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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/scheduleredfimpl.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 '')
-rw-r--r-- | cpukit/score/include/rtems/score/scheduleredfimpl.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/cpukit/score/include/rtems/score/scheduleredfimpl.h b/cpukit/score/include/rtems/score/scheduleredfimpl.h index 8c4cd2c4bd..d424370a45 100644 --- a/cpukit/score/include/rtems/score/scheduleredfimpl.h +++ b/cpukit/score/include/rtems/score/scheduleredfimpl.h @@ -44,6 +44,31 @@ RTEMS_INLINE_ROUTINE Scheduler_EDF_Node *_Scheduler_EDF_Node_get( return (Scheduler_EDF_Node *) _Scheduler_Node_get( the_thread ); } +RTEMS_INLINE_ROUTINE void _Scheduler_EDF_Enqueue( + const Scheduler_Control *scheduler, + Thread_Control *the_thread +) +{ + Scheduler_EDF_Context *context = + _Scheduler_EDF_Get_context( scheduler ); + Scheduler_EDF_Node *node = _Scheduler_EDF_Node_get( the_thread ); + + _RBTree_Insert( &context->Ready, &node->Node ); + node->queue_state = SCHEDULER_EDF_QUEUE_STATE_YES; +} + +RTEMS_INLINE_ROUTINE void _Scheduler_EDF_Extract( + const Scheduler_Control *scheduler, + Thread_Control *the_thread +) +{ + Scheduler_EDF_Context *context = + _Scheduler_EDF_Get_context( scheduler ); + Scheduler_EDF_Node *node = _Scheduler_EDF_Node_get( the_thread ); + + _RBTree_Extract( &context->Ready, &node->Node ); +} + RTEMS_INLINE_ROUTINE void _Scheduler_EDF_Schedule_body( const Scheduler_Control *scheduler, Thread_Control *the_thread, |