Subversion Repositories openrisc_me

/*
 *  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: threadclearstate.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_Clear_state
 *
 *  This kernel routine clears the appropriate states in the
 *  requested thread.  The thread ready chain is adjusted if
 *  necessary and the Heir thread is set accordingly.
 *
 *  Input parameters:
 *    the_thread - pointer to thread control block
 *    state      - state set to clear
 *
 *  Output parameters:  NONE
 *
 *  INTERRUPT LATENCY:
 *    priority map
 *    select heir
 */
 
 
void _Thread_Clear_state(
  Thread_Control *the_thread,
  States_Control  state
)
{
  ISR_Level       level;
  States_Control  current_state;
 
  _ISR_Disable( level );
    current_state = the_thread->current_state;
 
    if ( current_state & state ) {
      current_state = 
      the_thread->current_state = _States_Clear( state, current_state );
 
      if ( _States_Is_ready( current_state ) ) {
 
        _Priority_Add_to_bit_map( &the_thread->Priority_map );
 
        _Chain_Append_unprotected(the_thread->ready, &the_thread->Object.Node);
 
        _ISR_Flash( level );
 
        if ( the_thread->current_priority < _Thread_Heir->current_priority ) {
          _Thread_Heir = the_thread;
          if ( _Thread_Executing->is_preemptible ||
               the_thread->current_priority == 0 )
            _Context_Switch_necessary = TRUE;
        }
      }
  }
  _ISR_Enable( level );
}