1 | /** |
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2 | * @file rtems/score/threadq.h |
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3 | * |
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4 | * Constants and Structures Associated with the Manipulation of Objects |
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5 | * |
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6 | * This include file contains all the constants and structures associated |
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7 | * with the manipulation of objects. |
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8 | */ |
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9 | |
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10 | /* |
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11 | * COPYRIGHT (c) 1989-2014. |
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12 | * On-Line Applications Research Corporation (OAR). |
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13 | * |
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14 | * The license and distribution terms for this file may be |
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15 | * found in the file LICENSE in this distribution or at |
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16 | * http://www.rtems.org/license/LICENSE. |
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17 | */ |
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18 | |
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19 | #ifndef _RTEMS_SCORE_THREADQIMPL_H |
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20 | #define _RTEMS_SCORE_THREADQIMPL_H |
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21 | |
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22 | #include <rtems/score/threadq.h> |
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23 | #include <rtems/score/chainimpl.h> |
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24 | #include <rtems/score/rbtreeimpl.h> |
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25 | #include <rtems/score/scheduler.h> |
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26 | #include <rtems/score/smp.h> |
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27 | #include <rtems/score/thread.h> |
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28 | |
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29 | #ifdef __cplusplus |
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30 | extern "C" { |
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31 | #endif |
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32 | |
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33 | /** |
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34 | * @addtogroup ScoreThreadQueue |
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35 | */ |
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36 | /**@{*/ |
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37 | |
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38 | /** |
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39 | * @brief Thread queue with a layout compatible to struct _Thread_queue_Queue |
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40 | * defined in Newlib <sys/lock.h>. |
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41 | */ |
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42 | typedef struct { |
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43 | Thread_queue_Queue Queue; |
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44 | |
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45 | #if !defined(RTEMS_SMP) |
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46 | /* |
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47 | * The struct _Thread_queue_Queue definition is independent of the RTEMS |
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48 | * build configuration. Thus, the storage space for the SMP lock is always |
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49 | * present. In SMP configurations, the SMP lock is contained in the |
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50 | * Thread_queue_Queue. |
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51 | */ |
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52 | unsigned int reserved[2]; |
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53 | #endif |
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54 | } Thread_queue_Syslock_queue; |
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55 | |
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56 | RTEMS_INLINE_ROUTINE void _Thread_queue_Heads_initialize( |
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57 | Thread_queue_Heads *heads |
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58 | ) |
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59 | { |
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60 | #if defined(RTEMS_SMP) |
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61 | size_t i; |
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62 | |
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63 | for ( i = 0; i < _Scheduler_Count; ++i ) { |
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64 | _RBTree_Initialize_empty( &heads->Priority[ i ].Queue ); |
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65 | } |
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66 | #endif |
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67 | |
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68 | _Chain_Initialize_empty( &heads->Free_chain ); |
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69 | } |
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70 | |
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71 | RTEMS_INLINE_ROUTINE void _Thread_queue_Queue_initialize( |
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72 | Thread_queue_Queue *queue |
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73 | ) |
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74 | { |
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75 | queue->heads = NULL; |
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76 | #if defined(RTEMS_SMP) |
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77 | _SMP_ticket_lock_Initialize( &queue->Lock ); |
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78 | #endif |
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79 | } |
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80 | |
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81 | RTEMS_INLINE_ROUTINE void _Thread_queue_Queue_do_acquire_critical( |
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82 | Thread_queue_Queue *queue, |
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83 | #if defined(RTEMS_SMP) && defined(RTEMS_PROFILING) |
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84 | SMP_lock_Stats *lock_stats, |
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85 | #endif |
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86 | ISR_lock_Context *lock_context |
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87 | ) |
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88 | { |
