4.115
Last change
on this file since 8ae37323 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:
544 bytes
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1 | /* |
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2 | * Copyright (c) 2014 embedded brains GmbH |
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3 | * |
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4 | * The license and distribution terms for this file may be |
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5 | * found in the file LICENSE in this distribution or at |
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6 | * http://www.rtems.org/license/LICENSE. |
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7 | */ |
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8 | |
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9 | #if HAVE_CONFIG_H |
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10 | #include "config.h" |
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11 | #endif |
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12 | |
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13 | #include <rtems/score/scheduler.h> |
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14 | |
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15 | Thread_Control *_Scheduler_default_Ask_for_help( |
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16 | const Scheduler_Control *scheduler, |
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17 | Thread_Control *offers_help, |
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18 | Thread_Control *needs_help |
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19 | ) |
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20 | { |
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21 | (void) scheduler; |
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22 | (void) offers_help; |
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23 | (void) needs_help; |
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24 | |
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25 | return NULL; |
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26 | } |
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