1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Inlined Routines from the Thread Handler |
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5 | * |
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6 | * This file contains the macro implementation of the inlined |
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7 | * routines from the Thread handler. |
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8 | */ |
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9 | |
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10 | /* |
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11 | * COPYRIGHT (c) 1989-2008. |
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12 | * On-Line Applications Research Corporation (OAR). |
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13 | * |
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14 | * Copyright (c) 2014, 2016 embedded brains GmbH. |
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15 | * |
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16 | * The license and distribution terms for this file may be |
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17 | * found in the file LICENSE in this distribution or at |
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18 | * http://www.rtems.org/license/LICENSE. |
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19 | */ |
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20 | |
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21 | #ifndef _RTEMS_SCORE_THREADIMPL_H |
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22 | #define _RTEMS_SCORE_THREADIMPL_H |
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23 | |
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24 | #include <rtems/score/thread.h> |
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25 | #include <rtems/score/assert.h> |
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26 | #include <rtems/score/chainimpl.h> |
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27 | #include <rtems/score/interr.h> |
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28 | #include <rtems/score/isr.h> |
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29 | #include <rtems/score/objectimpl.h> |
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30 | #include <rtems/score/resourceimpl.h> |
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31 | #include <rtems/score/schedulernodeimpl.h> |
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32 | #include <rtems/score/statesimpl.h> |
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33 | #include <rtems/score/status.h> |
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34 | #include <rtems/score/sysstate.h> |
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35 | #include <rtems/score/threadqimpl.h> |
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36 | #include <rtems/score/todimpl.h> |
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37 | #include <rtems/score/freechain.h> |
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38 | #include <rtems/score/watchdogimpl.h> |
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39 | #include <rtems/config.h> |
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40 | |
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41 | #ifdef __cplusplus |
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42 | extern "C" { |
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43 | #endif |
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44 | |
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45 | /** |
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46 | * @addtogroup ScoreThread |
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47 | */ |
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48 | /**@{**/ |
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49 | |
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50 | /** |
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51 | * The following structure contains the information necessary to manage |
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52 | * a thread which it is waiting for a resource. |
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53 | */ |
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54 | #define THREAD_STATUS_PROXY_BLOCKING 0x1111111 |
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55 | |
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56 | /** |
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57 | * Self for the GNU Ada Run-Time |
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58 | */ |
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59 | extern void *rtems_ada_self; |
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60 | |
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61 | typedef struct { |
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62 | Objects_Information Objects; |
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63 | |
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64 | Freechain_Control Free_thread_queue_heads; |
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65 | } Thread_Information; |
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66 | |
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67 | /** |
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68 | * The following defines the information control block used to |
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69 | * manage this class of objects. |
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70 | */ |
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71 | extern Thread_Information _Thread_Internal_information; |
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72 | |
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73 | /** |
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74 | * The following points to the thread whose floating point |
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75 | * context is currently loaded. |
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76 | */ |
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77 | #if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE ) |
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78 | extern Thread_Control *_Thread_Allocated_fp; |
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79 | #endif |
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80 | |
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81 | #if defined(RTEMS_SMP) |
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82 | #define THREAD_RESOURCE_NODE_TO_THREAD( node ) \ |
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83 | RTEMS_CONTAINER_OF( node, Thread_Control, Resource_node ) |
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84 | #endif |
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85 | |
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86 | void _Thread_Initialize_information( |
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87 | Thread_Information *information, |
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88 | Objects_APIs the_api, |
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89 | uint16_t the_class, |
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90 | uint32_t maximum, |
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91 | bool is_string, |
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92 | uint32_t maximum_name_length |
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93 | ); |
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94 | |
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95 | /** |
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96 | * @brief Initialize thread handler. |
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97 | * |
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98 | * This routine performs the initialization necessary for this handler. |
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99 | */ |
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100 | void _Thread_Handler_initialization(void); |
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101 | |
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102 | /** |
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103 | * @brief Create idle thread. |
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104 | * |
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105 | * This routine creates the idle thread. |
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106 | * |
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107 | * @warning No thread should be created before this one. |
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108 | */ |
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109 | void _Thread_Create_idle(void); |
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110 | |
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111 | /** |
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112 | * @brief Start thread multitasking. |
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113 | * |
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114 | * This routine initiates multitasking. It is invoked only as |
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115 | * part of initialization and its invocation is the last act of |
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116 | * the non-multitasking part of the system initialization. |
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117 | */ |
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118 | void _Thread_Start_multitasking( void ) RTEMS_NO_RETURN; |
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119 | |
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120 | /** |
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121 | * @brief Allocate the requested stack space for the thread. |
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122 | * |
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123 | * Allocate the requested stack space for the thread. |
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124 | * Set the Start.stack field to the address of the stack. |
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125 | * |
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126 | * @param[in] the_thread is the thread where the stack space is requested |
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127 | * @param[in] stack_size is the stack space is requested |
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128 | * |
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129 | * @retval actual size allocated after any adjustment |
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130 | * @retval zero if the allocation failed |
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131 | */ |
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132 | size_t _Thread_Stack_Allocate( |
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133 | Thread_Control *the_thread, |
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134 | size_t stack_size |
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135 | ); |
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136 | |
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137 | /** |
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138 | * @brief Deallocate thread stack. |
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139 | * |
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140 | * Deallocate the Thread's stack. |
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141 | */ |
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142 | void _Thread_Stack_Free( |
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143 | Thread_Control *the_thread |
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144 | ); |
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145 | |
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146 | /** |
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147 | * @brief Initialize thread. |
