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36 | * Output parameters: NONE |
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37 | */ |
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38 | |
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39 | void _Thread_queue_Initialize( |
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40 | Thread_queue_Control *the_thread_queue, |
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41 | rtems_attribute attribute_set, |
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42 | States_Control state |
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43 | ) |
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44 | { |
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45 | unsigned32 index; |
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46 | |
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47 | if ( _Attributes_Is_priority( attribute_set ) ) { |
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48 | the_thread_queue->discipline = THREAD_QUEUE_DATA_PRIORITY_DISCIPLINE; |
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49 | for( index=0 ; |
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50 | index < TASK_QUEUE_DATA_NUMBER_OF_PRIORITY_HEADERS ; |
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51 | index++) |
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52 | _Chain_Initialize_empty( &the_thread_queue->Queues.Priority[index] ); |
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53 | } |
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54 | else { |
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55 | the_thread_queue->discipline = THREAD_QUEUE_DATA_FIFO_DISCIPLINE; |
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56 | _Chain_Initialize_empty( &the_thread_queue->Queues.Fifo ); |
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57 | } |
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58 | |
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59 | the_thread_queue->state = state; |
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60 | |
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61 | } |
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62 | |
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63 | /*PAGE |
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64 | * |
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65 | * _Thread_queue_Enqueue |
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66 | * |
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67 | * This routine blocks a thread, places it on a thread, and optionally |
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68 | * starts a timeout timer. |
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69 | * |
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70 | * Input parameters: |
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71 | * the_thread_queue - pointer to threadq |
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72 | * timeout - interval to wait |
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73 | * |
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74 | * Output parameters: NONE |
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75 | * |
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76 | * INTERRUPT LATENCY: |
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77 | * only case |
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78 | */ |
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79 | |
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80 | void _Thread_queue_Enqueue( |
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81 | Thread_queue_Control *the_thread_queue, |
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82 | rtems_interval timeout |
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83 | ) |
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84 | { |
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85 | Thread_Control *the_thread; |
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86 | |
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87 | the_thread = _Thread_Executing; |
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88 | |
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89 | if ( _Thread_MP_Is_receive( the_thread ) ) |
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90 | the_thread = _Thread_MP_Allocate_proxy( the_thread_queue->state ); |
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91 | else |
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92 | _Thread_Set_state( the_thread, the_thread_queue->state ); |
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93 | |
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94 | if ( timeout ) { |
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95 | _Watchdog_Initialize( |
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96 | &the_thread->Timer, |
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97 | _Thread_queue_Timeout, |
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98 | the_thread->Object.id, |
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99 | NULL |
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100 | ); |
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101 | |
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102 | _Watchdog_Insert_ticks( |
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103 | &the_thread->Timer, |
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104 | timeout, |
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105 | WATCHDOG_NO_ACTIVATE |
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106 | ); |
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107 | } |
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108 | |
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109 | switch( the_thread_queue->discipline ) { |
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110 | case THREAD_QUEUE_DATA_FIFO_DISCIPLINE: |
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111 | _Thread_queue_Enqueue_fifo( the_thread_queue, the_thread, timeout ); |
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112 | break; |
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113 | case THREAD_QUEUE_DATA_PRIORITY_DISCIPLINE: |
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114 | _Thread_queue_Enqueue_priority( |
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115 | the_thread_queue, the_thread, timeout ); |
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116 | break; |
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117 | } |
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118 | } |
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119 | |
