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/thread.h> |
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27 | |
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28 | #ifdef __cplusplus |
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29 | extern "C" { |
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30 | #endif |
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31 | |
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32 | /** |
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33 | * @addtogroup ScoreThreadQueue |
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34 | */ |
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35 | /**@{*/ |
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36 | |
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37 | /** |
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38 | * @brief Thread queue with a layout compatible to struct _Thread_queue_Queue |
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39 | * defined in Newlib <sys/lock.h>. |
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40 | */ |
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41 | typedef struct { |
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42 | Thread_queue_Queue Queue; |
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43 | |
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44 | #if !defined(RTEMS_SMP) |
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45 | /* |
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46 | * The struct _Thread_queue_Queue definition is independent of the RTEMS |
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47 | * build configuration. Thus, the storage space for the SMP lock is always |
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48 | * present. In SMP configurations, the SMP lock is contained in the |
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49 | * Thread_queue_Queue. |
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50 | */ |
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51 | unsigned int reserved[2]; |
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52 | #endif |
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53 | } Thread_queue_Syslock_queue; |
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54 | |
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55 | RTEMS_INLINE_ROUTINE void _Thread_queue_Heads_initialize( |
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56 | Thread_queue_Heads *heads |
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57 | ) |
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58 | { |
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59 | #if defined(RTEMS_SMP) |
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60 | size_t i; |
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61 | |
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62 | for ( i = 0; i < _Scheduler_Count; ++i ) { |
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63 | _RBTree_Initialize_empty( &heads->Priority[ i ].Queue ); |
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64 | } |
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65 | #endif |
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66 | |
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67 | _Chain_Initialize_empty( &heads->Free_chain ); |
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68 | } |
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69 | |
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70 | RTEMS_INLINE_ROUTINE void _Thread_queue_Queue_initialize( |
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71 | Thread_queue_Queue *queue |
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72 | ) |
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73 | { |
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74 | queue->heads = NULL; |
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75 | #if defined(RTEMS_SMP) |
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76 | _SMP_ticket_lock_Initialize( &queue->Lock ); |
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77 | #endif |
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78 | } |
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79 | |
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80 | RTEMS_INLINE_ROUTINE void _Thread_queue_Queue_do_acquire_critical( |
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81 | Thread_queue_Queue *queue, |
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82 | #if defined(RTEMS_SMP) && defined(RTEMS_PROFILING) |
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83 | SMP_lock_Stats *lock_stats, |
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84 | #endif |
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85 | ISR_lock_Context *lock_context |
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86 | ) |
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87 | { |
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88 | #if defined(RTEMS_SMP) |
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89 | _SMP_ticket_lock_Acquire( |
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90 | &queue->Lock, |
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91 | lock_stats, |
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92 | &lock_context->Lock_context.Stats_context |
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93 | ); |
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94 | #else |
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95 | (void) queue; |
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96 | (void) lock_context; |
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97 | #endif |
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98 | } |
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99 | |
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100 | #if defined(RTEMS_SMP) && defined( RTEMS_PROFILING ) |
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101 | #define \ |
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102 | _Thread_queue_Queue_acquire_critical( queue, lock_stats, lock_context ) \ |
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103 | _Thread_queue_Queue_do_acquire_critical( queue, lock_stats, lock_context ) |
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104 | #else |
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105 | #define \ |
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106 | _Thread_queue_Queue_acquire_critical( queue, lock_stats, lock_context ) \ |
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107 | _Thread_queue_Queue_do_acquire_critical( queue, lock_context ) |
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108 | #endif |
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109 | |
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110 | RTEMS_INLINE_ROUTINE void _Thread_queue_Queue_release( |
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111 | Thread_queue_Queue *queue, |
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112 | ISR_lock_Context *lock_context |
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113 | ) |
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114 | { |
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115 | #if defined(RTEMS_SMP) |
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116 | _SMP_ticket_lock_Release( |
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117 | &queue->Lock, |
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118 | &lock_context->Lock_context.Stats_context |
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119 | ); |
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120 | #endif |
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121 | _ISR_lock_ISR_enable( lock_context ); |
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122 | } |
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123 | |
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124 | RTEMS_INLINE_ROUTINE void _Thread_queue_Acquire_critical( |
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125 | Thread_queue_Control *the_thread_queue, |
