1 | /* |
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2 | * Rate Monotonic Manager |
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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/rtems/status.h> |
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17 | #include <rtems/rtems/support.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/rtems/ratemon.h> |
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21 | #include <rtems/score/thread.h> |
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22 | |
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23 | /*PAGE |
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24 | * |
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25 | * _Rate_monotonic_Timeout |
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26 | * |
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27 | * This routine processes a period ending. If the owning thread |
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28 | * is waiting for the period, that thread is unblocked and the |
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29 | * period reinitiated. Otherwise, the period is expired. |
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30 | * This routine is called by the watchdog handler. |
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31 | * |
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32 | * Input parameters: |
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33 | * id - period 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 _Rate_monotonic_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 | Rate_monotonic_Control *the_period; |
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44 | Objects_Locations location; |
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45 | Thread_Control *the_thread; |
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46 | |
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47 | the_period = _Rate_monotonic_Get( id, &location ); |
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48 | switch ( location ) { |
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49 | case OBJECTS_REMOTE: /* impossible */ |
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50 | case OBJECTS_ERROR: |
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51 | break; |
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52 | |
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53 | case OBJECTS_LOCAL: |
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54 | the_thread = the_period->owner; |
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55 | if ( _States_Is_waiting_for_period( the_thread->current_state ) && |
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56 | the_thread->Wait.id == the_period->Object.id ) { |
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57 | _Thread_Unblock( the_thread ); |
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58 | the_period->owner_ticks_executed_at_period = |
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59 | the_thread->ticks_executed; |
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60 | |
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61 | the_period->time_at_period = _Watchdog_Ticks_since_boot; |
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62 | |
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63 | _Watchdog_Reset( &the_period->Timer ); |
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64 | } else if ( the_period->state == RATE_MONOTONIC_OWNER_IS_BLOCKING ) { |
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65 | the_period->state = RATE_MONOTONIC_EXPIRED_WHILE_BLOCKING; |
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66 | the_period->owner_ticks_executed_at_period = |
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67 | the_thread->ticks_executed; |
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68 | |
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69 | the_period->time_at_period = _Watchdog_Ticks_since_boot; |
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70 | _Watchdog_Reset( &the_period->Timer ); |
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71 | } else |
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72 | the_period->state = RATE_MONOTONIC_EXPIRED; |
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73 | _Thread_Unnest_dispatch(); |
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74 | break; |
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75 | } |
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76 | } |
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