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) 1989-1998. |
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6 | * On-Line Applications Research Corporation (OAR). |
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7 | * Copyright assigned to U.S. Government, 1994. |
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8 | * |
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9 | * The license and distribution terms for this file may be |
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10 | * found in the file LICENSE in this distribution or at |
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11 | * http://www.OARcorp.com/rtems/license.html. |
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12 | * |
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13 | * $Id$ |
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14 | */ |
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15 | |
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16 | #include <rtems/system.h> |
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17 | #include <rtems/score/chain.h> |
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18 | #include <rtems/score/isr.h> |
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19 | #include <rtems/score/object.h> |
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20 | #include <rtems/score/states.h> |
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21 | #include <rtems/score/thread.h> |
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22 | #include <rtems/score/threadq.h> |
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23 | #include <rtems/score/tqdata.h> |
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24 | |
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25 | /*PAGE |
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26 | * |
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27 | * _Thread_queue_Timeout |
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28 | * |
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29 | * This routine processes a thread which timeouts while waiting on |
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30 | * a thread queue. It is called by the watchdog handler. |
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31 | * |
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32 | * Input parameters: |
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33 | * id - thread id |
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34 | * |
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35 | * Output parameters: NONE |
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36 | */ |
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37 | |
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38 | void _Thread_queue_Timeout( |
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39 | Objects_Id id, |
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40 | void *ignored |
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41 | ) |
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42 | { |
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43 | Thread_Control *the_thread; |
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44 | Thread_queue_Control *the_thread_queue; |
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45 | Objects_Locations location; |
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46 | |
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47 | the_thread = _Thread_Get( id, &location ); |
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48 | switch ( location ) { |
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49 | case OBJECTS_ERROR: |
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50 | case OBJECTS_REMOTE: /* impossible */ |
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51 | break; |
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52 | case OBJECTS_LOCAL: |
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53 | the_thread_queue = the_thread->Wait.queue; |
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54 | |
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55 | /* |
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56 | * If the_thread_queue is not synchronized, then it is either |
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57 | * "nothing happened", "timeout", or "satisfied". If the_thread |
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58 | * is the executing thread, then it is in the process of blocking |
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59 | * and it is the thread which is responsible for the synchronization |
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60 | * process. |
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61 | * |
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62 | * If it is not satisfied, then it is "nothing happened" and |
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63 | * this is the "timeout" transition. After a request is satisfied, |
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64 | * a timeout is not allowed to occur. |
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65 | */ |
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66 | |
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67 | if ( the_thread_queue->sync_state != THREAD_QUEUE_SYNCHRONIZED && |
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68 | _Thread_Is_executing( the_thread ) ) { |
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69 | if ( the_thread_queue->sync_state != THREAD_QUEUE_SATISFIED ) |
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70 | the_thread_queue->sync_state = THREAD_QUEUE_TIMEOUT; |
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71 | } else { |
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72 | the_thread->Wait.return_code = the_thread->Wait.queue->timeout_status; |
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73 | _Thread_queue_Extract( the_thread->Wait.queue, the_thread ); |
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74 | } |
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75 | _Thread_Unnest_dispatch(); |
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76 | break; |
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77 | } |
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78 | } |
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79 | |
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