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/*

 *  COPYRIGHT (c) 1989-1999.

 *  On-Line Applications Research Corporation (OAR).

 *

 *  The license and distribution terms for this file may be

 *  found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 *

 *  $Id: chg_pri.c,v 1.2 2001-09-27 11:59:13 chris Exp $

 */

#include <itron.h>

#include <rtems/score/thread.h>

#include <rtems/score/userext.h>

#include <rtems/score/wkspace.h>

#include <rtems/score/apiext.h>

#include <rtems/score/sysstate.h>

#include <rtems/itron/task.h>

/*

 *  chg_pri - Change Task Priority

 */

ER chg_pri(

  ID  tskid,

  PRI tskpri

)

{

  register Thread_Control *the_thread;

  Objects_Locations        location;

  Priority_Control         new_priority;

  the_thread = _ITRON_Task_Get( tskid, &location );

  switch ( location ) {

    case OBJECTS_REMOTE:

    case OBJECTS_ERROR:

      return _ITRON_Task_Clarify_get_id_error( tskid );

    case OBJECTS_LOCAL:

      if (_States_Is_dormant( the_thread->current_state ))

        _ITRON_return_errorno( E_OBJ );

      if (( tskpri <= 0 ) || ( tskpri >= 256 ))

        _ITRON_return_errorno( E_PAR );

      new_priority = _ITRON_Task_Priority_to_Core( tskpri );

      the_thread->real_priority = new_priority;

      /*

       * The priority should not be changed until later if priority

       * inheratance has occured.

       */

      if ( the_thread->resource_count == 0 ||

           the_thread->current_priority > new_priority )

        _Thread_Change_priority( the_thread, new_priority, FALSE );

      break;

  }

  _ITRON_return_errorno( E_OK );

}