1 | /* |
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2 | * Copyright (c) 2015 embedded brains GmbH. All rights reserved. |
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3 | * |
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4 | * embedded brains GmbH |
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5 | * Dornierstr. 4 |
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6 | * 82178 Puchheim |
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7 | * Germany |
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8 | * <rtems@embedded-brains.de> |
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9 | * |
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10 | * The license and distribution terms for this file may be |
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11 | * found in the file LICENSE in this distribution or at |
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12 | * http://www.rtems.org/license/LICENSE. |
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13 | */ |
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14 | |
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15 | #if HAVE_CONFIG_H |
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16 | #include "config.h" |
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17 | #endif |
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18 | |
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19 | #if HAVE_STRUCT__THREAD_QUEUE_QUEUE |
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20 | |
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21 | #include <sys/lock.h> |
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22 | #include <errno.h> |
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23 | |
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24 | #include <rtems/score/assert.h> |
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25 | #include <rtems/score/threadimpl.h> |
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26 | #include <rtems/score/threadqimpl.h> |
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27 | #include <rtems/score/todimpl.h> |
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28 | |
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29 | #define MUTEX_TQ_OPERATIONS &_Thread_queue_Operations_priority_inherit |
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30 | |
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31 | typedef struct { |
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32 | Thread_queue_Syslock_queue Queue; |
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33 | } Mutex_Control; |
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34 | |
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35 | RTEMS_STATIC_ASSERT( |
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36 | offsetof( Mutex_Control, Queue ) |
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37 | == offsetof( struct _Mutex_Control, _Queue ), |
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38 | MUTEX_CONTROL_QUEUE |
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39 | ); |
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40 | |
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41 | RTEMS_STATIC_ASSERT( |
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42 | sizeof( Mutex_Control ) == sizeof( struct _Mutex_Control ), |
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43 | MUTEX_CONTROL_SIZE |
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44 | ); |
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45 | |
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46 | typedef struct { |
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47 | Mutex_Control Mutex; |
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48 | unsigned int nest_level; |
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49 | } Mutex_recursive_Control; |
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50 | |
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51 | RTEMS_STATIC_ASSERT( |
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52 | offsetof( Mutex_recursive_Control, Mutex ) |
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53 | == offsetof( struct _Mutex_recursive_Control, _Mutex ), |
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54 | MUTEX_RECURSIVE_CONTROL_MUTEX |
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55 | ); |
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56 | |
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57 | RTEMS_STATIC_ASSERT( |
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58 | offsetof( Mutex_recursive_Control, nest_level ) |
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59 | == offsetof( struct _Mutex_recursive_Control, _nest_level ), |
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60 | MUTEX_RECURSIVE_CONTROL_NEST_LEVEL |
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61 | ); |
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62 | |
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63 | RTEMS_STATIC_ASSERT( |
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64 | sizeof( Mutex_recursive_Control ) |
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65 | == sizeof( struct _Mutex_recursive_Control ), |
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66 | MUTEX_RECURSIVE_CONTROL_SIZE |
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67 | ); |
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68 | |
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69 | static Mutex_Control *_Mutex_Get( struct _Mutex_Control *_mutex ) |
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70 | { |
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71 | return (Mutex_Control *) _mutex; |
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72 | } |
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73 | |
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74 | static Thread_Control *_Mutex_Queue_acquire( |
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75 | Mutex_Control *mutex, |
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76 | Thread_queue_Context *queue_context |
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77 | ) |
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78 | { |
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79 | Thread_Control *executing; |
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80 | |
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81 | _ISR_lock_ISR_disable( &queue_context->Lock_context.Lock_context ); |
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82 | executing = _Thread_Executing; |
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83 | _Thread_queue_Queue_acquire_critical( |
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84 | &mutex->Queue.Queue, |
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85 | &executing->Potpourri_stats, |
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86 | &queue_context->Lock_context.Lock_context |
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87 | ); |
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88 | |
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89 | return executing; |
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90 | } |
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91 | |
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92 | static void _Mutex_Queue_release( |
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93 | Mutex_Control *mutex, |
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94 | Thread_queue_Context *queue_context |
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95 | ) |
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96 | { |
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97 | _Thread_queue_Queue_release( |
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98 | &mutex->Queue.Queue, |
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99 | &queue_context->Lock_context.Lock_context |
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100 | ); |
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101 | } |
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102 | |
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103 | static void _Mutex_Acquire_slow( |
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104 | Mutex_Control *mutex, |
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105 | Thread_Control *owner, |
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106 | Thread_Control *executing, |