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148 | * |
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149 | * This routine initializes the specified the thread. It allocates |
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150 | * all memory associated with this thread. It completes by adding |
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151 | * the thread to the local object table so operations on this |
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152 | * thread id are allowed. |
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153 | * |
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154 | * @note If stack_area is NULL, it is allocated from the workspace. |
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155 | * |
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156 | * @note If the stack is allocated from the workspace, then it is |
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157 | * guaranteed to be of at least minimum size. |
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158 | */ |
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159 | bool _Thread_Initialize( |
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160 | Thread_Information *information, |
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161 | Thread_Control *the_thread, |
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162 | const struct Scheduler_Control *scheduler, |
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163 | void *stack_area, |
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164 | size_t stack_size, |
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165 | bool is_fp, |
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166 | Priority_Control priority, |
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167 | bool is_preemptible, |
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168 | Thread_CPU_budget_algorithms budget_algorithm, |
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169 | Thread_CPU_budget_algorithm_callout budget_callout, |
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170 | uint32_t isr_level, |
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171 | Objects_Name name |
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172 | ); |
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173 | |
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174 | /** |
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175 | * @brief Initializes thread and executes it. |
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176 | * |
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177 | * This routine initializes the executable information for a thread |
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178 | * and makes it ready to execute. After this routine executes, the |
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179 | * thread competes with all other threads for CPU time. |
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180 | * |
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181 | * @param the_thread The thread to be started. |
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182 | * @param entry The thread entry information. |
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183 | */ |
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184 | bool _Thread_Start( |
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185 | Thread_Control *the_thread, |
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186 | const Thread_Entry_information *entry, |
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187 | ISR_lock_Context *lock_context |
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188 | ); |
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189 | |
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190 | void _Thread_Restart_self( |
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191 | Thread_Control *executing, |
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192 | const Thread_Entry_information *entry, |
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193 | ISR_lock_Context *lock_context |
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194 | ) RTEMS_NO_RETURN; |
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195 | |
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196 | bool _Thread_Restart_other( |
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197 | Thread_Control *the_thread, |
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198 | const Thread_Entry_information *entry, |
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199 | ISR_lock_Context *lock_context |
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200 | ); |
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201 | |
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202 | void _Thread_Yield( Thread_Control *executing ); |
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203 | |
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204 | Thread_Life_state _Thread_Change_life( |
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205 | Thread_Life_state clear, |
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206 | Thread_Life_state set, |
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207 | Thread_Life_state ignore |
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208 | ); |
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209 | |
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210 | Thread_Life_state _Thread_Set_life_protection( Thread_Life_state state ); |
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211 | |
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212 | /** |
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213 | * @brief Kills all zombie threads in the system. |
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214 | * |
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215 | * Threads change into the zombie state as the last step in the thread |
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216 | * termination sequence right before a context switch to the heir thread is |
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217 | * initiated. Since the thread stack is still in use during this phase we have |
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218 | * to postpone the thread stack reclamation until this point. On SMP |
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219 | * configurations we may have to busy wait for context switch completion here. |
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220 | */ |
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221 | void _Thread_Kill_zombies( void ); |
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222 | |
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223 | void _Thread_Exit( |
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224 | Thread_Control *executing, |
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225 | Thread_Life_state set, |
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226 | void *exit_value |
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227 | ); |
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228 | |
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229 | void _Thread_Join( |
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230 | Thread_Control *the_thread, |
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231 | States_Control waiting_for_join, |
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232 | Thread_Control *executing, |
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233 | Thread_queue_Context *queue_context |
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234 | ); |
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235 | |
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236 | void _Thread_Cancel( |
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237 | Thread_Control *the_thread, |
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238 | Thread_Control *executing, |
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239 | void *exit_value |
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240 | ); |
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241 | |
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242 | /** |
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243 | * @brief Closes the thread. |
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244 | * |
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245 | * Closes the thread object and starts the thread termination sequence. In |
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246 | * case the executing thread is not terminated, then this function waits until |
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247 | * the terminating thread reached the zombie state. |
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248 | */ |
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249 | void _Thread_Close( Thread_Control *the_thread, Thread_Control *executing ); |
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250 | |
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251 | RTEMS_INLINE_ROUTINE bool _Thread_Is_ready( const Thread_Control *the_thread ) |
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252 | { |
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253 | return _States_Is_ready( the_thread->current_state ); |
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254 | } |
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255 | |
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256 | States_Control _Thread_Clear_state_locked( |
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257 | Thread_Control *the_thread, |
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258 | States_Control state |
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259 | ); |
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260 | |
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261 | /** |
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262 | * @brief Clears the specified thread state. |
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263 | * |
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264 | * In case the previous state is a non-ready state and the next state is the |
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265 | * ready state, then the thread is unblocked by the scheduler. |
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266 | * |
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267 | * @param[in] the_thread The thread. |
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268 | * @param[in] state The state to clear. It must not be zero. |
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269 | * |
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270 | * @return The previous state. |
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271 | */ |
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272 | States_Control _Thread_Clear_state( |
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273 | Thread_Control *the_thread, |
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274 | States_Control state |
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275 | ); |
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276 | |
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277 | States_Control _Thread_Set_state_locked( |
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278 | Thread_Control *the_thread, |
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279 | States_Control state |
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280 | ); |
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281 | |
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282 | /** |
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283 | * @brief Sets the specified thread state. |
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284 | * |