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89 | #if defined(RTEMS_SMP) |
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90 | _SMP_ticket_lock_Acquire( |
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91 | &queue->Lock, |
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92 | lock_stats, |
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93 | &lock_context->Lock_context.Stats_context |
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94 | ); |
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95 | #else |
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96 | (void) queue; |
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97 | (void) lock_context; |
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98 | #endif |
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99 | } |
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100 | |
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101 | #if defined(RTEMS_SMP) && defined( RTEMS_PROFILING ) |
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102 | #define \ |
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103 | _Thread_queue_Queue_acquire_critical( queue, lock_stats, lock_context ) \ |
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104 | _Thread_queue_Queue_do_acquire_critical( queue, lock_stats, lock_context ) |
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105 | #else |
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106 | #define \ |
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107 | _Thread_queue_Queue_acquire_critical( queue, lock_stats, lock_context ) \ |
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108 | _Thread_queue_Queue_do_acquire_critical( queue, lock_context ) |
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109 | #endif |
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110 | |
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111 | RTEMS_INLINE_ROUTINE void _Thread_queue_Queue_release_critical( |
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112 | Thread_queue_Queue *queue, |
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113 | ISR_lock_Context *lock_context |
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114 | ) |
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115 | { |
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116 | #if defined(RTEMS_SMP) |
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117 | _SMP_ticket_lock_Release( |
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118 | &queue->Lock, |
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119 | &lock_context->Lock_context.Stats_context |
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120 | ); |
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121 | #else |
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122 | (void) queue; |
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123 | (void) lock_context; |
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124 | #endif |
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125 | } |
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126 | |
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127 | RTEMS_INLINE_ROUTINE void _Thread_queue_Queue_release( |
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128 | Thread_queue_Queue *queue, |
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129 | ISR_lock_Context *lock_context |
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130 | ) |
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131 | { |
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132 | _Thread_queue_Queue_release_critical( queue, lock_context ); |
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133 | _ISR_lock_ISR_enable( lock_context ); |
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134 | } |
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135 | |
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136 | RTEMS_INLINE_ROUTINE void _Thread_queue_Acquire_critical( |
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137 | Thread_queue_Control *the_thread_queue, |
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138 | ISR_lock_Context *lock_context |
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139 | ) |
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140 | { |
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141 | _Thread_queue_Queue_acquire_critical( |
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142 | &the_thread_queue->Queue, |
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143 | &the_thread_queue->Lock_stats, |
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144 | lock_context |
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145 | ); |
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146 | #if defined(RTEMS_DEBUG) && defined(RTEMS_SMP) |
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147 | the_thread_queue->owner = _SMP_Get_current_processor(); |
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148 | #endif |
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149 | } |
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150 | |
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151 | RTEMS_INLINE_ROUTINE void _Thread_queue_Acquire( |
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152 | Thread_queue_Control *the_thread_queue, |
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153 | ISR_lock_Context *lock_context |
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154 | ) |
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155 | { |
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156 | _ISR_lock_ISR_disable( lock_context ); |
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157 | _Thread_queue_Acquire_critical( the_thread_queue, lock_context ); |
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158 | } |
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159 | |
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160 | #if defined(RTEMS_DEBUG) |
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161 | RTEMS_INLINE_ROUTINE bool _Thread_queue_Is_lock_owner( |
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162 | const Thread_queue_Control *the_thread_queue |
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163 | ) |
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164 | { |
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165 | #if defined(RTEMS_SMP) |
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166 | return the_thread_queue->owner == _SMP_Get_current_processor(); |
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167 | #else |
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168 | return _ISR_Get_level() != 0; |
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169 | #endif |
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170 | } |
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171 | #endif |
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172 | |
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173 | RTEMS_INLINE_ROUTINE void _Thread_queue_Release_critical( |
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174 | Thread_queue_Control *the_thread_queue, |