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107 | Thread_queue_Context *queue_context |
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108 | ) |
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109 | { |
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110 | _Thread_queue_Context_set_expected_level( queue_context, 1 ); |
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111 | _Thread_queue_Context_set_deadlock_callout( |
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112 | queue_context, |
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113 | _Thread_queue_Deadlock_fatal |
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114 | ); |
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115 | _Thread_queue_Enqueue_critical( |
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116 | &mutex->Queue.Queue, |
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117 | MUTEX_TQ_OPERATIONS, |
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118 | executing, |
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119 | STATES_WAITING_FOR_SYS_LOCK_MUTEX, |
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120 | queue_context |
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121 | ); |
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122 | } |
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123 | |
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124 | static void _Mutex_Release_critical( |
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125 | Mutex_Control *mutex, |
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126 | Thread_Control *executing, |
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127 | Thread_queue_Context *queue_context |
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128 | ) |
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129 | { |
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130 | Thread_queue_Heads *heads; |
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131 | bool keep_priority; |
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132 | |
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133 | mutex->Queue.Queue.owner = NULL; |
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134 | |
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135 | --executing->resource_count; |
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136 | |
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137 | /* |
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138 | * Ensure that the owner resource count is visible to all other |
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139 | * processors and that we read the latest priority restore |
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140 | * hint. |
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141 | */ |
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142 | _Atomic_Fence( ATOMIC_ORDER_ACQ_REL ); |
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143 | |
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144 | heads = mutex->Queue.Queue.heads; |
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145 | keep_priority = _Thread_Owns_resources( executing ) |
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146 | || !executing->priority_restore_hint; |
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147 | |
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148 | if ( __predict_true( heads == NULL && keep_priority ) ) { |
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149 | _Mutex_Queue_release( mutex, queue_context ); |
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150 | } else { |
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151 | _Thread_queue_Surrender( |
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152 | &mutex->Queue.Queue, |
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153 | MUTEX_TQ_OPERATIONS, |
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154 | heads, |
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155 | executing, |
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156 | keep_priority, |
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157 | queue_context |
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158 | ); |
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159 | } |
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160 | } |
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161 | |
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162 | void _Mutex_Acquire( struct _Mutex_Control *_mutex ) |
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163 | { |
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164 | Mutex_Control *mutex; |
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165 | Thread_queue_Context queue_context; |
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166 | Thread_Control *executing; |
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167 | Thread_Control *owner; |
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168 | |
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169 | mutex = _Mutex_Get( _mutex ); |
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170 | _Thread_queue_Context_initialize( &queue_context ); |
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171 | executing = _Mutex_Queue_acquire( mutex, &queue_context ); |
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172 | |
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173 | owner = mutex->Queue.Queue.owner; |
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174 | |
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175 | if ( __predict_true( owner == NULL ) ) { |
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176 | mutex->Queue.Queue.owner = executing; |
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177 | ++executing->resource_count; |
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178 | _Mutex_Queue_release( mutex, &queue_context ); |
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179 | } else { |
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180 | _Thread_queue_Context_set_no_timeout( &queue_context ); |
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181 | _Mutex_Acquire_slow( mutex, owner, executing, &queue_context ); |
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182 | } |
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183 | } |
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184 | |
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185 | int _Mutex_Acquire_timed( |
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186 | struct _Mutex_Control *_mutex, |
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187 | const struct timespec *abstime |
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188 | ) |
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189 | { |
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190 | Mutex_Control *mutex; |
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191 | Thread_queue_Context queue_context; |
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192 | Thread_Control *executing; |
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193 | Thread_Control *owner; |
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194 | |
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195 | mutex = _Mutex_Get( _mutex ); |
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196 | _Thread_queue_Context_initialize( &queue_context ); |
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197 | executing = _Mutex_Queue_acquire( mutex, &queue_context ); |
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198 | |
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199 | owner = mutex->Queue.Queue.owner; |
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200 | |
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201 | if ( __predict_true( owner == NULL ) ) { |
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202 | mutex->Queue.Queue.owner = executing; |
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203 | ++executing->resource_count; |
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204 | _Mutex_Queue_release( mutex, &queue_context ); |
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205 | |
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206 | return 0; |
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207 | } else { |
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208 | Watchdog_Interval ticks; |
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209 | |
