1 | /* |
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2 | * Scheduler Priority Handler / Yield |
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3 | * |
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4 | * Copyright (C) 2010 Gedare Bloom. |
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5 | * Copyright (C) 2011 On-Line Applications Research Corporation (OAR). |
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6 | * |
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7 | * The license and distribution terms for this file may be |
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8 | * found in the file LICENSE in this distribution or at |
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9 | * http://www.rtems.com/license/LICENSE. |
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10 | */ |
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11 | |
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12 | #if HAVE_CONFIG_H |
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13 | #include "config.h" |
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14 | #endif |
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15 | |
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16 | #include <rtems/system.h> |
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17 | #include <rtems/score/isr.h> |
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18 | #include <rtems/score/scheduler.h> |
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19 | #include <rtems/score/schedulerpriority.h> |
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20 | #include <rtems/score/thread.h> |
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21 | |
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22 | /* |
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23 | * INTERRUPT LATENCY: |
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24 | * ready chain |
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25 | * select heir |
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26 | */ |
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27 | |
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28 | void _Scheduler_priority_Yield(void) |
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29 | { |
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30 | Scheduler_priority_Per_thread *sched_info; |
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31 | ISR_Level level; |
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32 | Thread_Control *executing; |
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33 | Chain_Control *ready; |
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34 | |
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35 | executing = _Thread_Executing; |
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36 | sched_info = (Scheduler_priority_Per_thread *) executing->scheduler_info; |
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37 | ready = sched_info->ready_chain; |
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38 | _ISR_Disable( level ); |
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39 | if ( !_Chain_Has_only_one_node( ready ) ) { |
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40 | _Chain_Extract_unprotected( &executing->Object.Node ); |
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41 | _Chain_Append_unprotected( ready, &executing->Object.Node ); |
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42 | |
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43 | _ISR_Flash( level ); |
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44 | |
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45 | if ( _Thread_Is_heir( executing ) ) |
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46 | _Thread_Heir = (Thread_Control *) _Chain_First( ready ); |
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47 | _Thread_Dispatch_necessary = true; |
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48 | } |
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49 | else if ( !_Thread_Is_heir( executing ) ) |
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50 | _Thread_Dispatch_necessary = true; |
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51 | |
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52 | _ISR_Enable( level ); |
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53 | } |
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