1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup RTEMSScoreScheduler |
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5 | * |
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6 | * @brief Inlined Routines Associated with the Manipulation of the Scheduler |
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7 | * |
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8 | * This inline file contains all of the inlined routines associated with |
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9 | * the manipulation of the scheduler. |
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10 | */ |
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11 | |
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12 | /* |
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13 | * Copyright (C) 2010 Gedare Bloom. |
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14 | * Copyright (C) 2011 On-Line Applications Research Corporation (OAR). |
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15 | * Copyright (c) 2014, 2017 embedded brains GmbH |
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16 | * |
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17 | * The license and distribution terms for this file may be |
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18 | * found in the file LICENSE in this distribution or at |
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19 | * http://www.rtems.org/license/LICENSE. |
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20 | */ |
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21 | |
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22 | #ifndef _RTEMS_SCORE_SCHEDULERIMPL_H |
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23 | #define _RTEMS_SCORE_SCHEDULERIMPL_H |
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24 | |
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25 | #include <rtems/score/scheduler.h> |
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26 | #include <rtems/score/assert.h> |
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27 | #include <rtems/score/priorityimpl.h> |
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28 | #include <rtems/score/smpimpl.h> |
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29 | #include <rtems/score/status.h> |
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30 | #include <rtems/score/threadimpl.h> |
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31 | |
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32 | #ifdef __cplusplus |
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33 | extern "C" { |
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34 | #endif |
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35 | |
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36 | /** |
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37 | * @addtogroup RTEMSScoreScheduler |
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38 | * |
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39 | * @{ |
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40 | */ |
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41 | |
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42 | /** |
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43 | * @brief Initializes the scheduler to the policy chosen by the user. |
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44 | * |
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45 | * This routine initializes the scheduler to the policy chosen by the user |
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46 | * through confdefs, or to the priority scheduler with ready chains by |
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47 | * default. |
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48 | */ |
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49 | void _Scheduler_Handler_initialization( void ); |
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50 | |
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51 | /** |
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52 | * @brief Gets the context of the scheduler. |
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53 | * |
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54 | * @param scheduler The scheduler to get the context of. |
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55 | * |
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56 | * @return The context of @a scheduler. |
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57 | */ |
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58 | RTEMS_INLINE_ROUTINE Scheduler_Context *_Scheduler_Get_context( |
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59 | const Scheduler_Control *scheduler |
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60 | ) |
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61 | { |
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62 | return scheduler->context; |
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63 | } |
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64 | |
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65 | /** |
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66 | * @brief Gets the scheduler for the cpu. |
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67 | * |
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68 | * @param cpu The cpu control to get the scheduler of. |
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69 | * |
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70 | * @return The scheduler for the cpu. |
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71 | */ |
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72 | RTEMS_INLINE_ROUTINE const Scheduler_Control *_Scheduler_Get_by_CPU( |
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73 | const Per_CPU_Control *cpu |
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74 | ) |
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75 | { |
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76 | #if defined(RTEMS_SMP) |
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77 | return cpu->Scheduler.control; |
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78 | #else |
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79 | (void) cpu; |
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80 | return &_Scheduler_Table[ 0 ]; |
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81 | #endif |
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82 | } |
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83 | |
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84 | /** |
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85 | * @brief Acquires the scheduler instance inside a critical section (interrupts |
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86 | * disabled). |
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87 | * |
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88 | * @param scheduler The scheduler instance. |
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89 | * @param lock_context The lock context to use for |
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90 | * _Scheduler_Release_critical(). |
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91 | */ |
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92 | RTEMS_INLINE_ROUTINE void _Scheduler_Acquire_critical( |
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93 | const Scheduler_Control *scheduler, |
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94 | ISR_lock_Context *lock_context |
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95 | ) |
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96 | { |
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97 | #if defined(RTEMS_SMP) |
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98 | Scheduler_Context *context; |
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99 | |
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100 | context = _Scheduler_Get_context( scheduler ); |
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101 | _ISR_lock_Acquire( &context->Lock, lock_context ); |
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102 | #else |
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103 | (void) scheduler; |
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104 | (void) lock_context; |
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105 | #endif |
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106 | } |
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107 | |
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108 | /** |
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109 | * @brief Releases the scheduler instance inside a critical section (interrupts |
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110 | * disabled). |
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111 | * |
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112 | * @param scheduler The scheduler instance. |
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113 | * @param lock_context The lock context used for |
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114 | * _Scheduler_Acquire_critical(). |
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115 | */ |
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116 | RTEMS_INLINE_ROUTINE void _Scheduler_Release_critical( |
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117 | const Scheduler_Control *scheduler, |
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118 | ISR_lock_Context *lock_context |
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119 | ) |
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120 | { |
