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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.
 *
 *  threadready.c,v 1.2 1999/11/17 17:50:42 joel 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 );
}