1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Thread Queue Operations |
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5 | * @ingroup ScoreThreadQ |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2014. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.org/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <rtems/score/threadqimpl.h> |
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22 | #include <rtems/score/assert.h> |
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23 | #include <rtems/score/threaddispatch.h> |
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24 | #include <rtems/score/threadimpl.h> |
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25 | #include <rtems/score/watchdogimpl.h> |
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26 | |
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27 | #define THREAD_QUEUE_INTEND_TO_BLOCK \ |
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28 | (THREAD_WAIT_CLASS_OBJECT | THREAD_WAIT_STATE_INTEND_TO_BLOCK) |
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29 | |
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30 | #define THREAD_QUEUE_BLOCKED \ |
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31 | (THREAD_WAIT_CLASS_OBJECT | THREAD_WAIT_STATE_BLOCKED) |
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32 | |
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33 | #define THREAD_QUEUE_READY_AGAIN \ |
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34 | (THREAD_WAIT_CLASS_OBJECT | THREAD_WAIT_STATE_READY_AGAIN) |
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35 | |
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36 | static void _Thread_queue_Unblock( Thread_Control *the_thread ) |
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37 | { |
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38 | _Watchdog_Remove_ticks( &the_thread->Timer ); |
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39 | _Thread_Unblock( the_thread ); |
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40 | |
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41 | #if defined(RTEMS_MULTIPROCESSING) |
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42 | if ( !_Objects_Is_local_id( the_thread->Object.id ) ) { |
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43 | _Thread_MP_Free_proxy( the_thread ); |
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44 | } |
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45 | #endif |
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46 | } |
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47 | |
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48 | void _Thread_queue_Enqueue_critical( |
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49 | Thread_queue_Control *the_thread_queue, |
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50 | Thread_Control *the_thread, |
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51 | States_Control state, |
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52 | Watchdog_Interval timeout, |
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53 | uint32_t timeout_code, |
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54 | ISR_lock_Context *lock_context |
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55 | ) |
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56 | { |
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57 | const Thread_queue_Operations *operations; |
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58 | Per_CPU_Control *cpu_self; |
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59 | bool success; |
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60 | |
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61 | _Thread_Lock_set( the_thread, &the_thread_queue->Lock ); |
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62 | |
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63 | operations = the_thread_queue->operations; |
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64 | _Thread_Wait_set_queue( the_thread, the_thread_queue ); |
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65 | _Thread_Wait_set_operations( the_thread, operations ); |
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66 | |
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67 | ( *operations->enqueue )( the_thread_queue, the_thread ); |
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68 | |
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69 | _Thread_Wait_flags_set( the_thread, THREAD_QUEUE_INTEND_TO_BLOCK ); |
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70 | cpu_self = _Thread_Dispatch_disable_critical( lock_context ); |
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71 | _Thread_queue_Release( the_thread_queue, lock_context ); |
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72 | |
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73 | #if defined(RTEMS_MULTIPROCESSING) |
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74 | if ( _Thread_MP_Is_receive( the_thread ) && the_thread->receive_packet ) |
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75 | the_thread = _Thread_MP_Allocate_proxy( state ); |
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76 | else |
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77 | #endif |
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78 | /* |
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79 | * Set the blocking state for this thread queue in the thread. |
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80 | */ |
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81 | _Thread_Set_state( the_thread, state ); |
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82 | |
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83 | /* |
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84 | * If the thread wants to timeout, then schedule its timer. |
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85 | */ |
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86 | if ( timeout != WATCHDOG_NO_TIMEOUT ) { |
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87 | _Thread_Wait_set_timeout_code( the_thread, timeout_code ); |
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88 | _Watchdog_Initialize( &the_thread->Timer, _Thread_Timeout, 0, the_thread ); |
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89 | _Watchdog_Insert_ticks( &the_thread->Timer, timeout ); |
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90 | } |
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91 | |
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92 | success = _Thread_Wait_flags_try_change( |
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93 | the_thread, |
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94 | THREAD_QUEUE_INTEND_TO_BLOCK, |
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95 | THREAD_QUEUE_BLOCKED |
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96 | ); |
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97 | if ( !success ) { |
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98 | _Thread_queue_Unblock( the_thread ); |
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99 | } |
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100 | |
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101 | _Thread_Dispatch_enable( cpu_self ); |
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102 | } |
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103 | |
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104 | void _Thread_queue_Extract_locked( |
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105 | Thread_queue_Control *the_thread_queue, |
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106 | Thread_Control *the_thread |
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107 | ) |
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108 | { |