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126 | ISR_lock_Context *lock_context |
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127 | ) |
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128 | { |
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129 | _Thread_queue_Queue_acquire_critical( |
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130 | &the_thread_queue->Queue, |
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131 | &the_thread_queue->Lock_stats, |
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132 | lock_context |
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133 | ); |
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134 | } |
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135 | |
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136 | RTEMS_INLINE_ROUTINE void _Thread_queue_Acquire( |
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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 | _ISR_lock_ISR_disable( lock_context ); |
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142 | _Thread_queue_Acquire_critical( the_thread_queue, lock_context ); |
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143 | } |
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144 | |
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145 | RTEMS_INLINE_ROUTINE void _Thread_queue_Release( |
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146 | Thread_queue_Control *the_thread_queue, |
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147 | ISR_lock_Context *lock_context |
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148 | ) |
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149 | { |
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150 | _Thread_queue_Queue_release( |
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151 | &the_thread_queue->Queue, |
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152 | lock_context |
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153 | ); |
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154 | } |
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155 | |
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156 | #if defined(RTEMS_MULTIPROCESSING) |
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157 | /** |
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158 | * @brief Multiprocessing (MP) support callout for thread queue operations. |
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159 | * |
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160 | * @param the_proxy The thread proxy of the thread queue operation. A thread |
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161 | * control is actually a thread proxy if and only if |
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162 | * _Objects_Is_local_id( the_proxy->Object.id ) is false. |
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163 | * @param mp_id Object identifier of the object containing the thread queue. |
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164 | */ |
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165 | typedef void ( *Thread_queue_MP_callout )( |
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166 | Thread_Control *the_proxy, |
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167 | Objects_Id mp_id |
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168 | ); |
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169 | #endif |
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170 | |
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171 | /** |
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172 | * @brief Gets a pointer to a thread waiting on the_thread_queue. |
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173 | * |
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174 | * This function returns a pointer to a thread waiting on |
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175 | * the_thread_queue. The selection of this thread is based on |
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176 | * the discipline of the_thread_queue. If no threads are waiting |
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177 | * on the_thread_queue, then NULL is returned. |
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178 | * |
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179 | * - INTERRUPT LATENCY: |
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180 | * + single case |
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181 | */ |
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182 | Thread_Control *_Thread_queue_Dequeue( |
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183 | Thread_queue_Control *the_thread_queue, |
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184 | const Thread_queue_Operations *operations |
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185 | ); |
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186 | |
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187 | /** |
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188 | * @brief Blocks the thread and places it on the thread queue. |
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189 | * |
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190 | * This enqueues the thread on the thread queue, blocks the thread, and |
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191 | * optionally starts the thread timer in case the timeout interval is not |
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192 | * WATCHDOG_NO_TIMEOUT. |
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193 | * |
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194 | * The caller must be the owner of the thread queue lock. This function will |
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195 | * release the thread queue lock and register it as the new thread lock. |
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196 | * Thread dispatching is disabled before the thread queue lock is released. |
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197 | * Thread dispatching is enabled once the sequence to block the thread is |
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198 | * complete. The operation to enqueue the thread on the queue is protected by |
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199 | * the thread queue lock. This makes it possible to use the thread queue lock |
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200 | * to protect the state of objects embedding the thread queue and directly |
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201 | * enter _Thread_queue_Enqueue_critical() in case the thread must block. |
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202 | * |
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203 | * @code |
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204 | * #include <rtems/score/threadqimpl.h> |
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205 | * #include <rtems/score/statesimpl.h> |
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206 | * |
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207 | * #define MUTEX_TQ_OPERATIONS &_Thread_queue_Operations_priority |
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208 | * |
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209 | * typedef struct { |
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210 | * Thread_queue_Control Queue; |
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211 | * Thread_Control *owner; |
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212 | * } Mutex; |
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213 | * |
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214 | * void _Mutex_Obtain( Mutex *mutex ) |
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215 | * { |
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216 | * ISR_lock_Context lock_context; |
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217 | * Thread_Control *executing; |
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218 | * |
