1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief RTEMS Set Task Priority |
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5 | * @ingroup ClassicTasks |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2014. |
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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.org/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/rtems/tasksimpl.h> |
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22 | #include <rtems/score/threadimpl.h> |
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23 | |
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24 | rtems_status_code rtems_task_set_priority( |
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25 | rtems_id id, |
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26 | rtems_task_priority new_priority, |
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27 | rtems_task_priority *old_priority |
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28 | ) |
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29 | { |
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30 | Thread_Control *the_thread; |
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31 | ISR_lock_Context lock_context; |
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32 | Per_CPU_Control *cpu_self; |
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33 | |
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34 | if ( new_priority != RTEMS_CURRENT_PRIORITY && |
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35 | !_RTEMS_tasks_Priority_is_valid( new_priority ) ) |
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36 | return RTEMS_INVALID_PRIORITY; |
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37 | |
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38 | if ( !old_priority ) |
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39 | return RTEMS_INVALID_ADDRESS; |
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40 | |
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41 | the_thread = _Thread_Get_interrupt_disable( id, &lock_context ); |
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42 | |
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43 | if ( the_thread == NULL ) { |
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44 | #if defined(RTEMS_MULTIPROCESSING) |
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45 | return _RTEMS_tasks_MP_Set_priority( id, new_priority, old_priority ); |
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46 | #else |
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47 | return RTEMS_INVALID_ID; |
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48 | #endif |
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49 | } |
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50 | |
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51 | cpu_self = _Thread_Dispatch_disable_critical( &lock_context ); |
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52 | _ISR_lock_ISR_enable( &lock_context ); |
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53 | |
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54 | if ( new_priority != RTEMS_CURRENT_PRIORITY ) { |
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55 | _Thread_Set_priority( |
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56 | the_thread, |
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57 | _RTEMS_tasks_Priority_to_Core( new_priority ), |
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58 | old_priority, |
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59 | false |
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60 | ); |
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61 | *old_priority = _RTEMS_tasks_Priority_from_Core( *old_priority ); |
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62 | } else { |
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63 | *old_priority = _RTEMS_tasks_Priority_from_Core( |
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64 | the_thread->current_priority |
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65 | ); |
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66 | } |
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67 | |
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68 | _Thread_Dispatch_enable( cpu_self ); |
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69 | return RTEMS_SUCCESSFUL; |
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70 | } |
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