5
Last change
on this file since bbd6d27a was
5c3d250,
checked in by Sebastian Huber <sebastian.huber@…>, on 07/04/14 at 12:34:23
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score: Implement scheduler helping protocol
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.
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Property mode set to
100644
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File size:
861 bytes
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1 | /* |
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2 | * @file |
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3 | * |
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4 | * @brief Scheduler CBS Allocate |
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5 | * @ingroup ScoreScheduler |
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6 | */ |
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7 | |
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8 | /* |
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9 | * Copyright (C) 2011 Petr Benes. |
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10 | * Copyright (C) 2011 On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.org/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <rtems/score/schedulercbsimpl.h> |
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22 | |
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23 | void _Scheduler_CBS_Node_initialize( |
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24 | const Scheduler_Control *scheduler, |
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25 | Thread_Control *the_thread |
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26 | ) |
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27 | { |
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28 | Scheduler_CBS_Node *node = _Scheduler_CBS_Thread_get_node( the_thread ); |
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29 | |
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30 | (void) scheduler; |
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31 | |
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32 | _Scheduler_Node_do_initialize( &node->Base.Base, the_thread ); |
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33 | |
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34 | node->Base.thread = the_thread; |
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35 | node->Base.queue_state = SCHEDULER_EDF_QUEUE_STATE_NEVER_HAS_BEEN; |
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36 | node->cbs_server = NULL; |
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37 | } |
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