1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Inlined Routines Associated with the Manipulation of the Scheduler |
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5 | * |
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6 | * This inline file contains all of the inlined routines associated with |
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7 | * the manipulation of the scheduler. |
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8 | */ |
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9 | |
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10 | /* |
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11 | * Copyright (C) 2010 Gedare Bloom. |
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12 | * Copyright (C) 2011 On-Line Applications Research Corporation (OAR). |
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13 | * Copyright (c) 2014, 2017 embedded brains GmbH |
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14 | * |
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15 | * The license and distribution terms for this file may be |
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16 | * found in the file LICENSE in this distribution or at |
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17 | * http://www.rtems.org/license/LICENSE. |
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18 | */ |
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19 | |
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20 | #ifndef _RTEMS_SCORE_SCHEDULERIMPL_H |
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21 | #define _RTEMS_SCORE_SCHEDULERIMPL_H |
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22 | |
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23 | #include <rtems/score/scheduler.h> |
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24 | #include <rtems/score/assert.h> |
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25 | #include <rtems/score/priorityimpl.h> |
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26 | #include <rtems/score/smpimpl.h> |
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27 | #include <rtems/score/status.h> |
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28 | #include <rtems/score/threadimpl.h> |
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29 | |
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30 | #ifdef __cplusplus |
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31 | extern "C" { |
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32 | #endif |
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33 | |
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34 | /** |
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35 | * @addtogroup ScoreScheduler |
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36 | */ |
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37 | /**@{**/ |
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38 | |
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39 | /** |
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40 | * @brief Maps a priority value to support the append indicator. |
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41 | */ |
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42 | #define SCHEDULER_PRIORITY_MAP( priority ) ( ( priority ) << 1 ) |
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43 | |
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44 | /** |
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45 | * @brief Returns the plain priority value. |
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46 | */ |
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47 | #define SCHEDULER_PRIORITY_UNMAP( priority ) ( ( priority ) >> 1 ) |
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48 | |
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49 | /** |
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50 | * @brief Clears the priority append indicator bit. |
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51 | */ |
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52 | #define SCHEDULER_PRIORITY_PURIFY( priority ) \ |
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53 | ( ( priority ) & ~( (Priority_Control) SCHEDULER_PRIORITY_APPEND_FLAG ) ) |
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54 | |
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55 | /** |
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56 | * @brief Returns the priority control with the append indicator bit set. |
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57 | */ |
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58 | #define SCHEDULER_PRIORITY_APPEND( priority ) \ |
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59 | ( ( priority ) | SCHEDULER_PRIORITY_APPEND_FLAG ) |
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60 | |
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61 | /** |
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62 | * @brief Returns true, if the item should be appended to its priority group, |
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63 | * otherwise returns false and the item should be prepended to its priority |
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64 | * group. |
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65 | */ |
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66 | #define SCHEDULER_PRIORITY_IS_APPEND( priority ) \ |
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67 | ( ( ( priority ) & SCHEDULER_PRIORITY_APPEND_FLAG ) != 0 ) |
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68 | |
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69 | /** |
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70 | * @brief Initializes the scheduler to the policy chosen by the user. |
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71 | * |
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72 | * This routine initializes the scheduler to the policy chosen by the user |
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73 | * through confdefs, or to the priority scheduler with ready chains by |
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74 | * default. |
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75 | */ |
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76 | void _Scheduler_Handler_initialization( void ); |
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77 | |
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78 | RTEMS_INLINE_ROUTINE Scheduler_Context *_Scheduler_Get_context( |
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79 | const Scheduler_Control *scheduler |
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80 | ) |
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81 | { |
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82 | return scheduler->context; |
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83 | } |
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84 | |
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85 | RTEMS_INLINE_ROUTINE const Scheduler_Control *_Scheduler_Get_by_CPU( |
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86 | const Per_CPU_Control *cpu |
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87 | ) |
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88 | { |
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89 | #if defined(RTEMS_SMP) |
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90 | return cpu->Scheduler.control; |
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91 | #else |
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92 | (void) cpu; |
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93 | return &_Scheduler_Table[ 0 ]; |
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94 | #endif |
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95 | } |
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96 | |
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97 | /** |
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98 | * @brief Acquires the scheduler instance inside a critical section (interrupts |
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99 | * disabled). |
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100 | * |
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101 | * @param[in] scheduler The scheduler instance. |
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102 | * @param[in] lock_context The lock context to use for |
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103 | * _Scheduler_Release_critical(). |
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104 | */ |
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105 | RTEMS_INLINE_ROUTINE void _Scheduler_Acquire_critical( |
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106 | const Scheduler_Control *scheduler, |
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107 | ISR_lock_Context *lock_context |