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120 | /*PAGE |
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121 | * |
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122 | * _Thread_queue_Dequeue |
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123 | * |
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124 | * This routine removes a thread from the specified threadq. If the |
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125 | * threadq discipline is RTEMS_FIFO, it unblocks a thread, and cancels its |
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126 | * timeout timer. Priority discipline is processed elsewhere. |
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127 | * |
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128 | * Input parameters: |
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129 | * the_thread_queue - pointer to threadq |
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130 | * |
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131 | * Output parameters: |
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132 | * returns - thread dequeued or NULL |
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133 | * |
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134 | * INTERRUPT LATENCY: |
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135 | * check sync |
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136 | * RTEMS_FIFO |
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137 | */ |
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138 | |
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139 | Thread_Control *_Thread_queue_Dequeue( |
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140 | Thread_queue_Control *the_thread_queue |
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141 | ) |
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142 | { |
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143 | Thread_Control *the_thread; |
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144 | ISR_Level level; |
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145 | |
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146 | switch ( the_thread_queue->discipline ) { |
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147 | case THREAD_QUEUE_DATA_FIFO_DISCIPLINE: |
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148 | the_thread = _Thread_queue_Dequeue_fifo( the_thread_queue ); |
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149 | break; |
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150 | case THREAD_QUEUE_DATA_PRIORITY_DISCIPLINE: |
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151 | the_thread = _Thread_queue_Dequeue_priority( the_thread_queue ); |
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152 | break; |
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153 | default: /* this is only to prevent warnings */ |
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154 | the_thread = NULL; |
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155 | break; |
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156 | } |
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157 | |
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158 | if ( !_Thread_Is_null( the_thread ) ) |
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159 | return( the_thread ); |
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160 | |
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161 | _ISR_Disable( level ); |
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162 | if ( the_thread_queue->sync == FALSE ) { |
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163 | _ISR_Enable( level ); |
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164 | return( NULL ); |
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165 | } |
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166 | |
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167 | the_thread_queue->sync = FALSE; |
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168 | _ISR_Enable( level ); |
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169 | return( _Thread_Executing ); |
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170 | } |
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171 | |
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172 | /*PAGE |
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173 | * |
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174 | * _Thread_queue_Extract |
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175 | * |
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176 | * This routine removes a specific thread from the specified threadq, |
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177 | * deletes any timeout, and unblocks the thread. |
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178 | * |
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179 | * Input parameters: |
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180 | * the_thread_queue - pointer to a threadq header |
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181 | * the_thread - pointer to a thread control block |
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182 | * |
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183 | * Output parameters: NONE |
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184 | * |
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185 | * INTERRUPT LATENCY: NONE |
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186 | */ |
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187 | |
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188 | void _Thread_queue_Extract( |
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189 | Thread_queue_Control *the_thread_queue, |
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190 | Thread_Control *the_thread |
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191 | ) |
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192 | { |
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193 | switch ( the_thread_queue->discipline ) { |
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194 | case THREAD_QUEUE_DATA_FIFO_DISCIPLINE: |
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195 | _Thread_queue_Extract_fifo( the_thread_queue, the_thread ); |
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196 | break; |
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197 | case THREAD_QUEUE_DATA_PRIORITY_DISCIPLINE: |
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198 | _Thread_queue_Extract_priority( the_thread_queue, the_thread ); |
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199 | break; |
