1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Unblocks a Thread from the Queue |
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5 | * |
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6 | * @ingroup ScoreScheduler |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (C) 2011 Petr Benes. |
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11 | * Copyright (C) 2011 On-Line Applications Research Corporation (OAR). |
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12 | * |
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13 | * The license and distribution terms for this file may be |
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14 | * found in the file LICENSE in this distribution or at |
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15 | * http://www.rtems.org/license/LICENSE. |
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16 | */ |
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17 | |
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18 | #if HAVE_CONFIG_H |
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19 | #include "config.h" |
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20 | #endif |
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21 | |
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22 | #include <rtems/score/schedulercbsimpl.h> |
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23 | #include <rtems/score/scheduleredfimpl.h> |
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24 | #include <rtems/score/schedulerimpl.h> |
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25 | #include <rtems/score/threadimpl.h> |
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26 | #include <rtems/score/watchdogimpl.h> |
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27 | |
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28 | void _Scheduler_CBS_Unblock( |
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29 | const Scheduler_Control *scheduler, |
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30 | Thread_Control *the_thread, |
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31 | Scheduler_Node *node |
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32 | ) |
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33 | { |
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34 | Scheduler_CBS_Node *the_node; |
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35 | Scheduler_CBS_Server *serv_info; |
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36 | Priority_Control priority; |
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37 | |
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38 | the_node = _Scheduler_CBS_Node_downcast( node ); |
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39 | serv_info = the_node->cbs_server; |
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40 | priority = _Scheduler_Node_get_priority( &the_node->Base.Base ); |
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41 | priority = SCHEDULER_PRIORITY_PURIFY( priority ); |
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42 | |
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43 | /* |
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44 | * Late unblock rule for deadline-driven tasks. The remaining time to |
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45 | * deadline must be sufficient to serve the remaining computation time |
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46 | * without increased utilization of this task. It might cause a deadline |
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47 | * miss of another task. |
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48 | */ |
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49 | if ( serv_info != NULL && ( priority & SCHEDULER_EDF_PRIO_MSB ) == 0 ) { |
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50 | time_t deadline = serv_info->parameters.deadline; |
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51 | time_t budget = serv_info->parameters.budget; |
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52 | uint32_t deadline_left = the_thread->cpu_time_budget; |
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53 | Priority_Control budget_left = priority - _Watchdog_Ticks_since_boot; |
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54 | |
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55 | if ( deadline * budget_left > budget * deadline_left ) { |
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56 | Thread_queue_Context queue_context; |
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57 | |
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58 | /* Put late unblocked task to background until the end of period. */ |
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59 | _Thread_queue_Context_clear_priority_updates( &queue_context ); |
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60 | _Scheduler_CBS_Cancel_job( |
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61 | scheduler, |
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62 | the_thread, |
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63 | the_node->deadline_node, |
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64 | &queue_context |
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65 | ); |
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66 | } |
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67 | } |
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68 | |
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69 | _Scheduler_EDF_Unblock( scheduler, the_thread, &the_node->Base.Base ); |
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70 | } |
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