1 | /* |
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2 | * rtems_task_variable_get - Get a per-task variable |
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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/tasks.h> |
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17 | #include <rtems/score/wkspace.h> |
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18 | |
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19 | /* |
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20 | * rtems_task_variable_get |
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21 | * |
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22 | * This directive gets the value of a task variable. |
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23 | */ |
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24 | |
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25 | rtems_status_code rtems_task_variable_get( |
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26 | rtems_id tid, |
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27 | void **ptr, |
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28 | void **result |
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29 | ) |
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30 | { |
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31 | Thread_Control *the_thread; |
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32 | Objects_Locations location; |
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33 | rtems_task_variable_t *tvp; |
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34 | |
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35 | the_thread = _Thread_Get (tid, &location); |
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36 | switch (location) { |
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37 | case OBJECTS_REMOTE: |
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38 | #if defined(RTEMS_MULTIPROCESSING) |
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39 | _Thread_Dispatch(); |
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40 | return RTEMS_ILLEGAL_ON_REMOTE_OBJECT; |
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41 | #endif |
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42 | |
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43 | case OBJECTS_ERROR: |
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44 | return RTEMS_INVALID_ID; |
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45 | |
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46 | default: |
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47 | return RTEMS_INTERNAL_ERROR; |
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48 | |
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49 | case OBJECTS_LOCAL: |
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50 | |
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51 | /* |
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52 | * Figure out if the variable is in this task's list. |
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53 | */ |
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54 | |
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55 | tvp = the_thread->task_variables; |
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56 | while (tvp) { |
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57 | if (tvp->ptr == ptr) { |
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58 | /* |
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59 | * Should this return the current (i.e not the |
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60 | * saved) value if `tid' is the current task? |
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61 | */ |
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62 | *result = tvp->tval; |
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63 | _Thread_Enable_dispatch(); |
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64 | return RTEMS_SUCCESSFUL; |
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65 | } |
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66 | tvp = tvp->next; |
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67 | } |
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68 | _Thread_Enable_dispatch(); |
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69 | return RTEMS_INVALID_ADDRESS; |
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70 | } |
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71 | return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */ |
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72 | } |
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