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/*
* Copyright (c) 2016 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* 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/tasks.h>
#include <rtems/score/assert.h>
#include <rtems/score/schedulerimpl.h>
#include <rtems/config.h>
rtems_status_code rtems_scheduler_add_processor(
rtems_id scheduler_id,
uint32_t cpu_index
)
{
uint32_t scheduler_index;
#if defined(RTEMS_SMP)
Per_CPU_Control *cpu;
rtems_status_code status;
#endif
scheduler_index = _Scheduler_Get_index_by_id( scheduler_id );
if ( scheduler_index >= _Scheduler_Count ) {
return RTEMS_INVALID_ID;
}
if ( cpu_index >= rtems_configuration_get_maximum_processors() ) {
return RTEMS_NOT_CONFIGURED;
}
#if defined(RTEMS_SMP)
cpu = _Per_CPU_Get_by_index( cpu_index );
if ( _Scheduler_Initial_assignments[ cpu_index ].scheduler == NULL ) {
return RTEMS_NOT_CONFIGURED;
}
if ( !_Per_CPU_Is_processor_online( cpu ) ) {
return RTEMS_INCORRECT_STATE;
}
_Objects_Allocator_lock();
if ( cpu->Scheduler.control == NULL ) {
const Scheduler_Control *scheduler;
Scheduler_Context *scheduler_context;
Priority_Control idle_priority;
Thread_Control *idle;
Scheduler_Node *scheduler_node;
ISR_lock_Context lock_context;
Thread_queue_Context queue_context;
Per_CPU_Control *cpu_self;
scheduler = &_Scheduler_Table[ scheduler_index ];
scheduler_context = _Scheduler_Get_context( scheduler );
idle_priority =
_Scheduler_Map_priority( scheduler, scheduler->maximum_priority );
idle = cpu->Scheduler.idle_if_online_and_unused;
_Assert( idle != NULL );
cpu->Scheduler.idle_if_online_and_unused = NULL;
idle->Scheduler.home = scheduler;
idle->Start.initial_priority = idle_priority;
scheduler_node =
_Thread_Scheduler_get_node_by_index( idle, scheduler_index );
_Priority_Node_set_priority( &idle->Real_priority, idle_priority );
_Priority_Initialize_one(
&scheduler_node->Wait.Priority,
&idle->Real_priority
);
_Assert( _Chain_Is_empty( &idle->Scheduler.Wait_nodes ) );
_Chain_Initialize_one(
&idle->Scheduler.Wait_nodes,
&scheduler_node->Thread.Wait_node
);
_Assert( _Chain_Is_empty( &idle->Scheduler.Scheduler_nodes ) );
_Chain_Initialize_one(
&idle->Scheduler.Scheduler_nodes,
&scheduler_node->Thread.Scheduler_node.Chain
);
_ISR_lock_ISR_disable( &lock_context );
_Scheduler_Acquire_critical( scheduler, &lock_context );
++scheduler_context->processor_count;
cpu->Scheduler.control = scheduler;
cpu->Scheduler.context = scheduler_context;
( *scheduler->Operations.add_processor )( scheduler, idle );
cpu_self = _Thread_Dispatch_disable_critical(
&queue_context.Lock_context.Lock_context
);
_Scheduler_Release_critical( scheduler, &lock_context );
_ISR_lock_ISR_enable( &lock_context );
_Thread_Dispatch_enable( cpu_self );
status = RTEMS_SUCCESSFUL;
} else {
status = RTEMS_RESOURCE_IN_USE;
}
_Objects_Allocator_unlock();
return status;
#else
return RTEMS_RESOURCE_IN_USE;
#endif
}
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