1 | /* |
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2 | * Thread Queue Handler |
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3 | * |
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4 | * |
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5 | * COPYRIGHT (c) 1989-1999. |
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6 | * On-Line Applications Research Corporation (OAR). |
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7 | * |
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8 | * The license and distribution terms for this file may be |
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9 | * found in the file LICENSE in this distribution or at |
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10 | * http://www.OARcorp.com/rtems/license.html. |
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11 | * |
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12 | * $Id$ |
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13 | */ |
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14 | |
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15 | #include <rtems/system.h> |
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16 | #include <rtems/score/chain.h> |
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17 | #include <rtems/score/isr.h> |
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18 | #include <rtems/score/object.h> |
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19 | #include <rtems/score/states.h> |
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20 | #include <rtems/score/thread.h> |
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21 | #include <rtems/score/threadq.h> |
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22 | #include <rtems/score/tqdata.h> |
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23 | |
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24 | /*PAGE |
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25 | * |
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26 | * _Thread_queue_Dequeue |
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27 | * |
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28 | * This routine removes a thread from the specified threadq. If the |
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29 | * threadq discipline is FIFO, it unblocks a thread, and cancels its |
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30 | * timeout timer. Priority discipline is processed elsewhere. |
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31 | * |
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32 | * Input parameters: |
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33 | * the_thread_queue - pointer to threadq |
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34 | * |
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35 | * Output parameters: |
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36 | * returns - thread dequeued or NULL |
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37 | * |
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38 | * INTERRUPT LATENCY: |
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39 | * check sync |
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40 | */ |
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41 | |
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42 | Thread_Control *_Thread_queue_Dequeue( |
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43 | Thread_queue_Control *the_thread_queue |
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44 | ) |
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45 | { |
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46 | Thread_Control *the_thread; |
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47 | |
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48 | switch ( the_thread_queue->discipline ) { |
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49 | case THREAD_QUEUE_DISCIPLINE_FIFO: |
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50 | the_thread = _Thread_queue_Dequeue_fifo( the_thread_queue ); |
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51 | break; |
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52 | case THREAD_QUEUE_DISCIPLINE_PRIORITY: |
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53 | the_thread = _Thread_queue_Dequeue_priority( the_thread_queue ); |
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54 | break; |
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55 | default: /* this is only to prevent warnings */ |
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56 | the_thread = NULL; |
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57 | break; |
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58 | } |
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59 | |
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60 | return( the_thread ); |
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61 | } |
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62 | |
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