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108 | ) |
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109 | { |
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110 | #if defined(RTEMS_SMP) |
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111 | Scheduler_Context *context; |
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112 | |
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113 | context = _Scheduler_Get_context( scheduler ); |
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114 | _ISR_lock_Acquire( &context->Lock, lock_context ); |
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115 | #else |
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116 | (void) scheduler; |
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117 | (void) lock_context; |
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118 | #endif |
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119 | } |
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120 | |
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121 | /** |
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122 | * @brief Releases the scheduler instance inside a critical section (interrupts |
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123 | * disabled). |
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124 | * |
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125 | * @param[in] scheduler The scheduler instance. |
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126 | * @param[in] lock_context The lock context used for |
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127 | * _Scheduler_Acquire_critical(). |
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128 | */ |
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129 | RTEMS_INLINE_ROUTINE void _Scheduler_Release_critical( |
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130 | const Scheduler_Control *scheduler, |
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131 | ISR_lock_Context *lock_context |
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132 | ) |
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133 | { |
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134 | #if defined(RTEMS_SMP) |
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135 | Scheduler_Context *context; |
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136 | |
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137 | context = _Scheduler_Get_context( scheduler ); |
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138 | _ISR_lock_Release( &context->Lock, lock_context ); |
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139 | #else |
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140 | (void) scheduler; |
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141 | (void) lock_context; |
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142 | #endif |
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143 | } |
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144 | |
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145 | #if defined(RTEMS_SMP) |
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146 | void _Scheduler_Request_ask_for_help( Thread_Control *the_thread ); |
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147 | |
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148 | /** |
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149 | * @brief Registers an ask for help request if necessary. |
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150 | * |
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151 | * The actual ask for help operation is carried out during |
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152 | * _Thread_Do_dispatch() on a processor related to the thread. This yields a |
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153 | * better separation of scheduler instances. A thread of one scheduler |
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154 | * instance should not be forced to carry out too much work for threads on |
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155 | * other scheduler instances. |
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156 | * |
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157 | * @param[in] the_thread The thread in need for help. |
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158 | */ |
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159 | RTEMS_INLINE_ROUTINE void _Scheduler_Ask_for_help( Thread_Control *the_thread ) |
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160 | { |
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161 | _Assert( _Thread_State_is_owner( the_thread ) ); |
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162 | |
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163 | if ( the_thread->Scheduler.helping_nodes > 0 ) { |
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164 | _Scheduler_Request_ask_for_help( the_thread ); |
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165 | } |
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166 | } |
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167 | #endif |
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168 | |
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169 | /** |
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170 | * The preferred method to add a new scheduler is to define the jump table |
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171 | * entries and add a case to the _Scheduler_Initialize routine. |
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172 | * |
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173 | * Generic scheduling implementations that rely on the ready queue only can |
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174 | * be found in the _Scheduler_queue_XXX functions. |
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175 | */ |
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176 | |
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177 | /* |
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178 | * Passing the Scheduler_Control* to these functions allows for multiple |
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179 | * scheduler's to exist simultaneously, which could be useful on an SMP |
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180 | * system. Then remote Schedulers may be accessible. How to protect such |
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181 | * accesses remains an open problem. |
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182 | */ |
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183 | |
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184 | /** |
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185 | * @brief General scheduling decision. |
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186 | * |
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187 | * This kernel routine implements the scheduling decision logic for |
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188 | * the scheduler. It does NOT dispatch. |
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189 | * |
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190 | * @param[in] the_thread The thread which state changed previously. |
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191 | */ |
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192 | RTEMS_INLINE_ROUTINE void _Scheduler_Schedule( Thread_Control *the_thread ) |
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193 | { |
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194 | const Scheduler_Control *scheduler; |
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195 | ISR_lock_Context lock_context; |
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196 | |
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197 | scheduler = _Thread_Scheduler_get_home( the_thread ); |
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198 | _Scheduler_Acquire_critical( scheduler, &lock_context ); |
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199 | |
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200 | ( *scheduler->Operations.schedule )( scheduler, the_thread ); |
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201 | |
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202 | _Scheduler_Release_critical( scheduler, &lock_context ); |
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203 | } |
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204 | |
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205 | /** |
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206 | * @brief Scheduler yield with a particular thread. |
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207 | * |
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208 | * This routine is invoked when a thread wishes to voluntarily transfer control |