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121 | #if defined(RTEMS_SMP) |
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122 | Scheduler_Context *context; |
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123 | |
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124 | context = _Scheduler_Get_context( scheduler ); |
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125 | _ISR_lock_Release( &context->Lock, lock_context ); |
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126 | #else |
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127 | (void) scheduler; |
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128 | (void) lock_context; |
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129 | #endif |
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130 | } |
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131 | |
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132 | #if defined(RTEMS_SMP) |
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133 | void _Scheduler_Request_ask_for_help( Thread_Control *the_thread ); |
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134 | |
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135 | /** |
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136 | * @brief Registers an ask for help request if necessary. |
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137 | * |
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138 | * The actual ask for help operation is carried out during |
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139 | * _Thread_Do_dispatch() on a processor related to the thread. This yields a |
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140 | * better separation of scheduler instances. A thread of one scheduler |
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141 | * instance should not be forced to carry out too much work for threads on |
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142 | * other scheduler instances. |
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143 | * |
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144 | * @param the_thread The thread in need for help. |
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145 | */ |
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146 | RTEMS_INLINE_ROUTINE void _Scheduler_Ask_for_help( Thread_Control *the_thread ) |
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147 | { |
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148 | _Assert( _Thread_State_is_owner( the_thread ) ); |
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149 | |
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150 | if ( the_thread->Scheduler.helping_nodes > 0 ) { |
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151 | _Scheduler_Request_ask_for_help( the_thread ); |
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152 | } |
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153 | } |
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154 | #endif |
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155 | |
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156 | /** |
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157 | * The preferred method to add a new scheduler is to define the jump table |
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158 | * entries and add a case to the _Scheduler_Initialize routine. |
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159 | * |
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160 | * Generic scheduling implementations that rely on the ready queue only can |
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161 | * be found in the _Scheduler_queue_XXX functions. |
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162 | */ |
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163 | |
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164 | /* |
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165 | * Passing the Scheduler_Control* to these functions allows for multiple |
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166 | * scheduler's to exist simultaneously, which could be useful on an SMP |
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167 | * system. Then remote Schedulers may be accessible. How to protect such |
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168 | * accesses remains an open problem. |
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169 | */ |
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170 | |
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171 | /** |
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172 | * @brief General scheduling decision. |
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173 | * |
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174 | * This kernel routine implements the scheduling decision logic for |
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175 | * the scheduler. It does NOT dispatch. |
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176 | * |
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177 | * @param the_thread The thread which state changed previously. |
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178 | */ |
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179 | RTEMS_INLINE_ROUTINE void _Scheduler_Schedule( Thread_Control *the_thread ) |
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180 | { |
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181 | const Scheduler_Control *scheduler; |
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182 | ISR_lock_Context lock_context; |
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183 | |
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184 | scheduler = _Thread_Scheduler_get_home( the_thread ); |
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185 | _Scheduler_Acquire_critical( scheduler, &lock_context ); |
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186 | |
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187 | ( *scheduler->Operations.schedule )( scheduler, the_thread ); |
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188 | |
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189 | _Scheduler_Release_critical( scheduler, &lock_context ); |
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190 | } |
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191 | |
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192 | /** |
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193 | * @brief Scheduler yield with a particular thread. |
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194 | * |
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195 | * This routine is invoked when a thread wishes to voluntarily transfer control |
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196 | * of the processor to another thread. |
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197 | * |
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198 | * @param the_thread The yielding thread. |
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199 | */ |
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200 | RTEMS_INLINE_ROUTINE void _Scheduler_Yield( Thread_Control *the_thread ) |
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201 | { |
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202 | const Scheduler_Control *scheduler; |
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203 | ISR_lock_Context lock_context; |
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204 | |
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205 | scheduler = _Thread_Scheduler_get_home( the_thread ); |
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206 | _Scheduler_Acquire_critical( scheduler, &lock_context ); |
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207 | ( *scheduler->Operations.yield )( |
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208 | scheduler, |
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209 | the_thread, |
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210 | _Thread_Scheduler_get_home_node( the_thread ) |
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211 | ); |
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212 | _Scheduler_Release_critical( scheduler, &lock_context ); |
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213 | } |
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214 | |
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215 | /** |
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216 | * @brief Blocks a thread with respect to the scheduler. |
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217 | * |
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218 | * This routine removes @a the_thread from the scheduling decision for |
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219 | * the scheduler. The primary task is to remove the thread from the |
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220 | * ready queue. It performs any necessary scheduling operations |
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221 | * including the selection of a new heir thread. |
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222 | * |
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223 | * @param the_thread The thread. |
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224 | */ |
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225 | RTEMS_INLINE_ROUTINE void _Scheduler_Block( Thread_Control *the_thread ) |
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226 | { |
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227 | #if defined(RTEMS_SMP) |
