Subversion Repositories openrisc_2011-10-31

/*

 *  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: eventtimeout.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_Timeout

 *

 *  This routine processes a thread which timeouts while waiting to

 *  receive an event_set. It is called by the watchdog handler.

 *

 *  Input parameters:

 *    id - thread id

 *

 *  Output parameters: NONE

 */

void _Event_Timeout(

  Objects_Id  id,

  void       *ignored

)

{

  Thread_Control *the_thread;

  Objects_Locations      location;

  the_thread = _Thread_Get( id, &location );

  switch ( location ) {

    case OBJECTS_REMOTE:  /* impossible */

    case OBJECTS_ERROR:

      break;

    case OBJECTS_LOCAL:

      /*

       *  If the event manager is not synchronized, then it is either

       *  "nothing happened", "timeout", or "satisfied".   If the_thread

       *  is the executing thread, then it is in the process of blocking

       *  and it is the thread which is responsible for the synchronization

       *  process.

       *

       *  If it is not satisfied, then it is "nothing happened" and

       *  this is the "timeout" transition.  After a request is satisfied,

       *  a timeout is not allowed to occur.

       */

      if ( _Event_Sync_state != EVENT_SYNC_SYNCHRONIZED &&

           _Thread_Is_executing( the_thread ) ) {

        if ( _Event_Sync_state != EVENT_SYNC_SATISFIED )

          _Event_Sync_state = EVENT_SYNC_TIMEOUT;

      } else {

        the_thread->Wait.return_code = RTEMS_TIMEOUT;

        _Thread_Unblock( the_thread );

      }

      _Thread_Unnest_dispatch();

      break;

  }

}