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175 | ISR_lock_Context *lock_context |
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176 | ) |
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177 | { |
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178 | #if defined(RTEMS_DEBUG) |
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179 | _Assert( _Thread_queue_Is_lock_owner( the_thread_queue ) ); |
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180 | #if defined(RTEMS_SMP) |
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181 | the_thread_queue->owner = SMP_LOCK_NO_OWNER; |
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182 | #endif |
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183 | #endif |
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184 | _Thread_queue_Queue_release_critical( |
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185 | &the_thread_queue->Queue, |
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186 | lock_context |
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187 | ); |
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188 | } |
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189 | |
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190 | RTEMS_INLINE_ROUTINE void _Thread_queue_Release( |
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191 | Thread_queue_Control *the_thread_queue, |
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192 | ISR_lock_Context *lock_context |
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193 | ) |
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194 | { |
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195 | _Thread_queue_Release_critical( the_thread_queue, lock_context ); |
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196 | _ISR_lock_ISR_enable( lock_context ); |
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197 | } |
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198 | |
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199 | Thread_Control *_Thread_queue_Do_dequeue( |
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200 | Thread_queue_Control *the_thread_queue, |
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201 | const Thread_queue_Operations *operations |
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202 | #if defined(RTEMS_MULTIPROCESSING) |
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203 | , |
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204 | Thread_queue_MP_callout mp_callout, |
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205 | Objects_Id mp_id |
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206 | #endif |
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207 | ); |
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208 | |
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209 | /** |
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210 | * @brief Gets a pointer to a thread waiting on the_thread_queue. |
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211 | * |
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212 | * This function returns a pointer to a thread waiting on |
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213 | * the_thread_queue. The selection of this thread is based on |
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214 | * the discipline of the_thread_queue. If no threads are waiting |
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215 | * on the_thread_queue, then NULL is returned. |
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216 | * |
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217 | * - INTERRUPT LATENCY: |
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218 | * + single case |
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219 | */ |
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220 | #if defined(RTEMS_MULTIPROCESSING) |
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221 | #define _Thread_queue_Dequeue( \ |
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222 | the_thread_queue, \ |
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223 | operations, \ |
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224 | mp_callout, \ |
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225 | mp_id \ |
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226 | ) \ |
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227 | _Thread_queue_Do_dequeue( \ |
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228 | the_thread_queue, \ |
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229 | operations, \ |
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230 | mp_callout, \ |
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231 | mp_id \ |
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232 | ) |
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233 | #else |
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234 | #define _Thread_queue_Dequeue( \ |
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235 | the_thread_queue, \ |
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236 | operations, \ |
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237 | mp_callout, \ |
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238 | mp_id \ |
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239 | ) \ |
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240 | _Thread_queue_Do_dequeue( \ |
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241 | the_thread_queue, \ |
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242 | operations \ |
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243 | ) |
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244 | #endif |
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245 | |
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246 | /** |
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247 | * @brief Blocks the thread and places it on the thread queue. |
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248 | * |
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249 | * This enqueues the thread on the thread queue, blocks the thread, and |
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250 | * optionally starts the thread timer in case the timeout interval is not |
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251 | * WATCHDOG_NO_TIMEOUT. |
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252 | * |
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253 | * The caller must be the owner of the thread queue lock. This function will |
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254 | * release the thread queue lock and register it as the new thread lock. |
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255 | * Thread dispatching is disabled before the thread queue lock is released. |
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256 | * Thread dispatching is enabled once the sequence to block the thread is |
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257 | * complete. The operation to enqueue the thread on the queue is protected by |
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258 | * the thread queue lock. This makes it possible to use the thread queue lock |