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209 | * of the processor to another thread. |
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210 | * |
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211 | * @param[in] the_thread The yielding thread. |
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212 | */ |
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213 | RTEMS_INLINE_ROUTINE void _Scheduler_Yield( Thread_Control *the_thread ) |
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214 | { |
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215 | const Scheduler_Control *scheduler; |
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216 | ISR_lock_Context lock_context; |
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217 | |
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218 | scheduler = _Thread_Scheduler_get_home( the_thread ); |
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219 | _Scheduler_Acquire_critical( scheduler, &lock_context ); |
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220 | ( *scheduler->Operations.yield )( |
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221 | scheduler, |
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222 | the_thread, |
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223 | _Thread_Scheduler_get_home_node( the_thread ) |
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224 | ); |
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225 | _Scheduler_Release_critical( scheduler, &lock_context ); |
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226 | } |
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227 | |
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228 | /** |
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229 | * @brief Blocks a thread with respect to the scheduler. |
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230 | * |
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231 | * This routine removes @a the_thread from the scheduling decision for |
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232 | * the scheduler. The primary task is to remove the thread from the |
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233 | * ready queue. It performs any necessary schedulering operations |
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234 | * including the selection of a new heir thread. |
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235 | * |
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236 | * @param[in] the_thread The thread. |
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237 | */ |
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238 | RTEMS_INLINE_ROUTINE void _Scheduler_Block( Thread_Control *the_thread ) |
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239 | { |
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240 | #if defined(RTEMS_SMP) |
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241 | Chain_Node *node; |
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242 | const Chain_Node *tail; |
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243 | Scheduler_Node *scheduler_node; |
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244 | const Scheduler_Control *scheduler; |
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245 | ISR_lock_Context lock_context; |
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246 | |
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247 | node = _Chain_First( &the_thread->Scheduler.Scheduler_nodes ); |
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248 | tail = _Chain_Immutable_tail( &the_thread->Scheduler.Scheduler_nodes ); |
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249 | |
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250 | scheduler_node = SCHEDULER_NODE_OF_THREAD_SCHEDULER_NODE( node ); |
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251 | scheduler = _Scheduler_Node_get_scheduler( scheduler_node ); |
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252 | |
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253 | _Scheduler_Acquire_critical( scheduler, &lock_context ); |
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254 | ( *scheduler->Operations.block )( |
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255 | scheduler, |
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256 | the_thread, |
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257 | scheduler_node |
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258 | ); |
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259 | _Scheduler_Release_critical( scheduler, &lock_context ); |
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260 | |
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261 | node = _Chain_Next( node ); |
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262 | |
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263 | while ( node != tail ) { |
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264 | scheduler_node = SCHEDULER_NODE_OF_THREAD_SCHEDULER_NODE( node ); |
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265 | scheduler = _Scheduler_Node_get_scheduler( scheduler_node ); |
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266 | |
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267 | _Scheduler_Acquire_critical( scheduler, &lock_context ); |
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268 | ( *scheduler->Operations.withdraw_node )( |
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269 | scheduler, |
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270 | the_thread, |
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271 | scheduler_node, |
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272 | THREAD_SCHEDULER_BLOCKED |
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273 | ); |
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274 | _Scheduler_Release_critical( scheduler, &lock_context ); |
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275 | |
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276 | node = _Chain_Next( node ); |
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277 | } |
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278 | #else |
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279 | const Scheduler_Control *scheduler; |
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280 | |
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281 | scheduler = _Thread_Scheduler_get_home( the_thread ); |
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282 | ( *scheduler->Operations.block )( |
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283 | scheduler, |
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284 | the_thread, |
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285 | _Thread_Scheduler_get_home_node( the_thread ) |
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286 | ); |
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287 | #endif |
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288 | } |
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289 | |
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290 | /** |
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291 | * @brief Unblocks a thread with respect to the scheduler. |
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292 | * |
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293 | * This operation must fetch the latest thread priority value for this |
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294 | * scheduler instance and update its internal state if necessary. |
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295 | * |
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296 | * @param[in] the_thread The thread. |
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297 | * |
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298 | * @see _Scheduler_Node_get_priority(). |
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299 | */ |
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300 | RTEMS_INLINE_ROUTINE void _Scheduler_Unblock( Thread_Control *the_thread ) |
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301 | { |
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302 | const Scheduler_Control *scheduler; |
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303 | ISR_lock_Context lock_context; |
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304 | |
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305 | scheduler = _Thread_Scheduler_get_home( the_thread ); |
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306 | _Scheduler_Acquire_critical( scheduler, &lock_context ); |
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307 | ( *scheduler->Operations.unblock )( |
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308 | scheduler, |
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309 | the_thread, |
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310 | _Thread_Scheduler_get_home_node( the_thread ) |
