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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: threadready.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_Ready

 *

 *  This kernel routine readies the requested thread, the thread chain

 *  is adjusted.  A new heir thread may be selected.

 *

 *  Input parameters:

 *    the_thread - pointer to thread control block

 *

 *  Output parameters:  NONE

 *

 *  NOTE:  This routine uses the "blocking" heir selection mechanism.

 *         This insures the correct heir after a thread restart.

 *

 *  INTERRUPT LATENCY:

 *    ready chain

 *    select heir

 */

void _Thread_Ready(

  Thread_Control *the_thread

)

{

  ISR_Level              level;

  Thread_Control *heir;

  _ISR_Disable( level );

  the_thread->current_state = STATES_READY;

  _Priority_Add_to_bit_map( &the_thread->Priority_map );

  _Chain_Append_unprotected( the_thread->ready, &the_thread->Object.Node );

  _ISR_Flash( level );

  _Thread_Calculate_heir();

  heir = _Thread_Heir;

  if ( !_Thread_Is_executing( heir ) && _Thread_Executing->is_preemptible )

    _Context_Switch_necessary = TRUE;

  _ISR_Enable( level );

}