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285 | * In case the previous state is the ready state, then the thread is blocked by |
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286 | * the scheduler. |
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287 | * |
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288 | * @param[in] the_thread The thread. |
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289 | * @param[in] state The state to set. It must not be zero. |
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290 | * |
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291 | * @return The previous state. |
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292 | */ |
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293 | States_Control _Thread_Set_state( |
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294 | Thread_Control *the_thread, |
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295 | States_Control state |
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296 | ); |
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297 | |
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298 | /** |
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299 | * @brief Initializes enviroment for a thread. |
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300 | * |
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301 | * This routine initializes the context of @a the_thread to its |
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302 | * appropriate starting state. |
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303 | * |
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304 | * @param[in] the_thread is the pointer to the thread control block. |
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305 | */ |
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306 | void _Thread_Load_environment( |
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307 | Thread_Control *the_thread |
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308 | ); |
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309 | |
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310 | void _Thread_Entry_adaptor_idle( Thread_Control *executing ); |
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311 | |
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312 | void _Thread_Entry_adaptor_numeric( Thread_Control *executing ); |
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313 | |
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314 | void _Thread_Entry_adaptor_pointer( Thread_Control *executing ); |
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315 | |
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316 | /** |
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317 | * @brief Wrapper function for all threads. |
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318 | * |
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319 | * This routine is the wrapper function for all threads. It is |
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320 | * the starting point for all threads. The user provided thread |
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321 | * entry point is invoked by this routine. Operations |
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322 | * which must be performed immediately before and after the user's |
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323 | * thread executes are found here. |
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324 | * |
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325 | * @note On entry, it is assumed all interrupts are blocked and that this |
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326 | * routine needs to set the initial isr level. This may or may not |
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327 | * actually be needed by the context switch routine and as a result |
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328 | * interrupts may already be at there proper level. Either way, |
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329 | * setting the initial isr level properly here is safe. |
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330 | */ |
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331 | void _Thread_Handler( void ); |
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332 | |
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333 | /** |
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334 | * @brief Executes the global constructors and then restarts itself as the |
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335 | * first initialization thread. |
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336 | * |
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337 | * The first initialization thread is the first RTEMS initialization task or |
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338 | * the first POSIX initialization thread in case no RTEMS initialization tasks |
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339 | * are present. |
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340 | */ |
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341 | void _Thread_Global_construction( |
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342 | Thread_Control *executing, |
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343 | const Thread_Entry_information *entry |
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344 | ) RTEMS_NO_RETURN; |
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345 | |
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346 | /** |
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347 | * @brief Ended the delay of a thread. |
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348 | * |
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349 | * This routine is invoked when a thread must be unblocked at the |
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350 | * end of a time based delay (i.e. wake after or wake when). |
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351 | * It is called by the watchdog handler. |
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352 | * |
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353 | * @param[in] id is the thread id |
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354 | * @param[in] ignored is not used |
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355 | */ |
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356 | void _Thread_Delay_ended( |
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357 | Objects_Id id, |
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358 | void *ignored |
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359 | ); |
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360 | |
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361 | RTEMS_INLINE_ROUTINE void _Thread_State_acquire_critical( |
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362 | Thread_Control *the_thread, |
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363 | ISR_lock_Context *lock_context |
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364 | ) |
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365 | { |
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366 | _Thread_queue_Do_acquire_critical( &the_thread->Join_queue, lock_context ); |
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367 | } |
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368 | |
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369 | RTEMS_INLINE_ROUTINE void _Thread_State_acquire( |
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370 | Thread_Control *the_thread, |
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371 | ISR_lock_Context *lock_context |
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372 | ) |
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373 | { |
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374 | _ISR_lock_ISR_disable( lock_context ); |
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375 | _Thread_State_acquire_critical( the_thread, lock_context ); |
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376 | } |
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377 | |
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378 | RTEMS_INLINE_ROUTINE Thread_Control *_Thread_State_acquire_for_executing( |
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379 | ISR_lock_Context *lock_context |
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380 | ) |
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381 | { |
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382 | Thread_Control *executing; |
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383 | |
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384 | _ISR_lock_ISR_disable( lock_context ); |
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385 | executing = _Thread_Executing; |
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386 | _Thread_State_acquire_critical( executing, lock_context ); |
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387 | |
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388 | return executing; |
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389 | } |
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390 | |
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391 | RTEMS_INLINE_ROUTINE void _Thread_State_release_critical( |
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392 | Thread_Control *the_thread, |
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393 | ISR_lock_Context *lock_context |
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394 | ) |
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395 | { |
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396 | _Thread_queue_Do_release_critical( &the_thread->Join_queue, lock_context ); |
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397 | } |
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398 | |
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399 | RTEMS_INLINE_ROUTINE void _Thread_State_release( |
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400 | Thread_Control *the_thread, |
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401 | ISR_lock_Context *lock_context |
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402 | ) |
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403 | { |
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404 | _Thread_State_release_critical( the_thread, lock_context ); |
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405 | _ISR_lock_ISR_enable( lock_context ); |
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406 | } |
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407 | |
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408 | #if defined(RTEMS_DEBUG) |
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409 | RTEMS_INLINE_ROUTINE bool _Thread_State_is_owner( |
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410 | const Thread_Control *the_thread |
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411 | ) |
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412 | { |
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413 | return _Thread_queue_Is_lock_owner( &the_thread->Join_queue ); |
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414 | } |
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415 | #endif |
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416 | |
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417 | /** |
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418 | * @brief Returns true if the left thread priority is less than the right |
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419 | * thread priority in the intuitive sense of priority and false otherwise. |
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420 | */ |
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421 | RTEMS_INLINE_ROUTINE bool _Thread_Priority_less_than( |
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422 | Priority_Control left, |