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259 | * to protect the state of objects embedding the thread queue and directly |
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260 | * enter _Thread_queue_Enqueue_critical() in case the thread must block. |
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261 | * |
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262 | * @code |
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263 | * #include <rtems/score/threadqimpl.h> |
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264 | * #include <rtems/score/statesimpl.h> |
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265 | * |
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266 | * #define MUTEX_TQ_OPERATIONS &_Thread_queue_Operations_priority |
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267 | * |
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268 | * typedef struct { |
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269 | * Thread_queue_Control Queue; |
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270 | * Thread_Control *owner; |
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271 | * } Mutex; |
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272 | * |
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273 | * void _Mutex_Obtain( Mutex *mutex ) |
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274 | * { |
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275 | * ISR_lock_Context lock_context; |
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276 | * Thread_Control *executing; |
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277 | * |
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278 | * _Thread_queue_Acquire( &mutex->Queue, &lock_context ); |
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279 | * |
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280 | * executing = _Thread_Executing; |
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281 | * |
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282 | * if ( mutex->owner == NULL ) { |
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283 | * mutex->owner = executing; |
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284 | * _Thread_queue_Release( &mutex->Queue, &lock_context ); |
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285 | * } else { |
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286 | * _Thread_queue_Enqueue_critical( |
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287 | * &mutex->Queue.Queue, |
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288 | * MUTEX_TQ_OPERATIONS, |
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289 | * executing, |
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290 | * STATES_WAITING_FOR_MUTEX, |
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291 | * WATCHDOG_NO_TIMEOUT, |
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292 | * 0, |
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293 | * &lock_context |
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294 | * ); |
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295 | * } |
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296 | * } |
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297 | * @endcode |
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298 | * |
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299 | * @param[in] queue The actual thread queue. |
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300 | * @param[in] operations The thread queue operations. |
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301 | * @param[in] the_thread The thread to enqueue. |
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302 | * @param[in] state The new state of the thread. |
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303 | * @param[in] timeout Interval to wait. Use WATCHDOG_NO_TIMEOUT to block |
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304 | * potentially forever. |
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305 | * @param[in] timeout_code The return code in case a timeout occurs. |
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306 | * @param[in] lock_context The lock context of the lock acquire. |
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307 | */ |
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308 | void _Thread_queue_Enqueue_critical( |
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309 | Thread_queue_Queue *queue, |
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310 | const Thread_queue_Operations *operations, |
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311 | Thread_Control *the_thread, |
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312 | States_Control state, |
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313 | Watchdog_Interval timeout, |
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314 | uint32_t timeout_code, |
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315 | ISR_lock_Context *lock_context |
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316 | ); |
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317 | |
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318 | /** |
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319 | * @brief Acquires the thread queue lock and calls |
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320 | * _Thread_queue_Enqueue_critical(). |
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321 | */ |
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322 | RTEMS_INLINE_ROUTINE void _Thread_queue_Enqueue( |
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323 | Thread_queue_Control *the_thread_queue, |
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324 | const Thread_queue_Operations *operations, |
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325 | Thread_Control *the_thread, |
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326 | States_Control state, |
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327 | Watchdog_Interval timeout, |
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328 | uint32_t timeout_code |
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329 | ) |
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330 | { |
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331 | ISR_lock_Context lock_context; |
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332 | |
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333 | _Thread_queue_Acquire( the_thread_queue, &lock_context ); |
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334 | _Thread_queue_Enqueue_critical( |
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335 | &the_thread_queue->Queue, |
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336 | operations, |
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337 | the_thread, |
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338 | state, |
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339 | timeout, |
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340 | timeout_code, |
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341 | &lock_context |
