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/*
* Copyright (c) 2014 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/schedulerimpl.h>
typedef struct {
Thread_Control *root;
Thread_Control *needs_help;
} Scheduler_Set_root_context;
RTEMS_INLINE_ROUTINE bool _Scheduler_Set_root_visitor(
Resource_Node *resource_node,
void *arg
)
{
Scheduler_Set_root_context *ctx = arg;
Thread_Control *root = ctx->root;
Thread_Control *needs_help = root;
Thread_Control *offers_help =
THREAD_RESOURCE_NODE_TO_THREAD( resource_node );
const Scheduler_Control *scheduler = _Scheduler_Get_own( offers_help );
Thread_Control *needs_help_too;
_Resource_Node_set_root( resource_node, &root->Resource_node );
needs_help_too = ( *scheduler->Operations.ask_for_help )(
scheduler,
offers_help,
needs_help
);
if ( needs_help_too != needs_help && needs_help_too != NULL ) {
_Assert( ctx->needs_help == NULL );
ctx->needs_help = needs_help_too;
}
return false;
}
void _Scheduler_Thread_change_resource_root(
Thread_Control *top,
Thread_Control *root
)
{
Scheduler_Set_root_context ctx = { root, NULL };
Thread_Control *offers_help = top;
Scheduler_Node *offers_help_node;
Thread_Control *offers_help_too;
offers_help_node = _Scheduler_Thread_get_node( offers_help );
offers_help_too = _Scheduler_Node_get_owner( offers_help_node );
if ( offers_help != offers_help_too ) {
_Scheduler_Set_root_visitor( &offers_help_too->Resource_node, &ctx );
_Assert( ctx.needs_help == offers_help );
ctx.needs_help = NULL;
}
_Scheduler_Set_root_visitor( &top->Resource_node, &ctx );
_Resource_Iterate( &top->Resource_node, _Scheduler_Set_root_visitor, &ctx );
if ( ctx.needs_help != NULL ) {
_Scheduler_Ask_for_help( ctx.needs_help );
}
}
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