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311 | ); |
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312 | _Scheduler_Release_critical( scheduler, &lock_context ); |
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313 | } |
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314 | |
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315 | /** |
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316 | * @brief Propagates a priority change of a thread to the scheduler. |
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317 | * |
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318 | * On uni-processor configurations, this operation must evaluate the thread |
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319 | * state. In case the thread is not ready, then the priority update should be |
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320 | * deferred to the next scheduler unblock operation. |
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321 | * |
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322 | * The operation must update the heir and thread dispatch necessary variables |
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323 | * in case the set of scheduled threads changes. |
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324 | * |
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325 | * @param[in] the_thread The thread changing its priority. |
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326 | * |
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327 | * @see _Scheduler_Node_get_priority(). |
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328 | */ |
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329 | RTEMS_INLINE_ROUTINE void _Scheduler_Update_priority( Thread_Control *the_thread ) |
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330 | { |
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331 | #if defined(RTEMS_SMP) |
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332 | Chain_Node *node; |
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333 | const Chain_Node *tail; |
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334 | |
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335 | _Thread_Scheduler_process_requests( the_thread ); |
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336 | |
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337 | node = _Chain_First( &the_thread->Scheduler.Scheduler_nodes ); |
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338 | tail = _Chain_Immutable_tail( &the_thread->Scheduler.Scheduler_nodes ); |
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339 | |
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340 | do { |
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341 | Scheduler_Node *scheduler_node; |
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342 | const Scheduler_Control *scheduler; |
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343 | ISR_lock_Context lock_context; |
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344 | |
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345 | scheduler_node = SCHEDULER_NODE_OF_THREAD_SCHEDULER_NODE( node ); |
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346 | scheduler = _Scheduler_Node_get_scheduler( scheduler_node ); |
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347 | |
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348 | _Scheduler_Acquire_critical( scheduler, &lock_context ); |
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349 | ( *scheduler->Operations.update_priority )( |
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350 | scheduler, |
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351 | the_thread, |
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352 | scheduler_node |
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353 | ); |
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354 | _Scheduler_Release_critical( scheduler, &lock_context ); |
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355 | |
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356 | node = _Chain_Next( node ); |
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357 | } while ( node != tail ); |
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358 | #else |
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359 | const Scheduler_Control *scheduler; |
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360 | |
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361 | scheduler = _Thread_Scheduler_get_home( the_thread ); |
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362 | ( *scheduler->Operations.update_priority )( |
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363 | scheduler, |
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364 | the_thread, |
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365 | _Thread_Scheduler_get_home_node( the_thread ) |
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366 | ); |
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367 | #endif |
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368 | } |
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369 | |
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370 | #if defined(RTEMS_SMP) |
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371 | /** |
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372 | * @brief Changes the sticky level of the home scheduler node and propagates a |
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373 | * priority change of a thread to the scheduler. |
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374 | * |
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375 | * @param[in] the_thread The thread changing its priority or sticky level. |
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376 | * |
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377 | * @see _Scheduler_Update_priority(). |
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378 | */ |
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379 | RTEMS_INLINE_ROUTINE void _Scheduler_Priority_and_sticky_update( |
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380 | Thread_Control *the_thread, |
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381 | int sticky_level_change |
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382 | ) |
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383 | { |
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384 | Chain_Node *node; |
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385 | const Chain_Node *tail; |
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386 | Scheduler_Node *scheduler_node; |
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387 | const Scheduler_Control *scheduler; |
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388 | ISR_lock_Context lock_context; |
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389 | |
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390 | _Thread_Scheduler_process_requests( the_thread ); |
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391 | |
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392 | node = _Chain_First( &the_thread->Scheduler.Scheduler_nodes ); |
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393 | scheduler_node = SCHEDULER_NODE_OF_THREAD_SCHEDULER_NODE( node ); |
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394 | scheduler = _Scheduler_Node_get_scheduler( scheduler_node ); |
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395 | |
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396 | _Scheduler_Acquire_critical( scheduler, &lock_context ); |
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397 | |
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398 | scheduler_node->sticky_level += sticky_level_change; |
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399 | _Assert( scheduler_node->sticky_level >= 0 ); |
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400 | |
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401 | ( *scheduler->Operations.update_priority )( |
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402 | scheduler, |
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403 | the_thread, |
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404 | scheduler_node |
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405 | ); |
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406 | |
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407 | _Scheduler_Release_critical( scheduler, &lock_context ); |
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408 | |
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409 | tail = _Chain_Immutable_tail( &the_thread->Scheduler.Scheduler_nodes ); |
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410 | node = _Chain_Next( node ); |
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411 | |
