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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 /doc/user/glossary.texi | |
| 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 'doc/user/glossary.texi')
| -rw-r--r-- | doc/user/glossary.texi | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/doc/user/glossary.texi b/doc/user/glossary.texi index 0aafa69186..cff7028cb7 100644 --- a/doc/user/glossary.texi +++ b/doc/user/glossary.texi @@ -278,11 +278,6 @@ access an active object. A special low priority task which assumes control of the CPU when no other task is able to execute. -@item in the air task -A task is @dfn{in the air} if it is in a transient state and has a processor -assigned. The next scheduler operation will turn it into a blocked, ready or -scheduled task. This state is specific to SMP configurations. - @item interface A specification of the methodology used to connect multiple independent subsystems. |