/**
* @file
*
* @brief RTEMS Task Create
* @ingroup ClassicTasks
*/
/*
* COPYRIGHT (c) 1989-2014,2016.
* 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.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/rtems/tasksimpl.h>
#include <rtems/rtems/attrimpl.h>
#include <rtems/rtems/eventimpl.h>
#include <rtems/rtems/modesimpl.h>
#include <rtems/rtems/support.h>
#include <rtems/score/apimutex.h>
#include <rtems/score/schedulerimpl.h>
#include <rtems/score/stackimpl.h>
#include <rtems/score/sysstate.h>
#include <rtems/score/threadimpl.h>
#include <rtems/score/userextimpl.h>
#include <rtems/sysinit.h>
#include <string.h>
rtems_status_code rtems_task_create(
rtems_name name,
rtems_task_priority initial_priority,
size_t stack_size,
rtems_mode initial_modes,
rtems_attribute attribute_set,
rtems_id *id
)
{
Thread_Control *the_thread;
Thread_Configuration config;
#if defined(RTEMS_MULTIPROCESSING)
Objects_MP_Control *the_global_object = NULL;
bool is_global;
#endif
bool status;
rtems_attribute the_attribute_set;
bool valid;
RTEMS_API_Control *api;
ASR_Information *asr;
if ( !id )
return RTEMS_INVALID_ADDRESS;
if ( !rtems_is_name_valid( name ) )
return RTEMS_INVALID_NAME;
/*
* Core Thread Initialize insures we get the minimum amount of
* stack space.
*/
/*
* Fix the attribute set to match the attributes which
* this processor (1) requires and (2) is able to support.
* First add in the required flags for attribute_set
* Typically this might include FP if the platform
* or application required all tasks to be fp aware.
* Then turn off the requested bits which are not supported.
*/
the_attribute_set = _Attributes_Set( attribute_set, ATTRIBUTES_REQUIRED );
the_attribute_set =
_Attributes_Clear( the_attribute_set, ATTRIBUTES_NOT_SUPPORTED );
memset( &config, 0, sizeof( config ) );
config.budget_algorithm = _Modes_Is_timeslice( initial_modes ) ?
THREAD_CPU_BUDGET_ALGORITHM_RESET_TIMESLICE
: THREAD_CPU_BUDGET_ALGORITHM_NONE,
config.isr_level = _Modes_Get_interrupt_level( initial_modes );
config.name.name_u32 = name;
config.is_fp = _Attributes_Is_floating_point( the_attribute_set );
config.is_preemptible = _Modes_Is_preempt( initial_modes );
config.stack_size = _Stack_Ensure_minimum( stack_size );
config.stack_size = _Stack_Extend_size( config.stack_size, config.is_fp );
/*
* Validate the RTEMS API priority and convert it to the core priority range.
*/
if ( !_Attributes_Is_system_task( the_attribute_set ) ) {
if ( initial_priority == PRIORITY_MINIMUM ) {
return RTEMS_INVALID_PRIORITY;
}
}
config.scheduler = _Thread_Scheduler_get_home( _Thread_Get_executing() );
config.priority = _RTEMS_Priority_To_core(
config.scheduler,
initial_priority,
&valid
);
if ( !valid ) {
return RTEMS_INVALID_PRIORITY;
}
#if defined(RTEMS_MULTIPROCESSING)
if ( _Attributes_Is_global( the_attribute_set ) ) {
is_global = true;
if ( !_System_state_Is_multiprocessing )
return RTEMS_MP_NOT_CONFIGURED;
} else
is_global = false;
#endif
/*
* Allocate the thread control block and -- if the task is global --
* allocate a global object control block.
*
* NOTE: This routine does not use the combined allocate and open
* global object routine (_Objects_MP_Allocate_and_open) because
* this results in a lack of control over when memory is allocated
* and can be freed in the event of an error.
*/
the_thread = _RTEMS_tasks_Allocate();
if ( !the_thread ) {
_Objects_Allocator_unlock();
return RTEMS_TOO_MANY;
}
#if defined(RTEMS_MULTIPROCESSING)
if ( is_global ) {
the_global_object = _Objects_MP_Allocate_global_object();
if ( _Objects_MP_Is_null_global_object( the_global_object ) ) {
_RTEMS_tasks_Free( the_thread );
_Objects_Allocator_unlock();
return RTEMS_TOO_MANY;
}
}
#endif
config.stack_area = _Stack_Allocate( config.stack_size );
config.allocated_stack = config.stack_area;
status = ( config.stack_area != NULL );
/*
* Initialize the core thread for this task.
*/
if ( status ) {
status = _Thread_Initialize(
&_RTEMS_tasks_Information,
the_thread,
&config
);
}
if ( !status ) {
#if defined(RTEMS_MULTIPROCESSING)
if ( is_global )
_Objects_MP_Free_global_object( the_global_object );
#endif
_RTEMS_tasks_Free( the_thread );
_Objects_Allocator_unlock();
return RTEMS_UNSATISFIED;
}
api = the_thread->API_Extensions[ THREAD_API_RTEMS ];
asr = &api->Signal;
asr->is_enabled = _Modes_Is_asr_disabled(initial_modes) ? false : true;
*id = the_thread->Object.id;
#if defined(RTEMS_MULTIPROCESSING)
the_thread->is_global = is_global;
if ( is_global ) {
_Objects_MP_Open(
&_RTEMS_tasks_Information.Objects,
the_global_object,
name,
the_thread->Object.id
);
_RTEMS_tasks_MP_Send_process_packet(
RTEMS_TASKS_MP_ANNOUNCE_CREATE,
the_thread->Object.id,
name
);
}
#endif
_Objects_Allocator_unlock();
return RTEMS_SUCCESSFUL;
}
static void _RTEMS_tasks_Start_extension(
Thread_Control *executing,
Thread_Control *started
)
{
RTEMS_API_Control *api;
api = started->API_Extensions[ THREAD_API_RTEMS ];
_Event_Initialize( &api->Event );
_Event_Initialize( &api->System_event );
}
#if defined(RTEMS_MULTIPROCESSING)
static void _RTEMS_tasks_Terminate_extension( Thread_Control *executing )
{
if ( executing->is_global ) {
_Objects_MP_Close(
&_RTEMS_tasks_Information.Objects,
executing->Object.id
);
_RTEMS_tasks_MP_Send_process_packet(
RTEMS_TASKS_MP_ANNOUNCE_DELETE,
executing->Object.id,
0 /* Not used */
);
}
}
#endif
static User_extensions_Control _RTEMS_tasks_User_extensions = {
.Callouts = {
#if defined(RTEMS_MULTIPROCESSING)
.thread_terminate = _RTEMS_tasks_Terminate_extension,
#endif
.thread_start = _RTEMS_tasks_Start_extension,
.thread_restart = _RTEMS_tasks_Start_extension
}
};
static void _RTEMS_tasks_Manager_initialization( void )
{
_Thread_Initialize_information( &_RTEMS_tasks_Information );
_User_extensions_Add_API_set( &_RTEMS_tasks_User_extensions );
}
RTEMS_SYSINIT_ITEM(
_RTEMS_tasks_Manager_initialization,
RTEMS_SYSINIT_CLASSIC_TASKS,
RTEMS_SYSINIT_ORDER_MIDDLE
);