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423 | Priority_Control right |
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424 | ) |
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425 | { |
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426 | return left > right; |
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427 | } |
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428 | |
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429 | /** |
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430 | * @brief Returns the highest priority of the left and right thread priorities |
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431 | * in the intuitive sense of priority. |
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432 | */ |
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433 | RTEMS_INLINE_ROUTINE Priority_Control _Thread_Priority_highest( |
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434 | Priority_Control left, |
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435 | Priority_Control right |
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436 | ) |
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437 | { |
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438 | return _Thread_Priority_less_than( left, right ) ? right : left; |
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439 | } |
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440 | |
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441 | /** |
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442 | * @brief Filters a thread priority change. |
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443 | * |
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444 | * Called by _Thread_Change_priority() under the protection of the thread lock. |
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445 | * |
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446 | * @param[in] the_thread The thread. |
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447 | * @param[in, out] new_priority The new priority of the thread. The filter may |
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448 | * alter this value. |
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449 | * @param[in] arg The argument passed to _Thread_Change_priority(). |
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450 | * |
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451 | * @retval true Change the current priority. |
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452 | * @retval false Otherwise. |
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453 | */ |
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454 | typedef bool ( *Thread_Change_priority_filter )( |
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455 | Thread_Control *the_thread, |
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456 | Priority_Control *new_priority, |
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457 | void *arg |
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458 | ); |
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459 | |
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460 | Thread_Control *_Thread_Apply_priority( |
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461 | Thread_Control *the_thread, |
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462 | Priority_Control new_priority, |
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463 | void *arg, |
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464 | Thread_Change_priority_filter filter, |
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465 | bool prepend_it |
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466 | ); |
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467 | |
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468 | void _Thread_Update_priority( Thread_Control *the_thread ); |
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469 | |
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470 | /** |
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471 | * @brief Changes the priority of a thread if allowed by the filter function. |
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472 | * |
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473 | * It changes current priority of the thread to the new priority in case the |
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474 | * filter function returns true. In this case the scheduler is notified of the |
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475 | * priority change as well. |
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476 | * |
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477 | * @param[in] the_thread The thread. |
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478 | * @param[in] new_priority The new priority of the thread. |
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479 | * @param[in] arg The argument for the filter function. |
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480 | * @param[in] filter The filter function to determine if a priority change is |
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481 | * allowed and optionally perform other actions under the protection of the |
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482 | * thread lock simultaneously with the update of the current priority. |
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483 | * @param[in] prepend_it In case this is true, then the thread is prepended to |
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484 | * its priority group in its scheduler instance, otherwise it is appended. |
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485 | */ |
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486 | void _Thread_Change_priority( |
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487 | Thread_Control *the_thread, |
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488 | Priority_Control new_priority, |
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489 | void *arg, |
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490 | Thread_Change_priority_filter filter, |
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491 | bool prepend_it |
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492 | ); |
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493 | |
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494 | /** |
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495 | * @brief Raises the priority of a thread. |
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496 | * |
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497 | * It changes the current priority of the thread to the new priority if the new |
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498 | * priority is higher than the current priority. In this case the thread is |
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499 | * appended to its new priority group in its scheduler instance. |
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500 | * |
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501 | * @param[in] the_thread The thread. |
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502 | * @param[in] new_priority The new priority of the thread. |
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503 | * |
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504 | * @see _Thread_Change_priority(). |
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505 | */ |
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506 | void _Thread_Raise_priority( |
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507 | Thread_Control *the_thread, |
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508 | Priority_Control new_priority |
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509 | ); |
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510 | |
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511 | /** |
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512 | * @brief Sets the current to the real priority of a thread. |
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513 | * |
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514 | * Sets the priority restore hint to false. |
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515 | */ |
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516 | void _Thread_Restore_priority( Thread_Control *the_thread ); |
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517 | |
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518 | /** |
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519 | * @brief Sets the priority of a thread. |
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520 | * |
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521 | * It sets the real priority of the thread. In addition it changes the current |
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522 | * priority of the thread if the new priority is higher than the current |
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523 | * priority or the thread owns no resources. |
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524 | * |
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525 | * @param[in] the_thread The thread. |
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526 | * @param[in] new_priority The new priority of the thread. |
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527 | * @param[out] old_priority The old real priority of the thread. This pointer |
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528 | * must not be @c NULL. |
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529 | * @param[in] prepend_it In case this is true, then the thread is prepended to |
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530 | * its priority group in its scheduler instance, otherwise it is appended. |
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531 | * |
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532 | * @see _Thread_Change_priority(). |
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533 | */ |
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534 | void _Thread_Set_priority( |
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535 | Thread_Control *the_thread, |
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536 | Priority_Control new_priority, |
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537 | Priority_Control *old_priority, |
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538 | bool prepend_it |
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539 | ); |
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540 | |
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541 | RTEMS_INLINE_ROUTINE Objects_Information *_Thread_Get_objects_information( |
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542 | Objects_Id id |
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543 | ) |
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544 | { |
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545 | uint32_t the_api; |
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546 | |
---|
547 | the_api = _Objects_Get_API( id ); |
---|
548 | |
---|
549 | if ( !_Objects_Is_api_valid( the_api ) ) { |
---|
550 | return NULL; |
---|
551 | } |
---|
552 | |
---|
553 | /* |
---|
554 | * Threads are always first class :) |
---|
555 | * |
---|
556 | * There is no need to validate the object class of the object identifier, |
---|
557 | * since this will be done by the object get methods. |
---|
558 | */ |
---|
559 | return _Objects_Information_table[ the_api ][ 1 ]; |
---|
560 | } |
---|
561 | |
---|
562 | /** |
---|
563 | * @brief Gets a thread by its identifier. |
---|
564 | * |
---|
565 | * @see _Objects_Get(). |
---|
566 | */ |
---|
567 | Thread_Control *_Thread_Get( |
---|
568 | Objects_Id id, |
---|
569 | ISR_lock_Context *lock_context |
---|
570 | ); |
---|
571 | |
---|
572 | RTEMS_INLINE_ROUTINE Per_CPU_Control *_Thread_Get_CPU( |
---|
