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c-user: Add scheduler glossary terms

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Add glossary terms which characterize the relationship of a scheduler to
a task.
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Sebastian Huber 2021-04-12 11:28:56 +02:00
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c-user/glossary.rst
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@ -240,6 +240,10 @@ Glossary
This term is an acronym for This term is an acronym for
`Executable and Linkable Format <https://en.wikipedia.org/wiki/Executable_and_Linkable_Format>`_. `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.
embedded embedded
An application that is delivered as a hidden part of a larger system. 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 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 dispatch is marked as necessary, then the next thread dispatch will make
the heir task the executing task. 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.
heterogeneous heterogeneous
A multiprocessor computer system composed of dissimilar processors. 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
:c:func:`rtems_task_set_scheduler`.
homogeneous homogeneous
A multiprocessor computer system composed of a single type of processor. 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 A special low priority task which assumes control of the CPU when no
other task is able to execute. 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`.
interface interface
A specification of the methodology used to connect multiple independent A specification of the methodology used to connect multiple independent
subsystems. subsystems.
@ -724,6 +743,11 @@ Glossary
priority number and assign the tasks with the lowest priority number to priority number and assign the tasks with the lowest priority number to
one processor of the set of processors owned by a scheduler instance. 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
task.
scheduler instance scheduler instance
A scheduler instance is a scheduling algorithm with a corresponding A scheduler instance is a scheduling algorithm with a corresponding
context to store its internal state. Each processor in the system is context to store its internal state. Each processor in the system is