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) 1989-2006. |
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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.rtems.com/license/LICENSE. |
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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 | #if HAVE_CONFIG_H |
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16 | #include "config.h" |
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17 | #endif |
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18 | |
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19 | #include <rtems/system.h> |
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20 | #include <rtems/score/chain.h> |
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21 | #include <rtems/score/isr.h> |
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22 | #include <rtems/score/object.h> |
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23 | #include <rtems/score/states.h> |
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24 | #include <rtems/score/thread.h> |
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25 | #include <rtems/score/threadq.h> |
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26 | #include <rtems/score/tqdata.h> |
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27 | |
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28 | /*PAGE |
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29 | * |
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30 | * _Thread_queue_Requeue |
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31 | * |
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32 | * This routine is invoked when a thread changes priority and should be |
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33 | * moved to a different position on the thread queue. |
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34 | * |
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35 | * Input parameters: |
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36 | * the_thread_queue - pointer to a threadq header |
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37 | * the_thread - pointer to a thread control block |
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38 | * |
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39 | * Output parameters: NONE |
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40 | * |
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41 | * INTERRUPT LATENCY: NONE |
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42 | */ |
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43 | |
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44 | void _Thread_queue_Requeue( |
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45 | Thread_queue_Control *the_thread_queue, |
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46 | Thread_Control *the_thread |
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47 | ) |
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48 | { |
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49 | /* just in case the thread really wasn't blocked here */ |
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50 | if ( !the_thread_queue ) { |
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51 | return; |
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52 | } |
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53 | |
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54 | switch ( the_thread_queue->discipline ) { |
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55 | case THREAD_QUEUE_DISCIPLINE_FIFO: |
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56 | /* queueing by FIFO -- nothing to do */ |
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57 | break; |
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58 | case THREAD_QUEUE_DISCIPLINE_PRIORITY: { |
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59 | Thread_queue_Control *tq = the_thread_queue; |
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60 | ISR_Level level; |
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61 | |
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62 | _ISR_Disable( level ); |
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63 | if ( _States_Is_waiting_on_thread_queue( the_thread->current_state ) ) { |
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64 | _Thread_queue_Enter_critical_section( tq ); |
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65 | _Thread_queue_Extract_priority_helper( tq, the_thread, TRUE ); |
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66 | _Thread_queue_Enqueue_priority( tq, the_thread ); |
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67 | } |
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68 | _ISR_Enable( level ); |
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69 | break; |
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70 | } |
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71 | } |
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72 | } |
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73 | |
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