573 | const Thread_Control *thread |
---|
574 | ) |
---|
575 | { |
---|
576 | #if defined(RTEMS_SMP) |
---|
577 | return thread->Scheduler.cpu; |
---|
578 | #else |
---|
579 | (void) thread; |
---|
580 | |
---|
581 | return _Per_CPU_Get(); |
---|
582 | #endif |
---|
583 | } |
---|
584 | |
---|
585 | RTEMS_INLINE_ROUTINE void _Thread_Set_CPU( |
---|
586 | Thread_Control *thread, |
---|
587 | Per_CPU_Control *cpu |
---|
588 | ) |
---|
589 | { |
---|
590 | #if defined(RTEMS_SMP) |
---|
591 | thread->Scheduler.cpu = cpu; |
---|
592 | #else |
---|
593 | (void) thread; |
---|
594 | (void) cpu; |
---|
595 | #endif |
---|
596 | } |
---|
597 | |
---|
598 | /** |
---|
599 | * This function returns true if the_thread is the currently executing |
---|
600 | * thread, and false otherwise. |
---|
601 | */ |
---|
602 | |
---|
603 | RTEMS_INLINE_ROUTINE bool _Thread_Is_executing ( |
---|
604 | const Thread_Control *the_thread |
---|
605 | ) |
---|
606 | { |
---|
607 | return ( the_thread == _Thread_Executing ); |
---|
608 | } |
---|
609 | |
---|
610 | #if defined(RTEMS_SMP) |
---|
611 | /** |
---|
612 | * @brief Returns @a true in case the thread executes currently on some |
---|
613 | * processor in the system, otherwise @a false. |
---|
614 | * |
---|
615 | * Do not confuse this with _Thread_Is_executing() which checks only the |
---|
616 | * current processor. |
---|
617 | */ |
---|
618 | RTEMS_INLINE_ROUTINE bool _Thread_Is_executing_on_a_processor( |
---|
619 | const Thread_Control *the_thread |
---|
620 | ) |
---|
621 | { |
---|
622 | return _CPU_Context_Get_is_executing( &the_thread->Registers ); |
---|
623 | } |
---|
624 | #endif |
---|
625 | |
---|
626 | /** |
---|
627 | * This function returns true if the_thread is the heir |
---|
628 | * thread, and false otherwise. |
---|
629 | */ |
---|
630 | |
---|
631 | RTEMS_INLINE_ROUTINE bool _Thread_Is_heir ( |
---|
632 | const Thread_Control *the_thread |
---|
633 | ) |
---|
634 | { |
---|
635 | return ( the_thread == _Thread_Heir ); |
---|
636 | } |
---|
637 | |
---|
638 | /** |
---|
639 | * This routine clears any blocking state for the_thread. It performs |
---|
640 | * any necessary scheduling operations including the selection of |
---|
641 | * a new heir thread. |
---|
642 | */ |
---|
643 | |
---|
644 | RTEMS_INLINE_ROUTINE void _Thread_Unblock ( |
---|
645 | Thread_Control *the_thread |
---|
646 | ) |
---|
647 | { |
---|
648 | _Thread_Clear_state( the_thread, STATES_BLOCKED ); |
---|
649 | } |
---|
650 | |
---|
651 | /** |
---|
652 | * This function returns true if the floating point context of |
---|
653 | * the_thread is currently loaded in the floating point unit, and |
---|
654 | * false otherwise. |
---|
655 | */ |
---|
656 | |
---|
657 | #if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE ) |
---|
658 | RTEMS_INLINE_ROUTINE bool _Thread_Is_allocated_fp ( |
---|
659 | const Thread_Control *the_thread |
---|
660 | ) |
---|
661 | { |
---|
662 | return ( the_thread == _Thread_Allocated_fp ); |
---|
663 | } |
---|
664 | #endif |
---|
665 | |
---|
666 | /* |
---|
667 | * If the CPU has hardware floating point, then we must address saving |
---|
668 | * and restoring it as part of the context switch. |
---|
669 | * |
---|
670 | * The second conditional compilation section selects the algorithm used |
---|
671 | * to context switch between floating point tasks. The deferred algorithm |
---|
672 | * can be significantly better in a system with few floating point tasks |
---|
673 | * because it reduces the total number of save and restore FP context |
---|
674 | * operations. However, this algorithm can not be used on all CPUs due |
---|
675 | * to unpredictable use of FP registers by some compilers for integer |
---|
676 | * operations. |
---|
677 | */ |
---|
678 | |
---|
679 | RTEMS_INLINE_ROUTINE void _Thread_Save_fp( Thread_Control *executing ) |
---|
680 | { |
---|
681 | #if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE ) |
---|
682 | #if ( CPU_USE_DEFERRED_FP_SWITCH != TRUE ) |
---|
683 | if ( executing->fp_context != NULL ) |
---|
684 | _Context_Save_fp( &executing->fp_context ); |
---|
685 | #endif |
---|
686 | #endif |
---|
687 | } |
---|
688 | |
---|
689 | RTEMS_INLINE_ROUTINE void _Thread_Restore_fp( Thread_Control *executing ) |
---|
690 | { |
---|
691 | #if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE ) |
---|
692 | #if ( CPU_USE_DEFERRED_FP_SWITCH == TRUE ) |
---|
693 | if ( (executing->fp_context != NULL) && |
---|
694 | !_Thread_Is_allocated_fp( executing ) ) { |
---|
695 | if ( _Thread_Allocated_fp != NULL ) |
---|
696 | _Context_Save_fp( &_Thread_Allocated_fp->fp_context ); |
---|
697 | _Context_Restore_fp( &executing->fp_context ); |
---|
698 | _Thread_Allocated_fp = executing; |
---|
699 | } |
---|
700 | #else |
---|
701 | if ( executing->fp_context != NULL ) |
---|
702 | _Context_Restore_fp( &executing->fp_context ); |
---|
703 | #endif |
---|
704 | #endif |
---|
705 | } |
---|
706 | |
---|
707 | /** |
---|
708 | * This routine is invoked when the currently loaded floating |
---|
709 | * point context is now longer associated with an active thread. |
---|
710 | */ |
---|
711 | |
---|
712 | #if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE ) |
---|
713 | RTEMS_INLINE_ROUTINE void _Thread_Deallocate_fp( void ) |
---|
714 | { |
---|
715 | _Thread_Allocated_fp = NULL; |
---|
716 | } |
---|
717 | #endif |
---|
718 | |
---|
719 | /** |
---|
720 | * This function returns true if dispatching is disabled, and false |
---|
721 | * otherwise. |
---|
722 | */ |
---|
723 | |
---|
724 | RTEMS_INLINE_ROUTINE bool _Thread_Is_context_switch_necessary( void ) |
---|
725 | { |
---|
726 | return ( _Thread_Dispatch_necessary ); |
---|
727 | } |
---|
728 | |
---|
729 | /** |
---|
730 | * This function returns true if the_thread is NULL and false otherwise. |
---|
731 | */ |
---|
732 | |
---|
733 | RTEMS_INLINE_ROUTINE bool _Thread_Is_null ( |
---|
734 | const Thread_Control *the_thread |
---|
735 | ) |
---|
736 | { |
---|
737 | return ( the_thread == NULL ); |
---|
738 | } |
---|
739 | |
---|
740 | /** |
---|
741 | * @brief Is proxy blocking. |
---|
742 | * |
---|
743 | * status which indicates that a proxy is blocking, and false otherwise. |
---|
744 | */ |
---|
745 | RTEMS_INLINE_ROUTINE bool _Thread_Is_proxy_blocking ( |
---|
746 | uint32_t code |
---|
747 | ) |
---|
748 | { |
---|
749 | return (code == THREAD_STATUS_PROXY_BLOCKING); |
---|
750 | } |
---|
751 | |
---|
752 | RTEMS_INLINE_ROUTINE uint32_t _Thread_Get_maximum_internal_threads(void) |
---|
753 | { |
---|
754 | /* Idle threads */ |
---|
755 | uint32_t maximum_internal_threads = |
---|
756 | rtems_configuration_get_maximum_processors(); |
---|
757 | |
---|
758 | /* MPCI thread */ |
---|
759 | #if defined(RTEMS_MULTIPROCESSING) |
---|
760 | if ( _System_state_Is_multiprocessing ) { |
---|
761 | ++maximum_internal_threads; |
---|
762 | } |
---|
763 | #endif |
---|
764 | |
---|
765 | return maximum_internal_threads; |
---|
766 | } |
---|
767 | |
---|
768 | RTEMS_INLINE_ROUTINE Thread_Control *_Thread_Internal_allocate( void ) |
---|
769 | { |
---|
770 | return (Thread_Control *) |
---|
771 | _Objects_Allocate_unprotected( &_Thread_Internal_information.Objects ); |
---|
772 | } |
---|
773 | |
---|
774 | /** |
---|
775 | * @brief Gets the heir of the processor and makes it executing. |
---|
776 | * |
---|
777 | * Must be called with interrupts disabled. The thread dispatch necessary |
---|
778 | * indicator is cleared as a side-effect. |
---|
779 | * |
---|
780 | * @return The heir thread. |
---|
781 | * |
---|
782 | * @see _Thread_Dispatch(), _Thread_Start_multitasking() and |
---|
783 | * _Thread_Dispatch_update_heir(). |
---|
784 | */ |
---|
785 | RTEMS_INLINE_ROUTINE Thread_Control *_Thread_Get_heir_and_make_it_executing( |
---|
786 | Per_CPU_Control *cpu_self |
---|
787 | ) |
---|
788 | { |
---|
789 | Thread_Control *heir; |
---|
790 | |
---|
791 | heir = cpu_self->heir; |
---|
792 | cpu_self->dispatch_necessary = false; |
---|
793 | cpu_self->executing = heir; |
---|
794 | |
---|
795 | return heir; |
---|
796 | } |
---|
797 | |
---|
798 | RTEMS_INLINE_ROUTINE void _Thread_Update_CPU_time_used( |
---|
799 | Thread_Control *the_thread, |
---|
800 | Per_CPU_Control *cpu |
---|
801 | ) |
---|
802 | { |
---|
803 | Timestamp_Control last; |
---|
804 | Timestamp_Control ran; |
---|
805 | |
---|
806 | last = cpu->cpu_usage_timestamp; |
---|
807 | _TOD_Get_uptime( &cpu->cpu_usage_timestamp ); |
---|
808 | _Timestamp_Subtract( &last, &cpu->cpu_usage_timestamp, &ran ); |
---|
809 | _Timestamp_Add_to( &the_thread->cpu_time_used, &ran ); |
---|
810 | } |
---|
811 | |
---|
812 | #if defined( RTEMS_SMP ) |
---|
813 | RTEMS_INLINE_ROUTINE void _Thread_Dispatch_update_heir( |
---|
814 | Per_CPU_Control *cpu_self, |
---|
815 | Per_CPU_Control *cpu_for_heir, |
---|
816 | Thread_Control *heir |
---|
817 | ) |
---|
818 | { |
---|
819 | _Thread_Update_CPU_time_used( cpu_for_heir->heir, cpu_for_heir ); |
---|
820 | |
---|
821 | cpu_for_heir->heir = heir; |
---|
822 | |
---|
823 | _Thread_Dispatch_request( cpu_self, cpu_for_heir ); |
---|
824 | } |
---|
825 | #endif |
---|
826 | |
---|
827 | void _Thread_Get_CPU_time_used( |
---|
828 | Thread_Control *the_thread, |
---|
829 | Timestamp_Control *cpu_time_used |
---|
830 | ); |
---|
831 | |
---|
832 | RTEMS_INLINE_ROUTINE void _Thread_Action_control_initialize( |
---|
833 | Thread_Action_control *action_control |
---|
834 | ) |
---|
835 | { |
---|
836 | _Chain_Initialize_empty( &action_control->Chain ); |
---|
837 | } |
---|
838 | |
---|
839 | RTEMS_INLINE_ROUTINE void _Thread_Action_initialize( |
---|
840 | Thread_Action *action |
---|
841 | ) |
---|
842 | { |
---|
843 | _Chain_Set_off_chain( &action->Node ); |
---|
844 | } |
---|
845 | |
---|
846 | RTEMS_INLINE_ROUTINE void _Thread_Add_post_switch_action( |
---|
847 | Thread_Control *the_thread, |
---|
848 | Thread_Action *action, |
---|
849 | Thread_Action_handler handler |
---|
850 | ) |
---|
851 | { |
---|
852 | Per_CPU_Control *cpu_of_thread; |
---|
853 | |
---|
854 | _Assert( _Thread_State_is_owner( the_thread ) ); |
---|
855 | |
---|
856 | cpu_of_thread = _Thread_Get_CPU( the_thread ); |
---|
857 | |
---|
858 | action->handler = handler; |
---|
859 | |
---|
860 | _Thread_Dispatch_request( _Per_CPU_Get(), cpu_of_thread ); |
---|
861 | |
---|
862 | _Chain_Append_if_is_off_chain_unprotected( |
---|
863 | &the_thread->Post_switch_actions.Chain, |
---|
864 | &action->Node |
---|
865 | ); |
---|
866 | } |
---|
867 | |
---|
868 | RTEMS_INLINE_ROUTINE bool _Thread_Is_life_restarting( |
---|
869 | Thread_Life_state life_state |
---|
870 | ) |
---|
871 | { |
---|
872 | return ( life_state & THREAD_LIFE_RESTARTING ) != 0; |
---|
873 | } |
---|
874 | |
---|
875 | RTEMS_INLINE_ROUTINE bool _Thread_Is_life_terminating( |
---|
876 | Thread_Life_state life_state |
---|
877 | ) |
---|
878 | { |
---|
879 | return ( life_state & THREAD_LIFE_TERMINATING ) != 0; |
---|
880 | } |
---|
881 | |
---|
882 | RTEMS_INLINE_ROUTINE bool _Thread_Is_life_change_allowed( |
---|
883 | Thread_Life_state life_state |
---|
884 | ) |
---|
885 | { |
---|
886 | return ( life_state |
---|
887 | & ( THREAD_LIFE_PROTECTED | THREAD_LIFE_CHANGE_DEFERRED ) ) == 0; |
---|
888 | } |
---|
889 | |
---|
890 | RTEMS_INLINE_ROUTINE bool _Thread_Is_life_changing( |
---|
891 | Thread_Life_state life_state |
---|
892 | ) |
---|
893 | { |
---|
894 | return ( life_state |
---|
895 | & ( THREAD_LIFE_RESTARTING | THREAD_LIFE_TERMINATING ) ) != 0; |
---|
896 | } |
---|
897 | |
---|
898 | RTEMS_INLINE_ROUTINE bool _Thread_Is_joinable( |
---|
899 | const Thread_Control *the_thread |
---|
900 | ) |
---|
901 | { |
---|
902 | _Assert( _Thread_State_is_owner( the_thread ) ); |
---|
903 | return ( the_thread->Life.state & THREAD_LIFE_DETACHED ) == 0; |
---|
904 | } |
---|
905 | |
---|
906 | /** |
---|
907 | * @brief Returns true if the thread owns resources, and false otherwise. |
---|
908 | * |
---|
909 | * Resources are accounted with the Thread_Control::resource_count resource |