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210 | switch ( _TOD_Absolute_timeout_to_ticks( abstime, CLOCK_REALTIME, &ticks ) ) { |
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211 | case TOD_ABSOLUTE_TIMEOUT_INVALID: |
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212 | _Mutex_Queue_release( mutex, &queue_context ); |
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213 | return EINVAL; |
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214 | case TOD_ABSOLUTE_TIMEOUT_IS_IN_PAST: |
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215 | case TOD_ABSOLUTE_TIMEOUT_IS_NOW: |
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216 | _Mutex_Queue_release( mutex, &queue_context ); |
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217 | return ETIMEDOUT; |
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218 | default: |
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219 | break; |
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220 | } |
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221 | |
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222 | _Thread_queue_Context_set_relative_timeout( &queue_context, ticks ); |
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223 | _Mutex_Acquire_slow( mutex, owner, executing, &queue_context ); |
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224 | |
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225 | return STATUS_GET_POSIX( _Thread_Wait_get_status( executing ) ); |
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226 | } |
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227 | } |
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228 | |
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229 | int _Mutex_Try_acquire( struct _Mutex_Control *_mutex ) |
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230 | { |
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231 | Mutex_Control *mutex; |
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232 | Thread_queue_Context queue_context; |
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233 | Thread_Control *executing; |
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234 | Thread_Control *owner; |
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235 | int eno; |
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236 | |
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237 | mutex = _Mutex_Get( _mutex ); |
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238 | _Thread_queue_Context_initialize( &queue_context ); |
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239 | executing = _Mutex_Queue_acquire( mutex, &queue_context ); |
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240 | |
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241 | owner = mutex->Queue.Queue.owner; |
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242 | |
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243 | if ( __predict_true( owner == NULL ) ) { |
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244 | mutex->Queue.Queue.owner = executing; |
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245 | ++executing->resource_count; |
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246 | eno = 0; |
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247 | } else { |
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248 | eno = EBUSY; |
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249 | } |
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250 | |
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251 | _Mutex_Queue_release( mutex, &queue_context ); |
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252 | |
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253 | return eno; |
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254 | } |
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255 | |
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256 | void _Mutex_Release( struct _Mutex_Control *_mutex ) |
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257 | { |
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258 | Mutex_Control *mutex; |
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259 | Thread_queue_Context queue_context; |
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260 | Thread_Control *executing; |
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261 | |
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262 | mutex = _Mutex_Get( _mutex ); |
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263 | _Thread_queue_Context_initialize( &queue_context ); |
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264 | executing = _Mutex_Queue_acquire( mutex, &queue_context ); |
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265 | |
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266 | _Assert( mutex->Queue.Queue.owner == executing ); |
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267 | |
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268 | _Mutex_Release_critical( mutex, executing, &queue_context ); |
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269 | } |
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270 | |
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271 | static Mutex_recursive_Control *_Mutex_recursive_Get( |
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272 | struct _Mutex_recursive_Control *_mutex |
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273 | ) |
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274 | { |
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275 | return (Mutex_recursive_Control *) _mutex; |
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276 | } |
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277 | |
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278 | void _Mutex_recursive_Acquire( struct _Mutex_recursive_Control *_mutex ) |
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279 | { |
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280 | Mutex_recursive_Control *mutex; |
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281 | Thread_queue_Context queue_context; |
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282 | Thread_Control *executing; |
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283 | Thread_Control *owner; |
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284 | |
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285 | mutex = _Mutex_recursive_Get( _mutex ); |
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286 | _Thread_queue_Context_initialize( &queue_context ); |
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287 | executing = _Mutex_Queue_acquire( &mutex->Mutex, &queue_context ); |
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288 | |
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289 | owner = mutex->Mutex.Queue.Queue.owner; |
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290 | |
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291 | if ( __predict_true( owner == NULL ) ) { |
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292 | mutex->Mutex.Queue.Queue.owner = executing; |
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293 | ++executing->resource_count; |
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294 | _Mutex_Queue_release( &mutex->Mutex, &queue_context ); |
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295 | } else if ( owner == executing ) { |
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296 | ++mutex->nest_level; |
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297 | _Mutex_Queue_release( &mutex->Mutex, &queue_context ); |
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298 | } else { |
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299 | _Thread_queue_Context_set_no_timeout( &queue_context ); |
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300 | _Mutex_Acquire_slow( &mutex->Mutex, owner, executing, &queue_context ); |
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301 | } |
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302 | } |
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303 | |
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304 | int _Mutex_recursive_Acquire_timed( |
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305 | struct _Mutex_recursive_Control *_mutex, |
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306 | const struct timespec *abstime |
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307 | ) |
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308 | { |
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309 | Mutex_recursive_Control *mutex; |
