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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.

 *

 *  threadresume.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_Resume

 *

 *  This kernel routine clears the SUSPEND state if the suspend_count

 *  drops below one.  If the force parameter is set the suspend_count

 *  is forced back to zero. The thread ready chain is adjusted if

 *  necessary and the Heir thread is set accordingly.

 *

 *  Input parameters:

 *    the_thread - pointer to thread control block

 *    force      - force the suspend count back to 0

 *

 *  Output parameters:  NONE

 *

 *  INTERRUPT LATENCY:

 *    priority map

 *    select heir

 */

void _Thread_Resume(

  Thread_Control   *the_thread,

  boolean           force

)

{

  ISR_Level       level;

  States_Control  current_state;

  _ISR_Disable( level );

  if ( force == TRUE )

    the_thread->suspend_count = 0;

  else

    the_thread->suspend_count--;

  if ( the_thread->suspend_count > 0 ) {

    _ISR_Enable( level );

    return;

  }

  current_state = the_thread->current_state;

  if ( current_state & STATES_SUSPENDED ) {

    current_state =

    the_thread->current_state = _States_Clear(STATES_SUSPENDED, 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 );

}