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219 | * _Thread_queue_Acquire( &mutex->Queue, &lock_context ); |
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220 | * |
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221 | * executing = _Thread_Executing; |
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222 | * |
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223 | * if ( mutex->owner == NULL ) { |
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224 | * mutex->owner = executing; |
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225 | * _Thread_queue_Release( &mutex->Queue, &lock_context ); |
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226 | * } else { |
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227 | * _Thread_queue_Enqueue_critical( |
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228 | * &mutex->Queue.Queue, |
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229 | * MUTEX_TQ_OPERATIONS, |
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230 | * executing, |
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231 | * STATES_WAITING_FOR_MUTEX, |
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232 | * WATCHDOG_NO_TIMEOUT, |
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233 | * 0, |
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234 | * &lock_context |
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235 | * ); |
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236 | * } |
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237 | * } |
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238 | * @endcode |
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239 | * |
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240 | * @param[in] queue The actual thread queue. |
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241 | * @param[in] operations The thread queue operations. |
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242 | * @param[in] the_thread The thread to enqueue. |
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243 | * @param[in] state The new state of the thread. |
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244 | * @param[in] timeout Interval to wait. Use WATCHDOG_NO_TIMEOUT to block |
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245 | * potentially forever. |
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246 | * @param[in] timeout_code The return code in case a timeout occurs. |
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247 | * @param[in] lock_context The lock context of the lock acquire. |
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248 | */ |
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249 | void _Thread_queue_Enqueue_critical( |
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250 | Thread_queue_Queue *queue, |
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251 | const Thread_queue_Operations *operations, |
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252 | Thread_Control *the_thread, |
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253 | States_Control state, |
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254 | Watchdog_Interval timeout, |
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255 | uint32_t timeout_code, |
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256 | ISR_lock_Context *lock_context |
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257 | ); |
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258 | |
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259 | /** |
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260 | * @brief Acquires the thread queue lock and calls |
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261 | * _Thread_queue_Enqueue_critical(). |
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262 | */ |
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263 | RTEMS_INLINE_ROUTINE void _Thread_queue_Enqueue( |
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264 | Thread_queue_Control *the_thread_queue, |
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265 | const Thread_queue_Operations *operations, |
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266 | Thread_Control *the_thread, |
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267 | States_Control state, |
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268 | Watchdog_Interval timeout, |
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269 | uint32_t timeout_code |
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270 | ) |
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271 | { |
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272 | ISR_lock_Context lock_context; |
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273 | |
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274 | _Thread_queue_Acquire( the_thread_queue, &lock_context ); |
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275 | _Thread_queue_Enqueue_critical( |
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276 | &the_thread_queue->Queue, |
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277 | operations, |
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278 | the_thread, |
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279 | state, |
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280 | timeout, |
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281 | timeout_code, |
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282 | &lock_context |
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283 | ); |
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284 | } |
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285 | |
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286 | /** |
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287 | * @brief Extracts the thread from the thread queue, restores the default wait |
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288 | * operations and restores the default thread lock. |
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289 | * |
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290 | * The caller must be the owner of the thread queue lock. The thread queue |
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291 | * lock is not released. |
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292 | * |
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293 | * @param[in] queue The actual thread queue. |
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294 | * @param[in] operations The thread queue operations. |
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295 | * @param[in] the_thread The thread to extract. |
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296 | * |
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297 | * @return Returns the unblock indicator for _Thread_queue_Unblock_critical(). |
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298 | * True indicates, that this thread must be unblocked by the scheduler later in |
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299 | * _Thread_queue_Unblock_critical(), and false otherwise. In case false is |
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300 | * returned, then the thread queue enqueue procedure was interrupted. Thus it |
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301 | * will unblock itself and the thread wait information is no longer accessible, |
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302 | * since this thread may already block on another resource in an SMP |
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303 | * configuration. |
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304 | */ |
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305 | bool _Thread_queue_Extract_locked( |
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306 | Thread_queue_Queue *queue, |
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307 | const Thread_queue_Operations *operations, |
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308 | Thread_Control *the_thread |
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309 | ); |
