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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.
*
* $Id$
*/
#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;
}
}
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