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342 | ); |
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343 | } |
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344 | |
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345 | bool _Thread_queue_Do_extract_locked( |
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346 | Thread_queue_Queue *queue, |
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347 | const Thread_queue_Operations *operations, |
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348 | Thread_Control *the_thread |
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349 | #if defined(RTEMS_MULTIPROCESSING) |
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350 | , |
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351 | Thread_queue_MP_callout mp_callout, |
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352 | Objects_Id mp_id |
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353 | #endif |
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354 | ); |
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355 | |
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356 | /** |
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357 | * @brief Extracts the thread from the thread queue, restores the default wait |
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358 | * operations and restores the default thread lock. |
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359 | * |
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360 | * The caller must be the owner of the thread queue lock. The thread queue |
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361 | * lock is not released. |
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362 | * |
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363 | * @param[in] queue The actual thread queue. |
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364 | * @param[in] operations The thread queue operations. |
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365 | * @param[in] the_thread The thread to extract. |
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366 | * @param[in] mp_callout Callout to unblock the thread in case it is actually a |
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367 | * thread proxy. This parameter is only used on multiprocessing |
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368 | * configurations. |
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369 | * @param[in] mp_id Object identifier of the object containing the thread |
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370 | * queue. This parameter is only used on multiprocessing configurations. |
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371 | * |
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372 | * @return Returns the unblock indicator for _Thread_queue_Unblock_critical(). |
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373 | * True indicates, that this thread must be unblocked by the scheduler later in |
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374 | * _Thread_queue_Unblock_critical(), and false otherwise. In case false is |
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375 | * returned, then the thread queue enqueue procedure was interrupted. Thus it |
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376 | * will unblock itself and the thread wait information is no longer accessible, |
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377 | * since this thread may already block on another resource in an SMP |
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378 | * configuration. |
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379 | */ |
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380 | #if defined(RTEMS_MULTIPROCESSING) |
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381 | #define _Thread_queue_Extract_locked( \ |
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382 | unblock, \ |
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383 | queue, \ |
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384 | the_thread, \ |
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385 | mp_callout, \ |
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386 | mp_id \ |
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387 | ) \ |
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388 | _Thread_queue_Do_extract_locked( \ |
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389 | unblock, \ |
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390 | queue, \ |
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391 | the_thread, \ |
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392 | mp_callout, \ |
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393 | mp_id \ |
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394 | ) |
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395 | #else |
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396 | #define _Thread_queue_Extract_locked( \ |
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397 | unblock, \ |
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398 | queue, \ |
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399 | the_thread, \ |
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400 | mp_callout, \ |
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401 | mp_id \ |
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402 | ) \ |
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403 | _Thread_queue_Do_extract_locked( \ |
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404 | unblock, \ |
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405 | queue, \ |
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406 | the_thread \ |
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407 | ) |
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408 | #endif |
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409 | |
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410 | void _Thread_queue_Do_unblock_critical( |
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411 | bool unblock, |
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412 | Thread_queue_Queue *queue, |
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413 | Thread_Control *the_thread, |
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414 | #if defined(RTEMS_MULTIPROCESSING) |
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415 | Thread_queue_MP_callout mp_callout, |
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416 | Objects_Id mp_id, |
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417 | #endif |
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418 | ISR_lock_Context *lock_context |
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419 | ); |
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420 | |
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421 | /** |
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422 | * @brief Unblocks the thread which was on the thread queue before. |
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423 | * |
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424 | * The caller must be the owner of the thread queue lock. This function will |
