/*
* RTEMS Task Manager
*
*
* 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.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#include <rtems/system.h>
#include <rtems/rtems/status.h>
#include <rtems/rtems/support.h>
#include <rtems/rtems/modes.h>
#include <rtems/score/object.h>
#include <rtems/score/stack.h>
#include <rtems/score/states.h>
#include <rtems/rtems/tasks.h>
#include <rtems/score/thread.h>
#include <rtems/score/threadq.h>
#include <rtems/score/tod.h>
#include <rtems/score/userext.h>
#include <rtems/score/wkspace.h>
#include <rtems/score/apiext.h>
#include <rtems/score/sysstate.h>
/*PAGE
*
* _RTEMS_tasks_Create_extension
*
* This routine is an extension routine that is invoked as part
* of creating any type of task or thread in the system. If the
* task is created via another API, then this routine is invoked
* and this API given the opportunity to initialize its extension
* area.
*/
boolean _RTEMS_tasks_Create_extension(
Thread_Control *executing,
Thread_Control *created
)
{
RTEMS_API_Control *api;
api = _Workspace_Allocate( sizeof( RTEMS_API_Control ) );
if ( !api )
return FALSE;
created->API_Extensions[ THREAD_API_RTEMS ] = api;
api->pending_events = EVENT_SETS_NONE_PENDING;
_ASR_Initialize( &api->Signal );
created->task_variables = NULL;
return TRUE;
}
/*PAGE
*
* _RTEMS_tasks_Start_extension
*
* This extension routine is invoked when a task is started for the
* first time.
*/
User_extensions_routine _RTEMS_tasks_Start_extension(
Thread_Control *executing,
Thread_Control *started
)
{
RTEMS_API_Control *api;
api = started->API_Extensions[ THREAD_API_RTEMS ];
api->pending_events = EVENT_SETS_NONE_PENDING;
_ASR_Initialize( &api->Signal );
}
/*PAGE
*
* _RTEMS_tasks_Delete_extension
*
* This extension routine is invoked when a task is deleted.
*/
User_extensions_routine _RTEMS_tasks_Delete_extension(
Thread_Control *executing,
Thread_Control *deleted
)
{
rtems_task_variable_t *tvp, *next;
/*
* Free per task variable memory
*/
tvp = deleted->task_variables;
deleted->task_variables = NULL;
while (tvp) {
next = tvp->next;
if (tvp->dtor)
(*tvp->dtor)( tvp->ptr );
if (executing == deleted)
*tvp->ptr = tvp->gval;
_Workspace_Free( tvp );
tvp = next;
}
/*
* Free API specific memory
*/
(void) _Workspace_Free( deleted->API_Extensions[ THREAD_API_RTEMS ] );
deleted->API_Extensions[ THREAD_API_RTEMS ] = NULL;
}
/*PAGE
*
* _RTEMS_tasks_Switch_extension
*
* This extension routine is invoked at each context switch.
*/
void _RTEMS_tasks_Switch_extension(
Thread_Control *executing,
Thread_Control *heir
)
{
rtems_task_variable_t *tvp;
/*
* Per Task Variables
*/
tvp = executing->task_variables;
while (tvp) {
tvp->tval = *tvp->ptr;
*tvp->ptr = tvp->gval;
tvp = tvp->next;
}
tvp = heir->task_variables;
while (tvp) {
tvp->gval = *tvp->ptr;
*tvp->ptr = tvp->tval;
tvp = tvp->next;
}
}
/*PAGE
*
* _RTEMS_tasks_Post_switch_extension
*
* This extension routine is invoked at each context switch.
*/
void _RTEMS_tasks_Post_switch_extension(
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 ];
/*
* 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 );
}
API_extensions_Control _RTEMS_tasks_API_extensions = {
{ NULL, NULL },
NULL, /* predriver */
_RTEMS_tasks_Initialize_user_tasks, /* postdriver */
_RTEMS_tasks_Post_switch_extension /* post switch */
};
User_extensions_Control _RTEMS_tasks_User_extensions = {
{ NULL, NULL },
{ _RTEMS_tasks_Create_extension, /* create */
_RTEMS_tasks_Start_extension, /* start */
_RTEMS_tasks_Start_extension, /* restart */
_RTEMS_tasks_Delete_extension, /* delete */
_RTEMS_tasks_Switch_extension, /* switch */
NULL, /* begin */
NULL, /* exitted */
NULL /* fatal */
}
};
/*PAGE
*
* _RTEMS_tasks_Manager_initialization
*
* This routine initializes all Task Manager related data structures.
*
* Input parameters:
* maximum_tasks - number of tasks to initialize
*
* Output parameters: NONE
*/
void _RTEMS_tasks_Manager_initialization(
unsigned32 maximum_tasks,
unsigned32 number_of_initialization_tasks,
rtems_initialization_tasks_table *user_tasks
)
{
_RTEMS_tasks_Number_of_initialization_tasks = number_of_initialization_tasks;
_RTEMS_tasks_User_initialization_tasks = user_tasks;
/*
* There may not be any RTEMS initialization tasks configured.
*/
#if 0
if ( user_tasks == NULL || number_of_initialization_tasks == 0 )
_Internal_error_Occurred( INTERNAL_ERROR_RTEMS_API, TRUE, RTEMS_TOO_MANY );
#endif
_Objects_Initialize_information(
&_RTEMS_tasks_Information,
OBJECTS_RTEMS_TASKS,
TRUE,
maximum_tasks,
sizeof( Thread_Control ),
FALSE,
RTEMS_MAXIMUM_NAME_LENGTH,
TRUE
);
/*
* Add all the extensions for this API
*/
_User_extensions_Add_API_set( &_RTEMS_tasks_User_extensions );
_API_extensions_Add( &_RTEMS_tasks_API_extensions );
/*
* Register the MP Process Packet routine.
*/
#if defined(RTEMS_MULTIPROCESSING)
_MPCI_Register_packet_processor(
MP_PACKET_TASKS,
_RTEMS_tasks_MP_Process_packet
);
#endif
}
