4.115
Last change
on this file since 25f5730f was
f39f667a,
checked in by Sebastian Huber <sebastian.huber@…>, on 05/14/14 at 11:50:48
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score: Simplify _Thread_Change_priority()
The function to change a thread priority was too complex. Simplify it
with a new scheduler operation. This increases the average case
performance due to the simplified logic. The interrupt disabled
critical section is a bit prolonged since now the extract, update and
enqueue steps are executed atomically. This should however not impact
the worst-case interrupt latency since at least for the Deterministic
Priority Scheduler this sequence can be carried out with a wee bit of
instructions and no loops.
Add _Scheduler_Change_priority() to replace the sequence of
- _Thread_Set_transient(),
- _Scheduler_Extract(),
- _Scheduler_Enqueue(), and
- _Scheduler_Enqueue_first().
Delete STATES_TRANSIENT, _States_Is_transient() and
_Thread_Set_transient() since this state is now superfluous.
With this change it is possible to get rid of the
SCHEDULER_SMP_NODE_IN_THE_AIR state. This considerably simplifies the
implementation of the new SMP locking protocols.
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Property mode set to
100644
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File size:
922 bytes
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1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup ScoreSchedulerSMP |
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5 | * |
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6 | * @brief SMP Scheduler Implementation |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2014 embedded brains GmbH. All rights reserved. |
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11 | * |
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12 | * embedded brains GmbH |
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13 | * Dornierstr. 4 |
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14 | * 82178 Puchheim |
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15 | * Germany |
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16 | * <rtems@embedded-brains.de> |
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17 | * |
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18 | * The license and distribution terms for this file may be |
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19 | * found in the file LICENSE in this distribution or at |
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20 | * http://www.rtems.org/license/LICENSE. |
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21 | */ |
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22 | |
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23 | #if HAVE_CONFIG_H |
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24 | #include "config.h" |
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25 | #endif |
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26 | |
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27 | #include <rtems/score/schedulerpriorityimpl.h> |
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28 | |
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29 | /* |
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30 | * Table with all valid state transitions. It is used in |
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31 | * _Scheduler_SMP_Node_change_state() in case RTEMS_DEBUG is defined. |
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32 | */ |
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33 | const bool _Scheduler_SMP_Node_valid_state_changes[ 3 ][ 3 ] = { |
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34 | /* FROM / TO BLOCKED SCHEDULED READY */ |
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35 | /* BLOCKED */ { false, true, true }, |
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36 | /* SCHEDULED */ { true, false, true }, |
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37 | /* READY */ { true, true, false } |
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38 | }; |
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