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425 | * release the thread queue lock. Thread dispatching is disabled before the |
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426 | * thread queue lock is released and an unblock is necessary. Thread |
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427 | * dispatching is enabled once the sequence to unblock the thread is complete. |
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428 | * |
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429 | * @param[in] unblock The unblock indicator returned by |
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430 | * _Thread_queue_Extract_locked(). |
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431 | * @param[in] queue The actual thread queue. |
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432 | * @param[in] the_thread The thread to extract. |
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433 | * @param[in] mp_callout Callout to unblock the thread in case it is actually a |
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434 | * thread proxy. This parameter is only used on multiprocessing |
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435 | * configurations. |
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436 | * @param[in] mp_id Object identifier of the object containing the thread |
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437 | * queue. This parameter is only used on multiprocessing configurations. |
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438 | * @param[in] lock_context The lock context of the lock acquire. |
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439 | */ |
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440 | #if defined(RTEMS_MULTIPROCESSING) |
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441 | #define _Thread_queue_Unblock_critical( \ |
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442 | unblock, \ |
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443 | queue, \ |
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444 | the_thread, \ |
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445 | mp_callout, \ |
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446 | mp_id, \ |
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447 | lock_context \ |
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448 | ) \ |
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449 | _Thread_queue_Do_unblock_critical( \ |
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450 | unblock, \ |
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451 | queue, \ |
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452 | the_thread, \ |
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453 | mp_callout, \ |
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454 | mp_id, \ |
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455 | lock_context \ |
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456 | ) |
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457 | #else |
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458 | #define _Thread_queue_Unblock_critical( \ |
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459 | unblock, \ |
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460 | queue, \ |
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461 | the_thread, \ |
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462 | mp_callout, \ |
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463 | mp_id, \ |
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464 | lock_context \ |
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465 | ) \ |
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466 | _Thread_queue_Do_unblock_critical( \ |
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467 | unblock, \ |
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468 | queue, \ |
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469 | the_thread, \ |
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470 | lock_context \ |
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471 | ) |
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472 | #endif |
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473 | |
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474 | void _Thread_queue_Do_extract_critical( |
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475 | Thread_queue_Queue *queue, |
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476 | const Thread_queue_Operations *operations, |
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477 | Thread_Control *the_thread, |
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478 | #if defined(RTEMS_MULTIPROCESSING) |
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479 | Thread_queue_MP_callout mp_callout, |
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480 | Objects_Id mp_id, |
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481 | #endif |
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482 | ISR_lock_Context *lock_context |
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483 | ); |
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484 | |
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485 | /** |
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486 | * @brief Extracts the thread from the thread queue and unblocks it. |
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487 | * |
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488 | * The caller must be the owner of the thread queue lock. This function will |
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489 | * release the thread queue lock and restore the default thread lock. Thread |
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490 | * dispatching is disabled before the thread queue lock is released and an |
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491 | * unblock is necessary. Thread dispatching is enabled once the sequence to |
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492 | * unblock the thread is complete. This makes it possible to use the thread |
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493 | * queue lock to protect the state of objects embedding the thread queue and |
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494 | * directly enter _Thread_queue_Extract_critical() to finalize an operation in |
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495 | * case a waiting thread exists. |
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496 | * |
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497 | * @code |
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498 | * #include <rtems/score/threadqimpl.h> |
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499 | * |
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500 | * typedef struct { |
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501 | * Thread_queue_Control Queue; |
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502 | * Thread_Control *owner; |
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503 | * } Mutex; |
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504 | * |
