[rtems-docs commit] c-user: Add scheduler glossary terms
sebh at rtems.org
Wed Apr 14 04:53:52 UTC 2021
Author: Sebastian Huber <sebastian.huber at embedded-brains.de>
Date: Mon Apr 12 11:28:56 2021 +0200
c-user: Add scheduler glossary terms
Add glossary terms which characterize the relationship of a scheduler to
c-user/glossary.rst | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/c-user/glossary.rst b/c-user/glossary.rst
index 8aa1266..71a0242 100644
@@ -240,6 +240,10 @@ Glossary
This term is an acronym for
`Executable and Linkable Format <https://en.wikipedia.org/wiki/Executable_and_Linkable_Format>`_.
+ eligible scheduler
+ An eligible scheduler of a :term:`task` is a :term:`scheduler` which can be
+ used by the task to allocate a processor for the task.
An application that is delivered as a hidden part of a larger system.
For example, the software in a fuel-injection control system is an
@@ -336,9 +340,20 @@ Glossary
dispatch is marked as necessary, then the next thread dispatch will make
the heir task the executing task.
+ helping scheduler
+ A helping scheduler of a :term:`task` is a :term:`scheduler` which is a
+ :term:`eligible scheduler` and which is not the :term:`home scheduler` of
+ the task.
A multiprocessor computer system composed of dissimilar processors.
+ home scheduler
+ The home scheduler of a :term:`task` is a :term:`scheduler` which is a
+ :term:`eligible scheduler` and which is assigned to the task during the
+ initialization or explicitly via a directive call such as
A multiprocessor computer system composed of a single type of processor.
@@ -352,6 +367,10 @@ Glossary
A special low priority task which assumes control of the CPU when no
other task is able to execute.
+ ineligible scheduler
+ An ineligible scheduler of a :term:`task` is a :term:`scheduler` which is
+ not an :term:`eligible scheduler`.
A specification of the methodology used to connect multiple independent
@@ -724,6 +743,11 @@ Glossary
priority number and assign the tasks with the lowest priority number to
one processor of the set of processors owned by a scheduler instance.
+ A scheduler is either an :term:`eligible scheduler` or a
+ :term:`ineligible scheduler` for a task. An :term:`eligible scheduler` is
+ either the :term:`home scheduler` or a :term:`helping scheduler` for a
A scheduler instance is a scheduling algorithm with a corresponding
context to store its internal state. Each processor in the system is
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