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/**
* @file
*
* @brief Timeout Event
* @ingroup ClassicEvent
*/
/*
* COPYRIGHT (c) 1989-2008.
* 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.rtems.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/rtems/eventimpl.h>
#include <rtems/score/threadimpl.h>
void _Event_Timeout(
Objects_Id id,
void *arg
)
{
Thread_Control *the_thread;
Objects_Locations location;
ISR_Level level;
Thread_blocking_operation_States *sync_state;
sync_state = arg;
the_thread = _Thread_Get( id, &location );
switch ( location ) {
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.
*/
_ISR_Disable( level );
/*
* Verify that the thread is still waiting for the event condition.
* This test is necessary to avoid state corruption if the timeout
* happens after the event condition is satisfied in
* _Event_Surrender(). A satisfied event condition is indicated with
* count set to zero.
*/
if ( !the_thread->Wait.count ) {
_ISR_Enable( level );
_Objects_Put_without_thread_dispatch( &the_thread->Object );
return;
}
the_thread->Wait.count = 0;
if ( _Thread_Is_executing( the_thread ) ) {
if ( *sync_state == THREAD_BLOCKING_OPERATION_NOTHING_HAPPENED )
*sync_state = THREAD_BLOCKING_OPERATION_TIMEOUT;
}
the_thread->Wait.return_code = RTEMS_TIMEOUT;
_ISR_Enable( level );
_Thread_Unblock( the_thread );
_Objects_Put_without_thread_dispatch( &the_thread->Object );
break;
#if defined(RTEMS_MULTIPROCESSING)
case OBJECTS_REMOTE: /* impossible */
#endif
case OBJECTS_ERROR:
break;
}
}
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