1 | /* |
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2 | * COPYRIGHT (c) 1989-1999. |
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3 | * On-Line Applications Research Corporation (OAR). |
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4 | * |
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5 | * The license and distribution terms for this file may be |
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6 | * found in the file LICENSE in this distribution or at |
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7 | * http://www.OARcorp.com/rtems/license.html. |
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8 | * |
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9 | * $Id$ |
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10 | */ |
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11 | |
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12 | #include <itron.h> |
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13 | |
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14 | #include <rtems/itron/semaphore.h> |
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15 | #include <rtems/itron/task.h> |
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16 | #include <rtems/score/tod.h> |
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17 | |
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18 | /* |
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19 | * twai_sem - Wait on Semaphore with Timeout |
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20 | * |
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21 | * This function implements the ITRON 3.0 twai_sem() service. |
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22 | */ |
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23 | |
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24 | ER twai_sem( |
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25 | ID semid, |
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26 | TMO tmout |
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27 | ) |
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28 | { |
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29 | ITRON_Semaphore_Control *the_semaphore; |
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30 | Objects_Locations location; |
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31 | Watchdog_Interval interval; |
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32 | boolean wait; |
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33 | CORE_semaphore_Status status; |
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34 | |
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35 | interval = 0; |
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36 | if ( tmout == TMO_POL ) { |
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37 | wait = FALSE; |
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38 | } else { |
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39 | wait = TRUE; |
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40 | if ( tmout != TMO_FEVR ) |
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41 | interval = TOD_MILLISECONDS_TO_TICKS(tmout); |
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42 | } |
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43 | |
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44 | if ( wait && _ITRON_Is_in_non_task_state() ) |
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45 | return E_CTX; |
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46 | |
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47 | the_semaphore = _ITRON_Semaphore_Get( semid, &location ); |
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48 | switch ( location ) { |
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49 | case OBJECTS_REMOTE: /* Multiprocessing not supported */ |
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50 | case OBJECTS_ERROR: |
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51 | return _ITRON_Semaphore_Clarify_get_id_error( semid ); |
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52 | |
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53 | case OBJECTS_LOCAL: |
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54 | _CORE_semaphore_Seize( |
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55 | &the_semaphore->semaphore, |
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56 | the_semaphore->Object.id, |
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57 | wait, /* wait for a timeout */ |
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58 | interval /* timeout value */ |
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59 | ); |
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60 | _Thread_Enable_dispatch(); |
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61 | status = (CORE_semaphore_Status) _Thread_Executing->Wait.return_code; |
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62 | return _ITRON_Semaphore_Translate_core_semaphore_return_code( status ); |
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63 | } |
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64 | return E_OK; |
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65 | } |
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