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/*

 *  Thread Handler

 *

 *

 *  COPYRIGHT (c) 1989-1999.

 *  On-Line Applications Research Corporation (OAR).

 *

 *  The license and distribution terms for this file may be

 *  found in found in the file LICENSE in this distribution or at

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

 *

 *  $Id: threadsettransient.c,v 1.2 2001-09-27 11:59:34 chris Exp $

 */

#include <rtems/system.h>

#include <rtems/score/apiext.h>

#include <rtems/score/context.h>

#include <rtems/score/interr.h>

#include <rtems/score/isr.h>

#include <rtems/score/object.h>

#include <rtems/score/priority.h>

#include <rtems/score/states.h>

#include <rtems/score/sysstate.h>

#include <rtems/score/thread.h>

#include <rtems/score/threadq.h>

#include <rtems/score/userext.h>

#include <rtems/score/wkspace.h>

/*PAGE

 *

 *  _Thread_Set_transient

 *

 *  This kernel routine places the requested thread in the transient state

 *  which will remove it from the ready queue, if necessary.  No

 *  rescheduling is necessary because it is assumed that the transient

 *  state will be cleared before dispatching is enabled.

 *

 *  Input parameters:

 *    the_thread - pointer to thread control block

 *

 *  Output parameters:  NONE

 *

 *  INTERRUPT LATENCY:

 *    only case

 */

void _Thread_Set_transient(

  Thread_Control *the_thread

)

{

  ISR_Level             level;

  unsigned32            old_state;

  Chain_Control *ready;

  ready = the_thread->ready;

  _ISR_Disable( level );

  old_state = the_thread->current_state;

  the_thread->current_state = _States_Set( STATES_TRANSIENT, old_state );

  if ( _States_Is_ready( old_state ) ) {

    if ( _Chain_Has_only_one_node( ready ) ) {

      _Chain_Initialize_empty( ready );

      _Priority_Remove_from_bit_map( &the_thread->Priority_map );

    } else

      _Chain_Extract_unprotected( &the_thread->Object.Node );

  }

  _ISR_Enable( level );

}