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/*
* Signal Manager
*
*
* COPYRIGHT (c) 1989-1997.
* On-Line Applications Research Corporation (OAR).
* Copyright assigned to U.S. Government, 1994.
*
* 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/asr.h>
#include <rtems/score/isr.h>
#include <rtems/rtems/modes.h>
#include <rtems/rtems/signal.h>
#include <rtems/score/thread.h>
#include <rtems/rtems/tasks.h>
/*PAGE
*
* _Signal_Manager_initialization
*
* This routine initializes all signal manager related data structures.
*
* Input parameters: NONE
*
* Output parameters: NONE
*/
void _Signal_Manager_initialization( void )
{
/*
* Register the MP Process Packet routine.
*/
_MPCI_Register_packet_processor(
MP_PACKET_SIGNAL,
_Signal_MP_Process_packet
);
}
/*PAGE
*
* rtems_signal_catch
*
* This directive allows a thread to specify what action to take when
* catching signals.
*
* Input parameters:
* handler - address of asynchronous signal routine (asr)
* ( NULL indicates asr is invalid )
* mode_set - mode value for asr
*
* Output parameters:
* RTEMS_SUCCESSFUL - always succeeds
*/
rtems_status_code rtems_signal_catch(
rtems_asr_entry asr_handler,
rtems_mode mode_set
)
{
Thread_Control *executing;
RTEMS_API_Control *api;
ASR_Information *asr;
/* XXX normalize mode */
executing = _Thread_Executing;
api = executing->API_Extensions[ THREAD_API_RTEMS ];
asr = &api->Signal;
_Thread_Disable_dispatch(); /* cannot reschedule while */
/* the thread is inconsistent */
if ( !_ASR_Is_null_handler( asr_handler ) ) {
asr->mode_set = mode_set;
asr->handler = asr_handler;
}
else
_ASR_Initialize( asr );
_Thread_Enable_dispatch();
return RTEMS_SUCCESSFUL;
}
/*PAGE
*
* rtems_signal_send
*
* This directive allows a thread to send signals to a thread.
*
* Input parameters:
* id - thread id
* signal_set - signal set
*
* Output parameters:
* RTEMS_SUCCESSFUL - if successful
* error code - if unsuccessful
*/
rtems_status_code rtems_signal_send(
Objects_Id id,
rtems_signal_set signal_set
)
{
register Thread_Control *the_thread;
Objects_Locations location;
RTEMS_API_Control *api;
ASR_Information *asr;
the_thread = _Thread_Get( id, &location );
switch ( location ) {
case OBJECTS_ERROR:
return RTEMS_INVALID_ID;
case OBJECTS_REMOTE:
return _Signal_MP_Send_request_packet(
SIGNAL_MP_SEND_REQUEST,
id,
signal_set
);
case OBJECTS_LOCAL:
api = the_thread->API_Extensions[ THREAD_API_RTEMS ];
asr = &api->Signal;
if ( ! _ASR_Is_null_handler( asr->handler ) ) {
if ( asr->is_enabled ) {
_ASR_Post_signals( signal_set, &asr->signals_posted );
the_thread->do_post_task_switch_extension = TRUE;
if ( _ISR_Is_in_progress() && _Thread_Is_executing( the_thread ) )
_ISR_Signals_to_thread_executing = TRUE;
} else {
_ASR_Post_signals( signal_set, &asr->signals_pending );
}
_Thread_Enable_dispatch();
return RTEMS_SUCCESSFUL;
}
_Thread_Enable_dispatch();
return RTEMS_NOT_DEFINED;
}
return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */
}
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