1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Scheduler Priority Unblock |
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5 | * @ingroup ScoreScheduler |
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6 | */ |
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7 | |
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8 | /* |
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9 | * Scheduler Handler |
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10 | * |
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11 | * Copyright (C) 2010 Gedare Bloom. |
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12 | * Copyright (C) 2011 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 | #if HAVE_CONFIG_H |
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20 | #include "config.h" |
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21 | #endif |
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22 | |
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23 | #include <rtems/score/schedulerpriorityimpl.h> |
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24 | |
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25 | void _Scheduler_priority_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_priority_Context *context; |
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32 | Scheduler_priority_Node *the_node; |
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33 | unsigned int priority; |
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34 | unsigned int unmapped_priority; |
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35 | |
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36 | context = _Scheduler_priority_Get_context( scheduler ); |
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37 | the_node = _Scheduler_priority_Node_downcast( node ); |
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38 | priority = (unsigned int ) _Scheduler_Node_get_priority( &the_node->Base ); |
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39 | unmapped_priority = SCHEDULER_PRIORITY_UNMAP( priority ); |
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40 | |
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41 | if ( unmapped_priority != the_node->Ready_queue.current_priority ) { |
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42 | _Scheduler_priority_Ready_queue_update( |
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43 | &the_node->Ready_queue, |
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44 | unmapped_priority, |
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45 | &context->Bit_map, |
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46 | &context->Ready[ 0 ] |
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47 | ); |
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48 | } |
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49 | |
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50 | _Scheduler_priority_Ready_queue_enqueue( |
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51 | &the_thread->Object.Node, |
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52 | &the_node->Ready_queue, |
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53 | &context->Bit_map |
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54 | ); |
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55 | |
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56 | /* TODO: flash critical section? */ |
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57 | |
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58 | /* |
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59 | * If the thread that was unblocked is more important than the heir, |
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60 | * then we have a new heir. This may or may not result in a |
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61 | * context switch. |
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62 | * |
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63 | * Normal case: |
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64 | * If the current thread is preemptible, then we need to do |
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65 | * a context switch. |
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66 | * Pseudo-ISR case: |
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67 | * Even if the thread isn't preemptible, if the new heir is |
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68 | * a pseudo-ISR system task, we need to do a context switch. |
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69 | */ |
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70 | if ( priority < _Thread_Get_priority( _Thread_Heir ) ) { |
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71 | _Scheduler_Update_heir( the_thread, priority == PRIORITY_PSEUDO_ISR ); |
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72 | } |
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73 | } |
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