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/*
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* RTEMS Task Manager
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*
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*
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* COPYRIGHT (c) 1989-1999.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.OARcorp.com/rtems/license.html.
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*
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* $Id: tasksetpriority.c,v 1.2 2001-09-27 11:59:19 chris Exp $
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158 |
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*/
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#include <rtems/system.h>
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#include <rtems/rtems/status.h>
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#include <rtems/rtems/support.h>
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#include <rtems/rtems/modes.h>
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#include <rtems/score/object.h>
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#include <rtems/score/stack.h>
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#include <rtems/score/states.h>
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#include <rtems/rtems/tasks.h>
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#include <rtems/score/thread.h>
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#include <rtems/score/threadq.h>
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#include <rtems/score/tod.h>
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#include <rtems/score/userext.h>
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#include <rtems/score/wkspace.h>
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#include <rtems/score/apiext.h>
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#include <rtems/score/sysstate.h>
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/*PAGE
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*
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* rtems_task_set_priority
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*
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* This directive changes the priority of the specified thread.
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* The specified thread can be any thread in the system including
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* the requesting thread.
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*
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* Input parameters:
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* id - thread id (0 indicates requesting thread)
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* new_priority - thread priority (0 indicates current priority)
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* old_priority - pointer to previous priority
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*
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* Output parameters:
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* old_priority - previous priority
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* RTEMS_SUCCESSFUL - if successful
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* error code - if unsuccessful
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*/
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rtems_status_code rtems_task_set_priority(
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Objects_Id id,
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rtems_task_priority new_priority,
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rtems_task_priority *old_priority
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)
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{
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register Thread_Control *the_thread;
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Objects_Locations location;
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if ( new_priority != RTEMS_CURRENT_PRIORITY &&
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!_RTEMS_tasks_Priority_is_valid( new_priority ) )
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return RTEMS_INVALID_PRIORITY;
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if ( !old_priority )
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return RTEMS_INVALID_ADDRESS;
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the_thread = _Thread_Get( id, &location );
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switch ( location ) {
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case OBJECTS_REMOTE:
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#if defined(RTEMS_MULTIPROCESSING)
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_Thread_Executing->Wait.return_argument = old_priority;
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return _RTEMS_tasks_MP_Send_request_packet(
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RTEMS_TASKS_MP_SET_PRIORITY_REQUEST,
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id,
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new_priority,
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0, /* Not used */
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);
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#endif
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case OBJECTS_ERROR:
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return RTEMS_INVALID_ID;
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case OBJECTS_LOCAL:
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/* XXX convert from core priority */
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*old_priority = the_thread->current_priority;
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if ( new_priority != RTEMS_CURRENT_PRIORITY ) {
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the_thread->real_priority = new_priority;
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if ( the_thread->resource_count == 0 ||
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the_thread->current_priority > new_priority )
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_Thread_Change_priority( the_thread, new_priority, FALSE );
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}
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_Thread_Enable_dispatch();
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return RTEMS_SUCCESSFUL;
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}
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return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */
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}
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