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310 | |
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311 | /** |
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312 | * @brief Unblocks the thread which was on the thread queue before. |
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313 | * |
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314 | * The caller must be the owner of the thread queue lock. This function will |
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315 | * release the thread queue lock. Thread dispatching is disabled before the |
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316 | * thread queue lock is released and an unblock is necessary. Thread |
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317 | * dispatching is enabled once the sequence to unblock the thread is complete. |
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318 | * |
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319 | * @param[in] unblock The unblock indicator returned by |
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320 | * _Thread_queue_Extract_locked(). |
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321 | * @param[in] queue The actual thread queue. |
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322 | * @param[in] the_thread The thread to extract. |
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323 | * @param[in] lock_context The lock context of the lock acquire. |
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324 | */ |
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325 | void _Thread_queue_Unblock_critical( |
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326 | bool unblock, |
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327 | Thread_queue_Queue *queue, |
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328 | Thread_Control *the_thread, |
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329 | ISR_lock_Context *lock_context |
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330 | ); |
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331 | |
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332 | /** |
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333 | * @brief Extracts the thread from the thread queue and unblocks it. |
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334 | * |
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335 | * The caller must be the owner of the thread queue lock. This function will |
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336 | * release the thread queue lock and restore the default thread lock. Thread |
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337 | * dispatching is disabled before the thread queue lock is released and an |
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338 | * unblock is necessary. Thread dispatching is enabled once the sequence to |
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339 | * unblock the thread is complete. This makes it possible to use the thread |
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340 | * queue lock to protect the state of objects embedding the thread queue and |
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341 | * directly enter _Thread_queue_Extract_critical() to finalize an operation in |
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342 | * case a waiting thread exists. |
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343 | * |
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344 | * @code |
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345 | * #include <rtems/score/threadqimpl.h> |
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346 | * |
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347 | * typedef struct { |
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348 | * Thread_queue_Control Queue; |
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349 | * Thread_Control *owner; |
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350 | * } Mutex; |
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351 | * |
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352 | * void _Mutex_Release( Mutex *mutex ) |
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353 | * { |
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354 | * ISR_lock_Context lock_context; |
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355 | * Thread_Control *first; |
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356 | * |
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357 | * _Thread_queue_Acquire( &mutex->Queue, &lock_context ); |
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358 | * |
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359 | * first = _Thread_queue_First_locked( &mutex->Queue ); |
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360 | * mutex->owner = first; |
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361 | * |
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362 | * if ( first != NULL ) { |
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363 | * _Thread_queue_Extract_critical( |
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364 | * &mutex->Queue.Queue, |
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365 | * mutex->Queue.operations, |
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366 | * first, |
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367 | * &lock_context |
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368 | * ); |
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369 | * } |
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370 | * @endcode |
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371 | * |
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372 | * @param[in] queue The actual thread queue. |
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373 | * @param[in] operations The thread queue operations. |
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374 | * @param[in] the_thread The thread to extract. |
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375 | * @param[in] lock_context The lock context of the lock acquire. |
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376 | */ |
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377 | void _Thread_queue_Extract_critical( |
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378 | Thread_queue_Queue *queue, |
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379 | const Thread_queue_Operations *operations, |
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380 | Thread_Control *the_thread, |
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381 | ISR_lock_Context *lock_context |
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382 | ); |
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383 | |
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384 | /** |
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385 | * @brief Extracts thread from thread queue. |
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386 | * |
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387 | * This routine removes @a the_thread its thread queue |
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388 | * and cancels any timeouts associated with this blocking. |
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389 | * |
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390 | * @param[in] the_thread is the pointer to a thread control block that |
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391 | * is to be removed |
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392 | */ |
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393 | void _Thread_queue_Extract( Thread_Control *the_thread ); |
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394 | |
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395 | /** |
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396 | * @brief Extracts the_thread from the_thread_queue. |
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397 | * |
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398 | * This routine extracts the_thread from the_thread_queue |
