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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/schedulerprioritysmp.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/schedulerprioritysmp.h')
-rw-r--r-- | cpukit/score/include/rtems/score/schedulerprioritysmp.h | 23 |
1 files changed, 9 insertions, 14 deletions
diff --git a/cpukit/score/include/rtems/score/schedulerprioritysmp.h b/cpukit/score/include/rtems/score/schedulerprioritysmp.h index 3e7d22f81d..a22b323e93 100644 --- a/cpukit/score/include/rtems/score/schedulerprioritysmp.h +++ b/cpukit/score/include/rtems/score/schedulerprioritysmp.h @@ -7,7 +7,7 @@ */ /* - * Copyright (c) 2013 embedded brains GmbH. All rights reserved. + * Copyright (c) 2013-2014 embedded brains GmbH. All rights reserved. * * embedded brains GmbH * Dornierstr. 4 @@ -82,13 +82,11 @@ typedef struct { _Scheduler_priority_SMP_Schedule, \ _Scheduler_priority_SMP_Yield, \ _Scheduler_priority_SMP_Block, \ - _Scheduler_priority_SMP_Enqueue_fifo, \ + _Scheduler_priority_SMP_Unblock, \ + _Scheduler_priority_SMP_Change_priority, \ _Scheduler_priority_SMP_Allocate, \ _Scheduler_default_Free, \ _Scheduler_priority_SMP_Update, \ - _Scheduler_priority_SMP_Enqueue_fifo, \ - _Scheduler_priority_SMP_Enqueue_lifo, \ - _Scheduler_priority_SMP_Extract, \ _Scheduler_priority_Priority_compare, \ _Scheduler_default_Release_job, \ _Scheduler_default_Tick, \ @@ -114,22 +112,19 @@ void _Scheduler_priority_SMP_Block( Thread_Control *thread ); -void _Scheduler_priority_SMP_Update( +void _Scheduler_priority_SMP_Unblock( const Scheduler_Control *scheduler, Thread_Control *thread ); -void _Scheduler_priority_SMP_Enqueue_fifo( +void _Scheduler_priority_SMP_Change_priority( const Scheduler_Control *scheduler, - Thread_Control *thread + Thread_Control *the_thread, + Priority_Control new_priority, + bool prepend_it ); -void _Scheduler_priority_SMP_Enqueue_lifo( - const Scheduler_Control *scheduler, - Thread_Control *thread -); - -void _Scheduler_priority_SMP_Extract( +void _Scheduler_priority_SMP_Update( const Scheduler_Control *scheduler, Thread_Control *thread ); |