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/**
* @file
*
* @brief RTEMS Catch Signal
* @ingroup ClassicSignal
*/
/*
* COPYRIGHT (c) 1989-1999.
* 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/system.h>
#include <rtems/rtems/asrimpl.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/score/apiext.h>
#include <rtems/rtems/tasks.h>
static void _RTEMS_signal_Post_switch_hook( Thread_Control *executing )
{
ISR_Level level;
RTEMS_API_Control *api;
ASR_Information *asr;
rtems_signal_set signal_set;
Modes_Control prev_mode;
api = executing->API_Extensions[ THREAD_API_RTEMS ];
if ( !api )
return;
/*
* Signal Processing
*/
asr = &api->Signal;
_ISR_Disable( level );
signal_set = asr->signals_posted;
asr->signals_posted = 0;
_ISR_Enable( level );
if ( !signal_set ) /* similar to _ASR_Are_signals_pending( asr ) */
return;
asr->nest_level += 1;
rtems_task_mode( asr->mode_set, RTEMS_ALL_MODE_MASKS, &prev_mode );
(*asr->handler)( signal_set );
asr->nest_level -= 1;
rtems_task_mode( prev_mode, RTEMS_ALL_MODE_MASKS, &prev_mode );
}
static API_extensions_Post_switch_control _RTEMS_signal_Post_switch = {
.hook = _RTEMS_signal_Post_switch_hook
};
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_Get_executing();
api = (RTEMS_API_Control*)executing->API_Extensions[ THREAD_API_RTEMS ];
asr = &api->Signal;
_Thread_Disable_dispatch(); /* cannot reschedule while */
/* the thread is inconsistent */
_API_extensions_Add_post_switch( &_RTEMS_signal_Post_switch );
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;
}
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