1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Scheduler EDF Unblock |
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5 | * @ingroup RTEMSScoreScheduler |
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6 | */ |
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7 | |
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8 | /* |
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9 | * Copyright (C) 2011 Petr Benes. |
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10 | * Copyright (C) 2011 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/scheduleredfimpl.h> |
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22 | #include <rtems/score/schedulerimpl.h> |
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23 | #include <rtems/score/thread.h> |
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24 | |
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25 | void _Scheduler_EDF_Unblock( |
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26 | const Scheduler_Control *scheduler, |
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27 | Thread_Control *the_thread, |
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28 | Scheduler_Node *node |
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29 | ) |
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30 | { |
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31 | Scheduler_EDF_Context *context; |
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32 | Scheduler_EDF_Node *the_node; |
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33 | Priority_Control priority; |
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34 | Priority_Control insert_priority; |
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35 | |
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36 | context = _Scheduler_EDF_Get_context( scheduler ); |
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37 | the_node = _Scheduler_EDF_Node_downcast( node ); |
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38 | priority = _Scheduler_Node_get_priority( &the_node->Base ); |
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39 | priority = SCHEDULER_PRIORITY_PURIFY( priority ); |
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40 | insert_priority = SCHEDULER_PRIORITY_APPEND( priority ); |
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41 | |
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42 | the_node->priority = priority; |
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43 | _Scheduler_EDF_Enqueue( context, the_node, insert_priority ); |
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44 | |
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45 | /* |
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46 | * If the thread that was unblocked is more important than the heir, |
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47 | * then we have a new heir. This may or may not result in a |
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48 | * context switch. |
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49 | * |
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50 | * Normal case: |
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51 | * If the current thread is preemptible, then we need to do |
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52 | * a context switch. |
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53 | * Pseudo-ISR case: |
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54 | * Even if the thread isn't preemptible, if the new heir is |
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55 | * a pseudo-ISR system task, we need to do a context switch. |
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56 | */ |
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57 | if ( priority < _Thread_Get_priority( _Thread_Heir ) ) { |
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58 | _Scheduler_Update_heir( |
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59 | the_thread, |
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60 | priority == ( SCHEDULER_EDF_PRIO_MSB | PRIORITY_PSEUDO_ISR ) |
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61 | ); |
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62 | } |
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63 | } |
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