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228 | Chain_Node *node; |
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229 | const Chain_Node *tail; |
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230 | Scheduler_Node *scheduler_node; |
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231 | const Scheduler_Control *scheduler; |
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232 | ISR_lock_Context lock_context; |
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233 | |
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234 | node = _Chain_First( &the_thread->Scheduler.Scheduler_nodes ); |
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235 | tail = _Chain_Immutable_tail( &the_thread->Scheduler.Scheduler_nodes ); |
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236 | |
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237 | scheduler_node = SCHEDULER_NODE_OF_THREAD_SCHEDULER_NODE( node ); |
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238 | scheduler = _Scheduler_Node_get_scheduler( scheduler_node ); |
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239 | |
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240 | _Scheduler_Acquire_critical( scheduler, &lock_context ); |
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241 | ( *scheduler->Operations.block )( |
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242 | scheduler, |
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243 | the_thread, |
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244 | scheduler_node |
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245 | ); |
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246 | _Scheduler_Release_critical( scheduler, &lock_context ); |
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247 | |
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248 | node = _Chain_Next( node ); |
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249 | |
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250 | while ( node != tail ) { |
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251 | scheduler_node = SCHEDULER_NODE_OF_THREAD_SCHEDULER_NODE( node ); |
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252 | scheduler = _Scheduler_Node_get_scheduler( scheduler_node ); |
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253 | |
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254 | _Scheduler_Acquire_critical( scheduler, &lock_context ); |
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255 | ( *scheduler->Operations.withdraw_node )( |
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256 | scheduler, |
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257 | the_thread, |
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258 | scheduler_node, |
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259 | THREAD_SCHEDULER_BLOCKED |
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260 | ); |
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261 | _Scheduler_Release_critical( scheduler, &lock_context ); |
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262 | |
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263 | node = _Chain_Next( node ); |
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264 | } |
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265 | #else |
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266 | const Scheduler_Control *scheduler; |
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267 | |
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268 | scheduler = _Thread_Scheduler_get_home( the_thread ); |
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269 | ( *scheduler->Operations.block )( |
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270 | scheduler, |
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271 | the_thread, |
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272 | _Thread_Scheduler_get_home_node( the_thread ) |
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273 | ); |
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274 | #endif |
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275 | } |
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276 | |
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277 | /** |
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278 | * @brief Unblocks a thread with respect to the scheduler. |
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279 | * |
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280 | * This operation must fetch the latest thread priority value for this |
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281 | * scheduler instance and update its internal state if necessary. |
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282 | * |
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283 | * @param the_thread The thread. |
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284 | * |
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285 | * @see _Scheduler_Node_get_priority(). |
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286 | */ |
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287 | RTEMS_INLINE_ROUTINE void _Scheduler_Unblock( Thread_Control *the_thread ) |
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288 | { |
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289 | Scheduler_Node *scheduler_node; |
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290 | const Scheduler_Control *scheduler; |
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291 | ISR_lock_Context lock_context; |
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292 | |
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293 | #if defined(RTEMS_SMP) |
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294 | scheduler_node = SCHEDULER_NODE_OF_THREAD_SCHEDULER_NODE( |
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295 | _Chain_First( &the_thread->Scheduler.Scheduler_nodes ) |
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296 | ); |
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297 | scheduler = _Scheduler_Node_get_scheduler( scheduler_node ); |
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298 | #else |
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299 | scheduler_node = _Thread_Scheduler_get_home_node( the_thread ); |
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300 | scheduler = _Thread_Scheduler_get_home( the_thread ); |
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301 | #endif |
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302 | |
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303 | _Scheduler_Acquire_critical( scheduler, &lock_context ); |
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304 | ( *scheduler->Operations.unblock )( scheduler, the_thread, scheduler_node ); |
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305 | _Scheduler_Release_critical( scheduler, &lock_context ); |
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306 | } |
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307 | |
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308 | /** |
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309 | * @brief Propagates a priority change of a thread to the scheduler. |
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310 | * |
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311 | * On uni-processor configurations, this operation must evaluate the thread |
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312 | * state. In case the thread is not ready, then the priority update should be |
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313 | * deferred to the next scheduler unblock operation. |
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314 | * |
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315 | * The operation must update the heir and thread dispatch necessary variables |
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316 | * in case the set of scheduled threads changes. |
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317 | * |
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318 | * @param the_thread The thread changing its priority. |
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319 | * |
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320 | * @see _Scheduler_Node_get_priority(). |
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321 | */ |
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322 | RTEMS_INLINE_ROUTINE void _Scheduler_Update_priority( Thread_Control *the_thread ) |
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323 | { |
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324 | #if defined(RTEMS_SMP) |
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325 | Chain_Node *node; |
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326 | const Chain_Node *tail; |
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327 | |
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328 | _Thread_Scheduler_process_requests( the_thread ); |
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329 | |
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330 | node = _Chain_First( &the_thread->Scheduler.Scheduler_nodes ); |
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331 | tail = _Chain_Immutable_tail( &the_thread->Scheduler.Scheduler_nodes ); |
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332 | |
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333 | do { |
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334 | Scheduler_Node *scheduler_node; |
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335 | const Scheduler_Control *scheduler; |