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412 | while ( node != tail ) { |
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413 | scheduler_node = SCHEDULER_NODE_OF_THREAD_SCHEDULER_NODE( node ); |
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414 | scheduler = _Scheduler_Node_get_scheduler( scheduler_node ); |
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415 | |
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416 | _Scheduler_Acquire_critical( scheduler, &lock_context ); |
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417 | ( *scheduler->Operations.update_priority )( |
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418 | scheduler, |
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419 | the_thread, |
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420 | scheduler_node |
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421 | ); |
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422 | _Scheduler_Release_critical( scheduler, &lock_context ); |
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423 | |
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424 | node = _Chain_Next( node ); |
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425 | } |
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426 | } |
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427 | #endif |
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428 | |
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429 | /** |
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430 | * @brief Maps a thread priority from the user domain to the scheduler domain. |
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431 | * |
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432 | * Let M be the maximum scheduler priority. The mapping must be bijective in |
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433 | * the closed interval [0, M], e.g. _Scheduler_Unmap_priority( scheduler, |
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434 | * _Scheduler_Map_priority( scheduler, p ) ) == p for all p in [0, M]. For |
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435 | * other values the mapping is undefined. |
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436 | * |
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437 | * @param[in] scheduler The scheduler instance. |
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438 | * @param[in] priority The user domain thread priority. |
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439 | * |
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440 | * @return The corresponding thread priority of the scheduler domain is returned. |
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441 | */ |
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442 | RTEMS_INLINE_ROUTINE Priority_Control _Scheduler_Map_priority( |
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443 | const Scheduler_Control *scheduler, |
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444 | Priority_Control priority |
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445 | ) |
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446 | { |
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447 | return ( *scheduler->Operations.map_priority )( scheduler, priority ); |
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448 | } |
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449 | |
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450 | /** |
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451 | * @brief Unmaps a thread priority from the scheduler domain to the user domain. |
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452 | * |
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453 | * @param[in] scheduler The scheduler instance. |
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454 | * @param[in] priority The scheduler domain thread priority. |
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455 | * |
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456 | * @return The corresponding thread priority of the user domain is returned. |
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457 | */ |
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458 | RTEMS_INLINE_ROUTINE Priority_Control _Scheduler_Unmap_priority( |
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459 | const Scheduler_Control *scheduler, |
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460 | Priority_Control priority |
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461 | ) |
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462 | { |
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463 | return ( *scheduler->Operations.unmap_priority )( scheduler, priority ); |
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464 | } |
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465 | |
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466 | /** |
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467 | * @brief Initializes a scheduler node. |
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468 | * |
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469 | * The scheduler node contains arbitrary data on function entry. The caller |
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470 | * must ensure that _Scheduler_Node_destroy() will be called after a |
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471 | * _Scheduler_Node_initialize() before the memory of the scheduler node is |
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472 | * destroyed. |
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473 | * |
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474 | * @param[in] scheduler The scheduler instance. |
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475 | * @param[in] node The scheduler node to initialize. |
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476 | * @param[in] the_thread The thread of the scheduler node to initialize. |
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477 | * @param[in] priority The thread priority. |
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478 | */ |
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479 | RTEMS_INLINE_ROUTINE void _Scheduler_Node_initialize( |
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480 | const Scheduler_Control *scheduler, |
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481 | Scheduler_Node *node, |
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482 | Thread_Control *the_thread, |
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483 | Priority_Control priority |
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484 | ) |
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485 | { |
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486 | ( *scheduler->Operations.node_initialize )( |
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487 | scheduler, |
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488 | node, |
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489 | the_thread, |
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490 | priority |
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491 | ); |
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492 | } |
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493 | |
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494 | /** |
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495 | * @brief Destroys a scheduler node. |
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496 | * |
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497 | * The caller must ensure that _Scheduler_Node_destroy() will be called only |
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498 | * after a corresponding _Scheduler_Node_initialize(). |
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499 | * |
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500 | * @param[in] scheduler The scheduler instance. |
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501 | * @param[in] node The scheduler node to destroy. |
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502 | */ |
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503 | RTEMS_INLINE_ROUTINE void _Scheduler_Node_destroy( |
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504 | const Scheduler_Control *scheduler, |
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505 | Scheduler_Node *node |
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506 | ) |
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507 | { |
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508 | ( *scheduler->Operations.node_destroy )( scheduler, node ); |
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509 | } |
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510 | |
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511 | /** |
