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author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2014-05-14 13:50:48 +0200 |
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committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2014-05-15 12:18:44 +0200 |
commit | f39f667a69cf5c4bc0dd4555537615022767f0f9 (patch) | |
tree | f8a48b3c7bf443001b036ddcab6ed104210e6134 /cpukit/score/include/rtems/score/schedulerpriorityimpl.h | |
parent | score: Add and use _Scheduler_Get_context() (diff) | |
download | rtems-f39f667a69cf5c4bc0dd4555537615022767f0f9.tar.bz2 |
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.
Diffstat (limited to 'cpukit/score/include/rtems/score/schedulerpriorityimpl.h')
-rw-r--r-- | cpukit/score/include/rtems/score/schedulerpriorityimpl.h | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/cpukit/score/include/rtems/score/schedulerpriorityimpl.h b/cpukit/score/include/rtems/score/schedulerpriorityimpl.h index ae0cd1ad9b..95d8e6ae34 100644 --- a/cpukit/score/include/rtems/score/schedulerpriorityimpl.h +++ b/cpukit/score/include/rtems/score/schedulerpriorityimpl.h @@ -196,28 +196,27 @@ RTEMS_INLINE_ROUTINE void _Scheduler_priority_Schedule_body( } /** - * @brief Updates the specified ready queue data according to the current - * priority of the thread. + * @brief Updates the specified ready queue data according to the new priority + * value. * - * @param[in] the_thread The thread. * @param[in] ready_queue The ready queue. + * @param[in] new_priority The new priority. * @param[in] bit_map The priority bit map of the scheduler instance. * @param[in] ready_queues The ready queues of the scheduler instance. */ RTEMS_INLINE_ROUTINE void _Scheduler_priority_Ready_queue_update( - Thread_Control *the_thread, Scheduler_priority_Ready_queue *ready_queue, + Priority_Control new_priority, Priority_bit_map_Control *bit_map, Chain_Control *ready_queues ) { - Priority_Control priority = the_thread->current_priority; - ready_queue->ready_chain = &ready_queues[ priority ]; + ready_queue->ready_chain = &ready_queues[ new_priority ]; _Priority_bit_map_Initialize_information( bit_map, &ready_queue->Priority_map, - priority + new_priority ); } |