---|
910 | * counter. This counter is used by semaphore objects for example. |
---|
911 | * |
---|
912 | * In addition to the resource counter there is a resource dependency tree |
---|
913 | * available on SMP configurations. In case this tree is non-empty, then the |
---|
914 | * thread owns resources. |
---|
915 | * |
---|
916 | * @param[in] the_thread The thread. |
---|
917 | */ |
---|
918 | RTEMS_INLINE_ROUTINE bool _Thread_Owns_resources( |
---|
919 | const Thread_Control *the_thread |
---|
920 | ) |
---|
921 | { |
---|
922 | bool owns_resources = the_thread->resource_count != 0; |
---|
923 | |
---|
924 | #if defined(RTEMS_SMP) |
---|
925 | owns_resources = owns_resources |
---|
926 | || _Resource_Node_owns_resources( &the_thread->Resource_node ); |
---|
927 | #endif |
---|
928 | |
---|
929 | return owns_resources; |
---|
930 | } |
---|
931 | |
---|
932 | /** |
---|
933 | * @brief Returns the priority of the thread. |
---|
934 | * |
---|
935 | * Returns the user API and thread wait information relevant thread priority. |
---|
936 | * This includes temporary thread priority adjustments due to locking |
---|
937 | * protocols, a job release or the POSIX sporadic server for example. |
---|
938 | * |
---|
939 | * @return The priority of the thread. |
---|
940 | * |
---|
941 | * @see _Scheduler_Node_get_priority(). |
---|
942 | */ |
---|
943 | RTEMS_INLINE_ROUTINE Priority_Control _Thread_Get_priority( |
---|
944 | const Thread_Control *the_thread |
---|
945 | ) |
---|
946 | { |
---|
947 | return the_thread->current_priority; |
---|
948 | } |
---|
949 | |
---|
950 | /** |
---|
951 | * @brief Acquires the thread wait default lock inside a critical section |
---|
952 | * (interrupts disabled). |
---|
953 | * |
---|
954 | * @param[in] the_thread The thread. |
---|
955 | * @param[in] lock_context The lock context used for the corresponding lock |
---|
956 | * release. |
---|
957 | * |
---|
958 | * @see _Thread_Wait_release_default_critical(). |
---|
959 | */ |
---|
960 | RTEMS_INLINE_ROUTINE void _Thread_Wait_acquire_default_critical( |
---|
961 | Thread_Control *the_thread, |
---|
962 | ISR_lock_Context *lock_context |
---|
963 | ) |
---|
964 | { |
---|
965 | _ISR_lock_Acquire( &the_thread->Wait.Lock.Default, lock_context ); |
---|
966 | } |
---|
967 | |
---|
968 | /** |
---|
969 | * @brief Acquires the thread wait default lock and returns the executing |
---|
970 | * thread. |
---|
971 | * |
---|
972 | * @param[in] lock_context The lock context used for the corresponding lock |
---|
973 | * release. |
---|
974 | * |
---|
975 | * @return The executing thread. |
---|
976 | * |
---|
977 | * @see _Thread_Wait_release_default(). |
---|
978 | */ |
---|
979 | RTEMS_INLINE_ROUTINE Thread_Control *_Thread_Wait_acquire_default_for_executing( |
---|
980 | ISR_lock_Context *lock_context |
---|
981 | ) |
---|
982 | { |
---|
983 | Thread_Control *executing; |
---|
984 | |
---|
985 | _ISR_lock_ISR_disable( lock_context ); |
---|
986 | executing = _Thread_Executing; |
---|
987 | _Thread_Wait_acquire_default_critical( executing, lock_context ); |
---|
988 | |
---|
989 | return executing; |
---|
990 | } |
---|
991 | |
---|
992 | /** |
---|
993 | * @brief Acquires the thread wait default lock and disables interrupts. |
---|
994 | * |
---|
995 | * @param[in] the_thread The thread. |
---|
996 | * @param[in] lock_context The lock context used for the corresponding lock |
---|
997 | * release. |
---|
998 | * |
---|
999 | * @see _Thread_Wait_release_default(). |
---|
1000 | */ |
---|
1001 | RTEMS_INLINE_ROUTINE void _Thread_Wait_acquire_default( |
---|
1002 | Thread_Control *the_thread, |
---|
1003 | ISR_lock_Context *lock_context |
---|
1004 | ) |
---|
1005 | { |
---|
1006 | _ISR_lock_ISR_disable( lock_context ); |
---|
1007 | _Thread_Wait_acquire_default_critical( the_thread, lock_context ); |
---|
1008 | } |
---|
1009 | |
---|
1010 | /** |
---|
1011 | * @brief Releases the thread wait default lock inside a critical section |
---|
1012 | * (interrupts disabled). |
---|
1013 | * |
---|
1014 | * The previous interrupt status is not restored. |
---|
1015 | * |
---|
1016 | * @param[in] the_thread The thread. |
---|
1017 | * @param[in] lock_context The lock context used for the corresponding lock |
---|
1018 | * acquire. |
---|
1019 | */ |
---|
1020 | RTEMS_INLINE_ROUTINE void _Thread_Wait_release_default_critical( |
---|
1021 | Thread_Control *the_thread, |
---|
1022 | ISR_lock_Context *lock_context |
---|
1023 | ) |
---|
1024 | { |
---|
1025 | _ISR_lock_Release( &the_thread->Wait.Lock.Default, lock_context ); |
---|
1026 | } |
---|
1027 | |
---|
1028 | /** |
---|
1029 | * @brief Releases the thread wait default lock and restores the previous |
---|
1030 | * interrupt status. |
---|
1031 | * |
---|
1032 | * @param[in] the_thread The thread. |
---|
1033 | * @param[in] lock_context The lock context used for the corresponding lock |
---|
1034 | * acquire. |
---|
1035 | */ |
---|
1036 | RTEMS_INLINE_ROUTINE void _Thread_Wait_release_default( |
---|
1037 | Thread_Control *the_thread, |
---|
1038 | ISR_lock_Context *lock_context |
---|
1039 | ) |
---|
1040 | { |
---|
1041 | _Thread_Wait_release_default_critical( the_thread, lock_context ); |
---|
1042 | _ISR_lock_ISR_enable( lock_context ); |
---|
1043 | } |
---|
1044 | |
---|
1045 | #if defined(RTEMS_SMP) |
---|
1046 | #define THREAD_QUEUE_CONTEXT_OF_REQUEST( node ) \ |
---|
1047 | RTEMS_CONTAINER_OF( node, Thread_queue_Context, Lock_context.Wait.Gate.Node ) |
---|
1048 | |
---|
1049 | RTEMS_INLINE_ROUTINE void _Thread_Wait_remove_request_locked( |
---|
1050 | Thread_Control *the_thread, |
---|
1051 | Thread_queue_Lock_context *queue_lock_context |
---|
1052 | ) |
---|
1053 | { |
---|
1054 | Chain_Node *first; |
---|
1055 | |
---|
1056 | _Chain_Extract_unprotected( &queue_lock_context->Wait.Gate.Node ); |
---|
1057 | first = _Chain_First( &the_thread->Wait.Lock.Pending_requests ); |
---|
1058 | |
---|
1059 | if ( first != _Chain_Tail( &the_thread->Wait.Lock.Pending_requests ) ) { |
---|
1060 | _Thread_queue_Gate_open( (Thread_queue_Gate *) first ); |
---|
1061 | } |
---|
1062 | } |
---|
1063 | |
---|
1064 | RTEMS_INLINE_ROUTINE void _Thread_Wait_acquire_queue_critical( |
---|
1065 | Thread_queue_Queue *queue, |
---|
1066 | Thread_queue_Lock_context *queue_lock_context |
---|
1067 | ) |
---|
1068 | { |
---|
1069 | _Thread_queue_Queue_acquire_critical( |
---|
1070 | queue, |
---|
1071 | &_Thread_Executing->Potpourri_stats, |
---|
1072 | &queue_lock_context->Lock_context |
---|
1073 | ); |
---|
1074 | } |
---|
1075 | |
---|
1076 | RTEMS_INLINE_ROUTINE void _Thread_Wait_release_queue_critical( |
---|
1077 | Thread_queue_Queue *queue, |
---|
1078 | Thread_queue_Lock_context *queue_lock_context |
---|
1079 | ) |
---|
1080 | { |
---|
1081 | _Thread_queue_Queue_release_critical( |
---|
1082 | queue, |
---|
1083 | &queue_lock_context->Lock_context |
---|
1084 | ); |
---|
1085 | } |
---|
1086 | #endif |
---|
1087 | |
---|
1088 | /** |
---|
1089 | * @brief Acquires the thread wait lock inside a critical section (interrupts |
---|
1090 | * disabled). |
---|
1091 | * |
---|
1092 | * @param[in] the_thread The thread. |
---|
1093 | * @param[in] queue_context The thread queue context for the corresponding |
---|
1094 | * _Thread_Wait_release_critical(). |
---|
1095 | * |
---|
1096 | * @see _Thread_queue_Context_initialize(). |
---|
1097 | */ |
---|
1098 | RTEMS_INLINE_ROUTINE void _Thread_Wait_acquire_critical( |
---|
1099 | Thread_Control *the_thread, |
---|
1100 | Thread_queue_Context *queue_context |
---|
1101 | ) |
---|
1102 | { |
---|
1103 | #if defined(RTEMS_SMP) |
---|
1104 | Thread_queue_Queue *queue; |
---|
1105 | |
---|
1106 | _Thread_Wait_acquire_default_critical( |
---|
1107 | the_thread, |
---|
1108 | &queue_context->Lock_context.Lock_context |
---|
1109 | ); |
---|
1110 | |
---|
1111 | queue = the_thread->Wait.queue; |
---|
1112 | queue_context->Lock_context.Wait.queue = queue; |
---|
1113 | |
---|
1114 | if ( queue != NULL ) { |
---|
1115 | _Thread_queue_Gate_add( |
---|
1116 | &the_thread->Wait.Lock.Pending_requests, |
---|
1117 | &queue_context->Lock_context.Wait.Gate |
---|
1118 | ); |
---|
1119 | _Thread_Wait_release_default_critical( |
---|
1120 | the_thread, |
---|
1121 | &queue_context->Lock_context.Lock_context |
---|
1122 | ); |
---|
1123 | _Thread_Wait_acquire_queue_critical( queue, &queue_context->Lock_context ); |
---|
1124 | |
---|
1125 | if ( queue_context->Lock_context.Wait.queue == NULL ) { |
---|
1126 | _Thread_Wait_release_queue_critical( |
---|
1127 | queue, |
---|
1128 | &queue_context->Lock_context |
---|
1129 | ); |
---|
1130 | _Thread_Wait_acquire_default_critical( |
---|
1131 | the_thread, |
---|
1132 | &queue_context->Lock_context.Lock_context |
---|
1133 | ); |
---|
1134 | _Thread_Wait_remove_request_locked( |
---|
1135 | the_thread, |
---|
1136 | &queue_context->Lock_context |
---|
1137 | ); |
---|
1138 | _Assert( the_thread->Wait.queue == NULL ); |
---|
1139 | } |
---|
1140 | } |
---|
1141 | #else |
---|
1142 | (void) the_thread; |
---|
1143 | (void) queue_context; |
---|
1144 | #endif |
---|
1145 | } |
---|
1146 | |
---|
1147 | /** |
---|
1148 | * @brief Acquires the thread wait default lock and disables interrupts. |
---|
1149 | * |
---|
1150 | * @param[in] the_thread The thread. |
---|
1151 | * @param[in] queue_context The thread queue context for the corresponding |
---|
1152 | * _Thread_Wait_release(). |
---|
1153 | */ |
---|
1154 | RTEMS_INLINE_ROUTINE void _Thread_Wait_acquire( |
---|
1155 | Thread_Control *the_thread, |
---|
1156 | Thread_queue_Context *queue_context |
---|
1157 | ) |
---|
1158 | { |
---|
1159 | _Thread_queue_Context_initialize( queue_context ); |
---|
1160 | _ISR_lock_ISR_disable( &queue_context->Lock_context.Lock_context ); |
---|
1161 | _Thread_Wait_acquire_critical( the_thread, queue_context ); |
---|
1162 | } |
---|
1163 | |
---|
1164 | /** |
---|
1165 | * @brief Releases the thread wait lock inside a critical section (interrupts |
---|
1166 | * disabled). |
---|
1167 | * |
---|
1168 | * The previous interrupt status is not restored. |
---|
1169 | * |
---|
1170 | * @param[in] the_thread The thread. |
---|
1171 | * @param[in] queue_context The thread queue context used for corresponding |
---|
1172 | * _Thread_Wait_acquire_critical(). |
---|
1173 | */ |
---|
1174 | RTEMS_INLINE_ROUTINE void _Thread_Wait_release_critical( |
---|
1175 | Thread_Control *the_thread, |
---|
1176 | Thread_queue_Context *queue_context |
---|
1177 | ) |
---|
1178 | { |
---|
1179 | #if defined(RTEMS_SMP) |
---|
1180 | Thread_queue_Queue *queue; |
---|
1181 | |
---|
1182 | queue = queue_context->Lock_context.Wait.queue; |
---|
1183 | |
---|
1184 | if ( queue != NULL ) { |
---|
1185 | _Thread_Wait_release_queue_critical( |
---|
1186 | queue, &queue_context->Lock_context |
---|
1187 | ); |
---|
1188 | _Thread_Wait_acquire_default_critical( |
---|
1189 | the_thread, |
---|
1190 | &queue_context->Lock_context.Lock_context |
---|
1191 | ); |
---|
1192 | _Thread_Wait_remove_request_locked( |
---|
1193 | the_thread, |
---|
1194 | &queue_context->Lock_context |
---|
1195 | ); |
---|
1196 | } |
---|
1197 | |
---|
1198 | _Thread_Wait_release_default_critical( |
---|
1199 | the_thread, |
---|
1200 | &queue_context->Lock_context.Lock_context |
---|
1201 | ); |
---|
1202 | #else |
---|
1203 | (void) the_thread; |
---|
1204 | (void) queue_context; |
---|
1205 | #endif |
---|
1206 | } |
---|
1207 | |
---|
1208 | /** |
---|
1209 | * @brief Releases the thread wait lock and restores the previous interrupt |
---|
1210 | * status. |
---|
1211 | * |
---|
1212 | * @param[in] the_thread The thread. |
---|
1213 | * @param[in] queue_context The thread queue context used for corresponding |
---|
1214 | * _Thread_Wait_acquire(). |
---|
1215 | */ |
---|
1216 | RTEMS_INLINE_ROUTINE void _Thread_Wait_release( |
---|
1217 | Thread_Control *the_thread, |
---|
1218 | Thread_queue_Context *queue_context |
---|
1219 | ) |
---|
1220 | { |
---|
1221 | _Thread_Wait_release_critical( the_thread, queue_context ); |
---|