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512 | * @brief Releases a job of a thread with respect to the scheduler. |
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513 | * |
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514 | * @param[in] the_thread The thread. |
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515 | * @param[in] priority_node The priority node of the job. |
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516 | * @param[in] deadline The deadline in watchdog ticks since boot. |
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517 | * @param[in] queue_context The thread queue context to provide the set of |
---|
518 | * threads for _Thread_Priority_update(). |
---|
519 | */ |
---|
520 | RTEMS_INLINE_ROUTINE void _Scheduler_Release_job( |
---|
521 | Thread_Control *the_thread, |
---|
522 | Priority_Node *priority_node, |
---|
523 | uint64_t deadline, |
---|
524 | Thread_queue_Context *queue_context |
---|
525 | ) |
---|
526 | { |
---|
527 | const Scheduler_Control *scheduler = _Thread_Scheduler_get_home( the_thread ); |
---|
528 | |
---|
529 | _Thread_queue_Context_clear_priority_updates( queue_context ); |
---|
530 | ( *scheduler->Operations.release_job )( |
---|
531 | scheduler, |
---|
532 | the_thread, |
---|
533 | priority_node, |
---|
534 | deadline, |
---|
535 | queue_context |
---|
536 | ); |
---|
537 | } |
---|
538 | |
---|
539 | /** |
---|
540 | * @brief Cancels a job of a thread with respect to the scheduler. |
---|
541 | * |
---|
542 | * @param[in] the_thread The thread. |
---|
543 | * @param[in] priority_node The priority node of the job. |
---|
544 | * @param[in] queue_context The thread queue context to provide the set of |
---|
545 | * threads for _Thread_Priority_update(). |
---|
546 | */ |
---|
547 | RTEMS_INLINE_ROUTINE void _Scheduler_Cancel_job( |
---|
548 | Thread_Control *the_thread, |
---|
549 | Priority_Node *priority_node, |
---|
550 | Thread_queue_Context *queue_context |
---|
551 | ) |
---|
552 | { |
---|
553 | const Scheduler_Control *scheduler = _Thread_Scheduler_get_home( the_thread ); |
---|
554 | |
---|
555 | _Thread_queue_Context_clear_priority_updates( queue_context ); |
---|
556 | ( *scheduler->Operations.cancel_job )( |
---|
557 | scheduler, |
---|
558 | the_thread, |
---|
559 | priority_node, |
---|
560 | queue_context |
---|
561 | ); |
---|
562 | } |
---|
563 | |
---|
564 | /** |
---|
565 | * @brief Scheduler method invoked at each clock tick. |
---|
566 | * |
---|
567 | * This method is invoked at each clock tick to allow the scheduler |
---|
568 | * implementation to perform any activities required. For the |
---|
569 | * scheduler which support standard RTEMS features, this includes |
---|
570 | * time-slicing management. |
---|
571 | */ |
---|
572 | RTEMS_INLINE_ROUTINE void _Scheduler_Tick( const Per_CPU_Control *cpu ) |
---|
573 | { |
---|
574 | const Scheduler_Control *scheduler = _Scheduler_Get_by_CPU( cpu ); |
---|
575 | Thread_Control *executing = cpu->executing; |
---|
576 | |
---|
577 | if ( scheduler != NULL && executing != NULL ) { |
---|
578 | ( *scheduler->Operations.tick )( scheduler, executing ); |
---|
579 | } |
---|
580 | } |
---|
581 | |
---|
582 | /** |
---|
583 | * @brief Starts the idle thread for a particular processor. |
---|
584 | * |
---|
585 | * @param[in] scheduler The scheduler instance. |
---|
586 | * @param[in,out] the_thread The idle thread for the processor. |
---|
587 | * @param[in,out] cpu The processor for the idle thread. |
---|
588 | * |
---|
589 | * @see _Thread_Create_idle(). |
---|
590 | */ |
---|
591 | RTEMS_INLINE_ROUTINE void _Scheduler_Start_idle( |
---|
592 | const Scheduler_Control *scheduler, |
---|
593 | Thread_Control *the_thread, |
---|
594 | Per_CPU_Control *cpu |
---|
595 | ) |
---|
596 | { |
---|
597 | ( *scheduler->Operations.start_idle )( scheduler, the_thread, cpu ); |
---|
598 | } |
---|
599 | |
---|
600 | RTEMS_INLINE_ROUTINE bool _Scheduler_Has_processor_ownership( |
---|
601 | const Scheduler_Control *scheduler, |
---|
602 | uint32_t cpu_index |
---|
603 | ) |
---|
604 | { |
---|
605 | #if defined(RTEMS_SMP) |
---|
606 | const Per_CPU_Control *cpu; |
---|
607 | const Scheduler_Control *scheduler_of_cpu; |
---|
608 | |
---|
609 | cpu = _Per_CPU_Get_by_index( cpu_index ); |
---|
610 | scheduler_of_cpu = _Scheduler_Get_by_CPU( cpu ); |
---|
611 | |
---|
612 | return scheduler_of_cpu == scheduler; |
---|
613 | #else |
---|
614 | (void) scheduler; |
---|
615 | (void) cpu_index; |
---|
616 | |
---|
617 | return true; |
---|
618 | #endif |
---|
619 | } |
---|
620 | |
---|
621 | RTEMS_INLINE_ROUTINE const Processor_mask *_Scheduler_Get_processors( |
---|
622 | const Scheduler_Control *scheduler |
---|
623 | ) |
---|
624 | { |
---|
625 | #if defined(RTEMS_SMP) |
---|
626 | return &_Scheduler_Get_context( scheduler )->Processors; |
---|
627 | #else |
---|
628 | return &_Processor_mask_The_one_and_only; |
---|
629 | #endif |
---|
630 | } |
---|
631 | |
---|
632 | bool _Scheduler_Get_affinity( |
---|
633 | Thread_Control *the_thread, |
---|
634 | size_t cpusetsize, |
---|
635 | cpu_set_t *cpuset |
---|
636 | ); |
---|
637 | |
---|
638 | RTEMS_INLINE_ROUTINE bool _Scheduler_default_Set_affinity_body( |
---|
639 | const Scheduler_Control *scheduler, |
---|
640 | Thread_Control *the_thread, |
---|
641 | Scheduler_Node *node, |
---|
642 | const Processor_mask *affinity |
---|
643 | ) |
---|
644 | { |
---|
645 | (void) scheduler; |
---|
646 | (void) the_thread; |
---|
647 | (void) node; |
---|
648 | return _Processor_mask_Is_subset( affinity, _SMP_Get_online_processors() ); |
---|
649 | } |
---|
650 | |
---|
651 | bool _Scheduler_Set_affinity( |
---|
652 | Thread_Control *the_thread, |
---|
653 | size_t cpusetsize, |
---|
654 | const cpu_set_t *cpuset |
---|
655 | ); |
---|
656 | |
---|
657 | RTEMS_INLINE_ROUTINE void _Scheduler_Generic_block( |
---|
658 | const Scheduler_Control *scheduler, |
---|
659 | Thread_Control *the_thread, |
---|
660 | Scheduler_Node *node, |
---|
661 | void ( *extract )( |
---|
662 | const Scheduler_Control *, |
---|
663 | Thread_Control *, |
---|
664 | Scheduler_Node * |
---|
665 | ), |
---|
666 | void ( *schedule )( |
---|
667 | const Scheduler_Control *, |
---|
668 | Thread_Control *, |
---|
669 | bool |
---|
670 | ) |
---|
671 | ) |
---|
672 | { |
---|
673 | ( *extract )( scheduler, the_thread, node ); |
---|
674 | |
---|
675 | /* TODO: flash critical section? */ |
---|
676 | |
---|
677 | if ( _Thread_Is_executing( the_thread ) || _Thread_Is_heir( the_thread ) ) { |
---|
678 | ( *schedule )( scheduler, the_thread, true ); |
---|
679 | } |
---|
680 | } |
---|
681 | |
---|
682 | RTEMS_INLINE_ROUTINE uint32_t _Scheduler_Get_processor_count( |
---|
683 | const Scheduler_Control *scheduler |
---|
684 | ) |
---|
685 | { |
---|
686 | #if defined(RTEMS_SMP) |
---|
687 | const Scheduler_Context *context = _Scheduler_Get_context( scheduler ); |
---|
688 | |
---|
689 | return _Processor_mask_Count( &context->Processors ); |
---|
690 | #else |
---|
691 | (void) scheduler; |
---|
692 | |
---|
693 | return 1; |
---|
694 | #endif |
---|
695 | } |
---|
696 | |
---|
697 | RTEMS_INLINE_ROUTINE Objects_Id _Scheduler_Build_id( uint32_t scheduler_index ) |
---|
698 | { |
---|
699 | return _Objects_Build_id( |
---|
700 | OBJECTS_FAKE_OBJECTS_API, |
---|
701 | OBJECTS_FAKE_OBJECTS_SCHEDULERS, |
---|
702 | _Objects_Local_node, |
---|
703 | (uint16_t) ( scheduler_index + 1 ) |
---|
704 | ); |
---|
705 | } |
---|
706 | |
---|
707 | RTEMS_INLINE_ROUTINE uint32_t _Scheduler_Get_index_by_id( Objects_Id id ) |
---|
708 | { |
---|
709 | uint32_t minimum_id = _Scheduler_Build_id( 0 ); |
---|
710 | |
---|
711 | return id - minimum_id; |
---|
712 | } |
---|
713 | |
---|
714 | RTEMS_INLINE_ROUTINE const Scheduler_Control *_Scheduler_Get_by_id( |
---|
715 | Objects_Id id |
---|
716 | ) |
---|
717 | { |
---|
718 | uint32_t index; |
---|
719 | |
---|
720 | index = _Scheduler_Get_index_by_id( id ); |
---|
721 | |
---|
722 | if ( index >= _Scheduler_Count ) { |
---|
723 | return NULL; |
---|
724 | } |
---|
725 | |
---|
726 | return &_Scheduler_Table[ index ]; |
---|
727 | } |
---|
728 | |
---|
729 | RTEMS_INLINE_ROUTINE uint32_t _Scheduler_Get_index( |
---|
730 | const Scheduler_Control *scheduler |
---|
731 | ) |
---|
732 | { |
---|
733 | return (uint32_t) (scheduler - &_Scheduler_Table[ 0 ]); |
---|
734 | } |
---|
735 | |
---|
736 | #if defined(RTEMS_SMP) |
---|
737 | /** |
---|
738 | * @brief Gets an idle thread from the scheduler instance. |
---|
739 | * |
---|
740 | * @param[in] context The scheduler instance context. |
---|
741 | * |
---|
742 | * @retval idle An idle thread for use. This function must always return an |
---|
743 | * idle thread. If none is available, then this is a fatal error. |
---|
744 | */ |
---|
745 | typedef Thread_Control *( *Scheduler_Get_idle_thread )( |
---|
746 | Scheduler_Context *context |
---|
747 | ); |
---|
748 | |
---|
749 | /** |
---|
750 | * @brief Releases an idle thread to the scheduler instance for reuse. |