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200 | } |
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201 | } |
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202 | |
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203 | /*PAGE |
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204 | * |
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205 | * _Thread_queue_Flush |
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206 | * |
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207 | * This kernel routine flushes the given thread queue. |
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208 | * |
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209 | * Input parameters: |
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210 | * the_thread_queue - pointer to threadq to be flushed |
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211 | * |
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212 | * Output parameters: NONE |
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213 | */ |
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214 | |
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215 | void _Thread_queue_Flush( |
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216 | Thread_queue_Control *the_thread_queue, |
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217 | Thread_queue_Flush_callout remote_extract_callout |
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218 | ) |
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219 | { |
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220 | Thread_Control *the_thread; |
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221 | |
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222 | while ( (the_thread = _Thread_queue_Dequeue( the_thread_queue )) ) { |
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223 | if ( _Objects_Is_local_id( the_thread->Object.id ) ) |
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224 | the_thread->Wait.return_code = RTEMS_OBJECT_WAS_DELETED; |
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225 | else |
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226 | ( *remote_extract_callout )( the_thread ); |
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227 | } |
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228 | } |
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229 | |
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230 | /*PAGE |
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231 | * |
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232 | * _Thread_queue_First |
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233 | * |
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234 | * This routines returns a pointer to the first thread on the |
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235 | * specified threadq. |
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236 | * |
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237 | * Input parameters: |
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238 | * the_thread_queue - pointer to thread queue |
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239 | * |
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240 | * Output parameters: |
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241 | * returns - first thread or NULL |
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242 | */ |
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243 | |
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244 | Thread_Control *_Thread_queue_First( |
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245 | Thread_queue_Control *the_thread_queue |
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246 | ) |
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247 | { |
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248 | Thread_Control *the_thread; |
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249 | |
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250 | switch ( the_thread_queue->discipline ) { |
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251 | case THREAD_QUEUE_DATA_FIFO_DISCIPLINE: |
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252 | the_thread = _Thread_queue_First_fifo( the_thread_queue ); |
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253 | break; |
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254 | case THREAD_QUEUE_DATA_PRIORITY_DISCIPLINE: |
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255 | the_thread = _Thread_queue_First_priority( the_thread_queue ); |
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256 | break; |
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257 | default: /* this is only to prevent warnings */ |
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258 | the_thread = NULL; |
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259 | break; |
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260 | } |
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261 | |
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262 | return the_thread; |
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263 | } |
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264 | |
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265 | /*PAGE |
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266 | * |
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267 | * _Thread_queue_Timeout |
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268 | * |
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269 | * This routine processes a thread which timeouts while waiting on |
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270 | * a thread queue. It is called by the watchdog handler. |
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271 | * |
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272 | * Input parameters: |
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273 | * id - thread id |
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274 | * |
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275 | * Output parameters: NONE |
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276 | */ |
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277 | |
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278 | void _Thread_queue_Timeout( |
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279 | Objects_Id id, |
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280 | void *ignored |
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281 | ) |
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282 | { |
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283 | Thread_Control *the_thread; |
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284 | Objects_Locations location; |
