1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Get a per-task variable |
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5 | * @ingroup ClassicTasks Tasks |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2007. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.com/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <rtems/system.h> |
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22 | #include <rtems/rtems/tasks.h> |
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23 | #include <rtems/score/wkspace.h> |
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24 | |
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25 | /* |
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26 | * rtems_task_variable_get |
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27 | * |
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28 | * This directive gets the value of a task variable. |
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29 | */ |
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30 | |
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31 | rtems_status_code rtems_task_variable_get( |
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32 | rtems_id tid, |
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33 | void **ptr, |
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34 | void **result |
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35 | ) |
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36 | { |
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37 | Thread_Control *the_thread; |
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38 | Objects_Locations location; |
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39 | rtems_task_variable_t *tvp; |
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40 | |
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41 | if ( !ptr ) |
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42 | return RTEMS_INVALID_ADDRESS; |
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43 | |
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44 | if ( !result ) |
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45 | return RTEMS_INVALID_ADDRESS; |
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46 | |
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47 | the_thread = _Thread_Get (tid, &location); |
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48 | switch (location) { |
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49 | |
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50 | case OBJECTS_LOCAL: |
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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 | tvp = the_thread->task_variables; |
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55 | while (tvp) { |
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56 | if (tvp->ptr == ptr) { |
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57 | /* |
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58 | * Should this return the current (i.e not the |
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59 | * saved) value if `tid' is the current task? |
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60 | */ |
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61 | *result = tvp->tval; |
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62 | _Objects_Put( &the_thread->Object ); |
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63 | return RTEMS_SUCCESSFUL; |
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64 | } |
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65 | tvp = (rtems_task_variable_t *)tvp->next; |
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66 | } |
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67 | _Objects_Put( &the_thread->Object ); |
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68 | return RTEMS_INVALID_ADDRESS; |
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69 | |
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70 | #if defined(RTEMS_MULTIPROCESSING) |
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71 | case OBJECTS_REMOTE: |
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72 | _Thread_Dispatch(); |
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73 | return RTEMS_ILLEGAL_ON_REMOTE_OBJECT; |
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74 | #endif |
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75 | |
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76 | case OBJECTS_ERROR: |
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77 | break; |
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78 | } |
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79 | return RTEMS_INVALID_ID; |
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80 | } |
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