1222 | _ISR_lock_ISR_enable( &queue_context->Lock_context.Lock_context ); |
---|
1223 | } |
---|
1224 | |
---|
1225 | /** |
---|
1226 | * @brief Claims the thread wait queue and operations. |
---|
1227 | * |
---|
1228 | * The caller must not be the owner of the default thread wait lock. The |
---|
1229 | * caller must be the owner of the corresponding thread queue lock. |
---|
1230 | * |
---|
1231 | * @param[in] the_thread The thread. |
---|
1232 | * @param[in] queue The new thread queue. |
---|
1233 | * @param[in] operations The new thread operations. |
---|
1234 | * |
---|
1235 | * @see _Thread_Wait_restore_default(). |
---|
1236 | */ |
---|
1237 | RTEMS_INLINE_ROUTINE void _Thread_Wait_claim( |
---|
1238 | Thread_Control *the_thread, |
---|
1239 | Thread_queue_Queue *queue, |
---|
1240 | const Thread_queue_Operations *operations |
---|
1241 | ) |
---|
1242 | { |
---|
1243 | ISR_lock_Context lock_context; |
---|
1244 | |
---|
1245 | _Thread_Wait_acquire_default_critical( the_thread, &lock_context ); |
---|
1246 | |
---|
1247 | _Assert( the_thread->Wait.queue == NULL ); |
---|
1248 | |
---|
1249 | #if defined(RTEMS_SMP) |
---|
1250 | _Chain_Initialize_empty( &the_thread->Wait.Lock.Pending_requests ); |
---|
1251 | _Chain_Initialize_node( &the_thread->Wait.Lock.Tranquilizer.Node ); |
---|
1252 | _Thread_queue_Gate_close( &the_thread->Wait.Lock.Tranquilizer ); |
---|
1253 | #endif |
---|
1254 | |
---|
1255 | the_thread->Wait.queue = queue; |
---|
1256 | the_thread->Wait.operations = operations; |
---|
1257 | |
---|
1258 | _Thread_Wait_release_default_critical( the_thread, &lock_context ); |
---|
1259 | } |
---|
1260 | |
---|
1261 | /** |
---|
1262 | * @brief Removes a thread wait lock request. |
---|
1263 | * |
---|
1264 | * On SMP configurations, removes a thread wait lock request. |
---|
1265 | * |
---|
1266 | * On other configurations, this function does nothing. |
---|
1267 | * |
---|
1268 | * @param[in] the_thread The thread. |
---|
1269 | * @param[in] queue_lock_context The thread queue lock context used for |
---|
1270 | * corresponding _Thread_Wait_acquire(). |
---|
1271 | */ |
---|
1272 | RTEMS_INLINE_ROUTINE void _Thread_Wait_remove_request( |
---|
1273 | Thread_Control *the_thread, |
---|
1274 | Thread_queue_Lock_context *queue_lock_context |
---|
1275 | ) |
---|
1276 | { |
---|
1277 | #if defined(RTEMS_SMP) |
---|
1278 | ISR_lock_Context lock_context; |
---|
1279 | |
---|
1280 | _Thread_Wait_acquire_default( the_thread, &lock_context ); |
---|
1281 | _Thread_Wait_remove_request_locked( the_thread, queue_lock_context ); |
---|
1282 | _Thread_Wait_release_default( the_thread, &lock_context ); |
---|
1283 | #else |
---|
1284 | (void) the_thread; |
---|
1285 | (void) queue_lock_context; |
---|
1286 | #endif |
---|
1287 | } |
---|
1288 | |
---|
1289 | /** |
---|
1290 | * @brief Restores the default thread wait queue and operations. |
---|
1291 | * |
---|
1292 | * The caller must be the owner of the current thread wait queue lock. |
---|
1293 | * |
---|
1294 | * On SMP configurations, the pending requests are updated to use the stale |
---|
1295 | * thread queue operations. |
---|
1296 | * |
---|
1297 | * @param[in] the_thread The thread. |
---|
1298 | * |
---|
1299 | * @see _Thread_Wait_claim(). |
---|
1300 | */ |
---|
1301 | RTEMS_INLINE_ROUTINE void _Thread_Wait_restore_default( |
---|
1302 | Thread_Control *the_thread |
---|
1303 | ) |
---|
1304 | { |
---|
1305 | #if defined(RTEMS_SMP) |
---|
1306 | ISR_lock_Context lock_context; |
---|
1307 | Chain_Node *node; |
---|
1308 | const Chain_Node *tail; |
---|
1309 | |
---|
1310 | _Thread_Wait_acquire_default_critical( the_thread, &lock_context ); |
---|
1311 | |
---|
1312 | node = _Chain_First( &the_thread->Wait.Lock.Pending_requests ); |
---|
1313 | tail = _Chain_Immutable_tail( &the_thread->Wait.Lock.Pending_requests ); |
---|
1314 | |
---|
1315 | if ( node != tail ) { |
---|
1316 | do { |
---|
1317 | Thread_queue_Context *queue_context; |
---|
1318 | |
---|
1319 | queue_context = THREAD_QUEUE_CONTEXT_OF_REQUEST( node ); |
---|
1320 | queue_context->Lock_context.Wait.queue = NULL; |
---|
1321 | |
---|
1322 | node = _Chain_Next( node ); |
---|
1323 | } while ( node != tail ); |
---|
1324 | |
---|
1325 | _Thread_queue_Gate_add( |
---|
1326 | &the_thread->Wait.Lock.Pending_requests, |
---|
1327 | &the_thread->Wait.Lock.Tranquilizer |
---|
1328 | ); |
---|
1329 | } else { |
---|
1330 | _Thread_queue_Gate_open( &the_thread->Wait.Lock.Tranquilizer ); |
---|
1331 | } |
---|
1332 | #endif |
---|
1333 | |
---|
1334 | the_thread->Wait.queue = NULL; |
---|
1335 | the_thread->Wait.operations = &_Thread_queue_Operations_default; |
---|
1336 | |
---|
1337 | #if defined(RTEMS_SMP) |
---|
1338 | _Thread_Wait_release_default_critical( the_thread, &lock_context ); |
---|
1339 | #endif |
---|
1340 | } |
---|
1341 | |
---|
1342 | /** |
---|
1343 | * @brief Tranquilizes the thread after a wait on a thread queue. |
---|
1344 | * |
---|
1345 | * After the violent blocking procedure this function makes the thread calm and |
---|
1346 | * peaceful again so that it can carry out its normal work. |
---|
1347 | * |
---|
1348 | * On SMP configurations, ensures that all pending thread wait lock requests |
---|
1349 | * completed before the thread is able to begin a new thread wait procedure. |
---|
1350 | * |
---|
1351 | * On other configurations, this function does nothing. |
---|
1352 | * |
---|
1353 | * It must be called after a _Thread_Wait_claim() exactly once |
---|
1354 | * - after the corresponding thread queue lock was released, and |
---|
1355 | * - the default wait state is restored or some other processor is about to do |
---|
1356 | * this. |
---|
1357 | * |
---|
1358 | * @param[in] the_thread The thread. |
---|
1359 | */ |
---|
1360 | RTEMS_INLINE_ROUTINE void _Thread_Wait_tranquilize( |
---|
1361 | Thread_Control *the_thread |
---|
1362 | ) |
---|
1363 | { |
---|
1364 | #if defined(RTEMS_SMP) |
---|
1365 | _Thread_queue_Gate_wait( &the_thread->Wait.Lock.Tranquilizer ); |
---|
1366 | #else |
---|
1367 | (void) the_thread; |
---|
1368 | #endif |
---|
1369 | } |
---|
1370 | |
---|
1371 | /** |
---|
1372 | * @brief Cancels a thread wait on a thread queue. |
---|
1373 | * |
---|
1374 | * @param[in] the_thread The thread. |
---|
1375 | * @param[in] queue_context The thread queue context used for corresponding |
---|
1376 | * _Thread_Wait_acquire(). |
---|
1377 | */ |
---|
1378 | RTEMS_INLINE_ROUTINE void _Thread_Wait_cancel( |
---|
1379 | Thread_Control *the_thread, |
---|
1380 | Thread_queue_Context *queue_context |
---|
1381 | ) |
---|
1382 | { |
---|
1383 | Thread_queue_Queue *queue; |
---|
1384 | |
---|
1385 | queue = the_thread->Wait.queue; |
---|
1386 | |
---|
1387 | #if defined(RTEMS_SMP) |
---|
1388 | if ( queue != NULL ) { |
---|
1389 | _Assert( queue_context->Lock_context.Wait.queue == queue ); |
---|
1390 | #endif |
---|
1391 | |
---|
1392 | ( *the_thread->Wait.operations->extract )( queue, the_thread ); |
---|
1393 | _Thread_Wait_restore_default( the_thread ); |
---|
1394 | |
---|
1395 | #if defined(RTEMS_SMP) |
---|
1396 | _Assert( queue_context->Lock_context.Wait.queue == NULL ); |
---|
1397 | queue_context->Lock_context.Wait.queue = queue; |
---|
1398 | } |
---|
1399 | #endif |
---|
1400 | } |
---|
1401 | |
---|
1402 | /** |
---|
1403 | * @brief The initial thread wait flags value set by _Thread_Initialize(). |
---|
1404 | */ |
---|
1405 | #define THREAD_WAIT_FLAGS_INITIAL 0x0U |
---|
1406 | |
---|
1407 | /** |
---|
1408 | * @brief Mask to get the thread wait state flags. |
---|
1409 | */ |
---|
1410 | #define THREAD_WAIT_STATE_MASK 0xffU |
---|
1411 | |
---|
1412 | /** |
---|
1413 | * @brief Indicates that the thread begins with the blocking operation. |
---|
1414 | * |
---|
1415 | * A blocking operation consists of an optional watchdog initialization and the |
---|
1416 | * setting of the appropriate thread blocking state with the corresponding |
---|
1417 | * scheduler block operation. |
---|
1418 | */ |
---|
1419 | #define THREAD_WAIT_STATE_INTEND_TO_BLOCK 0x1U |
---|
1420 | |
---|
1421 | /** |
---|
1422 | * @brief Indicates that the thread completed the blocking operation. |
---|
1423 | */ |
---|
1424 | #define THREAD_WAIT_STATE_BLOCKED 0x2U |
---|
1425 | |
---|
1426 | /** |
---|
1427 | * @brief Indicates that a condition to end the thread wait occurred. |
---|
1428 | * |
---|
1429 | * This could be a timeout, a signal, an event or a resource availability. |
---|
1430 | */ |
---|
1431 | #define THREAD_WAIT_STATE_READY_AGAIN 0x4U |
---|
1432 | |
---|
1433 | /** |
---|
1434 | * @brief Mask to get the thread wait class flags. |
---|
1435 | */ |
---|
1436 | #define THREAD_WAIT_CLASS_MASK 0xff00U |
---|
1437 | |
---|
1438 | /** |
---|
1439 | * @brief Indicates that the thread waits for an event. |
---|
1440 | */ |
---|
1441 | #define THREAD_WAIT_CLASS_EVENT 0x100U |
---|
1442 | |
---|
1443 | /** |
---|
1444 | * @brief Indicates that the thread waits for a system event. |
---|
1445 | */ |
---|
1446 | #define THREAD_WAIT_CLASS_SYSTEM_EVENT 0x200U |
---|
1447 | |
---|
1448 | /** |
---|
1449 | * @brief Indicates that the thread waits for an object. |
---|
1450 | */ |
---|
1451 | #define THREAD_WAIT_CLASS_OBJECT 0x400U |
---|
1452 | |
---|
1453 | /** |
---|
1454 | * @brief Indicates that the thread waits for a period. |
---|
1455 | */ |
---|
1456 | #define THREAD_WAIT_CLASS_PERIOD 0x800U |
---|
1457 | |
---|
1458 | RTEMS_INLINE_ROUTINE void _Thread_Wait_flags_set( |
---|
1459 | Thread_Control *the_thread, |
---|
1460 | Thread_Wait_flags flags |
---|
1461 | ) |
---|
1462 | { |
---|
1463 | #if defined(RTEMS_SMP) |
---|
1464 | _Atomic_Store_uint( &the_thread->Wait.flags, flags, ATOMIC_ORDER_RELAXED ); |
---|
1465 | #else |
---|
1466 | the_thread->Wait.flags = flags; |
---|
1467 | #endif |
---|
1468 | } |
---|
1469 | |
---|
1470 | RTEMS_INLINE_ROUTINE Thread_Wait_flags _Thread_Wait_flags_get( |
---|
1471 | const Thread_Control *the_thread |
---|
1472 | ) |
---|
1473 | { |
---|
1474 | #if defined(RTEMS_SMP) |
---|
1475 | return _Atomic_Load_uint( &the_thread->Wait.flags, ATOMIC_ORDER_RELAXED ); |
---|
1476 | #else |
---|
1477 | return the_thread->Wait.flags; |
---|
1478 | #endif |
---|
1479 | } |
---|
1480 | |
---|
1481 | /** |
---|
1482 | * @brief Tries to change the thread wait flags with release semantics in case |
---|
1483 | * of success. |
---|
1484 | * |
---|
1485 | * Must be called inside a critical section (interrupts disabled). |
---|
1486 | * |
---|
1487 | * In case the wait flags are equal to the expected wait flags, then the wait |
---|
1488 | * flags are set to the desired wait flags. |
---|
1489 | * |
---|
1490 | * @param[in] the_thread The thread. |
---|
1491 | * @param[in] expected_flags The expected wait flags. |
---|
1492 | * @param[in] desired_flags The desired wait flags. |
---|
1493 | * |
---|
1494 | * @retval true The wait flags were equal to the expected wait flags. |
---|
1495 | * @retval false Otherwise. |
---|
1496 | */ |
---|
1497 | RTEMS_INLINE_ROUTINE bool _Thread_Wait_flags_try_change_release( |
---|
1498 | Thread_Control *the_thread, |
---|
1499 | Thread_Wait_flags expected_flags, |
---|
1500 | Thread_Wait_flags desired_flags |
---|
1501 | ) |
---|
1502 | { |
---|
1503 | _Assert( _ISR_Get_level() != 0 ); |
---|
1504 | |
---|
1505 | #if defined(RTEMS_SMP) |
---|
1506 | return _Atomic_Compare_exchange_uint( |
---|
1507 | &the_thread->Wait.flags, |
---|
1508 | &expected_flags, |
---|
1509 | desired_flags, |
---|
1510 | ATOMIC_ORDER_RELEASE, |
---|
1511 | ATOMIC_ORDER_RELAXED |
---|
1512 | ); |
---|
1513 | #else |
---|
1514 | bool success = ( the_thread->Wait.flags == expected_flags ); |
---|
1515 | |
---|
1516 | if ( success ) { |
---|
1517 | the_thread->Wait.flags = desired_flags; |
---|
1518 | } |
---|
1519 | |
---|
1520 | return success; |
---|
1521 | #endif |
---|
1522 | } |
---|
1523 | |
---|
1524 | /** |
---|
1525 | * @brief Tries to change the thread wait flags with acquire semantics. |
---|
1526 | * |
---|
1527 | * In case the wait flags are equal to the expected wait flags, then the wait |