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336 | ISR_lock_Context lock_context; |
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337 | |
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338 | scheduler_node = SCHEDULER_NODE_OF_THREAD_SCHEDULER_NODE( node ); |
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339 | scheduler = _Scheduler_Node_get_scheduler( scheduler_node ); |
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340 | |
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341 | _Scheduler_Acquire_critical( scheduler, &lock_context ); |
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342 | ( *scheduler->Operations.update_priority )( |
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343 | scheduler, |
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344 | the_thread, |
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345 | scheduler_node |
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346 | ); |
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347 | _Scheduler_Release_critical( scheduler, &lock_context ); |
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348 | |
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349 | node = _Chain_Next( node ); |
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350 | } while ( node != tail ); |
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351 | #else |
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352 | const Scheduler_Control *scheduler; |
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353 | |
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354 | scheduler = _Thread_Scheduler_get_home( the_thread ); |
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355 | ( *scheduler->Operations.update_priority )( |
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356 | scheduler, |
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357 | the_thread, |
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358 | _Thread_Scheduler_get_home_node( the_thread ) |
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359 | ); |
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360 | #endif |
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361 | } |
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362 | |
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363 | #if defined(RTEMS_SMP) |
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364 | /** |
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365 | * @brief Changes the sticky level of the home scheduler node and propagates a |
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366 | * priority change of a thread to the scheduler. |
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367 | * |
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368 | * @param the_thread The thread changing its priority or sticky level. |
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369 | * |
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370 | * @see _Scheduler_Update_priority(). |
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371 | */ |
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372 | RTEMS_INLINE_ROUTINE void _Scheduler_Priority_and_sticky_update( |
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373 | Thread_Control *the_thread, |
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374 | int sticky_level_change |
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375 | ) |
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376 | { |
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377 | Chain_Node *node; |
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378 | const Chain_Node *tail; |
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379 | Scheduler_Node *scheduler_node; |
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380 | const Scheduler_Control *scheduler; |
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381 | ISR_lock_Context lock_context; |
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382 | |
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383 | _Thread_Scheduler_process_requests( the_thread ); |
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384 | |
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385 | node = _Chain_First( &the_thread->Scheduler.Scheduler_nodes ); |
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386 | scheduler_node = SCHEDULER_NODE_OF_THREAD_SCHEDULER_NODE( node ); |
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387 | scheduler = _Scheduler_Node_get_scheduler( scheduler_node ); |
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388 | |
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389 | _Scheduler_Acquire_critical( scheduler, &lock_context ); |
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390 | |
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391 | scheduler_node->sticky_level += sticky_level_change; |
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392 | _Assert( scheduler_node->sticky_level >= 0 ); |
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393 | |
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394 | ( *scheduler->Operations.update_priority )( |
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395 | scheduler, |
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396 | the_thread, |
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397 | scheduler_node |
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398 | ); |
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399 | |
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400 | _Scheduler_Release_critical( scheduler, &lock_context ); |
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401 | |
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402 | tail = _Chain_Immutable_tail( &the_thread->Scheduler.Scheduler_nodes ); |
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403 | node = _Chain_Next( node ); |
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404 | |
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405 | while ( node != tail ) { |
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406 | scheduler_node = SCHEDULER_NODE_OF_THREAD_SCHEDULER_NODE( node ); |
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407 | scheduler = _Scheduler_Node_get_scheduler( scheduler_node ); |
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408 | |
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409 | _Scheduler_Acquire_critical( scheduler, &lock_context ); |
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410 | ( *scheduler->Operations.update_priority )( |
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411 | scheduler, |
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412 | the_thread, |
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413 | scheduler_node |
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414 | ); |
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415 | _Scheduler_Release_critical( scheduler, &lock_context ); |
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416 | |
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417 | node = _Chain_Next( node ); |
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418 | } |
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419 | } |
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420 | #endif |
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421 | |
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422 | /** |
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423 | * @brief Maps a thread priority from the user domain to the scheduler domain. |
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424 | * |
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425 | * Let M be the maximum scheduler priority. The mapping must be bijective in |
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426 | * the closed interval [0, M], e.g. _Scheduler_Unmap_priority( scheduler, |
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427 | * _Scheduler_Map_priority( scheduler, p ) ) == p for all p in [0, M]. For |
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428 | * other values the mapping is undefined. |
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429 | * |
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430 | * @param scheduler The scheduler instance. |
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431 | * @param priority The user domain thread priority. |
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432 | * |
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433 | * @return The corresponding thread priority of the scheduler domain is returned. |
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434 | */ |
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435 | RTEMS_INLINE_ROUTINE Priority_Control _Scheduler_Map_priority( |
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436 | const Scheduler_Control *scheduler, |
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437 | Priority_Control priority |
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438 | ) |
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439 | { |
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440 | return ( *scheduler->Operations.map_priority )( scheduler, priority ); |
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441 | } |
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442 | |
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443 | /** |
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444 | * @brief Unmaps a thread priority from the scheduler domain to the user domain. |
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445 | * |