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285 | |
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286 | the_thread = _Thread_Get( id, &location ); |
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287 | switch ( location ) { |
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288 | case OBJECTS_ERROR: |
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289 | case OBJECTS_REMOTE: /* impossible */ |
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290 | break; |
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291 | case OBJECTS_LOCAL: |
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292 | the_thread->Wait.return_code = RTEMS_TIMEOUT; |
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293 | _Thread_queue_Extract( the_thread->Wait.queue, the_thread ); |
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294 | _Thread_Unnest_dispatch(); |
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295 | break; |
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296 | } |
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297 | } |
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298 | |
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299 | /*PAGE |
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300 | * |
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301 | * _Thread_queue_Enqueue_fifo |
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302 | * |
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303 | * This routine blocks a thread, places it on a thread, and optionally |
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304 | * starts a timeout timer. |
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305 | * |
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306 | * Input parameters: |
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307 | * the_thread_queue - pointer to threadq |
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308 | * the_thread - pointer to the thread to block |
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309 | * timeout - interval to wait |
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310 | * |
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311 | * Output parameters: NONE |
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312 | * |
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313 | * INTERRUPT LATENCY: |
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314 | * only case |
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315 | */ |
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316 | |
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317 | void _Thread_queue_Enqueue_fifo ( |
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318 | Thread_queue_Control *the_thread_queue, |
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319 | Thread_Control *the_thread, |
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320 | rtems_interval timeout |
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321 | ) |
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322 | { |
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323 | ISR_Level level; |
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324 | |
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325 | _ISR_Disable( level ); |
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326 | if ( the_thread_queue->sync == TRUE ) { |
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327 | the_thread_queue->sync = FALSE; |
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328 | |
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329 | _Chain_Append_unprotected( |
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330 | &the_thread_queue->Queues.Fifo, |
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331 | &the_thread->Object.Node |
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332 | ); |
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333 | |
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334 | if ( timeout != RTEMS_NO_TIMEOUT ) |
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335 | _Watchdog_Activate( &the_thread->Timer ); |
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336 | |
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337 | _ISR_Enable( level ); |
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338 | return; |
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339 | } |
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340 | |
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341 | if ( !_Watchdog_Is_active( &the_thread->Timer ) ) { |
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342 | _ISR_Enable( level ); |
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343 | _Thread_Unblock( the_thread ); |
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344 | } else { |
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345 | _Watchdog_Deactivate( &the_thread->Timer ); |
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346 | _ISR_Enable( level ); |
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347 | (void) _Watchdog_Remove( &the_thread->Timer ); |
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348 | _Thread_Unblock( the_thread ); |
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349 | } |
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350 | |
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351 | if ( !_Objects_Is_local_id( the_thread->Object.id ) ) |
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352 | _Thread_MP_Free_proxy( the_thread ); |
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353 | |
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354 | } |
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355 | |
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356 | /*PAGE |
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357 | * |
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358 | * _Thread_queue_Dequeue_fifo |
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359 | * |
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360 | * This routine removes a thread from the specified threadq. |
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361 | * |
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362 | * Input parameters: |
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363 | * the_thread_queue - pointer to threadq |
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364 | * |
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365 | * Output parameters: |
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366 | * returns - thread dequeued or NULL |
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367 | * |
