[c4d69e2] | 1 | /* |
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| 2 | * RTEMS Task Manager |
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| 3 | * |
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| 4 | * |
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| 5 | * COPYRIGHT (c) 1989-1998. |
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| 6 | * On-Line Applications Research Corporation (OAR). |
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| 7 | * Copyright assigned to U.S. Government, 1994. |
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| 8 | * |
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| 9 | * The license and distribution terms for this file may be |
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| 10 | * found in the file LICENSE in this distribution or at |
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| 11 | * http://www.OARcorp.com/rtems/license.html. |
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| 12 | * |
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| 13 | * $Id$ |
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| 14 | */ |
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| 15 | |
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| 16 | #include <rtems/system.h> |
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| 17 | #include <rtems/rtems/status.h> |
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| 18 | #include <rtems/rtems/support.h> |
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| 19 | #include <rtems/rtems/modes.h> |
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| 20 | #include <rtems/score/object.h> |
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| 21 | #include <rtems/score/stack.h> |
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| 22 | #include <rtems/score/states.h> |
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| 23 | #include <rtems/rtems/tasks.h> |
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| 24 | #include <rtems/score/thread.h> |
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| 25 | #include <rtems/score/threadq.h> |
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| 26 | #include <rtems/score/tod.h> |
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| 27 | #include <rtems/score/userext.h> |
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| 28 | #include <rtems/score/wkspace.h> |
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| 29 | #include <rtems/score/apiext.h> |
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| 30 | #include <rtems/score/sysstate.h> |
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| 31 | |
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| 32 | /*PAGE |
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| 33 | * |
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| 34 | * rtems_task_set_priority |
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| 35 | * |
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| 36 | * This directive changes the priority of the specified thread. |
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| 37 | * The specified thread can be any thread in the system including |
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| 38 | * the requesting thread. |
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| 39 | * |
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| 40 | * Input parameters: |
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| 41 | * id - thread id (0 indicates requesting thread) |
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| 42 | * new_priority - thread priority (0 indicates current priority) |
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| 43 | * old_priority - pointer to previous priority |
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| 44 | * |
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| 45 | * Output parameters: |
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| 46 | * old_priority - previous priority |
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| 47 | * RTEMS_SUCCESSFUL - if successful |
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| 48 | * error code - if unsuccessful |
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| 49 | */ |
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| 50 | |
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| 51 | rtems_status_code rtems_task_set_priority( |
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| 52 | Objects_Id id, |
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| 53 | rtems_task_priority new_priority, |
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| 54 | rtems_task_priority *old_priority |
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| 55 | ) |
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| 56 | { |
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| 57 | register Thread_Control *the_thread; |
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| 58 | Objects_Locations location; |
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| 59 | |
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| 60 | if ( new_priority != RTEMS_CURRENT_PRIORITY && |
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| 61 | !_RTEMS_tasks_Priority_is_valid( new_priority ) ) |
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| 62 | return RTEMS_INVALID_PRIORITY; |
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| 63 | |
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[0860426] | 64 | if ( !old_priority ) |
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| 65 | return RTEMS_INVALID_ADDRESS; |
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| 66 | |
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[c4d69e2] | 67 | the_thread = _Thread_Get( id, &location ); |
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| 68 | switch ( location ) { |
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| 69 | |
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| 70 | case OBJECTS_REMOTE: |
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| 71 | #if defined(RTEMS_MULTIPROCESSING) |
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| 72 | _Thread_Executing->Wait.return_argument = old_priority; |
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| 73 | return _RTEMS_tasks_MP_Send_request_packet( |
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| 74 | RTEMS_TASKS_MP_SET_PRIORITY_REQUEST, |
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| 75 | id, |
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| 76 | new_priority, |
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| 77 | 0, /* Not used */ |
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| 78 | 0 /* Not used */ |
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| 79 | ); |
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| 80 | #endif |
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| 81 | |
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| 82 | case OBJECTS_ERROR: |
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| 83 | return RTEMS_INVALID_ID; |
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| 84 | |
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| 85 | case OBJECTS_LOCAL: |
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| 86 | *old_priority = the_thread->current_priority; |
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| 87 | if ( new_priority != RTEMS_CURRENT_PRIORITY ) { |
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| 88 | the_thread->real_priority = new_priority; |
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| 89 | if ( the_thread->resource_count == 0 || |
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| 90 | the_thread->current_priority > new_priority ) |
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| 91 | _Thread_Change_priority( the_thread, new_priority, FALSE ); |
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| 92 | } |
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| 93 | _Thread_Enable_dispatch(); |
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| 94 | return RTEMS_SUCCESSFUL; |
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| 95 | } |
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| 96 | |
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| 97 | return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */ |
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| 98 | } |
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