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[/] [or1k/] [trunk/] [rtems/] [c/] [src/] [exec/] [rtems/] [src/] [taskmode.c] - Blame information for rev 1765

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1 158 chris
/*
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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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 *
12 208 chris
 *  $Id: taskmode.c,v 1.2 2001-09-27 11:59:19 chris Exp $
13 158 chris
 */
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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_mode
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 *
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 *  This directive enables and disables several modes of
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 *  execution for the requesting thread.
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 *
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 *  Input parameters:
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 *    mode_set          - new mode
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 *    mask              - mask
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 *    previous_mode_set - address of previous mode set
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 *
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 *  Output:
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 *    *previous_mode_set - previous mode set
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 *     always return RTEMS_SUCCESSFUL;
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 */
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rtems_status_code rtems_task_mode(
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  rtems_mode  mode_set,
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  rtems_mode  mask,
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  rtems_mode *previous_mode_set
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)
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{
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  Thread_Control     *executing;
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  RTEMS_API_Control  *api;
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  ASR_Information    *asr;
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  boolean             is_asr_enabled = FALSE;
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  boolean             needs_asr_dispatching = FALSE;
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  rtems_mode          old_mode;
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  executing     = _Thread_Executing;
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  api = executing->API_Extensions[ THREAD_API_RTEMS ];
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  asr = &api->Signal;
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  old_mode  = (executing->is_preemptible) ? RTEMS_PREEMPT : RTEMS_NO_PREEMPT;
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  if ( executing->budget_algorithm == THREAD_CPU_BUDGET_ALGORITHM_NONE )
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    old_mode |= RTEMS_NO_TIMESLICE;
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  else
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    old_mode |= RTEMS_TIMESLICE;
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  old_mode |= (asr->is_enabled) ? RTEMS_ASR : RTEMS_NO_ASR;
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  old_mode |= _ISR_Get_level();
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  *previous_mode_set = old_mode;
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  /*
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   *  These are generic thread scheduling characteristics.
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   */
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  if ( mask & RTEMS_PREEMPT_MASK )
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    executing->is_preemptible = _Modes_Is_preempt(mode_set) ? TRUE : FALSE;
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  if ( mask & RTEMS_TIMESLICE_MASK ) {
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    if ( _Modes_Is_timeslice(mode_set) )
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      executing->budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_RESET_TIMESLICE;
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    else
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      executing->budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_NONE;
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  }
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  /*
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   *  Set the new interrupt level
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   */
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  if ( mask & RTEMS_INTERRUPT_MASK )
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    _Modes_Set_interrupt_level( mode_set );
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  /*
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   *  This is specific to the RTEMS API
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   */
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  is_asr_enabled = FALSE;
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  needs_asr_dispatching = FALSE;
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  if ( mask & RTEMS_ASR_MASK ) {
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    is_asr_enabled = _Modes_Is_asr_disabled( mode_set ) ? FALSE : TRUE;
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    if ( is_asr_enabled != asr->is_enabled ) {
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      asr->is_enabled = is_asr_enabled;
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      _ASR_Swap_signals( asr );
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      if ( _ASR_Are_signals_pending( asr ) ) {
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        needs_asr_dispatching = TRUE;
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        executing->do_post_task_switch_extension = TRUE;
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      }
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    }
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  }
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  if ( _Thread_Evaluate_mode() || needs_asr_dispatching )
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    _Thread_Dispatch();
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  return RTEMS_SUCCESSFUL;
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}

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