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368 | * INTERRUPT LATENCY: |
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369 | * check sync |
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370 | * RTEMS_FIFO |
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371 | */ |
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372 | |
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373 | Thread_Control *_Thread_queue_Dequeue_fifo( |
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374 | Thread_queue_Control *the_thread_queue |
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375 | ) |
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376 | { |
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377 | ISR_Level level; |
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378 | Thread_Control *the_thread; |
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379 | |
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380 | _ISR_Disable( level ); |
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381 | if ( !_Chain_Is_empty( &the_thread_queue->Queues.Fifo ) ) { |
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382 | |
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383 | the_thread = (Thread_Control *) |
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384 | _Chain_Get_first_unprotected( &the_thread_queue->Queues.Fifo ); |
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385 | |
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386 | if ( !_Watchdog_Is_active( &the_thread->Timer ) ) { |
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387 | _ISR_Enable( level ); |
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388 | _Thread_Unblock( the_thread ); |
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389 | } else { |
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390 | _Watchdog_Deactivate( &the_thread->Timer ); |
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391 | _ISR_Enable( level ); |
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392 | (void) _Watchdog_Remove( &the_thread->Timer ); |
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393 | _Thread_Unblock( the_thread ); |
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394 | } |
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395 | |
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396 | if ( !_Objects_Is_local_id( the_thread->Object.id ) ) |
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397 | _Thread_MP_Free_proxy( the_thread ); |
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398 | |
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399 | return( the_thread ); |
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400 | } |
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401 | _ISR_Enable( level ); |
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402 | return( NULL ); |
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403 | } |
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404 | |
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405 | /*PAGE |
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406 | * |
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407 | * _Thread_queue_Extract_fifo |
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408 | * |
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409 | * This routine removes a specific thread from the specified threadq, |
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410 | * deletes any timeout, and unblocks the thread. |
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411 | * |
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412 | * Input parameters: |
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413 | * the_thread_queue - pointer to a threadq header |
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414 | * the_thread - pointer to the thread to block |
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415 | * |
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416 | * Output parameters: NONE |
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417 | * |
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418 | * INTERRUPT LATENCY: |
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419 | * EXTRACT_FIFO |
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420 | */ |
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421 | |
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422 | void _Thread_queue_Extract_fifo( |
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423 | Thread_queue_Control *the_thread_queue, |
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424 | Thread_Control *the_thread |
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425 | ) |
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426 | { |
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427 | ISR_Level level; |
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428 | |
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429 | _ISR_Disable( level ); |
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430 | |
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431 | if ( !_States_Is_waiting_on_thread_queue( the_thread->current_state ) ) { |
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432 | _ISR_Enable( level ); |
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433 | return; |
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434 | } |
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435 | |
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436 | _Chain_Extract_unprotected( &the_thread->Object.Node ); |
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437 | |
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438 | if ( !_Watchdog_Is_active( &the_thread->Timer ) ) { |
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439 | _ISR_Enable( level ); |
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440 | _Thread_Unblock( the_thread ); |
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441 | } else { |
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442 | _Watchdog_Deactivate( &the_thread->Timer ); |
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443 | _ISR_Enable( level ); |
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444 | (void) _Watchdog_Remove( &the_thread->Timer ); |
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445 | _Thread_Unblock( the_thread ); |
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446 | } |
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447 | |
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448 | if ( !_Objects_Is_local_id( the_thread->Object.id ) ) |
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449 | _Thread_MP_Free_proxy( the_thread ); |