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446 | * @param scheduler The scheduler instance. |
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447 | * @param priority The scheduler domain thread priority. |
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448 | * |
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449 | * @return The corresponding thread priority of the user domain is returned. |
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450 | */ |
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451 | RTEMS_INLINE_ROUTINE Priority_Control _Scheduler_Unmap_priority( |
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452 | const Scheduler_Control *scheduler, |
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453 | Priority_Control priority |
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454 | ) |
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455 | { |
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456 | return ( *scheduler->Operations.unmap_priority )( scheduler, priority ); |
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457 | } |
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458 | |
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459 | /** |
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460 | * @brief Initializes a scheduler node. |
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461 | * |
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462 | * The scheduler node contains arbitrary data on function entry. The caller |
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463 | * must ensure that _Scheduler_Node_destroy() will be called after a |
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464 | * _Scheduler_Node_initialize() before the memory of the scheduler node is |
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465 | * destroyed. |
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466 | * |
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467 | * @param scheduler The scheduler instance. |
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468 | * @param[out] node The scheduler node to initialize. |
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469 | * @param the_thread The thread of the scheduler node to initialize. |
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470 | * @param priority The thread priority. |
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471 | */ |
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472 | RTEMS_INLINE_ROUTINE void _Scheduler_Node_initialize( |
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473 | const Scheduler_Control *scheduler, |
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474 | Scheduler_Node *node, |
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475 | Thread_Control *the_thread, |
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476 | Priority_Control priority |
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477 | ) |
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478 | { |
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479 | ( *scheduler->Operations.node_initialize )( |
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480 | scheduler, |
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481 | node, |
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482 | the_thread, |
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483 | priority |
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484 | ); |
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485 | } |
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486 | |
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487 | /** |
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488 | * @brief Destroys a scheduler node. |
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489 | * |
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490 | * The caller must ensure that _Scheduler_Node_destroy() will be called only |
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491 | * after a corresponding _Scheduler_Node_initialize(). |
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492 | * |
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493 | * @param scheduler The scheduler instance. |
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494 | * @param[out] node The scheduler node to destroy. |
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495 | */ |
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496 | RTEMS_INLINE_ROUTINE void _Scheduler_Node_destroy( |
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497 | const Scheduler_Control *scheduler, |
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498 | Scheduler_Node *node |
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499 | ) |
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500 | { |
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501 | ( *scheduler->Operations.node_destroy )( scheduler, node ); |
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502 | } |
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503 | |
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504 | /** |
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505 | * @brief Releases a job of a thread with respect to the scheduler. |
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506 | * |
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507 | * @param the_thread The thread. |
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508 | * @param priority_node The priority node of the job. |
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509 | * @param deadline The deadline in watchdog ticks since boot. |
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510 | * @param queue_context The thread queue context to provide the set of |
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511 | * threads for _Thread_Priority_update(). |
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512 | */ |
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513 | RTEMS_INLINE_ROUTINE void _Scheduler_Release_job( |
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514 | Thread_Control *the_thread, |
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515 | Priority_Node *priority_node, |
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516 | uint64_t deadline, |
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517 | Thread_queue_Context *queue_context |
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518 | ) |
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519 | { |
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520 | const Scheduler_Control *scheduler = _Thread_Scheduler_get_home( the_thread ); |
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521 | |
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522 | _Thread_queue_Context_clear_priority_updates( queue_context ); |
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523 | ( *scheduler->Operations.release_job )( |
---|
524 | scheduler, |
---|
525 | the_thread, |
---|
526 | priority_node, |
---|
527 | deadline, |
---|
528 | queue_context |
---|
529 | ); |
---|
530 | } |
---|
531 | |
---|
532 | /** |
---|
533 | * @brief Cancels a job of a thread with respect to the scheduler. |
---|
534 | * |
---|
535 | * @param the_thread The thread. |
---|
536 | * @param priority_node The priority node of the job. |
---|
537 | * @param queue_context The thread queue context to provide the set of |
---|
538 | * threads for _Thread_Priority_update(). |
---|
539 | */ |
---|
540 | RTEMS_INLINE_ROUTINE void _Scheduler_Cancel_job( |
---|
541 | Thread_Control *the_thread, |
---|
542 | Priority_Node *priority_node, |
---|
543 | Thread_queue_Context *queue_context |
---|
544 | ) |
---|
545 | { |
---|
546 | const Scheduler_Control *scheduler = _Thread_Scheduler_get_home( the_thread ); |
---|
547 | |
---|
548 | _Thread_queue_Context_clear_priority_updates( queue_context ); |
---|
549 | ( *scheduler->Operations.cancel_job )( |
---|
550 | scheduler, |
---|
551 | the_thread, |
---|
552 | priority_node, |
---|
553 | queue_context |
---|
554 | ); |
---|
555 | } |
---|
556 | |
---|
557 | /** |
---|
558 | * @brief Scheduler method invoked at each clock tick. |
---|
559 | * |
---|
560 | * This method is invoked at each clock tick to allow the scheduler |
---|
561 | * implementation to perform any activities required. For the |
---|
562 | * scheduler which support standard RTEMS features, this includes |
---|
563 | * time-slicing management. |
---|
564 | * |
---|
565 | * @param cpu The cpu control for the operation. |
---|
566 | */ |
---|
567 | RTEMS_INLINE_ROUTINE void _Scheduler_Tick( const Per_CPU_Control *cpu ) |
---|
568 | { |
---|
569 | const Scheduler_Control *scheduler = _Scheduler_Get_by_CPU( cpu ); |
---|
570 | Thread_Control *executing = cpu->executing; |
---|
571 | |
---|
572 | if ( scheduler != NULL && executing != NULL ) { |
---|
573 | ( *scheduler->Operations.tick )( scheduler, executing ); |
---|
574 | } |
---|
575 | } |
---|
576 | |
---|
577 | /** |
---|
578 | * @brief Starts the idle thread for a particular processor. |
---|
579 | * |
---|
580 | * @param scheduler The scheduler instance. |
---|
581 | * @param[in,out] the_thread The idle thread for the processor. |
---|
582 | * @param[in,out] cpu The processor for the idle thread. |
---|
583 | * |
---|
584 | * @see _Thread_Create_idle(). |
---|
585 | */ |
---|
586 | RTEMS_INLINE_ROUTINE void _Scheduler_Start_idle( |
---|
587 | const Scheduler_Control *scheduler, |
---|
588 | Thread_Control *the_thread, |
---|
589 | Per_CPU_Control *cpu |
---|
590 | ) |
---|
591 | { |
---|
592 | ( *scheduler->Operations.start_idle )( scheduler, the_thread, cpu ); |
---|
593 | } |
---|
594 | |
---|
595 | /** |
---|