---|
1528 | * flags are set to the desired wait flags. |
---|
1529 | * |
---|
1530 | * @param[in] the_thread The thread. |
---|
1531 | * @param[in] expected_flags The expected wait flags. |
---|
1532 | * @param[in] desired_flags The desired wait flags. |
---|
1533 | * |
---|
1534 | * @retval true The wait flags were equal to the expected wait flags. |
---|
1535 | * @retval false Otherwise. |
---|
1536 | */ |
---|
1537 | RTEMS_INLINE_ROUTINE bool _Thread_Wait_flags_try_change_acquire( |
---|
1538 | Thread_Control *the_thread, |
---|
1539 | Thread_Wait_flags expected_flags, |
---|
1540 | Thread_Wait_flags desired_flags |
---|
1541 | ) |
---|
1542 | { |
---|
1543 | bool success; |
---|
1544 | #if defined(RTEMS_SMP) |
---|
1545 | return _Atomic_Compare_exchange_uint( |
---|
1546 | &the_thread->Wait.flags, |
---|
1547 | &expected_flags, |
---|
1548 | desired_flags, |
---|
1549 | ATOMIC_ORDER_ACQUIRE, |
---|
1550 | ATOMIC_ORDER_ACQUIRE |
---|
1551 | ); |
---|
1552 | #else |
---|
1553 | ISR_Level level; |
---|
1554 | |
---|
1555 | _ISR_Local_disable( level ); |
---|
1556 | |
---|
1557 | success = _Thread_Wait_flags_try_change_release( |
---|
1558 | the_thread, |
---|
1559 | expected_flags, |
---|
1560 | desired_flags |
---|
1561 | ); |
---|
1562 | |
---|
1563 | _ISR_Local_enable( level ); |
---|
1564 | #endif |
---|
1565 | |
---|
1566 | return success; |
---|
1567 | } |
---|
1568 | |
---|
1569 | /** |
---|
1570 | * @brief Returns the object identifier of the object containing the current |
---|
1571 | * thread wait queue. |
---|
1572 | * |
---|
1573 | * This function may be used for debug and system information purposes. The |
---|
1574 | * caller must be the owner of the thread lock. |
---|
1575 | * |
---|
1576 | * @retval 0 The thread waits on no thread queue currently, the thread wait |
---|
1577 | * queue is not contained in an object, or the current thread state provides |
---|
1578 | * insufficient information, e.g. the thread is in the middle of a blocking |
---|
1579 | * operation. |
---|
1580 | * @retval other The object identifier of the object containing the thread wait |
---|
1581 | * queue. |
---|
1582 | */ |
---|
1583 | Objects_Id _Thread_Wait_get_id( const Thread_Control *the_thread ); |
---|
1584 | |
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1585 | RTEMS_INLINE_ROUTINE Status_Control _Thread_Wait_get_status( |
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1586 | const Thread_Control *the_thread |
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1587 | ) |
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1588 | { |
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1589 | return (Status_Control) the_thread->Wait.return_code; |
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1590 | } |
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1591 | |
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1592 | /** |
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1593 | * @brief General purpose thread wait timeout. |
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1594 | * |
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1595 | * @param[in] watchdog The thread timer watchdog. |
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1596 | */ |
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1597 | void _Thread_Timeout( Watchdog_Control *watchdog ); |
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1598 | |
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1599 | RTEMS_INLINE_ROUTINE void _Thread_Timer_initialize( |
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1600 | Thread_Timer_information *timer, |
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1601 | Per_CPU_Control *cpu |
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1602 | ) |
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1603 | { |
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1604 | _ISR_lock_Initialize( &timer->Lock, "Thread Timer" ); |
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1605 | timer->header = &cpu->Watchdog.Header[ PER_CPU_WATCHDOG_RELATIVE ]; |
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1606 | _Watchdog_Preinitialize( &timer->Watchdog, cpu ); |
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1607 | } |
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1608 | |
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1609 | RTEMS_INLINE_ROUTINE void _Thread_Timer_insert_relative( |
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1610 | Thread_Control *the_thread, |
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1611 | Per_CPU_Control *cpu, |
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1612 | Watchdog_Service_routine_entry routine, |
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1613 | Watchdog_Interval ticks |
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1614 | ) |
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1615 | { |
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1616 | ISR_lock_Context lock_context; |
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1617 | |
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1618 | _ISR_lock_ISR_disable_and_acquire( &the_thread->Timer.Lock, &lock_context ); |
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1619 | |
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1620 | the_thread->Timer.header = |
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1621 | &cpu->Watchdog.Header[ PER_CPU_WATCHDOG_RELATIVE ]; |
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1622 | the_thread->Timer.Watchdog.routine = routine; |
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1623 | _Watchdog_Per_CPU_insert_relative( &the_thread->Timer.Watchdog, cpu, ticks ); |
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1624 | |
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1625 | _ISR_lock_Release_and_ISR_enable( &the_thread->Timer.Lock, &lock_context ); |
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1626 | } |
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1627 | |
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1628 | RTEMS_INLINE_ROUTINE void _Thread_Timer_insert_absolute( |
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1629 | Thread_Control *the_thread, |
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1630 | Per_CPU_Control *cpu, |
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1631 | Watchdog_Service_routine_entry routine, |
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1632 | uint64_t expire |
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1633 | ) |
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1634 | { |
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1635 | ISR_lock_Context lock_context; |
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1636 | |
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1637 | _ISR_lock_ISR_disable_and_acquire( &the_thread->Timer.Lock, &lock_context ); |
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1638 | |
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1639 | the_thread->Timer.header = |
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1640 | &cpu->Watchdog.Header[ PER_CPU_WATCHDOG_ABSOLUTE ]; |
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1641 | the_thread->Timer.Watchdog.routine = routine; |
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1642 | _Watchdog_Per_CPU_insert_absolute( &the_thread->Timer.Watchdog, cpu, expire ); |
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1643 | |
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1644 | _ISR_lock_Release_and_ISR_enable( &the_thread->Timer.Lock, &lock_context ); |
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1645 | } |
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1646 | |
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1647 | RTEMS_INLINE_ROUTINE void _Thread_Timer_remove( Thread_Control *the_thread ) |
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1648 | { |
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1649 | ISR_lock_Context lock_context; |
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1650 | |
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1651 | _ISR_lock_ISR_disable_and_acquire( &the_thread->Timer.Lock, &lock_context ); |
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1652 | |
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1653 | _Watchdog_Per_CPU_remove( |
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1654 | &the_thread->Timer.Watchdog, |
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1655 | #if defined(RTEMS_SMP) |
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1656 | the_thread->Timer.Watchdog.cpu, |
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1657 | #else |
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1658 | _Per_CPU_Get(), |
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1659 | #endif |
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1660 | the_thread->Timer.header |
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1661 | ); |
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1662 | |
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1663 | _ISR_lock_Release_and_ISR_enable( &the_thread->Timer.Lock, &lock_context ); |
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1664 | } |
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1665 | |
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1666 | RTEMS_INLINE_ROUTINE void _Thread_Remove_timer_and_unblock( |
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1667 | Thread_Control *the_thread, |
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1668 | Thread_queue_Queue *queue |
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1669 | ) |
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1670 | { |
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1671 | _Thread_Wait_tranquilize( the_thread ); |
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1672 | _Thread_Timer_remove( the_thread ); |
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1673 | |
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1674 | #if defined(RTEMS_MULTIPROCESSING) |
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1675 | if ( _Objects_Is_local_id( the_thread->Object.id ) ) { |
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1676 | _Thread_Unblock( the_thread ); |
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1677 | } else { |
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1678 | _Thread_queue_Unblock_proxy( queue, the_thread ); |
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1679 | } |
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1680 | #else |
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1681 | (void) queue; |
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1682 | _Thread_Unblock( the_thread ); |
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1683 | #endif |
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1684 | } |
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1685 | |
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1686 | /** @}*/ |
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1687 | |
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1688 | #ifdef __cplusplus |
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1689 | } |
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1690 | #endif |
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1691 | |
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1692 | #if defined(RTEMS_MULTIPROCESSING) |
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1693 | #include <rtems/score/threadmp.h> |
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1694 | #endif |
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1695 | |
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1696 | #endif |
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1697 | /* end of include file */ |
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