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450 | } |
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451 | |
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452 | /*PAGE |
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453 | * |
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454 | * _Thread_queue_First_fifo |
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455 | * |
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456 | * This routines returns a pointer to the first thread on the |
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457 | * specified threadq. |
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458 | * |
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459 | * Input parameters: |
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460 | * the_thread_queue - pointer to threadq |
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461 | * |
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462 | * Output parameters: |
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463 | * returns - first thread or NULL |
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464 | */ |
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465 | |
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466 | Thread_Control *_Thread_queue_First_fifo( |
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467 | Thread_queue_Control *the_thread_queue |
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468 | ) |
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469 | { |
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470 | if ( !_Chain_Is_empty( &the_thread_queue->Queues.Fifo ) ) |
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471 | return (Thread_Control *) the_thread_queue->Queues.Fifo.first; |
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472 | |
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473 | return NULL; |
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474 | } |
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475 | |
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476 | /*PAGE |
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477 | * |
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478 | * _Thread_queue_Enqueue_priority |
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479 | * |
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480 | * This routine blocks a thread, places it on a thread, and optionally |
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481 | * starts a timeout timer. |
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482 | * |
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483 | * Input parameters: |
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484 | * the_thread_queue - pointer to threadq |
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485 | * thread - thread to insert |
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486 | * timeout - timeout interval in ticks |
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487 | * |
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488 | * Output parameters: NONE |
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489 | * |
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490 | * INTERRUPT LATENCY: |
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491 | * forward less than |
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492 | * forward equal |
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493 | */ |
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494 | |
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495 | void _Thread_queue_Enqueue_priority( |
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496 | Thread_queue_Control *the_thread_queue, |
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497 | Thread_Control *the_thread, |
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498 | rtems_interval timeout |
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499 | ) |
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500 | { |
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501 | rtems_task_priority search_priority; |
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502 | Thread_Control *search_thread; |
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503 | ISR_Level level; |
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504 | Chain_Control *header; |
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505 | unsigned32 header_index; |
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506 | Chain_Node *the_node; |
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507 | Chain_Node *next_node; |
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508 | Chain_Node *previous_node; |
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509 | Chain_Node *search_node; |
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510 | rtems_task_priority priority; |
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511 | States_Control block_state; |
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512 | |
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513 | _Chain_Initialize_empty( &the_thread->Wait.Block2n ); |
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514 | |
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515 | priority = the_thread->current_priority; |
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516 | header_index = _Thread_queue_Header_number( priority ); |
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517 | header = &the_thread_queue->Queues.Priority[ header_index ]; |
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518 | block_state = the_thread_queue->state; |
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519 | |
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520 | if ( _Thread_queue_Is_reverse_search( priority ) ) |
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521 | goto restart_reverse_search; |
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522 | |
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523 | restart_forward_search: |
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524 | search_priority = RTEMS_MINIMUM_PRIORITY - 1; |
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525 | _ISR_Disable( level ); |
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526 | search_thread = (Thread_Control *) header->first; |
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527 | while ( !_Chain_Is_tail( header, (Chain_Node *)search_thread ) ) { |
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528 | search_priority = search_thread->current_priority; |
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529 | if ( priority <= search_priority ) |
