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Diffstat (limited to 'cpukit/rtems/src/signal.c')
-rw-r--r-- | cpukit/rtems/src/signal.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/cpukit/rtems/src/signal.c b/cpukit/rtems/src/signal.c new file mode 100644 index 0000000000..9f6d8df1a3 --- /dev/null +++ b/cpukit/rtems/src/signal.c @@ -0,0 +1,149 @@ +/* + * 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 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 */ +} |