596 | * @brief Checks if the scheduler of the cpu with the given index is equal |
---|
597 | * to the given scheduler. |
---|
598 | * |
---|
599 | * @param scheduler The scheduler for the comparison. |
---|
600 | * @param cpu_index The index of the cpu for the comparison. |
---|
601 | * |
---|
602 | * @retval true The scheduler of the cpu is the given @a scheduler. |
---|
603 | * @retval false The scheduler of the cpu is not the given @a scheduler. |
---|
604 | */ |
---|
605 | RTEMS_INLINE_ROUTINE bool _Scheduler_Has_processor_ownership( |
---|
606 | const Scheduler_Control *scheduler, |
---|
607 | uint32_t cpu_index |
---|
608 | ) |
---|
609 | { |
---|
610 | #if defined(RTEMS_SMP) |
---|
611 | const Per_CPU_Control *cpu; |
---|
612 | const Scheduler_Control *scheduler_of_cpu; |
---|
613 | |
---|
614 | cpu = _Per_CPU_Get_by_index( cpu_index ); |
---|
615 | scheduler_of_cpu = _Scheduler_Get_by_CPU( cpu ); |
---|
616 | |
---|
617 | return scheduler_of_cpu == scheduler; |
---|
618 | #else |
---|
619 | (void) scheduler; |
---|
620 | (void) cpu_index; |
---|
621 | |
---|
622 | return true; |
---|
623 | #endif |
---|
624 | } |
---|
625 | |
---|
626 | /** |
---|
627 | * @brief Gets the processors of the scheduler |
---|
628 | * |
---|
629 | * @param scheduler The scheduler to get the processors of. |
---|
630 | * |
---|
631 | * @return The processors of the context of the given scheduler. |
---|
632 | */ |
---|
633 | RTEMS_INLINE_ROUTINE const Processor_mask *_Scheduler_Get_processors( |
---|
634 | const Scheduler_Control *scheduler |
---|
635 | ) |
---|
636 | { |
---|
637 | #if defined(RTEMS_SMP) |
---|
638 | return &_Scheduler_Get_context( scheduler )->Processors; |
---|
639 | #else |
---|
640 | return &_Processor_mask_The_one_and_only; |
---|
641 | #endif |
---|
642 | } |
---|
643 | |
---|
644 | /** |
---|
645 | * @brief Copies the thread's scheduler's affinity to the given cpuset. |
---|
646 | * |
---|
647 | * @param the_thread The thread to get the affinity of its scheduler. |
---|
648 | * @param cpusetsize The size of @a cpuset. |
---|
649 | * @param[out] cpuset The cpuset that serves as destination for the copy operation |
---|
650 | * |
---|
651 | * @retval true The copy operation was lossless. |
---|
652 | * @retval false The copy operation was not lossless |
---|
653 | */ |
---|
654 | bool _Scheduler_Get_affinity( |
---|
655 | Thread_Control *the_thread, |
---|
656 | size_t cpusetsize, |
---|
657 | cpu_set_t *cpuset |
---|
658 | ); |
---|
659 | |
---|
660 | /** |
---|
661 | * @brief Checks if the affinity is a subset of the online processors. |
---|
662 | * |
---|
663 | * @param scheduler This parameter is unused. |
---|
664 | * @param the_thread This parameter is unused. |
---|
665 | * @param node This parameter is unused. |
---|
666 | * @param affinity The processor mask to check. |
---|
667 | * |
---|
668 | * @retval true @a affinity is a subset of the online processors. |
---|
669 | * @retval false @a affinity is not a subset of the online processors. |
---|
670 | */ |
---|
671 | RTEMS_INLINE_ROUTINE bool _Scheduler_default_Set_affinity_body( |
---|
672 | const Scheduler_Control *scheduler, |
---|
673 | Thread_Control *the_thread, |
---|
674 | Scheduler_Node *node, |
---|
675 | const Processor_mask *affinity |
---|
676 | ) |
---|
677 | { |
---|
678 | (void) scheduler; |
---|
679 | (void) the_thread; |
---|
680 | (void) node; |
---|
681 | return _Processor_mask_Is_subset( affinity, _SMP_Get_online_processors() ); |
---|
682 | } |
---|
683 | |
---|
684 | /** |
---|
685 | * @brief Sets the thread's scheduler's affinity. |
---|
686 | * |
---|
687 | * @param[in, out] the_thread The thread to set the affinity of. |
---|
688 | * @param cpusetsize The size of @a cpuset. |
---|
689 | * @param cpuset The cpuset to set the affinity. |
---|
690 | * |
---|
691 | * @retval true The operation succeeded. |
---|
692 | * @retval false The operation did not succeed. |
---|
693 | */ |
---|
694 | bool _Scheduler_Set_affinity( |
---|
695 | Thread_Control *the_thread, |
---|
696 | size_t cpusetsize, |
---|
697 | const cpu_set_t *cpuset |
---|
698 | ); |
---|
699 | |
---|
700 | /** |
---|
701 | * @brief Blocks the thread. |
---|
702 | * |
---|
703 | * @param scheduler The scheduler instance. |
---|
704 | * @param the_thread The thread to block. |
---|
705 | * @param node The corresponding scheduler node. |
---|
706 | * @param extract Method to extract the thread. |
---|
707 | * @param schedule Method for scheduling threads. |
---|
708 | */ |
---|
709 | RTEMS_INLINE_ROUTINE void _Scheduler_Generic_block( |
---|
710 | const Scheduler_Control *scheduler, |
---|
711 | Thread_Control *the_thread, |
---|
712 | Scheduler_Node *node, |
---|
713 | void ( *extract )( |
---|
714 | const Scheduler_Control *, |
---|
715 | Thread_Control *, |
---|
716 | Scheduler_Node * |
---|
717 | ), |
---|
718 | void ( *schedule )( |
---|
719 | const Scheduler_Control *, |
---|
720 | Thread_Control *, |
---|
721 | bool |
---|
722 | ) |
---|
723 | ) |
---|
724 | { |
---|
725 | ( *extract )( scheduler, the_thread, node ); |
---|
726 | |
---|
727 | /* TODO: flash critical section? */ |
---|
728 | |
---|
729 | if ( _Thread_Is_executing( the_thread ) || _Thread_Is_heir( the_thread ) ) { |
---|
730 | ( *schedule )( scheduler, the_thread, true ); |
---|
731 | } |
---|
732 | } |
---|
733 | |
---|
734 | /** |
---|
735 | * @brief Gets the number of processors of the scheduler. |
---|
736 | * |
---|
737 | * @param scheduler The scheduler instance to get the number of processors of. |
---|
738 | * |
---|
739 | * @return The number of processors. |
---|
740 | */ |
---|
741 | RTEMS_INLINE_ROUTINE uint32_t _Scheduler_Get_processor_count( |
---|
742 | const Scheduler_Control *scheduler |
---|
743 | ) |
---|
744 | { |
---|
745 | #if defined(RTEMS_SMP) |
---|
746 | const Scheduler_Context *context = _Scheduler_Get_context( scheduler ); |
---|
747 | |
---|
748 | return _Processor_mask_Count( &context->Processors ); |
---|
749 | #else |
---|
750 | (void) scheduler; |
---|
751 | |
---|
752 | return 1; |
---|
753 | #endif |
---|
754 | } |
---|
755 | |
---|
756 | /** |
---|
757 | * @brief Builds an object build id. |
---|
758 | * |
---|
759 | * @param scheduler_index The index to build the build id out of. |
---|
760 | * |
---|
761 | * @return The build id. |
---|
762 | */ |
---|
763 | RTEMS_INLINE_ROUTINE Objects_Id _Scheduler_Build_id( uint32_t scheduler_index ) |
---|
764 | { |
---|
765 | return _Objects_Build_id( |
---|
766 | OBJECTS_FAKE_OBJECTS_API, |
---|
767 | OBJECTS_FAKE_OBJECTS_SCHEDULERS, |
---|
768 | _Objects_Local_node, |
---|
769 | (uint16_t) ( scheduler_index + 1 ) |
---|
770 | ); |
---|
771 | } |
---|
772 | |
---|
773 | /** |
---|
774 | * @brief Gets the scheduler index from the given object build id. |
---|
775 | * |
---|
776 | * @param id The object build id. |
---|
777 | * |
---|
778 | * @return The scheduler index. |
---|
779 | */ |
---|
780 | RTEMS_INLINE_ROUTINE uint32_t _Scheduler_Get_index_by_id( Objects_Id id ) |
---|
781 | { |
---|
782 | uint32_t minimum_id = _Scheduler_Build_id( 0 ); |
---|
783 | |
---|
784 | return id - minimum_id; |
---|
785 | } |
---|
786 | |
---|
787 | /** |
---|
788 | * @brief Gets the scheduler from the given object build id. |
---|
789 | * |
---|
790 | * @param id The object build id. |
---|
791 | * |
---|
792 | * @return The scheduler to the object id. |
---|
793 | */ |
---|
794 | RTEMS_INLINE_ROUTINE const Scheduler_Control *_Scheduler_Get_by_id( |
---|
795 | Objects_Id id |
---|
796 | ) |
---|
797 | { |
---|
798 | uint32_t index; |
---|
799 | |
---|
800 | index = _Scheduler_Get_index_by_id( id ); |
---|
801 | |
---|
802 | if ( index >= _Scheduler_Count ) { |
---|
803 | return NULL; |
---|
804 | } |
---|
805 | |
---|
806 | return &_Scheduler_Table[ index ]; |
---|
807 | } |
---|
808 | |
---|
809 | /** |
---|
810 | * @brief Gets the index of the scheduler |
---|
811 | * |
---|
812 | * @param scheduler The scheduler to get the index of. |
---|
813 | * |
---|
814 | * @return The index of the given scheduler. |
---|
815 | */ |
---|
816 | RTEMS_INLINE_ROUTINE uint32_t _Scheduler_Get_index( |
---|
817 | const Scheduler_Control *scheduler |
---|
818 | ) |
---|
819 | { |
---|
820 | return (uint32_t) (scheduler - &_Scheduler_Table[ 0 ]); |
---|
821 | } |
---|
822 | |
---|
823 | #if defined(RTEMS_SMP) |
---|
824 | /** |
---|
825 | * @brief Gets an idle thread from the scheduler instance. |
---|
826 | * |
---|
827 | * @param context The scheduler instance context. |
---|
828 | * |
---|
829 | * @return idle An idle thread for use. This function must always return an |
---|
830 | * idle thread. If none is available, then this is a fatal error. |
---|
831 | */ |
---|
832 | typedef Thread_Control *( *Scheduler_Get_idle_thread )( |
---|
833 | Scheduler_Context *context |
---|
834 | ); |
---|
835 | |
---|
836 | /** |
---|
837 | * @brief Releases an idle thread to the scheduler instance for reuse. |
---|
838 | * |
---|
839 | * @param context The scheduler instance context. |
---|
840 | * @param idle The idle thread to release. |
---|
841 | */ |
---|
842 | typedef void ( *Scheduler_Release_idle_thread )( |
---|
843 | Scheduler_Context *context, |
---|
844 | Thread_Control *idle |
---|
845 | ); |
---|
846 | |
---|
847 | /** |
---|
848 | * @brief Changes the threads state to the given new state. |
---|
849 | * |
---|
850 | * @param[out] the_thread The thread to change the state of. |
---|
851 | * @param new_state The new state for @a the_thread. |
---|
852 | */ |
---|
853 | RTEMS_INLINE_ROUTINE void _Scheduler_Thread_change_state( |
---|
854 | Thread_Control *the_thread, |
---|
855 | Thread_Scheduler_state new_state |
---|
856 | ) |
---|
857 | { |
---|
858 | _Assert( |
---|
