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/*
* Event Manager
*
* 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.com/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/rtems/event.h>
/*
* INTERRUPT LATENCY:
* before flash
* after flash
* check sync
*/
void _Event_Surrender(
Thread_Control *the_thread,
rtems_event_set event_in,
Event_Control *event,
Thread_blocking_operation_States *sync_state,
States_Control wait_state
)
{
ISR_Level level;
rtems_event_set pending_events;
rtems_event_set event_condition;
rtems_event_set seized_events;
rtems_option option_set;
option_set = the_thread->Wait.option;
_ISR_Disable( level );
_Event_sets_Post( event_in, &event->pending_events );
pending_events = event->pending_events;
event_condition = the_thread->Wait.count;
seized_events = _Event_sets_Get( pending_events, event_condition );
/*
* No events were seized in this operation
*/
if ( _Event_sets_Is_empty( seized_events ) ) {
_ISR_Enable( level );
return;
}
/*
* If we are in an ISR and sending to the current thread, then
* we have a critical section issue to deal with.
*/
if ( _ISR_Is_in_progress() &&
_Thread_Is_executing( the_thread ) &&
((*sync_state == THREAD_BLOCKING_OPERATION_TIMEOUT) ||
(*sync_state == THREAD_BLOCKING_OPERATION_NOTHING_HAPPENED)) ) {
if ( seized_events == event_condition || _Options_Is_any(option_set) ) {
event->pending_events = _Event_sets_Clear(
pending_events,
seized_events
);
the_thread->Wait.count = 0;
*(rtems_event_set *)the_thread->Wait.return_argument = seized_events;
*sync_state = THREAD_BLOCKING_OPERATION_SATISFIED;
}
_ISR_Enable( level );
return;
}
/*
* Otherwise, this is a normal send to another thread
*/
if ( _States_Are_set( the_thread->current_state, wait_state ) ) {
if ( seized_events == event_condition || _Options_Is_any( option_set ) ) {
event->pending_events = _Event_sets_Clear(
pending_events,
seized_events
);
the_thread->Wait.count = 0;
*(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;
}
}
_ISR_Enable( level );
}
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