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/*

 *  Event Manager

 *

 *  COPYRIGHT (c) 1989-1999.

 *  On-Line Applications Research Corporation (OAR).

 *

 *  The license and distribution terms for this file may be

 *  found in the file LICENSE in this distribution or at

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

 *

 *  $Id: eventsurrender.c,v 1.2 2001-09-27 11:59:19 chris Exp $

 */

#include <rtems/system.h>

#include <rtems/rtems/status.h>

#include <rtems/rtems/event.h>

#include <rtems/score/isr.h>

#include <rtems/score/object.h>

#include <rtems/rtems/options.h>

#include <rtems/score/states.h>

#include <rtems/score/thread.h>

#include <rtems/rtems/tasks.h>

/*PAGE

 *

 *  _Event_Surrender

 *

 *  This routines remove a thread from the specified threadq.

 *

 *  Input parameters:

 *    the_thread - pointer to thread to be dequeued

 *

 *  Output parameters: NONE

 *

 *  INTERRUPT LATENCY:

 *    before flash

 *    after flash

 *    check sync

 */

void _Event_Surrender(

  Thread_Control *the_thread

)

{

  ISR_Level           level;

  rtems_event_set     pending_events;

  rtems_event_set     event_condition;

  rtems_event_set     seized_events;

  rtems_option        option_set;

  RTEMS_API_Control  *api;

  api = the_thread->API_Extensions[ THREAD_API_RTEMS ];

  option_set = (rtems_option) the_thread->Wait.option;

  _ISR_Disable( level );

  pending_events  = api->pending_events;

  event_condition = (rtems_event_set) the_thread->Wait.count;

  seized_events = _Event_sets_Get( pending_events, event_condition );

  if ( !_Event_sets_Is_empty( seized_events ) ) {

    if ( _States_Is_waiting_for_event( the_thread->current_state ) ) {

      if ( seized_events == event_condition || _Options_Is_any( option_set ) ) {

        api->pending_events =

           _Event_sets_Clear( pending_events, seized_events );

        *(rtems_event_set *)the_thread->Wait.return_argument = seized_events;

        _ISR_Flash( level );

        if ( !_Watchdog_Is_active( &the_thread->Timer ) ) {

          _ISR_Enable( level );

          _Thread_Unblock( the_thread );

        }

        else {

          _Watchdog_Deactivate( &the_thread->Timer );

          _ISR_Enable( level );

          (void) _Watchdog_Remove( &the_thread->Timer );

          _Thread_Unblock( the_thread );

        }

        return;

      }

    }

    switch ( _Event_Sync_state ) {

      case EVENT_SYNC_SYNCHRONIZED:

      case EVENT_SYNC_SATISFIED:

        break;

      case EVENT_SYNC_NOTHING_HAPPENED:

      case EVENT_SYNC_TIMEOUT:

        if ( !_Thread_Is_executing( the_thread ) )

          break;

        if ( seized_events == event_condition || _Options_Is_any(option_set) ) {

          api->pending_events =

               _Event_sets_Clear( pending_events,seized_events );

          *(rtems_event_set *)the_thread->Wait.return_argument = seized_events;

          _Event_Sync_state = EVENT_SYNC_SATISFIED;

        }

        break;

    }

  }

  _ISR_Enable( level );

}