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/**
* @file
*
* @brief Surrender 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/rtems/optionsimpl.h>
#include <rtems/score/threadimpl.h>
#include <rtems/score/watchdogimpl.h>
static void _Event_Satisfy(
Thread_Control *the_thread,
Event_Control *event,
rtems_event_set pending_events,
rtems_event_set seized_events
)
{
event->pending_events = _Event_sets_Clear( pending_events, seized_events );
*(rtems_event_set *) the_thread->Wait.return_argument = seized_events;
}
static bool _Event_Is_satisfied(
const Thread_Control *the_thread,
rtems_event_set pending_events,
rtems_event_set *seized_events
)
{
rtems_option option_set;
rtems_event_set event_condition;
option_set = the_thread->Wait.option;
event_condition = the_thread->Wait.count;
*seized_events = _Event_sets_Get( pending_events, event_condition );
return !_Event_sets_Is_empty( *seized_events )
&& ( *seized_events == event_condition || _Options_Is_any( option_set ) );
}
void _Event_Surrender(
Thread_Control *the_thread,
rtems_event_set event_in,
Event_Control *event,
Thread_Wait_flags wait_class,
ISR_lock_Context *lock_context
)
{
rtems_event_set pending_events;
rtems_event_set seized_events;
Thread_Wait_flags wait_flags;
bool unblock;
_Thread_Lock_acquire_default_critical( the_thread, lock_context );
_Event_sets_Post( event_in, &event->pending_events );
pending_events = event->pending_events;
wait_flags = _Thread_Wait_flags_get( the_thread );
if (
( wait_flags & THREAD_WAIT_CLASS_MASK ) == wait_class
&& _Event_Is_satisfied( the_thread, pending_events, &seized_events )
) {
Thread_Wait_flags intend_to_block;
Thread_Wait_flags blocked;
bool success;
intend_to_block = wait_class | THREAD_WAIT_STATE_INTEND_TO_BLOCK;
blocked = wait_class | THREAD_WAIT_STATE_BLOCKED;
success = _Thread_Wait_flags_try_change_critical(
the_thread,
intend_to_block,
wait_class | THREAD_WAIT_STATE_READY_AGAIN
);
if ( success ) {
_Event_Satisfy( the_thread, event, pending_events, seized_events );
unblock = false;
} else if ( _Thread_Wait_flags_get( the_thread ) == blocked ) {
_Event_Satisfy( the_thread, event, pending_events, seized_events );
_Thread_Wait_flags_set(
the_thread,
wait_class | THREAD_WAIT_STATE_READY_AGAIN
);
unblock = true;
} else {
unblock = false;
}
} else {
unblock = false;
}
if ( unblock ) {
Per_CPU_Control *cpu_self;
cpu_self = _Thread_Dispatch_disable_critical( lock_context );
_Thread_Lock_release_default( the_thread, lock_context );
_Giant_Acquire( cpu_self );
_Watchdog_Remove_ticks( &the_thread->Timer );
_Thread_Unblock( the_thread );
_Giant_Release( cpu_self );
_Thread_Dispatch_enable( cpu_self );
} else {
_Thread_Lock_release_default( the_thread, lock_context );
}
}
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