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505 | * void _Mutex_Release( Mutex *mutex ) |
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506 | * { |
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507 | * ISR_lock_Context lock_context; |
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508 | * Thread_Control *first; |
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509 | * |
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510 | * _Thread_queue_Acquire( &mutex->Queue, &lock_context ); |
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511 | * |
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512 | * first = _Thread_queue_First_locked( &mutex->Queue ); |
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513 | * mutex->owner = first; |
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514 | * |
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515 | * if ( first != NULL ) { |
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516 | * _Thread_queue_Extract_critical( |
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517 | * &mutex->Queue.Queue, |
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518 | * mutex->Queue.operations, |
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519 | * first, |
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520 | * NULL, |
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521 | * 0, |
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522 | * &lock_context |
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523 | * ); |
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524 | * } |
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525 | * @endcode |
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526 | * |
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527 | * @param[in] queue The actual thread queue. |
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528 | * @param[in] operations The thread queue operations. |
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529 | * @param[in] the_thread The thread to extract. |
---|
530 | * @param[in] mp_callout Callout to unblock the thread in case it is actually a |
---|
531 | * thread proxy. This parameter is only used on multiprocessing |
---|
532 | * configurations. |
---|
533 | * @param[in] mp_id Object identifier of the object containing the thread |
---|
534 | * queue. This parameter is only used on multiprocessing configurations. |
---|
535 | * @param[in] lock_context The lock context of the lock acquire. |
---|
536 | */ |
---|
537 | #if defined(RTEMS_MULTIPROCESSING) |
---|
538 | #define _Thread_queue_Extract_critical( \ |
---|
539 | queue, \ |
---|
540 | operations, \ |
---|
541 | the_thread, \ |
---|
542 | mp_callout, \ |
---|
543 | mp_id, \ |
---|
544 | lock_context \ |
---|
545 | ) \ |
---|
546 | _Thread_queue_Do_extract_critical( \ |
---|
547 | queue, \ |
---|
548 | operations, \ |
---|
549 | the_thread, \ |
---|
550 | mp_callout, \ |
---|
551 | mp_id, \ |
---|
552 | lock_context \ |
---|
553 | ) |
---|
554 | #else |
---|
555 | #define _Thread_queue_Extract_critical( \ |
---|
556 | queue, \ |
---|
557 | operations, \ |
---|
558 | the_thread, \ |
---|
559 | mp_callout, \ |
---|
560 | mp_id, \ |
---|
561 | lock_context \ |
---|
562 | ) \ |
---|
563 | _Thread_queue_Do_extract_critical( \ |
---|
564 | queue, \ |
---|
565 | operations, \ |
---|
566 | the_thread, \ |
---|
567 | lock_context \ |
---|
568 | ) |
---|
569 | #endif |
---|
570 | |
---|
571 | /** |
---|
572 | * @brief Extracts thread from thread queue. |
---|
573 | * |
---|
574 | * This routine removes @a the_thread its thread queue |
---|
575 | * and cancels any timeouts associated with this blocking. |
---|
576 | * |
---|
577 | * @param[in] the_thread is the pointer to a thread control block that |
---|
578 | * is to be removed |
---|
579 | */ |
---|
580 | void _Thread_queue_Extract( Thread_Control *the_thread ); |
---|
581 | |
---|
582 | /** |
---|
583 | * @brief Extracts the_thread from the_thread_queue. |
---|
584 | * |
---|
585 | * This routine extracts the_thread from the_thread_queue |
---|
586 | * and ensures that if there is a proxy for this task on |
---|
587 | * another node, it is also dealt with. |
---|
588 | */ |
---|
589 | void _Thread_queue_Extract_with_proxy( |
---|
590 | Thread_Control *the_thread |
---|
591 | ); |
---|
592 | |
---|
593 | RTEMS_INLINE_ROUTINE bool _Thread_queue_Is_empty( |
---|
594 | const Thread_queue_Queue *queue |
---|
595 | ) |
---|
596 | { |
---|
597 | return queue->heads == NULL; |
---|
598 | } |
---|
599 | |
---|
600 | /** |
---|
601 | * @brief Returns the first thread on the thread queue if it exists, otherwise |
---|
602 | * @c NULL. |
---|
603 | * |
---|
604 | * The caller must be the owner of the thread queue lock. The thread queue |
---|
605 | * lock is not released. |
---|
606 | * |
---|
607 | * @param[in] the_thread_queue The thread queue. |
---|
608 | * @param[in] operations The thread queue operations. |
---|
609 | * |
---|
610 | * @retval NULL No thread is present on the thread queue. |
---|
611 | * @retval first The first thread on the thread queue according to the enqueue |
---|
612 | * order. |
---|
613 | */ |
---|
614 | RTEMS_INLINE_ROUTINE Thread_Control *_Thread_queue_First_locked( |
---|
615 | Thread_queue_Control *the_thread_queue, |
---|
616 | const Thread_queue_Operations *operations |
---|
617 | ) |
---|
618 | { |
---|
619 | Thread_queue_Heads *heads = the_thread_queue->Queue.heads; |
---|
620 | |
---|
621 | if ( heads != NULL ) { |
---|
622 | return ( *operations->first )( heads ); |
---|
623 | } else { |
---|
624 | return NULL; |
---|
625 | } |
---|
626 | } |
---|
627 | |
---|
628 | /** |
---|
629 | * @brief Returns the first thread on the thread queue if it exists, otherwise |
---|
630 | * @c NULL. |
---|
631 | * |
---|
632 | * @param[in] the_thread_queue The thread queue. |
---|
633 | * |
---|
634 | * @retval NULL No thread is present on the thread queue. |
---|
635 | * @retval first The first thread on the thread queue according to the enqueue |
---|
636 | * order. |
---|
637 | */ |
---|
638 | Thread_Control *_Thread_queue_First( |
---|
639 | Thread_queue_Control *the_thread_queue, |
---|
640 | const Thread_queue_Operations *operations |
---|
641 | ); |
---|
642 | |
---|
643 | /** |
---|
644 | * @brief Thread queue flush filter function. |
---|
645 | * |
---|
646 | * Called under protection of the thread queue lock by |
---|
647 | * _Thread_queue_Flush_critical() to optionally alter the thread wait |
---|
648 | * information and control the iteration. |
---|
649 | * |
---|
650 | * @param the_thread The thread to extract. This is the first parameter to |
---|
651 | * optimize for architectures that use the same register for the first |
---|
652 | * parameter and the return value. |
---|
653 | * @param queue The actual thread queue. |
---|
654 | * @param lock_context The lock context of the lock acquire. May be used to |
---|
655 | * pass additional data to the filter function via an overlay structure. The |
---|
656 | * filter function should not release or acquire the thread queue lock. |
---|
657 | * |
---|
658 | * @retval the_thread Extract this thread. |