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399 | * and ensures that if there is a proxy for this task on |
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400 | * another node, it is also dealt with. |
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401 | */ |
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402 | void _Thread_queue_Extract_with_proxy( |
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403 | Thread_Control *the_thread |
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404 | ); |
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405 | |
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406 | /** |
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407 | * @brief Returns the first thread on the thread queue if it exists, otherwise |
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408 | * @c NULL. |
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409 | * |
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410 | * The caller must be the owner of the thread queue lock. The thread queue |
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411 | * lock is not released. |
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412 | * |
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413 | * @param[in] the_thread_queue The thread queue. |
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414 | * @param[in] operations The thread queue operations. |
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415 | * |
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416 | * @retval NULL No thread is present on the thread queue. |
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417 | * @retval first The first thread on the thread queue according to the enqueue |
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418 | * order. |
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419 | */ |
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420 | RTEMS_INLINE_ROUTINE Thread_Control *_Thread_queue_First_locked( |
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421 | Thread_queue_Control *the_thread_queue, |
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422 | const Thread_queue_Operations *operations |
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423 | ) |
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424 | { |
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425 | Thread_queue_Heads *heads = the_thread_queue->Queue.heads; |
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426 | |
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427 | if ( heads != NULL ) { |
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428 | return ( *operations->first )( heads ); |
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429 | } else { |
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430 | return NULL; |
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431 | } |
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432 | } |
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433 | |
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434 | /** |
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435 | * @brief Returns the first thread on the thread queue if it exists, otherwise |
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436 | * @c NULL. |
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437 | * |
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438 | * @param[in] the_thread_queue The thread queue. |
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439 | * |
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440 | * @retval NULL No thread is present on the thread queue. |
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441 | * @retval first The first thread on the thread queue according to the enqueue |
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442 | * order. |
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443 | */ |
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444 | Thread_Control *_Thread_queue_First( |
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445 | Thread_queue_Control *the_thread_queue, |
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446 | const Thread_queue_Operations *operations |
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447 | ); |
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448 | |
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449 | void _Thread_queue_Do_flush( |
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450 | Thread_queue_Control *the_thread_queue, |
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451 | const Thread_queue_Operations *operations, |
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452 | uint32_t status |
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453 | #if defined(RTEMS_MULTIPROCESSING) |
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454 | , |
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455 | Thread_queue_MP_callout mp_callout, |
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456 | Objects_Id mp_id |
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457 | #endif |
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458 | ); |
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459 | |
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460 | /** |
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461 | * @brief Unblocks all threads blocked on the thread queue. |
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462 | * |
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463 | * The thread timers of the threads are cancelled. |
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464 | * |
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465 | * @param the_thread_queue The thread queue. |
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466 | * @param operations The thread queue operations. |
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467 | * @param status The return status for the threads. |
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468 | * @param mp_callout Callout to extract the proxy of a remote thread. This |
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469 | * parameter is only used on multiprocessing configurations. |
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470 | * @param mp_id Object identifier of the object containing the thread queue. |
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471 | * This parameter is only used on multiprocessing configurations. |
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472 | */ |
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473 | #if defined(RTEMS_MULTIPROCESSING) |
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474 | #define _Thread_queue_Flush( \ |
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475 | the_thread_queue, \ |
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476 | operations, \ |
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477 | status, \ |
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478 | mp_callout, \ |
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479 | mp_id \ |
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480 | ) \ |
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481 | _Thread_queue_Do_flush( \ |
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482 | the_thread_queue, \ |
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483 | operations, \ |
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484 | status, \ |
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485 | mp_callout, \ |
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486 | mp_id \ |
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487 | ) |
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488 | #else |
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489 | #define _Thread_queue_Flush( \ |
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490 | the_thread_queue, \ |
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491 | operations, \ |
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492 | status, \ |