---|
751 | * |
---|
752 | * @param[in] context The scheduler instance context. |
---|
753 | * @param[in] idle The idle thread to release |
---|
754 | */ |
---|
755 | typedef void ( *Scheduler_Release_idle_thread )( |
---|
756 | Scheduler_Context *context, |
---|
757 | Thread_Control *idle |
---|
758 | ); |
---|
759 | |
---|
760 | RTEMS_INLINE_ROUTINE void _Scheduler_Thread_change_state( |
---|
761 | Thread_Control *the_thread, |
---|
762 | Thread_Scheduler_state new_state |
---|
763 | ) |
---|
764 | { |
---|
765 | _Assert( |
---|
766 | _ISR_lock_Is_owner( &the_thread->Scheduler.Lock ) |
---|
767 | || the_thread->Scheduler.state == THREAD_SCHEDULER_BLOCKED |
---|
768 | || !_System_state_Is_up( _System_state_Get() ) |
---|
769 | ); |
---|
770 | |
---|
771 | the_thread->Scheduler.state = new_state; |
---|
772 | } |
---|
773 | |
---|
774 | RTEMS_INLINE_ROUTINE void _Scheduler_Set_idle_thread( |
---|
775 | Scheduler_Node *node, |
---|
776 | Thread_Control *idle |
---|
777 | ) |
---|
778 | { |
---|
779 | _Assert( _Scheduler_Node_get_idle( node ) == NULL ); |
---|
780 | _Assert( |
---|
781 | _Scheduler_Node_get_owner( node ) == _Scheduler_Node_get_user( node ) |
---|
782 | ); |
---|
783 | |
---|
784 | _Scheduler_Node_set_user( node, idle ); |
---|
785 | node->idle = idle; |
---|
786 | } |
---|
787 | |
---|
788 | /** |
---|
789 | * @brief Use an idle thread for this scheduler node. |
---|
790 | * |
---|
791 | * A thread those home scheduler node has a sticky level greater than zero may |
---|
792 | * use an idle thread in the home scheduler instance in case it executes |
---|
793 | * currently in another scheduler instance or in case it is in a blocking |
---|
794 | * state. |
---|
795 | * |
---|
796 | * @param[in] context The scheduler instance context. |
---|
797 | * @param[in] node The node which wants to use the idle thread. |
---|
798 | * @param[in] cpu The processor for the idle thread. |
---|
799 | * @param[in] get_idle_thread Function to get an idle thread. |
---|
800 | */ |
---|
801 | RTEMS_INLINE_ROUTINE Thread_Control *_Scheduler_Use_idle_thread( |
---|
802 | Scheduler_Context *context, |
---|
803 | Scheduler_Node *node, |
---|
804 | Per_CPU_Control *cpu, |
---|
805 | Scheduler_Get_idle_thread get_idle_thread |
---|
806 | ) |
---|
807 | { |
---|
808 | Thread_Control *idle = ( *get_idle_thread )( context ); |
---|
809 | |
---|
810 | _Scheduler_Set_idle_thread( node, idle ); |
---|
811 | _Thread_Set_CPU( idle, cpu ); |
---|
812 | return idle; |
---|
813 | } |
---|
814 | |
---|
815 | typedef enum { |
---|
816 | SCHEDULER_TRY_TO_SCHEDULE_DO_SCHEDULE, |
---|
817 | SCHEDULER_TRY_TO_SCHEDULE_DO_IDLE_EXCHANGE, |
---|
818 | SCHEDULER_TRY_TO_SCHEDULE_DO_BLOCK |
---|
819 | } Scheduler_Try_to_schedule_action; |
---|
820 | |
---|
821 | /** |
---|
822 | * @brief Try to schedule this scheduler node. |
---|
823 | * |
---|
824 | * @param[in] context The scheduler instance context. |
---|
825 | * @param[in] node The node which wants to get scheduled. |
---|
826 | * @param[in] idle A potential idle thread used by a potential victim node. |
---|
827 | * @param[in] get_idle_thread Function to get an idle thread. |
---|
828 | * |
---|
829 | * @retval true This node can be scheduled. |
---|
830 | * @retval false Otherwise. |
---|
831 | */ |
---|
832 | RTEMS_INLINE_ROUTINE Scheduler_Try_to_schedule_action |
---|
833 | _Scheduler_Try_to_schedule_node( |
---|
834 | Scheduler_Context *context, |
---|
835 | Scheduler_Node *node, |
---|
836 | Thread_Control *idle, |
---|
837 | Scheduler_Get_idle_thread get_idle_thread |
---|
838 | ) |
---|
839 | { |
---|
840 | ISR_lock_Context lock_context; |
---|
841 | Scheduler_Try_to_schedule_action action; |
---|
842 | Thread_Control *owner; |
---|
843 | |
---|
844 | action = SCHEDULER_TRY_TO_SCHEDULE_DO_SCHEDULE; |
---|
845 | owner = _Scheduler_Node_get_owner( node ); |
---|
846 | _Assert( _Scheduler_Node_get_user( node ) == owner ); |
---|
847 | _Assert( _Scheduler_Node_get_idle( node ) == NULL ); |
---|
848 | |
---|
849 | _Thread_Scheduler_acquire_critical( owner, &lock_context ); |
---|
850 | |
---|
851 | if ( owner->Scheduler.state == THREAD_SCHEDULER_READY ) { |
---|
852 | _Thread_Scheduler_cancel_need_for_help( owner, _Thread_Get_CPU( owner ) ); |
---|
853 | _Scheduler_Thread_change_state( owner, THREAD_SCHEDULER_SCHEDULED ); |
---|
854 | } else if ( |
---|
855 | owner->Scheduler.state == THREAD_SCHEDULER_SCHEDULED |
---|
856 | && node->sticky_level <= 1 |
---|
857 | ) { |
---|
858 | action = SCHEDULER_TRY_TO_SCHEDULE_DO_BLOCK; |
---|
859 | } else if ( node->sticky_level == 0 ) { |
---|
860 | action = SCHEDULER_TRY_TO_SCHEDULE_DO_BLOCK; |
---|
861 | } else if ( idle != NULL ) { |
---|
862 | action = SCHEDULER_TRY_TO_SCHEDULE_DO_IDLE_EXCHANGE; |
---|
863 | } else { |
---|
864 | _Scheduler_Use_idle_thread( |
---|
865 | context, |
---|
866 | node, |
---|
867 | _Thread_Get_CPU( owner ), |
---|
868 | get_idle_thread |
---|
869 | ); |
---|
870 | } |
---|
871 | |
---|
872 | _Thread_Scheduler_release_critical( owner, &lock_context ); |
---|
873 | return action; |
---|
874 | } |
---|
875 | |
---|
876 | /** |
---|
877 | * @brief Release an idle thread using this scheduler node. |
---|
878 | * |
---|
879 | * @param[in] context The scheduler instance context. |
---|
880 | * @param[in] node The node which may have an idle thread as user. |
---|
881 | * @param[in] release_idle_thread Function to release an idle thread. |
---|
882 | * |
---|
883 | * @retval idle The idle thread which used this node. |
---|
884 | * @retval NULL This node had no idle thread as an user. |
---|
885 | */ |
---|
886 | RTEMS_INLINE_ROUTINE Thread_Control *_Scheduler_Release_idle_thread( |
---|
887 | Scheduler_Context *context, |
---|
888 | Scheduler_Node *node, |
---|
889 | Scheduler_Release_idle_thread release_idle_thread |
---|
890 | ) |
---|
891 | { |
---|
892 | Thread_Control *idle = _Scheduler_Node_get_idle( node ); |
---|
893 | |
---|
894 | if ( idle != NULL ) { |
---|
895 | Thread_Control *owner = _Scheduler_Node_get_owner( node ); |
---|
896 | |
---|
897 | node->idle = NULL; |
---|
898 | _Scheduler_Node_set_user( node, owner ); |
---|
899 | ( *release_idle_thread )( context, idle ); |
---|
900 | } |
---|
901 | |
---|
902 | return idle; |
---|
903 | } |
---|
904 | |
---|
905 | RTEMS_INLINE_ROUTINE void _Scheduler_Exchange_idle_thread( |
---|
906 | Scheduler_Node *needs_idle, |
---|
907 | Scheduler_Node *uses_idle, |
---|
908 | Thread_Control *idle |
---|
909 | ) |
---|
910 | { |
---|
911 | uses_idle->idle = NULL; |
---|
912 | _Scheduler_Node_set_user( |
---|
913 | uses_idle, |
---|
914 | _Scheduler_Node_get_owner( uses_idle ) |
---|
915 | ); |
---|
916 | _Scheduler_Set_idle_thread( needs_idle, idle ); |
---|
917 | } |
---|
918 | |
---|
919 | /** |
---|
920 | * @brief Block this scheduler node. |
---|
921 | * |
---|
922 | * @param[in] context The scheduler instance context. |
---|
923 | * @param[in] thread The thread which wants to get blocked referencing this |
---|
924 | * node. This is not necessarily the user of this node in case the node |
---|
925 | * participates in the scheduler helping protocol. |
---|
926 | * @param[in] node The node which wants to get blocked. |
---|
927 | * @param[in] is_scheduled This node is scheduled. |
---|
928 | * @param[in] get_idle_thread Function to get an idle thread. |
---|
929 | * |
---|
930 | * @retval thread_cpu The processor of the thread. Indicates to continue with |
---|
931 | * the blocking operation. |
---|
932 | * @retval NULL Otherwise. |
---|
933 | */ |
---|
934 | RTEMS_INLINE_ROUTINE Per_CPU_Control *_Scheduler_Block_node( |
---|
935 | Scheduler_Context *context, |
---|
936 | Thread_Control *thread, |
---|
937 | Scheduler_Node *node, |
---|
938 | bool is_scheduled, |
---|
939 | Scheduler_Get_idle_thread get_idle_thread |
---|
940 | ) |
---|
941 | { |
---|
942 | int sticky_level; |
---|
943 | ISR_lock_Context lock_context; |
---|
944 | Per_CPU_Control *thread_cpu; |
---|
945 | |
---|
946 | sticky_level = node->sticky_level; |
---|
947 | --sticky_level; |
---|
948 | node->sticky_level = sticky_level; |
---|
949 | _Assert( sticky_level >= 0 ); |
---|
950 | |
---|
951 | _Thread_Scheduler_acquire_critical( thread, &lock_context ); |
---|
952 | thread_cpu = _Thread_Get_CPU( thread ); |
---|
953 | _Thread_Scheduler_cancel_need_for_help( thread, thread_cpu ); |
---|
954 | _Scheduler_Thread_change_state( thread, THREAD_SCHEDULER_BLOCKED ); |
---|
955 | _Thread_Scheduler_release_critical( thread, &lock_context ); |
---|
956 | |
---|
957 | if ( sticky_level > 0 ) { |
---|
958 | if ( is_scheduled && _Scheduler_Node_get_idle( node ) == NULL ) { |
---|
959 | Thread_Control *idle; |
---|
960 | |
---|
961 | idle = _Scheduler_Use_idle_thread( |
---|
962 | context, |
---|
963 | node, |
---|
964 | thread_cpu, |
---|
965 | get_idle_thread |
---|
966 | ); |
---|
967 | _Thread_Dispatch_update_heir( _Per_CPU_Get(), thread_cpu, idle ); |
---|
968 | } |
---|
969 | |
---|
