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/**
* @file
*
* @ingroup RTEMSImplClassicSignal
*
* @brief This source file contains the implementation of
* rtems_signal_catch() and the Signal Manager multiprocessing (MP) support
* system initialization.
*/
/*
* 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.org/license/LICENSE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/rtems/signalimpl.h>
#include <rtems/rtems/modesimpl.h>
#include <rtems/rtems/tasksdata.h>
#include <rtems/score/threadimpl.h>
RTEMS_STATIC_ASSERT( RTEMS_DEFAULT_MODES == 0, _ASR_Create_mode_set );
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;
ISR_lock_Context lock_context;
#if defined(RTEMS_SMP) || CPU_ENABLE_ROBUST_THREAD_DISPATCH == TRUE
if (
asr_handler != NULL &&
!_Modes_Is_interrupt_level_supported( mode_set )
) {
return RTEMS_NOT_IMPLEMENTED;
}
#endif
executing = _Thread_State_acquire_for_executing( &lock_context );
#if defined(RTEMS_SMP)
if (
asr_handler != NULL &&
!_Modes_Is_preempt_mode_supported( mode_set, executing )
) {
_Thread_State_release( executing, &lock_context );
return RTEMS_NOT_IMPLEMENTED;
}
#endif
api = executing->API_Extensions[ THREAD_API_RTEMS ];
asr = &api->Signal;
asr->handler = asr_handler;
asr->mode_set = mode_set;
#if defined(RTEMS_SMP)
if ( asr_handler == NULL ) {
Chain_Node *node;
/*
* In SMP configurations, signals may be sent on other processors
* (interrupts or threads) in parallel. This will cause an inter-processor
* interrupt which may be blocked by the above interrupt disable.
*/
node = &api->Signal_action.Node;
_Assert( asr->signals_pending == 0 || !_Chain_Is_node_off_chain( node ) );
_Assert( asr->signals_pending != 0 || _Chain_Is_node_off_chain( node ) );
if ( !_Chain_Is_node_off_chain( node ) ) {
asr->signals_pending = 0;
_Chain_Extract_unprotected( node );
_Chain_Set_off_chain( node );
}
}
#else
/*
* In uniprocessor configurations, as soon as interrupts are disabled above
* nobody can send signals to the executing thread. So, pending signals at
* this point cannot appear.
*/
_Assert( asr->signals_pending == 0 );
_Assert( _Chain_Is_node_off_chain( &api->Signal_action.Node ) );
#endif
_Thread_State_release( executing, &lock_context );
return RTEMS_SUCCESSFUL;
}
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