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530 | break; |
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531 | |
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532 | #if ( CPU_UNROLL_ENQUEUE_PRIORITY == TRUE ) |
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533 | search_thread = (Thread_Control *) search_thread->Object.Node.next; |
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534 | if ( _Chain_Is_tail( header, (Chain_Node *)search_thread ) ) |
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535 | break; |
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536 | search_priority = search_thread->current_priority; |
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537 | if ( priority <= search_priority ) |
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538 | break; |
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539 | #endif |
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540 | _ISR_Flash( level ); |
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541 | if ( !_States_Are_set( search_thread->current_state, block_state) ) { |
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542 | _ISR_Enable( level ); |
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543 | goto restart_forward_search; |
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544 | } |
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545 | search_thread = |
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546 | (Thread_Control *)search_thread->Object.Node.next; |
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547 | } |
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548 | if ( the_thread_queue->sync == FALSE ) |
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549 | goto syncronize; |
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550 | |
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551 | the_thread_queue->sync = FALSE; |
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552 | if ( timeout != RTEMS_NO_TIMEOUT ) |
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553 | _Watchdog_Activate( &the_thread->Timer ); |
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554 | |
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555 | if ( priority == search_priority ) |
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556 | goto equal_priority; |
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557 | |
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558 | search_node = (Chain_Node *) search_thread; |
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559 | previous_node = search_node->previous; |
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560 | the_node = (Chain_Node *) the_thread; |
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561 | |
---|
562 | the_node->next = search_node; |
---|
563 | the_node->previous = previous_node; |
---|
564 | previous_node->next = the_node; |
---|
565 | search_node->previous = the_node; |
---|
566 | _ISR_Enable( level ); |
---|
567 | return; |
---|
568 | |
---|
569 | restart_reverse_search: |
---|
570 | search_priority = RTEMS_MAXIMUM_PRIORITY + 1; |
---|
571 | |
---|
572 | _ISR_Disable( level ); |
---|
573 | search_thread = (Thread_Control *) header->last; |
---|
574 | while ( !_Chain_Is_head( header, (Chain_Node *)search_thread ) ) { |
---|
575 | search_priority = search_thread->current_priority; |
---|
576 | if ( priority >= search_priority ) |
---|
577 | break; |
---|
578 | #if ( CPU_UNROLL_ENQUEUE_PRIORITY == TRUE ) |
---|
579 | search_thread = (Thread_Control *) search_thread->Object.Node.previous; |
---|
580 | if ( _Chain_Is_head( header, (Chain_Node *)search_thread ) ) |
---|
581 | break; |
---|
582 | search_priority = search_thread->current_priority; |
---|
583 | if ( priority >= search_priority ) |
---|
584 | break; |
---|
585 | #endif |
---|
586 | _ISR_Flash( level ); |
---|
587 | if ( !_States_Are_set( search_thread->current_state, block_state) ) { |
---|
588 | _ISR_Enable( level ); |
---|
589 | goto restart_reverse_search; |
---|
590 | } |
---|
591 | search_thread = (Thread_Control *) |
---|
592 | search_thread->Object.Node.previous; |
---|
593 | } |
---|
594 | if ( !the_thread_queue->sync ) |
---|
595 | goto syncronize; |
---|
596 | |
---|
597 | the_thread_queue->sync = FALSE; |
---|
598 | if ( timeout != RTEMS_NO_TIMEOUT ) |
---|
599 | _Watchdog_Activate( &the_thread->Timer ); |
---|
600 | |
---|
601 | if ( priority == search_priority ) |
---|
602 | goto equal_priority; |
---|
603 | |
---|
604 | search_node = (Chain_Node *) search_thread; |
---|
605 | next_node = search_node->next; |
---|
606 | the_node = (Chain_Node *) the_thread; |
---|
607 | |
---|
608 | the_node->next = next_node; |
---|
609 | the_node->previous = search_node; |
---|
610 | search_node->next = the_node; |
---|
611 | next_node->previous = the_node; |
---|
612 | _ISR_Enable( level ); |
---|
613 | return; |
---|
614 | |
---|
615 | equal_priority: /* add at end of priority group */ |
---|
616 | search_node = _Chain_Tail( &search_thread->Wait.Block2n ); |
---|
617 | previous_node = search_node->previous; |
---|
618 | the_node = (Chain_Node *) the_thread; |
---|
619 | |
---|
620 | the_node->next = search_node; |
---|
621 | the_node->previous = previous_node; |
---|
622 | previous_node->next = the_node; |
---|
623 | search_node->previous = the_node; |
---|
624 | _ISR_Enable( level ); |
---|
625 | return; |
---|
626 | |
---|
627 | syncronize: |
---|
628 | if ( !_Watchdog_Is_active( &the_thread->Timer ) ) { |
---|
629 | _ISR_Enable( level ); |
---|
630 | _Thread_Unblock( the_thread ); |
---|
631 | } else { |
---|
632 | _Watchdog_Deactivate( &the_thread->Timer ); |
---|
633 | _ISR_Enable( level ); |
---|
634 | (void) _Watchdog_Remove( &the_thread->Timer ); |
---|
635 | _Thread_Unblock( the_thread ); |
---|
636 | } |
---|
637 | if ( !_Objects_Is_local_id( the_thread->Object.id ) ) |
---|
638 | _Thread_MP_Free_proxy( the_thread ); |
---|
639 | } |
---|
640 | |
---|
641 | /*PAGE |
---|
642 | * |
---|
643 | * _Thread_queue_Dequeue_priority |
---|
644 | * |
---|
645 | * This routine removes a thread from the specified RTEMS_PRIORITY based |
---|
646 | * threadq, unblocks it, and cancels its timeout timer. |
---|
647 | * |
---|
648 | * Input parameters: |
---|
649 | * the_thread_queue - pointer to thread queue |
---|
650 | * |
---|
651 | * Output parameters: |
---|
652 | * returns - thread dequeued or NULL |
---|
653 | * |
---|
654 | * INTERRUPT LATENCY: |
---|
655 | * only case |
---|
656 | */ |
---|
657 | |
---|
658 | Thread_Control *_Thread_queue_Dequeue_priority( |
---|
659 | Thread_queue_Control *the_thread_queue |
---|
660 | ) |
---|
661 | { |
---|
662 | unsigned32 index; |
---|