970 | return NULL; |
---|
971 | } |
---|
972 | |
---|
973 | _Assert( thread == _Scheduler_Node_get_user( node ) ); |
---|
974 | return thread_cpu; |
---|
975 | } |
---|
976 | |
---|
977 | RTEMS_INLINE_ROUTINE void _Scheduler_Discard_idle_thread( |
---|
978 | Scheduler_Context *context, |
---|
979 | Thread_Control *the_thread, |
---|
980 | Scheduler_Node *node, |
---|
981 | Scheduler_Release_idle_thread release_idle_thread |
---|
982 | ) |
---|
983 | { |
---|
984 | Thread_Control *idle; |
---|
985 | Thread_Control *owner; |
---|
986 | Per_CPU_Control *cpu; |
---|
987 | |
---|
988 | idle = _Scheduler_Node_get_idle( node ); |
---|
989 | owner = _Scheduler_Node_get_owner( node ); |
---|
990 | |
---|
991 | node->idle = NULL; |
---|
992 | _Assert( _Scheduler_Node_get_user( node ) == idle ); |
---|
993 | _Scheduler_Node_set_user( node, owner ); |
---|
994 | ( *release_idle_thread )( context, idle ); |
---|
995 | |
---|
996 | cpu = _Thread_Get_CPU( idle ); |
---|
997 | _Thread_Set_CPU( the_thread, cpu ); |
---|
998 | _Thread_Dispatch_update_heir( _Per_CPU_Get(), cpu, the_thread ); |
---|
999 | } |
---|
1000 | |
---|
1001 | /** |
---|
1002 | * @brief Unblock this scheduler node. |
---|
1003 | * |
---|
1004 | * @param[in] context The scheduler instance context. |
---|
1005 | * @param[in] the_thread The thread which wants to get unblocked. |
---|
1006 | * @param[in] node The node which wants to get unblocked. |
---|
1007 | * @param[in] is_scheduled This node is scheduled. |
---|
1008 | * @param[in] release_idle_thread Function to release an idle thread. |
---|
1009 | * |
---|
1010 | * @retval true Continue with the unblocking operation. |
---|
1011 | * @retval false Otherwise. |
---|
1012 | */ |
---|
1013 | RTEMS_INLINE_ROUTINE bool _Scheduler_Unblock_node( |
---|
1014 | Scheduler_Context *context, |
---|
1015 | Thread_Control *the_thread, |
---|
1016 | Scheduler_Node *node, |
---|
1017 | bool is_scheduled, |
---|
1018 | Scheduler_Release_idle_thread release_idle_thread |
---|
1019 | ) |
---|
1020 | { |
---|
1021 | bool unblock; |
---|
1022 | |
---|
1023 | ++node->sticky_level; |
---|
1024 | _Assert( node->sticky_level > 0 ); |
---|
1025 | |
---|
1026 | if ( is_scheduled ) { |
---|
1027 | _Scheduler_Discard_idle_thread( |
---|
1028 | context, |
---|
1029 | the_thread, |
---|
1030 | node, |
---|
1031 | release_idle_thread |
---|
1032 | ); |
---|
1033 | _Scheduler_Thread_change_state( the_thread, THREAD_SCHEDULER_SCHEDULED ); |
---|
1034 | unblock = false; |
---|
1035 | } else { |
---|
1036 | _Scheduler_Thread_change_state( the_thread, THREAD_SCHEDULER_READY ); |
---|
1037 | unblock = true; |
---|
1038 | } |
---|
1039 | |
---|
1040 | return unblock; |
---|
1041 | } |
---|
1042 | #endif |
---|
1043 | |
---|
1044 | RTEMS_INLINE_ROUTINE void _Scheduler_Update_heir( |
---|
1045 | Thread_Control *new_heir, |
---|
1046 | bool force_dispatch |
---|
1047 | ) |
---|
1048 | { |
---|
1049 | Thread_Control *heir = _Thread_Heir; |
---|
1050 | |
---|
1051 | if ( heir != new_heir && ( heir->is_preemptible || force_dispatch ) ) { |
---|
1052 | #if defined(RTEMS_SMP) |
---|
1053 | /* |
---|
1054 | * We need this state only for _Thread_Get_CPU_time_used(). Cannot use |
---|
1055 | * _Scheduler_Thread_change_state() since THREAD_SCHEDULER_BLOCKED to |
---|
1056 | * THREAD_SCHEDULER_BLOCKED state changes are illegal for the real SMP |
---|
1057 | * schedulers. |
---|
1058 | */ |
---|
1059 | heir->Scheduler.state = THREAD_SCHEDULER_BLOCKED; |
---|
1060 | new_heir->Scheduler.state = THREAD_SCHEDULER_SCHEDULED; |
---|
1061 | #endif |
---|
1062 | _Thread_Update_CPU_time_used( heir, _Thread_Get_CPU( heir ) ); |
---|
1063 | _Thread_Heir = new_heir; |
---|
1064 | _Thread_Dispatch_necessary = true; |
---|
1065 | } |
---|
1066 | } |
---|
1067 | |
---|
1068 | RTEMS_INLINE_ROUTINE Status_Control _Scheduler_Set( |
---|
1069 | const Scheduler_Control *new_scheduler, |
---|
1070 | Thread_Control *the_thread, |
---|
1071 | Priority_Control priority |
---|
1072 | ) |
---|
1073 | { |
---|
1074 | Scheduler_Node *new_scheduler_node; |
---|
1075 | Scheduler_Node *old_scheduler_node; |
---|
1076 | #if defined(RTEMS_SMP) |
---|
1077 | ISR_lock_Context lock_context; |
---|
1078 | const Scheduler_Control *old_scheduler; |
---|
1079 | |
---|
1080 | #endif |
---|
1081 | |
---|
1082 | if ( the_thread->Wait.queue != NULL ) { |
---|
1083 | return STATUS_RESOURCE_IN_USE; |
---|
1084 | } |
---|
1085 | |
---|
1086 | old_scheduler_node = _Thread_Scheduler_get_home_node( the_thread ); |
---|
1087 | _Priority_Plain_extract( |
---|
1088 | &old_scheduler_node->Wait.Priority, |
---|
1089 | &the_thread->Real_priority |
---|
1090 | ); |
---|
1091 | |
---|
1092 | if ( !_Priority_Is_empty( &old_scheduler_node->Wait.Priority ) ) { |
---|
1093 | _Priority_Plain_insert( |
---|
1094 | &old_scheduler_node->Wait.Priority, |
---|
1095 | &the_thread->Real_priority, |
---|
1096 | the_thread->Real_priority.priority |
---|
1097 | ); |
---|
1098 | return STATUS_RESOURCE_IN_USE; |
---|
1099 | } |
---|
1100 | |
---|
1101 | #if defined(RTEMS_SMP) |
---|
1102 | if ( !_Chain_Has_only_one_node( &the_thread->Scheduler.Wait_nodes ) ) { |
---|
1103 | _Priority_Plain_insert( |
---|
1104 | &old_scheduler_node->Wait.Priority, |
---|
1105 | &the_thread->Real_priority, |
---|
1106 | the_thread->Real_priority.priority |
---|
1107 | ); |
---|
1108 | return STATUS_RESOURCE_IN_USE; |
---|
1109 | } |
---|
1110 | |
---|
1111 | old_scheduler = _Thread_Scheduler_get_home( the_thread ); |
---|
1112 | new_scheduler_node = _Thread_Scheduler_get_node_by_index( |
---|
1113 | the_thread, |
---|
1114 | _Scheduler_Get_index( new_scheduler ) |
---|
1115 | ); |
---|
1116 | |
---|
1117 | _Scheduler_Acquire_critical( new_scheduler, &lock_context ); |
---|
1118 | |
---|
1119 | if ( |
---|
1120 | _Scheduler_Get_processor_count( new_scheduler ) == 0 |
---|
1121 | || !( *new_scheduler->Operations.set_affinity )( |
---|
1122 | new_scheduler, |
---|
1123 | the_thread, |
---|
1124 | new_scheduler_node, |
---|
1125 | &the_thread->Scheduler.Affinity |
---|
1126 | ) |
---|
1127 | ) { |
---|
1128 | _Scheduler_Release_critical( new_scheduler, &lock_context ); |
---|
1129 | _Priority_Plain_insert( |
---|
1130 | &old_scheduler_node->Wait.Priority, |
---|
1131 | &the_thread->Real_priority, |
---|
1132 | the_thread->Real_priority.priority |
---|
1133 | ); |
---|
1134 | return STATUS_UNSATISFIED; |
---|
1135 | } |
---|
1136 | |
---|
1137 | the_thread->Scheduler.home = new_scheduler; |
---|
1138 | |
---|
1139 | _Scheduler_Release_critical( new_scheduler, &lock_context ); |
---|
1140 | |
---|
1141 | _Thread_Scheduler_process_requests( the_thread ); |
---|
1142 | #else |
---|
1143 | new_scheduler_node = old_scheduler_node; |
---|
1144 | #endif |
---|
1145 | |
---|
1146 | the_thread->Start.initial_priority = priority; |
---|
1147 | _Priority_Node_set_priority( &the_thread->Real_priority, priority ); |
---|
1148 | _Priority_Initialize_one( |
---|
1149 | &new_scheduler_node->Wait.Priority, |
---|
1150 | &the_thread->Real_priority |
---|
1151 | ); |
---|
1152 | |
---|
1153 | #if defined(RTEMS_SMP) |
---|
1154 | if ( old_scheduler != new_scheduler ) { |
---|
1155 | States_Control current_state; |
---|
1156 | |
---|
1157 | current_state = the_thread->current_state; |
---|
1158 | |
---|
1159 | if ( _States_Is_ready( current_state ) ) { |
---|
1160 | _Scheduler_Block( the_thread ); |
---|
1161 | } |
---|
1162 | |
---|
1163 | _Assert( old_scheduler_node->sticky_level == 0 ); |
---|
1164 | _Assert( new_scheduler_node->sticky_level == 0 ); |
---|
1165 | |
---|
1166 | _Chain_Extract_unprotected( &old_scheduler_node->Thread.Wait_node ); |
---|
1167 | _Assert( _Chain_Is_empty( &the_thread->Scheduler.Wait_nodes ) ); |
---|
1168 | _Chain_Initialize_one( |
---|
1169 | &the_thread->Scheduler.Wait_nodes, |
---|
1170 | &new_scheduler_node->Thread.Wait_node |
---|
1171 | ); |
---|
1172 | _Chain_Extract_unprotected( |
---|
1173 | &old_scheduler_node->Thread.Scheduler_node.Chain |
---|
1174 | ); |
---|
1175 | _Assert( _Chain_Is_empty( &the_thread->Scheduler.Scheduler_nodes ) ); |
---|
1176 | _Chain_Initialize_one( |
---|
1177 | &the_thread->Scheduler.Scheduler_nodes, |
---|
1178 | &new_scheduler_node->Thread.Scheduler_node.Chain |
---|
1179 | ); |
---|
1180 | |
---|
1181 | _Scheduler_Node_set_priority( new_scheduler_node, priority, false ); |
---|
1182 | |
---|
1183 | if ( _States_Is_ready( current_state ) ) { |
---|
1184 | _Scheduler_Unblock( the_thread ); |
---|
1185 | } |
---|
1186 | |
---|
1187 | return STATUS_SUCCESSFUL; |
---|
1188 | } |
---|
1189 | #endif |
---|
1190 | |
---|
1191 | _Scheduler_Node_set_priority( new_scheduler_node, priority, false ); |
---|
1192 | _Scheduler_Update_priority( the_thread ); |
---|
1193 | return STATUS_SUCCESSFUL; |
---|
1194 | } |
---|
1195 | |
---|
1196 | /** @} */ |
---|
1197 | |
---|
1198 | #ifdef __cplusplus |
---|
1199 | } |
---|
1200 | #endif |
---|
1201 | |
---|
1202 | #endif |
---|
1203 | /* end of include file */ |
---|