---|
659 | * @retval NULL Do not extract this thread and stop the thread queue flush |
---|
660 | * operation. Threads that are already extracted will complete the flush |
---|
661 | * operation. |
---|
662 | */ |
---|
663 | typedef Thread_Control *( *Thread_queue_Flush_filter )( |
---|
664 | Thread_Control *the_thread, |
---|
665 | Thread_queue_Queue *queue, |
---|
666 | ISR_lock_Context *lock_context |
---|
667 | ); |
---|
668 | |
---|
669 | /** |
---|
670 | * @brief Default thread queue flush filter function. |
---|
671 | * |
---|
672 | * @param the_thread The thread to extract. |
---|
673 | * @param queue Unused. |
---|
674 | * @param lock_context Unused. |
---|
675 | * |
---|
676 | * @retval the_thread Extract this thread. |
---|
677 | */ |
---|
678 | Thread_Control *_Thread_queue_Flush_default_filter( |
---|
679 | Thread_Control *the_thread, |
---|
680 | Thread_queue_Queue *queue, |
---|
681 | ISR_lock_Context *lock_context |
---|
682 | ); |
---|
683 | |
---|
684 | size_t _Thread_queue_Do_flush_critical( |
---|
685 | Thread_queue_Queue *queue, |
---|
686 | const Thread_queue_Operations *operations, |
---|
687 | Thread_queue_Flush_filter filter, |
---|
688 | #if defined(RTEMS_MULTIPROCESSING) |
---|
689 | Thread_queue_MP_callout mp_callout, |
---|
690 | Objects_Id mp_id, |
---|
691 | #endif |
---|
692 | ISR_lock_Context *lock_context |
---|
693 | ); |
---|
694 | |
---|
695 | /** |
---|
696 | * @brief Unblocks all threads enqueued on the thread queue. |
---|
697 | * |
---|
698 | * This function iteratively extracts the first enqueued thread of the thread |
---|
699 | * queue until the thread queue is empty or the filter function indicates a |
---|
700 | * stop. The thread timers of the extracted threads are cancelled. The |
---|
701 | * extracted threads are unblocked. |
---|
702 | * |
---|
703 | * @param queue The actual thread queue. |
---|
704 | * @param operations The thread queue operations. |
---|
705 | * @param filter The filter functions is called for each thread to extract from |
---|
706 | * the thread queue. It may be used to alter the thread under protection of |
---|
707 | * the thread queue lock, for example to set the thread wait return code. |
---|
708 | * The return value of the filter function controls if the thread queue flush |
---|
709 | * operation should stop or continue. |
---|
710 | * @param mp_callout Callout to extract the proxy of a remote thread. This |
---|
711 | * parameter is only used on multiprocessing configurations. |
---|
712 | * @param mp_id Object identifier of the object containing the thread queue. |
---|
713 | * This parameter is only used on multiprocessing configurations. |
---|
714 | * |
---|
715 | * @return The count of extracted threads. |
---|
716 | */ |
---|
717 | #if defined(RTEMS_MULTIPROCESSING) |
---|
718 | #define _Thread_queue_Flush_critical( \ |
---|
719 | queue, \ |
---|
720 | operations, \ |
---|
721 | filter, \ |
---|
722 | mp_callout, \ |
---|
723 | mp_id, \ |
---|
724 | lock_context \ |
---|
725 | ) \ |
---|
726 | _Thread_queue_Do_flush_critical( \ |
---|
727 | queue, \ |
---|
728 | operations, \ |
---|
729 | filter, \ |
---|
730 | mp_callout, \ |
---|
731 | mp_id, \ |
---|
732 | lock_context \ |
---|
733 | ) |
---|
734 | #else |
---|
735 | #define _Thread_queue_Flush_critical( \ |
---|
736 | queue, \ |
---|
737 | operations, \ |
---|
738 | filter, \ |
---|
739 | mp_callout, \ |
---|
740 | mp_id, \ |
---|
741 | lock_context \ |
---|
742 | ) \ |
---|
743 | _Thread_queue_Do_flush_critical( \ |
---|
744 | queue, \ |
---|
745 | operations, \ |
---|
746 | filter, \ |
---|
747 | lock_context \ |
---|
748 | ) |
---|
749 | #endif |
---|
750 | |
---|
751 | void _Thread_queue_Initialize( Thread_queue_Control *the_thread_queue ); |
---|
752 | |
---|
753 | #if defined(RTEMS_SMP) && defined(RTEMS_DEBUG) && defined(RTEMS_PROFILING) |
---|
754 | #define THREAD_QUEUE_INITIALIZER( name ) \ |
---|
755 | { \ |
---|
756 | .Lock_stats = SMP_LOCK_STATS_INITIALIZER( name ), \ |
---|
757 | .owner = SMP_LOCK_NO_OWNER, \ |
---|
758 | .Queue = { \ |
---|
759 | .heads = NULL, \ |
---|
760 | .Lock = SMP_TICKET_LOCK_INITIALIZER, \ |
---|
761 | } \ |
---|
762 | } |
---|
763 | #elif defined(RTEMS_SMP) && defined(RTEMS_DEBUG) |
---|
764 | #define THREAD_QUEUE_INITIALIZER( name ) \ |
---|
765 | { \ |
---|
766 | .owner = SMP_LOCK_NO_OWNER, \ |
---|
767 | .Queue = { \ |
---|
768 | .heads = NULL, \ |
---|
769 | .Lock = SMP_TICKET_LOCK_INITIALIZER, \ |
---|
770 | } \ |
---|
771 | } |
---|
772 | #elif defined(RTEMS_SMP) && defined(RTEMS_PROFILING) |
---|
773 | #define THREAD_QUEUE_INITIALIZER( name ) \ |
---|
774 | { \ |
---|
775 | .Lock_stats = SMP_LOCK_STATS_INITIALIZER( name ), \ |
---|
776 | .Queue = { \ |
---|
777 | .heads = NULL, \ |
---|
778 | .Lock = SMP_TICKET_LOCK_INITIALIZER, \ |
---|
779 | } \ |
---|
780 | } |
---|
781 | #elif defined(RTEMS_SMP) |
---|
782 | #define THREAD_QUEUE_INITIALIZER( name ) \ |
---|
783 | { \ |
---|
784 | .Queue = { \ |
---|
785 | .heads = NULL, \ |
---|
786 | .Lock = SMP_TICKET_LOCK_INITIALIZER, \ |
---|
787 | } \ |
---|
788 | } |
---|
789 | #else |
---|
790 | #define THREAD_QUEUE_INITIALIZER( name ) \ |
---|
791 | { .Queue = { .heads = NULL } } |
---|
792 | #endif |
---|
793 | |
---|
794 | RTEMS_INLINE_ROUTINE void _Thread_queue_Destroy( |
---|
795 | Thread_queue_Control *the_thread_queue |
---|
796 | ) |
---|
797 | { |
---|
798 | #if defined(RTEMS_SMP) |
---|
799 | _SMP_ticket_lock_Destroy( &the_thread_queue->Queue.Lock ); |
---|
800 | _SMP_lock_Stats_destroy( &the_thread_queue->Lock_stats ); |
---|
801 | #endif |
---|
802 | } |
---|
803 | |
---|
804 | /** |
---|
805 | * @brief Boosts the priority of the thread if threads of another scheduler |
---|
806 | * instance are enqueued on the thread queue. |
---|
807 | * |
---|
808 | * The thread queue must use the priority waiting discipline. |
---|
809 | * |
---|
810 | * @param[in] queue The actual thread queue. |
---|
811 | * @param[in] the_thread The thread to boost the priority if necessary. |
---|
812 | */ |
---|
813 | #if defined(RTEMS_SMP) |
---|
814 | void _Thread_queue_Boost_priority( |
---|
815 | Thread_queue_Queue *queue, |
---|
816 | Thread_Control *the_thread |
---|
817 | ); |
---|
818 | #else |
---|
819 | RTEMS_INLINE_ROUTINE void _Thread_queue_Boost_priority( |
---|
820 | Thread_queue_Queue *queue, |
---|
821 | Thread_Control *the_thread |
---|
822 | ) |
---|
823 | { |
---|
824 | (void) queue; |
---|
825 | (void) the_thread; |
---|
826 | } |
---|
827 | #endif |
---|
828 | |
---|
829 | #if defined(RTEMS_MULTIPROCESSING) |
---|
830 | void _Thread_queue_MP_callout_do_nothing( |
---|
831 | Thread_Control *the_proxy, |
---|
832 | Objects_Id mp_id |
---|
833 | ); |
---|
834 | #endif |
---|
835 | |
---|
836 | extern const Thread_queue_Operations _Thread_queue_Operations_default; |
---|
837 | |
---|
838 | extern const Thread_queue_Operations _Thread_queue_Operations_FIFO; |
---|
839 | |
---|
840 | extern const Thread_queue_Operations _Thread_queue_Operations_priority; |
---|
841 | |
---|
842 | /**@}*/ |
---|
843 | |
---|
844 | #ifdef __cplusplus |
---|
845 | } |
---|
846 | #endif |
---|
847 | |
---|
848 | #endif |
---|
849 | /* end of include file */ |
---|