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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [rtems/] [src/] [eventsurrender.c] - Blame information for rev 173

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1 30 unneback
/*
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 *  Event Manager
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 *
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 *  COPYRIGHT (c) 1989-1999.
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 *  On-Line Applications Research Corporation (OAR).
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 *
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 *  The license and distribution terms for this file may be
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 *  found in the file LICENSE in this distribution or at
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 *  http://www.OARcorp.com/rtems/license.html.
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 *
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 *  $Id: eventsurrender.c,v 1.2 2001-09-27 11:59:19 chris Exp $
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 */
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#include <rtems/system.h>
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#include <rtems/rtems/status.h>
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#include <rtems/rtems/event.h>
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#include <rtems/score/isr.h>
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#include <rtems/score/object.h>
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#include <rtems/rtems/options.h>
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#include <rtems/score/states.h>
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#include <rtems/score/thread.h>
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#include <rtems/rtems/tasks.h>
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/*PAGE
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 *
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 *  _Event_Surrender
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 *
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 *  This routines remove a thread from the specified threadq.
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 *
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 *  Input parameters:
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 *    the_thread - pointer to thread to be dequeued
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 *
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 *  Output parameters: NONE
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 *
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 *  INTERRUPT LATENCY:
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 *    before flash
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 *    after flash
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 *    check sync
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 */
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void _Event_Surrender(
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  Thread_Control *the_thread
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)
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{
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  ISR_Level           level;
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  rtems_event_set     pending_events;
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  rtems_event_set     event_condition;
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  rtems_event_set     seized_events;
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  rtems_option        option_set;
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  RTEMS_API_Control  *api;
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  api = the_thread->API_Extensions[ THREAD_API_RTEMS ];
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  option_set = (rtems_option) the_thread->Wait.option;
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  _ISR_Disable( level );
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  pending_events  = api->pending_events;
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  event_condition = (rtems_event_set) the_thread->Wait.count;
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  seized_events = _Event_sets_Get( pending_events, event_condition );
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  if ( !_Event_sets_Is_empty( seized_events ) ) {
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    if ( _States_Is_waiting_for_event( the_thread->current_state ) ) {
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      if ( seized_events == event_condition || _Options_Is_any( option_set ) ) {
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        api->pending_events =
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           _Event_sets_Clear( pending_events, seized_events );
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        *(rtems_event_set *)the_thread->Wait.return_argument = seized_events;
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        _ISR_Flash( level );
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        if ( !_Watchdog_Is_active( &the_thread->Timer ) ) {
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          _ISR_Enable( level );
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          _Thread_Unblock( the_thread );
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        }
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        else {
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          _Watchdog_Deactivate( &the_thread->Timer );
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          _ISR_Enable( level );
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          (void) _Watchdog_Remove( &the_thread->Timer );
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          _Thread_Unblock( the_thread );
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        }
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        return;
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      }
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    }
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    switch ( _Event_Sync_state ) {
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      case EVENT_SYNC_SYNCHRONIZED:
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      case EVENT_SYNC_SATISFIED:
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        break;
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      case EVENT_SYNC_NOTHING_HAPPENED:
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      case EVENT_SYNC_TIMEOUT:
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        if ( !_Thread_Is_executing( the_thread ) )
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          break;
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        if ( seized_events == event_condition || _Options_Is_any(option_set) ) {
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          api->pending_events =
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               _Event_sets_Clear( pending_events,seized_events );
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          *(rtems_event_set *)the_thread->Wait.return_argument = seized_events;
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          _Event_Sync_state = EVENT_SYNC_SATISFIED;
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        }
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        break;
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    }
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  }
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  _ISR_Enable( level );
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}

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