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109 | ( *the_thread_queue->operations->extract )( the_thread_queue, the_thread ); |
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110 | |
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111 | _Thread_Wait_set_queue( the_thread, NULL ); |
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112 | _Thread_Wait_restore_default_operations( the_thread ); |
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113 | _Thread_Lock_restore_default( the_thread ); |
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114 | } |
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115 | |
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116 | void _Thread_queue_Unblock_critical( |
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117 | Thread_queue_Control *the_thread_queue, |
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118 | Thread_Control *the_thread, |
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119 | ISR_lock_Context *lock_context |
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120 | ) |
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121 | { |
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122 | bool success; |
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123 | bool unblock; |
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124 | |
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125 | success = _Thread_Wait_flags_try_change_critical( |
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126 | the_thread, |
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127 | THREAD_QUEUE_INTEND_TO_BLOCK, |
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128 | THREAD_QUEUE_READY_AGAIN |
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129 | ); |
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130 | if ( success ) { |
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131 | unblock = false; |
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132 | } else { |
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133 | _Assert( _Thread_Wait_flags_get( the_thread ) == THREAD_QUEUE_BLOCKED ); |
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134 | _Thread_Wait_flags_set( the_thread, THREAD_QUEUE_READY_AGAIN ); |
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135 | unblock = true; |
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136 | } |
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137 | |
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138 | if ( unblock ) { |
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139 | Per_CPU_Control *cpu_self; |
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140 | |
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141 | cpu_self = _Thread_Dispatch_disable_critical( lock_context ); |
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142 | _Thread_queue_Release( the_thread_queue, lock_context ); |
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143 | |
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144 | _Thread_queue_Unblock( the_thread ); |
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145 | |
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146 | _Thread_Dispatch_enable( cpu_self ); |
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147 | } else { |
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148 | _Thread_queue_Release( the_thread_queue, lock_context ); |
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149 | } |
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150 | } |
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151 | |
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152 | void _Thread_queue_Extract_critical( |
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153 | Thread_queue_Control *the_thread_queue, |
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154 | Thread_Control *the_thread, |
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155 | ISR_lock_Context *lock_context |
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156 | ) |
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157 | { |
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158 | _Thread_queue_Extract_locked( the_thread_queue, the_thread ); |
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159 | _Thread_queue_Unblock_critical( the_thread_queue, the_thread, lock_context ); |
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160 | } |
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161 | |
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162 | void _Thread_queue_Extract( Thread_Control *the_thread ) |
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163 | { |
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164 | ISR_lock_Context lock_context; |
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165 | ISR_lock_Control *lock; |
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166 | Thread_queue_Control *the_thread_queue; |
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167 | |
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168 | lock = _Thread_Lock_acquire( the_thread, &lock_context ); |
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169 | |
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170 | the_thread_queue = the_thread->Wait.queue; |
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171 | |
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172 | if ( the_thread_queue != NULL ) { |
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173 | _SMP_Assert( lock == &the_thread_queue->Lock ); |
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174 | |
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175 | _Thread_queue_Extract_critical( the_thread_queue, the_thread, &lock_context ); |
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176 | } else { |
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177 | _Thread_Lock_release( lock, &lock_context ); |
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178 | } |
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179 | } |
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180 | |
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181 | Thread_Control *_Thread_queue_Dequeue( Thread_queue_Control *the_thread_queue ) |
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182 | { |
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183 | ISR_lock_Context lock_context; |
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184 | Thread_Control *the_thread; |
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185 | |
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186 | _Thread_queue_Acquire( the_thread_queue, &lock_context ); |
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187 | |
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188 | the_thread = _Thread_queue_First_locked( the_thread_queue ); |
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189 | |
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190 | if ( the_thread != NULL ) { |
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191 | _SMP_Assert( the_thread->Lock.current == &the_thread_queue->Lock ); |
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192 | |
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193 | _Thread_queue_Extract_critical( the_thread_queue, the_thread, &lock_context ); |
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194 | } else { |
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195 | _Thread_queue_Release( the_thread_queue, &lock_context ); |
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196 | } |
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197 | |
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198 | return the_thread; |
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199 | } |
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