663 | ISR_Level level; |
---|
664 | Thread_Control *the_thread; |
---|
665 | Thread_Control *new_first_thread; |
---|
666 | Chain_Node *new_first_node; |
---|
667 | Chain_Node *new_second_node; |
---|
668 | Chain_Node *last_node; |
---|
669 | Chain_Node *next_node; |
---|
670 | Chain_Node *previous_node; |
---|
671 | |
---|
672 | for( index=0 ; |
---|
673 | index < TASK_QUEUE_DATA_NUMBER_OF_PRIORITY_HEADERS ; |
---|
674 | index++ ) { |
---|
675 | _ISR_Disable( level ); |
---|
676 | if ( !_Chain_Is_empty( &the_thread_queue->Queues.Priority[ index ] ) ) { |
---|
677 | the_thread = (Thread_Control *) |
---|
678 | the_thread_queue->Queues.Priority[ index ].first; |
---|
679 | goto dequeue; |
---|
680 | } |
---|
681 | _ISR_Enable( level ); |
---|
682 | } |
---|
683 | return NULL; |
---|
684 | |
---|
685 | dequeue: |
---|
686 | new_first_node = the_thread->Wait.Block2n.first; |
---|
687 | new_first_thread = (Thread_Control *) new_first_node; |
---|
688 | next_node = the_thread->Object.Node.next; |
---|
689 | previous_node = the_thread->Object.Node.previous; |
---|
690 | |
---|
691 | if ( !_Chain_Is_empty( &the_thread->Wait.Block2n ) ) { |
---|
692 | last_node = the_thread->Wait.Block2n.last; |
---|
693 | new_second_node = new_first_node->next; |
---|
694 | |
---|
695 | previous_node->next = new_first_node; |
---|
696 | next_node->previous = new_first_node; |
---|
697 | new_first_node->next = next_node; |
---|
698 | new_first_node->previous = previous_node; |
---|
699 | |
---|
700 | if ( !_Chain_Has_only_one_node( &the_thread->Wait.Block2n ) ) { |
---|
701 | /* > two threads on 2-n */ |
---|
702 | new_second_node->previous = |
---|
703 | _Chain_Head( &new_first_thread->Wait.Block2n ); |
---|
704 | |
---|
705 | new_first_thread->Wait.Block2n.first = new_second_node; |
---|
706 | new_first_thread->Wait.Block2n.last = last_node; |
---|
707 | |
---|
708 | last_node->next = _Chain_Tail( &new_first_thread->Wait.Block2n ); |
---|
709 | } |
---|
710 | } else { |
---|
711 | previous_node->next = next_node; |
---|
712 | next_node->previous = previous_node; |
---|
713 | } |
---|
714 | |
---|
715 | if ( !_Watchdog_Is_active( &the_thread->Timer ) ) { |
---|
716 | _ISR_Enable( level ); |
---|
717 | _Thread_Unblock( the_thread ); |
---|
718 | } else { |
---|
719 | _Watchdog_Deactivate( &the_thread->Timer ); |
---|
720 | _ISR_Enable( level ); |
---|
721 | (void) _Watchdog_Remove( &the_thread->Timer ); |
---|
722 | _Thread_Unblock( the_thread ); |
---|
723 | } |
---|
724 | |
---|
725 | if ( !_Objects_Is_local_id( the_thread->Object.id ) ) |
---|
726 | _Thread_MP_Free_proxy( the_thread ); |
---|
727 | return( the_thread ); |
---|
728 | } |
---|
729 | |
---|
730 | /*PAGE |
---|
731 | * |
---|
732 | * _Thread_queue_Extract_priority |
---|
733 | * |
---|
734 | * This routine removes a specific thread from the specified threadq, |
---|
735 | * deletes any timeout, and unblocks the thread. |
---|
736 | * |
---|
737 | * Input parameters: |
---|
738 | * the_thread_queue - pointer to a threadq header |
---|
739 | * the_thread - pointer to a thread control block |
---|
740 | * |
---|
741 | * Output parameters: NONE |
---|
742 | * |
---|
743 | * INTERRUPT LATENCY: |
---|
744 | * EXTRACT_PRIORITY |
---|
745 | */ |
---|
746 | |
---|
747 | void _Thread_queue_Extract_priority( |
---|
748 | Thread_queue_Control *the_thread_queue, |
---|
749 | Thread_Control *the_thread |
---|
750 | ) |
---|
751 | { |
---|
752 | ISR_Level level; |
---|
753 | Chain_Node *the_node; |
---|
754 | Chain_Node *next_node; |
---|
755 | Chain_Node *previous_node; |
---|
756 | Thread_Control *new_first_thread; |
---|
757 | Chain_Node *new_first_node; |
---|
758 | Chain_Node *new_second_node; |
---|
759 | Chain_Node *last_node; |
---|
760 | |
---|
761 | the_node = (Chain_Node *) the_thread; |
---|
762 | _ISR_Disable( level ); |
---|
763 | if ( _States_Is_waiting_on_thread_queue( the_thread->current_state ) ) { |
---|
764 | next_node = the_node->next; |
---|
765 | previous_node = the_node->previous; |
---|
766 | |
---|
767 | if ( !_Chain_Is_empty( &the_thread->Wait.Block2n ) ) { |
---|
768 | new_first_node = the_thread->Wait.Block2n.first; |
---|
769 | new_first_thread = (Thread_Control *) new_first_node; |
---|
770 | last_node = the_thread->Wait.Block2n.last; |
---|
771 | new_second_node = new_first_node->next; |
---|
772 | |
---|
773 | previous_node->next = new_first_node; |
---|
774 | next_node->previous = new_first_node; |
---|
775 | new_first_node->next = next_node; |
---|
776 | new_first_node->previous = previous_node; |
---|
777 | |
---|
778 | if ( !_Chain_Has_only_one_node( &the_thread->Wait.Block2n ) ) { |
---|
779 | /* > two threads on 2-n */ |
---|
780 | new_second_node->previous = |
---|
781 | _Chain_Head( &new_first_thread->Wait.Block2n ); |
---|
782 | new_first_thread->Wait.Block2n.first = new_second_node; |
---|
783 | |
---|
784 | new_first_thread->Wait.Block2n.last = last_node; |
---|
785 | last_node->next = _Chain_Tail( &new_first_thread->Wait.Block2n ); |
---|
786 | } |
---|
787 | } else { |
---|
788 | previous_node->next = next_node; |
---|
789 | next_node->previous = previous_node; |
---|
790 | } |
---|
791 | |
---|
792 | if ( !_Watchdog_Is_active( &the_thread->Timer ) ) { |
---|
793 | _ISR_Enable( level ); |
---|
794 | _Thread_Unblock( the_thread ); |
---|
795 | } else { |
---|
796 | _Watchdog_Deactivate( &the_thread->Timer ); |
---|
797 | _ISR_Enable( level ); |
---|
798 | (void) _Watchdog_Remove( &the_thread->Timer ); |
---|
799 | _Thread_Unblock( the_thread ); |
---|
800 | } |
---|
801 | |
---|
802 | if ( !_Objects_Is_local_id( the_thread->Object.id ) ) |
---|
803 | _Thread_MP_Free_proxy( the_thread ); |
---|
804 | } |
---|
805 | else |
---|
806 | _ISR_Enable( level ); |
---|
807 | } |
---|
808 | |
---|
809 | /*PAGE |
---|
810 | * |
---|
811 | * _Thread_queue_First_priority |
---|
812 | * |
---|
813 | * This routines returns a pointer to the first thread on the |
---|
814 | * specified threadq. |
---|
815 | * |
---|
816 | * Input parameters: |
---|
817 | * the_thread_queue - pointer to thread queue |
---|
818 | * |
---|
819 | * Output parameters: |
---|
820 | * returns - first thread or NULL |
---|
821 | */ |
---|
822 | |
---|
823 | Thread_Control *_Thread_queue_First_priority ( |
---|
824 | Thread_queue_Control *the_thread_queue |
---|
825 | ) |
---|
826 | { |
---|
827 | unsigned32 index; |
---|
828 | |
---|
829 | for( index=0 ; |
---|
830 | index < TASK_QUEUE_DATA_NUMBER_OF_PRIORITY_HEADERS ; |
---|
831 | index++ ) { |
---|
832 | if ( !_Chain_Is_empty( &the_thread_queue->Queues.Priority[ index ] ) ) |
---|
833 | return (Thread_Control *) |
---|
834 | the_thread_queue->Queues.Priority[ index ].first; |
---|
835 | } |
---|
836 | return NULL; |
---|
837 | } |
---|