859 | _ISR_lock_Is_owner( &the_thread->Scheduler.Lock ) |
---|
860 | || the_thread->Scheduler.state == THREAD_SCHEDULER_BLOCKED |
---|
861 | || !_System_state_Is_up( _System_state_Get() ) |
---|
862 | ); |
---|
863 | |
---|
864 | the_thread->Scheduler.state = new_state; |
---|
865 | } |
---|
866 | |
---|
867 | /** |
---|
868 | * @brief Sets the scheduler node's idle thread. |
---|
869 | * |
---|
870 | * @param[in, out] node The node to receive an idle thread. |
---|
871 | * @param idle The idle thread control for the operation. |
---|
872 | */ |
---|
873 | RTEMS_INLINE_ROUTINE void _Scheduler_Set_idle_thread( |
---|
874 | Scheduler_Node *node, |
---|
875 | Thread_Control *idle |
---|
876 | ) |
---|
877 | { |
---|
878 | _Assert( _Scheduler_Node_get_idle( node ) == NULL ); |
---|
879 | _Assert( |
---|
880 | _Scheduler_Node_get_owner( node ) == _Scheduler_Node_get_user( node ) |
---|
881 | ); |
---|
882 | |
---|
883 | _Scheduler_Node_set_user( node, idle ); |
---|
884 | node->idle = idle; |
---|
885 | } |
---|
886 | |
---|
887 | /** |
---|
888 | * @brief Uses an idle thread for this scheduler node. |
---|
889 | * |
---|
890 | * A thread whose home scheduler node has a sticky level greater than zero may |
---|
891 | * use an idle thread in the home scheduler instance in the case it executes |
---|
892 | * currently in another scheduler instance or in the case it is in a blocking |
---|
893 | * state. |
---|
894 | * |
---|
895 | * @param context The scheduler instance context. |
---|
896 | * @param[in, out] node The node which wants to use the idle thread. |
---|
897 | * @param cpu The processor for the idle thread. |
---|
898 | * @param get_idle_thread Function to get an idle thread. |
---|
899 | */ |
---|
900 | RTEMS_INLINE_ROUTINE Thread_Control *_Scheduler_Use_idle_thread( |
---|
901 | Scheduler_Context *context, |
---|
902 | Scheduler_Node *node, |
---|
903 | Per_CPU_Control *cpu, |
---|
904 | Scheduler_Get_idle_thread get_idle_thread |
---|
905 | ) |
---|
906 | { |
---|
907 | Thread_Control *idle = ( *get_idle_thread )( context ); |
---|
908 | |
---|
909 | _Scheduler_Set_idle_thread( node, idle ); |
---|
910 | _Thread_Set_CPU( idle, cpu ); |
---|
911 | return idle; |
---|
912 | } |
---|
913 | |
---|
914 | typedef enum { |
---|
915 | SCHEDULER_TRY_TO_SCHEDULE_DO_SCHEDULE, |
---|
916 | SCHEDULER_TRY_TO_SCHEDULE_DO_IDLE_EXCHANGE, |
---|
917 | SCHEDULER_TRY_TO_SCHEDULE_DO_BLOCK |
---|
918 | } Scheduler_Try_to_schedule_action; |
---|
919 | |
---|
920 | /** |
---|
921 | * @brief Tries to schedule this scheduler node. |
---|
922 | * |
---|
923 | * @param context The scheduler instance context. |
---|
924 | * @param[in, out] node The node which wants to get scheduled. |
---|
925 | * @param idle A potential idle thread used by a potential victim node. |
---|
926 | * @param get_idle_thread Function to get an idle thread. |
---|
927 | * |
---|
928 | * @retval true This node can be scheduled. |
---|
929 | * @retval false This node cannot be scheduled. |
---|
930 | */ |
---|
931 | RTEMS_INLINE_ROUTINE Scheduler_Try_to_schedule_action |
---|
932 | _Scheduler_Try_to_schedule_node( |
---|
933 | Scheduler_Context *context, |
---|
934 | Scheduler_Node *node, |
---|
935 | Thread_Control *idle, |
---|
936 | Scheduler_Get_idle_thread get_idle_thread |
---|
937 | ) |
---|
938 | { |
---|
939 | ISR_lock_Context lock_context; |
---|
940 | Scheduler_Try_to_schedule_action action; |
---|
941 | Thread_Control *owner; |
---|
942 | |
---|
943 | action = SCHEDULER_TRY_TO_SCHEDULE_DO_SCHEDULE; |
---|
944 | owner = _Scheduler_Node_get_owner( node ); |
---|
945 | _Assert( _Scheduler_Node_get_user( node ) == owner ); |
---|
946 | _Assert( _Scheduler_Node_get_idle( node ) == NULL ); |
---|
947 | |
---|
948 | _Thread_Scheduler_acquire_critical( owner, &lock_context ); |
---|
949 | |
---|
950 | if ( owner->Scheduler.state == THREAD_SCHEDULER_READY ) { |
---|
951 | _Thread_Scheduler_cancel_need_for_help( owner, _Thread_Get_CPU( owner ) ); |
---|
952 | _Scheduler_Thread_change_state( owner, THREAD_SCHEDULER_SCHEDULED ); |
---|
953 | } else if ( |
---|
954 | owner->Scheduler.state == THREAD_SCHEDULER_SCHEDULED |
---|
955 | && node->sticky_level <= 1 |
---|
956 | ) { |
---|
957 | action = SCHEDULER_TRY_TO_SCHEDULE_DO_BLOCK; |
---|
958 | } else if ( node->sticky_level == 0 ) { |
---|
959 | action = SCHEDULER_TRY_TO_SCHEDULE_DO_BLOCK; |
---|
960 | } else if ( idle != NULL ) { |
---|
961 | action = SCHEDULER_TRY_TO_SCHEDULE_DO_IDLE_EXCHANGE; |
---|
962 | } else { |
---|
963 | _Scheduler_Use_idle_thread( |
---|
964 | context, |
---|
965 | node, |
---|
966 | _Thread_Get_CPU( owner ), |
---|
967 | get_idle_thread |
---|
968 | ); |
---|
969 | } |
---|
970 | |
---|
971 | _Thread_Scheduler_release_critical( owner, &lock_context ); |
---|
972 | return action; |
---|
973 | } |
---|
974 | |
---|
975 | /** |
---|
976 | * @brief Releases an idle thread using this scheduler node. |
---|
977 | * |
---|
978 | * @param context The scheduler instance context. |
---|
979 | * @param[in, out] node The node which may have an idle thread as user. |
---|
980 | * @param release_idle_thread Function to release an idle thread. |
---|
981 | * |
---|
982 | * @retval idle The idle thread which used this node. |
---|
983 | * @retval NULL This node had no idle thread as an user. |
---|
984 | */ |
---|
985 | RTEMS_INLINE_ROUTINE Thread_Control *_Scheduler_Release_idle_thread( |
---|
986 | Scheduler_Context *context, |
---|
987 | Scheduler_Node *node, |
---|
988 | Scheduler_Release_idle_thread release_idle_thread |
---|
989 | ) |
---|
990 | { |
---|
991 | Thread_Control *idle = _Scheduler_Node_get_idle( node ); |
---|
992 | |
---|
993 | if ( idle != NULL ) { |
---|
994 | Thread_Control *owner = _Scheduler_Node_get_owner( node ); |
---|
995 | |
---|
996 | node->idle = NULL; |
---|
997 | _Scheduler_Node_set_user( node, owner ); |
---|
998 | ( *release_idle_thread )( context, idle ); |
---|
999 | } |
---|
1000 | |
---|
1001 | return idle; |
---|
1002 | } |
---|
1003 | |
---|
1004 | /** |
---|
1005 | * @brief Exchanges an idle thread from the scheduler node that uses it |
---|
1006 | * right now to another scheduler node. |
---|
1007 | * |
---|
1008 | * @param needs_idle The scheduler node that needs an idle thread. |
---|
1009 | * @param uses_idle The scheduler node that used the idle thread. |
---|
1010 | * @param idle The idle thread that is exchanged. |
---|
1011 | */ |
---|
1012 | RTEMS_INLINE_ROUTINE void _Scheduler_Exchange_idle_thread( |
---|
1013 | Scheduler_Node *needs_idle, |
---|
1014 | Scheduler_Node *uses_idle, |
---|
1015 | Thread_Control *idle |
---|
1016 | ) |
---|
1017 | { |
---|
1018 | uses_idle->idle = NULL; |
---|
1019 | _Scheduler_Node_set_user( |
---|
1020 | uses_idle, |
---|
1021 | _Scheduler_Node_get_owner( uses_idle ) |
---|
1022 | ); |
---|
1023 | _Scheduler_Set_idle_thread( needs_idle, idle ); |
---|
1024 | } |
---|
1025 | |
---|
1026 | /** |
---|
1027 | * @brief Blocks this scheduler node. |
---|
1028 | * |
---|
1029 | * @param context The scheduler instance context. |
---|
1030 | * @param[in, out] thread The thread which wants to get blocked referencing this |
---|
1031 | * node. This is not necessarily the user of this node in case the node |
---|
1032 | * participates in the scheduler helping protocol. |
---|
1033 | * @param[in, out] node The node which wants to get blocked. |
---|
1034 | * @param is_scheduled This node is scheduled. |
---|
1035 | * @param get_idle_thread Function to get an idle thread. |
---|
1036 | * |
---|
1037 | * @retval thread_cpu The processor of the thread. Indicates to continue with |
---|
1038 | * the blocking operation. |
---|
1039 | * @retval NULL Otherwise. |
---|
1040 | */ |
---|
1041 | RTEMS_INLINE_ROUTINE Per_CPU_Control *_Scheduler_Block_node( |
---|
1042 | Scheduler_Context *context, |
---|
1043 | Thread_Control *thread, |
---|
1044 | Scheduler_Node *node, |
---|
1045 | bool is_scheduled, |
---|
1046 | Scheduler_Get_idle_thread get_idle_thread |
---|
1047 | ) |
---|
1048 | { |
---|
1049 | int sticky_level; |
---|
1050 | ISR_lock_Context lock_context; |
---|
1051 | Per_CPU_Control *thread_cpu; |
---|
1052 | |
---|
1053 | sticky_level = node->sticky_level; |
---|
1054 | --sticky_level; |
---|
1055 | node->sticky_level = sticky_level; |
---|
1056 | _Assert( sticky_level >= 0 ); |
---|
1057 | |
---|
1058 | _Thread_Scheduler_acquire_critical( thread, &lock_context ); |
---|
1059 | thread_cpu = _Thread_Get_CPU( thread ); |
---|
1060 | _Thread_Scheduler_cancel_need_for_help( thread, thread_cpu ); |
---|
1061 | _Scheduler_Thread_change_state( thread, THREAD_SCHEDULER_BLOCKED ); |
---|
1062 | _Thread_Scheduler_release_critical( thread, &lock_context ); |
---|
1063 | |
---|
1064 | if ( sticky_level > 0 ) { |
---|
1065 | if ( is_scheduled && _Scheduler_Node_get_idle( node ) == NULL ) { |
---|
1066 | Thread_Control *idle; |
---|
1067 | |
---|
1068 | idle = _Scheduler_Use_idle_thread( |
---|
1069 | context, |
---|
1070 | node, |
---|
1071 | thread_cpu, |
---|
1072 | get_idle_thread |
---|
1073 | ); |
---|
1074 | _Thread_Dispatch_update_heir( _Per_CPU_Get(), thread_cpu, idle ); |
---|
1075 | } |
---|
1076 | |
---|
1077 | return NULL; |
---|
1078 | } |
---|
1079 | |
---|
1080 | _Assert( thread == _Scheduler_Node_get_user( node ) ); |
---|
1081 | return thread_cpu; |
---|
1082 | } |
---|
1083 | |
---|
1084 | /** |
---|
1085 | * @brief Discard the idle thread from the scheduler node. |
---|
1086 | * |
---|
1087 | * @param context The scheduler context. |
---|
1088 | * @param[in, out] the_thread The thread for the operation. |
---|
1089 | * @param[in, out] node The scheduler node to discard the idle thread from. |
---|
1090 | * @param release_idle_thread Method to release the idle thread from the context. |
