/*
* Event Manager
*
* COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
* On-Line Applications Research Corporation (OAR).
* All rights assigned to U.S. Government, 1994.
*
* This material may be reproduced by or for the U.S. Government pursuant
* to the copyright license under the clause at DFARS 252.227-7013. This
* notice must appear in all copies of this file and its derivatives.
*
* $Id$
*/
#include <rtems/system.h>
#include <rtems/event.h>
#include <rtems/isr.h>
#include <rtems/object.h>
#include <rtems/options.h>
#include <rtems/states.h>
#include <rtems/thread.h>
/*PAGE
*
* rtems_event_send
*
* This directive allows a thread send an event set to another thread.
*
* Input parameters:
* id - thread id
* event - event set
*
* Output parameters:
* RTEMS_SUCCESSFUL - if successful
* error code - if unsuccessful
*/
rtems_status_code rtems_event_send(
Objects_Id id,
rtems_event_set event_in
)
{
register Thread_Control *the_thread;
Objects_Locations location;
the_thread = _Thread_Get( id, &location );
switch ( location ) {
case OBJECTS_ERROR:
return( RTEMS_INVALID_ID );
case OBJECTS_REMOTE:
return(
_Event_MP_Send_request_packet(
EVENT_MP_SEND_REQUEST,
id,
event_in
)
);
case OBJECTS_LOCAL:
_Event_sets_Post( event_in, &the_thread->pending_events );
_Event_Surrender( the_thread );
_Thread_Enable_dispatch();
return( RTEMS_SUCCESSFUL );
}
return( RTEMS_INTERNAL_ERROR ); /* unreached - only to remove warnings */
}
/*PAGE
*
* rtems_event_receive
*
* This directive allows a thread to receive a set of events.
*
* Input parameters:
* event_in - input event condition
* option_set - options
* ticks - number of ticks to wait (0 means wait forever)
* event_out - pointer to output event set
*
* Output parameters:
* event out - event set
* RTEMS_SUCCESSFUL - if successful
* error code - if unsuccessful
*/
rtems_status_code rtems_event_receive(
rtems_event_set event_in,
rtems_option option_set,
rtems_interval ticks,
rtems_event_set *event_out
)
{
if ( _Event_sets_Is_empty( event_in ) ) {
*event_out = _Thread_Executing->pending_events;
return( RTEMS_SUCCESSFUL );
}
_Thread_Disable_dispatch();
_Event_Seize( event_in, option_set, ticks );
_Thread_Enable_dispatch();
*event_out = _Thread_Executing->events_out;
return( _Thread_Executing->Wait.return_code );
}
/*PAGE
*
* _Event_Seize
*
* This routine attempts to satisfy the requested event condition
* for the running thread.
*
* Input parameters:
* event_in - the event condition to satisfy
* option_set - acquire event options
* ticks - interval to wait
*
* Output parameters: NONE
*
* INTERRUPT LATENCY:
* available
* wait
* check sync
*/
void _Event_Seize(
rtems_event_set event_in,
rtems_option option_set,
rtems_interval ticks
)
{
Thread_Control *executing;
rtems_event_set seized_events;
rtems_event_set pending_events;
ISR_Level level;
executing = _Thread_Executing;
executing->Wait.return_code = RTEMS_SUCCESSFUL;
_ISR_Disable( level );
pending_events = executing->pending_events;
seized_events = _Event_sets_Get( pending_events, event_in );
if ( !_Event_sets_Is_empty( seized_events ) &&
(seized_events == event_in || _Options_Is_any( option_set )) ) {
executing->pending_events =
_Event_sets_Clear( pending_events, seized_events );
_ISR_Enable( level );
executing->events_out = seized_events;
return;
}
if ( _Options_Is_no_wait( option_set ) ) {
_ISR_Enable( level );
executing->Wait.return_code = RTEMS_UNSATISFIED;
executing->events_out = seized_events;
return;
}
_Event_Sync = TRUE;
executing->Wait.option_set = option_set;
executing->Wait.Extra.event_condition = event_in;
_ISR_Enable( level );
_Thread_Set_state( executing, STATES_WAITING_FOR_EVENT );
if ( ticks ) {
_Watchdog_Initialize(
&executing->Timer,
_Event_Timeout,
executing->Object.id,
NULL
);
_Watchdog_Insert_ticks(
&executing->Timer,
ticks,
WATCHDOG_NO_ACTIVATE
);
}
_ISR_Disable( level );
if ( _Event_Sync == TRUE ) {
_Event_Sync = FALSE;
if ( ticks )
_Watchdog_Activate( &executing->Timer );
_ISR_Enable( level );
return;
}
_ISR_Enable( level );
(void) _Watchdog_Remove( &executing->Timer );
_Thread_Unblock( executing );
return;
}
/*PAGE
*
* _Event_Surrender
*
* This routines remove a thread from the specified threadq.
*
* Input parameters:
* the_thread - pointer to thread to be dequeued
*
* Output parameters: NONE
*
* INTERRUPT LATENCY:
* before flash
* after flash
* check sync
*/
void _Event_Surrender(
Thread_Control *the_thread
)
{
ISR_Level level;
rtems_event_set pending_events;
rtems_event_set event_condition;
rtems_event_set seized_events;
_ISR_Disable( level );
pending_events = the_thread->pending_events;
event_condition = the_thread->Wait.Extra.event_condition;
seized_events = _Event_sets_Get( pending_events, event_condition );
if ( !_Event_sets_Is_empty( seized_events ) ) {
if ( _States_Is_waiting_for_event( the_thread->current_state ) ) {
if ( seized_events == event_condition ||
_Options_Is_any( the_thread->Wait.option_set ) ) {
the_thread->pending_events =
_Event_sets_Clear( pending_events, seized_events );
(rtems_event_set *)the_thread->events_out = 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;
}
}
else if ( _Thread_Is_executing( the_thread ) && _Event_Sync == TRUE ) {
if ( seized_events == event_condition ||
_Options_Is_any( the_thread->Wait.option_set ) ) {
the_thread->pending_events =
_Event_sets_Clear( pending_events,seized_events );
(rtems_event_set *)the_thread->events_out = seized_events;
_Event_Sync = FALSE;
}
}
}
_ISR_Enable( level );
}
/*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_ERROR:
case OBJECTS_REMOTE: /* impossible */
break;
case OBJECTS_LOCAL:
the_thread->Wait.return_code = RTEMS_TIMEOUT;
_Thread_Unblock( the_thread );
_Thread_Unnest_dispatch();
break;
}
}
