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| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2014-05-14 13:50:48 +0200 |
|---|---|---|
| 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/schedulercbs.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/schedulercbs.h')
| -rw-r--r-- | cpukit/score/include/rtems/score/schedulercbs.h | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/cpukit/score/include/rtems/score/schedulercbs.h b/cpukit/score/include/rtems/score/schedulercbs.h index 6cfdfbe959..46db8e5609 100644 --- a/cpukit/score/include/rtems/score/schedulercbs.h +++ b/cpukit/score/include/rtems/score/schedulercbs.h @@ -52,12 +52,10 @@ extern "C" { _Scheduler_EDF_Yield, /* yield entry point */ \ _Scheduler_EDF_Block, /* block entry point */ \ _Scheduler_CBS_Unblock, /* unblock entry point */ \ + _Scheduler_EDF_Change_priority, /* change priority entry point */ \ _Scheduler_CBS_Allocate, /* allocate entry point */ \ _Scheduler_default_Free, /* free entry point */ \ _Scheduler_EDF_Update, /* update entry point */ \ - _Scheduler_EDF_Enqueue, /* enqueue entry point */ \ - _Scheduler_EDF_Enqueue_first, /* enqueue_first entry point */ \ - _Scheduler_EDF_Extract, /* extract entry point */ \ _Scheduler_EDF_Priority_compare, /* compares two priorities */ \ _Scheduler_CBS_Release_job, /* new period of task */ \ _Scheduler_default_Tick, /* tick entry point */ \ |