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.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_Enqueue_fifo |
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31 | * |
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32 | * This routine blocks a thread, places it on a thread, and optionally |
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33 | * starts a timeout timer. |
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34 | * |
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35 | * Input parameters: |
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36 | * the_thread_queue - pointer to threadq |
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37 | * the_thread - pointer to the thread to block |
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38 | * timeout - interval to wait |
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39 | * |
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40 | * Output parameters: NONE |
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41 | * |
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42 | * INTERRUPT LATENCY: |
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43 | * only case |
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44 | */ |
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45 | |
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46 | void _Thread_queue_Enqueue_fifo ( |
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47 | Thread_queue_Control *the_thread_queue, |
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48 | Thread_Control *the_thread, |
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49 | Watchdog_Interval timeout |
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50 | ) |
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51 | { |
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52 | ISR_Level level; |
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53 | Thread_queue_States sync_state; |
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54 | |
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55 | _ISR_Disable( level ); |
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56 | |
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57 | sync_state = the_thread_queue->sync_state; |
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58 | the_thread_queue->sync_state = THREAD_QUEUE_SYNCHRONIZED; |
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59 | |
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60 | switch ( sync_state ) { |
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61 | case THREAD_QUEUE_SYNCHRONIZED: |
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62 | /* |
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63 | * This should never happen. It indicates that someone did not |
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64 | * enter a thread queue critical section. |
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65 | */ |
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66 | break; |
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67 | |
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68 | case THREAD_QUEUE_NOTHING_HAPPENED: |
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69 | _Chain_Append_unprotected( |
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70 | &the_thread_queue->Queues.Fifo, |
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71 | &the_thread->Object.Node |
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72 | ); |
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73 | _ISR_Enable( level ); |
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74 | return; |
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75 | |
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76 | case THREAD_QUEUE_TIMEOUT: |
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77 | the_thread->Wait.return_code = the_thread->Wait.queue->timeout_status; |
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78 | _ISR_Enable( level ); |
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79 | break; |
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80 | |
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81 | case THREAD_QUEUE_SATISFIED: |
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82 | if ( _Watchdog_Is_active( &the_thread->Timer ) ) { |
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83 | _Watchdog_Deactivate( &the_thread->Timer ); |
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84 | _ISR_Enable( level ); |
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85 | (void) _Watchdog_Remove( &the_thread->Timer ); |
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86 | } else |
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87 | _ISR_Enable( level ); |
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88 | break; |
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89 | } |
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90 | |
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91 | /* |
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92 | * Global objects with thread queue's should not be operated on from an |
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93 | * ISR. But the sync code still must allow short timeouts to be processed |
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94 | * correctly. |
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95 | */ |
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96 | |
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97 | _Thread_Unblock( the_thread ); |
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98 | |
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99 | #if defined(RTEMS_MULTIPROCESSING) |
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100 | if ( !_Objects_Is_local_id( the_thread->Object.id ) ) |
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101 | _Thread_MP_Free_proxy( the_thread ); |
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102 | #endif |
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103 | |
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104 | } |
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