forked from Imagelibrary/rtems
5c3d250959
The following scheduler operations return a thread in need for help
- unblock,
- change priority, and
- yield.
A thread in need for help is a thread that encounters a scheduler state
change from scheduled to ready or a thread that cannot be scheduled in
an unblock operation. Such a thread can ask threads which depend on
resources owned by this thread for help.
Add a new ask for help scheduler operation. This operation is used by
_Scheduler_Ask_for_help() to help threads in need for help returned by
the operations mentioned above. This operation is also used by
_Scheduler_Thread_change_resource_root() in case the root of a resource
sub-tree changes. A use case is the ownership change of a resource.
In case it is not possible to schedule a thread in need for help, then
the corresponding scheduler node will be placed into the set of ready
scheduler nodes of the scheduler instance. Once a state change from
ready to scheduled happens for this scheduler node it may be used to
schedule the thread in need for help.
37 lines
820 B
C
37 lines
820 B
C
/**
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* @file
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*
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* @brief Scheduler EDF Allocate
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* @ingroup ScoreScheduler
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*/
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/*
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* Copyright (C) 2011 Petr Benes.
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* Copyright (C) 2011 On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#if HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <rtems/score/scheduleredfimpl.h>
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void _Scheduler_EDF_Node_initialize(
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const Scheduler_Control *scheduler,
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Thread_Control *the_thread
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)
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{
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Scheduler_EDF_Node *node = _Scheduler_EDF_Thread_get_node( the_thread );
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(void) scheduler;
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_Scheduler_Node_do_initialize( &node->Base, the_thread );
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node->thread = the_thread;
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node->queue_state = SCHEDULER_EDF_QUEUE_STATE_NEVER_HAS_BEEN;
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}
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