---|
1091 | */ |
---|
1092 | RTEMS_INLINE_ROUTINE void _Scheduler_Discard_idle_thread( |
---|
1093 | Scheduler_Context *context, |
---|
1094 | Thread_Control *the_thread, |
---|
1095 | Scheduler_Node *node, |
---|
1096 | Scheduler_Release_idle_thread release_idle_thread |
---|
1097 | ) |
---|
1098 | { |
---|
1099 | Thread_Control *idle; |
---|
1100 | Thread_Control *owner; |
---|
1101 | Per_CPU_Control *cpu; |
---|
1102 | |
---|
1103 | idle = _Scheduler_Node_get_idle( node ); |
---|
1104 | owner = _Scheduler_Node_get_owner( node ); |
---|
1105 | |
---|
1106 | node->idle = NULL; |
---|
1107 | _Assert( _Scheduler_Node_get_user( node ) == idle ); |
---|
1108 | _Scheduler_Node_set_user( node, owner ); |
---|
1109 | ( *release_idle_thread )( context, idle ); |
---|
1110 | |
---|
1111 | cpu = _Thread_Get_CPU( idle ); |
---|
1112 | _Thread_Set_CPU( the_thread, cpu ); |
---|
1113 | _Thread_Dispatch_update_heir( _Per_CPU_Get(), cpu, the_thread ); |
---|
1114 | } |
---|
1115 | |
---|
1116 | /** |
---|
1117 | * @brief Unblocks this scheduler node. |
---|
1118 | * |
---|
1119 | * @param context The scheduler instance context. |
---|
1120 | * @param[in, out] the_thread The thread which wants to get unblocked. |
---|
1121 | * @param[in, out] node The node which wants to get unblocked. |
---|
1122 | * @param is_scheduled This node is scheduled. |
---|
1123 | * @param release_idle_thread Function to release an idle thread. |
---|
1124 | * |
---|
1125 | * @retval true Continue with the unblocking operation. |
---|
1126 | * @retval false Do not continue with the unblocking operation. |
---|
1127 | */ |
---|
1128 | RTEMS_INLINE_ROUTINE bool _Scheduler_Unblock_node( |
---|
1129 | Scheduler_Context *context, |
---|
1130 | Thread_Control *the_thread, |
---|
1131 | Scheduler_Node *node, |
---|
1132 | bool is_scheduled, |
---|
1133 | Scheduler_Release_idle_thread release_idle_thread |
---|
1134 | ) |
---|
1135 | { |
---|
1136 | bool unblock; |
---|
1137 | |
---|
1138 | ++node->sticky_level; |
---|
1139 | _Assert( node->sticky_level > 0 ); |
---|
1140 | |
---|
1141 | if ( is_scheduled ) { |
---|
1142 | _Scheduler_Discard_idle_thread( |
---|
1143 | context, |
---|
1144 | the_thread, |
---|
1145 | node, |
---|
1146 | release_idle_thread |
---|
1147 | ); |
---|
1148 | _Scheduler_Thread_change_state( the_thread, THREAD_SCHEDULER_SCHEDULED ); |
---|
1149 | unblock = false; |
---|
1150 | } else { |
---|
1151 | _Scheduler_Thread_change_state( the_thread, THREAD_SCHEDULER_READY ); |
---|
1152 | unblock = true; |
---|
1153 | } |
---|
1154 | |
---|
1155 | return unblock; |
---|
1156 | } |
---|
1157 | #endif |
---|
1158 | |
---|
1159 | /** |
---|
1160 | * @brief Updates the heir. |
---|
1161 | * |
---|
1162 | * @param[in, out] new_heir The new heir. |
---|
1163 | * @param force_dispatch Indicates whether the dispatch happens also if the |
---|
1164 | * currently running thread is set as not preemptible. |
---|
1165 | */ |
---|
1166 | RTEMS_INLINE_ROUTINE void _Scheduler_Update_heir( |
---|
1167 | Thread_Control *new_heir, |
---|
1168 | bool force_dispatch |
---|
1169 | ) |
---|
1170 | { |
---|
1171 | Thread_Control *heir = _Thread_Heir; |
---|
1172 | |
---|
1173 | if ( heir != new_heir && ( heir->is_preemptible || force_dispatch ) ) { |
---|
1174 | #if defined(RTEMS_SMP) |
---|
1175 | /* |
---|
1176 | * We need this state only for _Thread_Get_CPU_time_used(). Cannot use |
---|
1177 | * _Scheduler_Thread_change_state() since THREAD_SCHEDULER_BLOCKED to |
---|
1178 | * THREAD_SCHEDULER_BLOCKED state changes are illegal for the real SMP |
---|
1179 | * schedulers. |
---|
1180 | */ |
---|
1181 | heir->Scheduler.state = THREAD_SCHEDULER_BLOCKED; |
---|
1182 | new_heir->Scheduler.state = THREAD_SCHEDULER_SCHEDULED; |
---|
1183 | #endif |
---|
1184 | _Thread_Update_CPU_time_used( heir, _Thread_Get_CPU( heir ) ); |
---|
1185 | _Thread_Heir = new_heir; |
---|
1186 | _Thread_Dispatch_necessary = true; |
---|
1187 | } |
---|
1188 | } |
---|
1189 | |
---|
1190 | /** |
---|
1191 | * @brief Sets a new scheduler. |
---|
1192 | * |
---|
1193 | * @param new_scheduler The new scheduler to set. |
---|
1194 | * @param[in, out] the_thread The thread for the operations. |
---|
1195 | * @param priority The initial priority for the thread with the new scheduler. |
---|
1196 | * |
---|
1197 | * @retval STATUS_SUCCESSFUL The operation succeeded. |
---|
1198 | * @retval STATUS_RESOURCE_IN_USE The thread's wait queue is not empty. |
---|
1199 | * @retval STATUS_UNSATISFIED The new scheduler has no processors. |
---|
1200 | */ |
---|
1201 | RTEMS_INLINE_ROUTINE Status_Control _Scheduler_Set( |
---|
1202 | const Scheduler_Control *new_scheduler, |
---|
1203 | Thread_Control *the_thread, |
---|
1204 | Priority_Control priority |
---|
1205 | ) |
---|
1206 | { |
---|
1207 | Scheduler_Node *new_scheduler_node; |
---|
1208 | Scheduler_Node *old_scheduler_node; |
---|
1209 | #if defined(RTEMS_SMP) |
---|
1210 | ISR_lock_Context lock_context; |
---|
1211 | const Scheduler_Control *old_scheduler; |
---|
1212 | |
---|
1213 | #endif |
---|
1214 | |
---|
1215 | if ( the_thread->Wait.queue != NULL ) { |
---|
1216 | return STATUS_RESOURCE_IN_USE; |
---|
1217 | } |
---|
1218 | |
---|
1219 | old_scheduler_node = _Thread_Scheduler_get_home_node( the_thread ); |
---|
1220 | _Priority_Plain_extract( |
---|
1221 | &old_scheduler_node->Wait.Priority, |
---|
1222 | &the_thread->Real_priority |
---|
1223 | ); |
---|
1224 | |
---|
1225 | if ( |
---|
1226 | !_Priority_Is_empty( &old_scheduler_node->Wait.Priority ) |
---|
1227 | #if defined(RTEMS_SMP) |
---|
1228 | || !_Chain_Has_only_one_node( &the_thread->Scheduler.Wait_nodes ) |
---|
1229 | || the_thread->Scheduler.pin_level != 0 |
---|
1230 | #endif |
---|
1231 | ) { |
---|
1232 | _Priority_Plain_insert( |
---|
1233 | &old_scheduler_node->Wait.Priority, |
---|
1234 | &the_thread->Real_priority, |
---|
1235 | the_thread->Real_priority.priority |
---|
1236 | ); |
---|
1237 | return STATUS_RESOURCE_IN_USE; |
---|
1238 | } |
---|
1239 | |
---|
1240 | #if defined(RTEMS_SMP) |
---|
1241 | old_scheduler = _Thread_Scheduler_get_home( the_thread ); |
---|
1242 | new_scheduler_node = _Thread_Scheduler_get_node_by_index( |
---|
1243 | the_thread, |
---|
1244 | _Scheduler_Get_index( new_scheduler ) |
---|
1245 | ); |
---|
1246 | |
---|
1247 | _Scheduler_Acquire_critical( new_scheduler, &lock_context ); |
---|
1248 | |
---|
1249 | if ( |
---|
1250 | _Scheduler_Get_processor_count( new_scheduler ) == 0 |
---|
1251 | || !( *new_scheduler->Operations.set_affinity )( |
---|
1252 | new_scheduler, |
---|
1253 | the_thread, |
---|
1254 | new_scheduler_node, |
---|
1255 | &the_thread->Scheduler.Affinity |
---|
1256 | ) |
---|
1257 | ) { |
---|
1258 | _Scheduler_Release_critical( new_scheduler, &lock_context ); |
---|
1259 | _Priority_Plain_insert( |
---|
1260 | &old_scheduler_node->Wait.Priority, |
---|
1261 | &the_thread->Real_priority, |
---|
1262 | the_thread->Real_priority.priority |
---|
1263 | ); |
---|
1264 | return STATUS_UNSATISFIED; |
---|
1265 | } |
---|
1266 | |
---|
1267 | _Assert( the_thread->Scheduler.pinned_scheduler == NULL ); |
---|
1268 | the_thread->Scheduler.home_scheduler = new_scheduler; |
---|
1269 | |
---|
1270 | _Scheduler_Release_critical( new_scheduler, &lock_context ); |
---|
1271 | |
---|
1272 | _Thread_Scheduler_process_requests( the_thread ); |
---|
1273 | #else |
---|
1274 | new_scheduler_node = old_scheduler_node; |
---|
1275 | #endif |
---|
1276 | |
---|
1277 | the_thread->Start.initial_priority = priority; |
---|
1278 | _Priority_Node_set_priority( &the_thread->Real_priority, priority ); |
---|
1279 | _Priority_Initialize_one( |
---|
1280 | &new_scheduler_node->Wait.Priority, |
---|
1281 | &the_thread->Real_priority |
---|
1282 | ); |
---|
1283 | |
---|
1284 | #if defined(RTEMS_SMP) |
---|
1285 | if ( old_scheduler != new_scheduler ) { |
---|
1286 | States_Control current_state; |
---|
1287 | |
---|
1288 | current_state = the_thread->current_state; |
---|
1289 | |
---|
1290 | if ( _States_Is_ready( current_state ) ) { |
---|
1291 | _Scheduler_Block( the_thread ); |
---|
1292 | } |
---|
1293 | |
---|
1294 | _Assert( old_scheduler_node->sticky_level == 0 ); |
---|
1295 | _Assert( new_scheduler_node->sticky_level == 0 ); |
---|
1296 | |
---|
1297 | _Chain_Extract_unprotected( &old_scheduler_node->Thread.Wait_node ); |
---|
1298 | _Assert( _Chain_Is_empty( &the_thread->Scheduler.Wait_nodes ) ); |
---|
1299 | _Chain_Initialize_one( |
---|
1300 | &the_thread->Scheduler.Wait_nodes, |
---|
1301 | &new_scheduler_node->Thread.Wait_node |
---|
1302 | ); |
---|
1303 | _Chain_Extract_unprotected( |
---|
1304 | &old_scheduler_node->Thread.Scheduler_node.Chain |
---|
1305 | ); |
---|
1306 | _Assert( _Chain_Is_empty( &the_thread->Scheduler.Scheduler_nodes ) ); |
---|
1307 | _Chain_Initialize_one( |
---|
1308 | &the_thread->Scheduler.Scheduler_nodes, |
---|
1309 | &new_scheduler_node->Thread.Scheduler_node.Chain |
---|
1310 | ); |
---|
1311 | |
---|
1312 | _Scheduler_Node_set_priority( new_scheduler_node, priority, false ); |
---|
1313 | |
---|
1314 | if ( _States_Is_ready( current_state ) ) { |
---|
1315 | _Scheduler_Unblock( the_thread ); |
---|
1316 | } |
---|
1317 | |
---|
1318 | return STATUS_SUCCESSFUL; |
---|
1319 | } |
---|
1320 | #endif |
---|
1321 | |
---|
1322 | _Scheduler_Node_set_priority( new_scheduler_node, priority, false ); |
---|
1323 | _Scheduler_Update_priority( the_thread ); |
---|
1324 | return STATUS_SUCCESSFUL; |
---|
1325 | } |
---|
1326 | |
---|
1327 | /** @} */ |
---|
1328 | |
---|
1329 | #ifdef __cplusplus |
---|
1330 | } |
---|
1331 | #endif |
---|
1332 | |
---|
1333 | #endif |
---|
1334 | /* end of include file */ |
---|