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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/score/threadimpl.h>
#include <rtems/score/schedulerimpl.h>
#if defined(RTEMS_SMP)
void _Thread_Scheduler_ask_for_help( Thread_Control *the_thread )
{
Chain_Node *node;
const Chain_Node *tail;
node = _Chain_First( &the_thread->Scheduler.Scheduler_nodes );
tail = _Chain_Immutable_tail( &the_thread->Scheduler.Scheduler_nodes );
do {
Scheduler_Node *scheduler_node;
const Scheduler_Control *scheduler;
ISR_lock_Context lock_context;
bool success;
scheduler_node = SCHEDULER_NODE_OF_THREAD_SCHEDULER_NODE( node );
scheduler = _Scheduler_Node_get_scheduler( scheduler_node );
_Scheduler_Acquire_critical( scheduler, &lock_context );
success = ( *scheduler->Operations.ask_for_help )(
scheduler,
the_thread,
scheduler_node
);
_Scheduler_Release_critical( scheduler, &lock_context );
if ( success ) {
break;
}
node = _Chain_Next( node );
} while ( node != tail );
}
void _Thread_Scheduler_process_requests( Thread_Control *the_thread )
{
ISR_lock_Context lock_context;
Scheduler_Node *scheduler_node;
_Thread_Scheduler_acquire_critical( the_thread, &lock_context );
scheduler_node = the_thread->Scheduler.requests;
if ( scheduler_node != NULL ) {
Scheduler_Node *next;
Scheduler_Node *remove;
the_thread->Scheduler.requests = NULL;
remove = NULL;
do {
Scheduler_Node_request request;
request = scheduler_node->Thread.request;
scheduler_node->Thread.request = SCHEDULER_NODE_REQUEST_NOT_PENDING;
next = scheduler_node->Thread.next_request;
#if defined(RTEMS_DEBUG)
scheduler_node->Thread.next_request = NULL;
#endif
if ( request == SCHEDULER_NODE_REQUEST_ADD ) {
++the_thread->Scheduler.helping_nodes;
_Chain_Append_unprotected(
&the_thread->Scheduler.Scheduler_nodes,
&scheduler_node->Thread.Scheduler_node.Chain
);
} else if ( request == SCHEDULER_NODE_REQUEST_REMOVE ) {
--the_thread->Scheduler.helping_nodes;
_Chain_Extract_unprotected(
&scheduler_node->Thread.Scheduler_node.Chain
);
scheduler_node->Thread.Scheduler_node.next = remove;
remove = scheduler_node;
} else {
_Assert( request == SCHEDULER_NODE_REQUEST_NOTHING );
}
scheduler_node = next;
} while ( scheduler_node != NULL );
_Thread_Scheduler_release_critical( the_thread, &lock_context );
scheduler_node = remove;
while ( scheduler_node != NULL ) {
const Scheduler_Control *scheduler;
ISR_lock_Context lock_context;
next = scheduler_node->Thread.Scheduler_node.next;
#if defined(RTEMS_DEBUG)
scheduler_node->Thread.Scheduler_node.next = NULL;
#endif
scheduler = _Scheduler_Node_get_scheduler( scheduler_node );
_Scheduler_Acquire_critical( scheduler, &lock_context );
( *scheduler->Operations.withdraw_node )(
scheduler,
the_thread,
scheduler_node,
THREAD_SCHEDULER_READY
);
_Scheduler_Release_critical( scheduler, &lock_context );
scheduler_node = next;
}
} else {
_Thread_Scheduler_release_critical( the_thread, &lock_context );
}
}
#endif
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