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/*

 *  RTEMS Task Manager

 *

 *

 *  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: taskmode.c,v 1.2 2001-09-27 11:59:19 chris Exp $

 */

#include <rtems/system.h>

#include <rtems/rtems/status.h>

#include <rtems/rtems/support.h>

#include <rtems/rtems/modes.h>

#include <rtems/score/object.h>

#include <rtems/score/stack.h>

#include <rtems/score/states.h>

#include <rtems/rtems/tasks.h>

#include <rtems/score/thread.h>

#include <rtems/score/threadq.h>

#include <rtems/score/tod.h>

#include <rtems/score/userext.h>

#include <rtems/score/wkspace.h>

#include <rtems/score/apiext.h>

#include <rtems/score/sysstate.h>

/*PAGE

 *

 *  rtems_task_mode

 *

 *  This directive enables and disables several modes of

 *  execution for the requesting thread.

 *

 *  Input parameters:

 *    mode_set          - new mode

 *    mask              - mask

 *    previous_mode_set - address of previous mode set

 *

 *  Output:

 *    *previous_mode_set - previous mode set

 *     always return RTEMS_SUCCESSFUL;

 */

rtems_status_code rtems_task_mode(

  rtems_mode  mode_set,

  rtems_mode  mask,

  rtems_mode *previous_mode_set

)

{

  Thread_Control     *executing;

  RTEMS_API_Control  *api;

  ASR_Information    *asr;

  boolean             is_asr_enabled = FALSE;

  boolean             needs_asr_dispatching = FALSE;

  rtems_mode          old_mode;

  executing     = _Thread_Executing;

  api = executing->API_Extensions[ THREAD_API_RTEMS ];

  asr = &api->Signal;

  old_mode  = (executing->is_preemptible) ? RTEMS_PREEMPT : RTEMS_NO_PREEMPT;

  if ( executing->budget_algorithm == THREAD_CPU_BUDGET_ALGORITHM_NONE )

    old_mode |= RTEMS_NO_TIMESLICE;

  else

    old_mode |= RTEMS_TIMESLICE;

  old_mode |= (asr->is_enabled) ? RTEMS_ASR : RTEMS_NO_ASR;

  old_mode |= _ISR_Get_level();

  *previous_mode_set = old_mode;

  /*

   *  These are generic thread scheduling characteristics.

   */

  if ( mask & RTEMS_PREEMPT_MASK )

    executing->is_preemptible = _Modes_Is_preempt(mode_set) ? TRUE : FALSE;

  if ( mask & RTEMS_TIMESLICE_MASK ) {

    if ( _Modes_Is_timeslice(mode_set) )

      executing->budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_RESET_TIMESLICE;

    else

      executing->budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_NONE;

  }

  /*

   *  Set the new interrupt level

   */

  if ( mask & RTEMS_INTERRUPT_MASK )

    _Modes_Set_interrupt_level( mode_set );

  /*

   *  This is specific to the RTEMS API

   */

  is_asr_enabled = FALSE;

  needs_asr_dispatching = FALSE;

  if ( mask & RTEMS_ASR_MASK ) {

    is_asr_enabled = _Modes_Is_asr_disabled( mode_set ) ? FALSE : TRUE;

    if ( is_asr_enabled != asr->is_enabled ) {

      asr->is_enabled = is_asr_enabled;

      _ASR_Swap_signals( asr );

      if ( _ASR_Are_signals_pending( asr ) ) {

        needs_asr_dispatching = TRUE;

        executing->do_post_task_switch_extension = TRUE;

      }

    }

  }

  if ( _Thread_Evaluate_mode() || needs_asr_dispatching )

    _Thread_Dispatch();

  return RTEMS_SUCCESSFUL;

}