4.115
Last change
on this file since 40dcafa was
40dcafa,
checked in by Sebastian Huber <sebastian.huber@…>, on 08/02/14 at 14:22:31
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Add and use RTEMS_CONTAINER_OF()
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Property mode set to
100644
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File size:
1.2 KB
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1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Thread Queue First |
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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/chainimpl.h> |
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23 | #include <rtems/score/isrlevel.h> |
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24 | #include <rtems/score/threadimpl.h> |
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25 | |
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26 | Thread_Control *_Thread_queue_First( |
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27 | Thread_queue_Control *the_thread_queue |
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28 | ) |
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29 | { |
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30 | ISR_Level level; |
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31 | Thread_Control *thread; |
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32 | |
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33 | thread = NULL; |
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34 | |
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35 | _ISR_Disable( level ); |
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36 | |
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37 | if ( the_thread_queue->discipline == THREAD_QUEUE_DISCIPLINE_FIFO ) { |
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38 | if ( !_Chain_Is_empty( &the_thread_queue->Queues.Fifo ) ) |
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39 | thread = (Thread_Control *) _Chain_First(&the_thread_queue->Queues.Fifo); |
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40 | } else { /* must be THREAD_QUEUE_DISCIPLINE_PRIORITY */ |
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41 | RBTree_Node *first; |
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42 | |
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43 | first = _RBTree_First( &the_thread_queue->Queues.Priority, RBT_LEFT ); |
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44 | if ( first ) |
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45 | thread = THREAD_RBTREE_NODE_TO_THREAD( first ); |
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46 | } |
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47 | |
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48 | _ISR_Enable( level ); |
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49 | |
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50 | return thread; |
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51 | } |
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