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493 | mp_callout, \ |
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494 | mp_id \ |
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495 | ) \ |
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496 | _Thread_queue_Do_flush( \ |
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497 | the_thread_queue, \ |
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498 | operations, \ |
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499 | status \ |
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500 | ) |
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501 | #endif |
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502 | |
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503 | void _Thread_queue_Initialize( Thread_queue_Control *the_thread_queue ); |
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504 | |
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505 | #if defined(RTEMS_SMP) && defined(RTEMS_PROFILING) |
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506 | #define THREAD_QUEUE_INITIALIZER( name ) \ |
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507 | { \ |
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508 | .Queue = { \ |
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509 | .heads = NULL, \ |
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510 | .Lock = SMP_TICKET_LOCK_INITIALIZER, \ |
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511 | }, \ |
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512 | .Lock_stats = SMP_LOCK_STATS_INITIALIZER( name ) \ |
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513 | } |
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514 | #elif defined(RTEMS_SMP) |
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515 | #define THREAD_QUEUE_INITIALIZER( name ) \ |
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516 | { \ |
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517 | .Queue = { \ |
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518 | .heads = NULL, \ |
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519 | .Lock = SMP_TICKET_LOCK_INITIALIZER, \ |
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520 | } \ |
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521 | } |
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522 | #else |
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523 | #define THREAD_QUEUE_INITIALIZER( name ) \ |
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524 | { .Queue = { .heads = NULL } } |
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525 | #endif |
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526 | |
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527 | RTEMS_INLINE_ROUTINE void _Thread_queue_Destroy( |
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528 | Thread_queue_Control *the_thread_queue |
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529 | ) |
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530 | { |
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531 | #if defined(RTEMS_SMP) |
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532 | _SMP_ticket_lock_Destroy( &the_thread_queue->Queue.Lock ); |
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533 | _SMP_lock_Stats_destroy( &the_thread_queue->Lock_stats ); |
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534 | #endif |
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535 | } |
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536 | |
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537 | /** |
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538 | * @brief Boosts the priority of the thread if threads of another scheduler |
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539 | * instance are enqueued on the thread queue. |
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540 | * |
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541 | * The thread queue must use the priority waiting discipline. |
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542 | * |
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543 | * @param[in] queue The actual thread queue. |
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544 | * @param[in] the_thread The thread to boost the priority if necessary. |
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545 | */ |
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546 | #if defined(RTEMS_SMP) |
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547 | void _Thread_queue_Boost_priority( |
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548 | Thread_queue_Queue *queue, |
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549 | Thread_Control *the_thread |
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550 | ); |
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551 | #else |
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552 | RTEMS_INLINE_ROUTINE void _Thread_queue_Boost_priority( |
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553 | Thread_queue_Queue *queue, |
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554 | Thread_Control *the_thread |
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555 | ) |
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556 | { |
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557 | (void) queue; |
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558 | (void) the_thread; |
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559 | } |
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560 | #endif |
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561 | |
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562 | /** |
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563 | * @brief Compare two thread's priority for RBTree Insertion. |
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564 | * |
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565 | * @param[in] left points to the left thread's RBnode |
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566 | * @param[in] right points to the right thread's RBnode |
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567 | * |
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568 | * @retval 1 The @a left node is more important than @a right node. |
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569 | * @retval 0 The @a left node is of equal importance with @a right node. |
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570 | * @retval 1 The @a left node is less important than @a right node. |
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571 | */ |
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572 | RBTree_Compare_result _Thread_queue_Compare_priority( |
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573 | const RBTree_Node *left, |
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574 | const RBTree_Node *right |
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575 | ); |
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576 | |
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577 | extern const Thread_queue_Operations _Thread_queue_Operations_default; |
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578 | |
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579 | extern const Thread_queue_Operations _Thread_queue_Operations_FIFO; |
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580 | |
---|
581 | extern const Thread_queue_Operations _Thread_queue_Operations_priority; |
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582 | |
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583 | /**@}*/ |
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584 | |
---|
585 | #ifdef __cplusplus |
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586 | } |
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587 | #endif |
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588 | |
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589 | #endif |
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590 | /* end of include file */ |
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