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310 | Thread_queue_Context queue_context; |
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311 | Thread_Control *executing; |
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312 | Thread_Control *owner; |
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313 | |
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314 | mutex = _Mutex_recursive_Get( _mutex ); |
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315 | _Thread_queue_Context_initialize( &queue_context ); |
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316 | executing = _Mutex_Queue_acquire( &mutex->Mutex, &queue_context ); |
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317 | |
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318 | owner = mutex->Mutex.Queue.Queue.owner; |
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319 | |
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320 | if ( __predict_true( owner == NULL ) ) { |
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321 | mutex->Mutex.Queue.Queue.owner = executing; |
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322 | ++executing->resource_count; |
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323 | _Mutex_Queue_release( &mutex->Mutex, &queue_context ); |
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324 | |
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325 | return 0; |
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326 | } else if ( owner == executing ) { |
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327 | ++mutex->nest_level; |
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328 | _Mutex_Queue_release( &mutex->Mutex, &queue_context ); |
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329 | |
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330 | return 0; |
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331 | } else { |
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332 | Watchdog_Interval ticks; |
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333 | |
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334 | switch ( _TOD_Absolute_timeout_to_ticks( abstime, CLOCK_REALTIME, &ticks ) ) { |
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335 | case TOD_ABSOLUTE_TIMEOUT_INVALID: |
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336 | _Mutex_Queue_release( &mutex->Mutex, &queue_context ); |
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337 | return EINVAL; |
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338 | case TOD_ABSOLUTE_TIMEOUT_IS_IN_PAST: |
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339 | case TOD_ABSOLUTE_TIMEOUT_IS_NOW: |
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340 | _Mutex_Queue_release( &mutex->Mutex, &queue_context ); |
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341 | return ETIMEDOUT; |
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342 | default: |
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343 | break; |
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344 | } |
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345 | |
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346 | _Thread_queue_Context_set_relative_timeout( &queue_context, ticks ); |
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347 | _Mutex_Acquire_slow( &mutex->Mutex, owner, executing, &queue_context ); |
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348 | |
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349 | return STATUS_GET_POSIX( _Thread_Wait_get_status( executing ) ); |
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350 | } |
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351 | } |
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352 | |
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353 | int _Mutex_recursive_Try_acquire( struct _Mutex_recursive_Control *_mutex ) |
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354 | { |
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355 | Mutex_recursive_Control *mutex; |
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356 | Thread_queue_Context queue_context; |
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357 | Thread_Control *executing; |
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358 | Thread_Control *owner; |
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359 | int eno; |
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360 | |
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361 | mutex = _Mutex_recursive_Get( _mutex ); |
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362 | _Thread_queue_Context_initialize( &queue_context ); |
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363 | executing = _Mutex_Queue_acquire( &mutex->Mutex, &queue_context ); |
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364 | |
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365 | owner = mutex->Mutex.Queue.Queue.owner; |
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366 | |
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367 | if ( __predict_true( owner == NULL ) ) { |
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368 | mutex->Mutex.Queue.Queue.owner = executing; |
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369 | ++executing->resource_count; |
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370 | eno = 0; |
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371 | } else if ( owner == executing ) { |
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372 | ++mutex->nest_level; |
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373 | eno = 0; |
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374 | } else { |
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375 | eno = EBUSY; |
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376 | } |
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377 | |
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378 | _Mutex_Queue_release( &mutex->Mutex, &queue_context ); |
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379 | |
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380 | return eno; |
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381 | } |
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382 | |
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383 | void _Mutex_recursive_Release( struct _Mutex_recursive_Control *_mutex ) |
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384 | { |
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385 | Mutex_recursive_Control *mutex; |
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386 | Thread_queue_Context queue_context; |
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387 | Thread_Control *executing; |
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388 | unsigned int nest_level; |
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389 | |
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390 | mutex = _Mutex_recursive_Get( _mutex ); |
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391 | _Thread_queue_Context_initialize( &queue_context ); |
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392 | executing = _Mutex_Queue_acquire( &mutex->Mutex, &queue_context ); |
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393 | |
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394 | _Assert( mutex->Mutex.Queue.Queue.owner == executing ); |
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395 | |
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396 | nest_level = mutex->nest_level; |
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397 | |
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398 | if ( __predict_true( nest_level == 0 ) ) { |
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399 | _Mutex_Release_critical( &mutex->Mutex, executing, &queue_context ); |
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400 | } else { |
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401 | mutex->nest_level = nest_level - 1; |
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402 | |
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403 | _Mutex_Queue_release( &mutex->Mutex, &queue_context ); |
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404 | } |
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405 | } |
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406 | |
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407 | #endif /* HAVE_STRUCT__THREAD_QUEUE_QUEUE */ |
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