On 15/09/2021 17:22, Gedare Bloom wrote:
priority
The priority is a mechanism used to represent the relative importance
of an
- element in a set of items. RTEMS uses :term:`task priorities <task
priority>` to determine
- which :term:`task` should execute.
+ element in a set of items.
+
+ For example, :term:`RTEMS` uses :term:`task priorities <task
priority>` to determine which
+ :term:`task` should execute on a processor. In RTEMS, priorities are
+ represented by non-negative integers.
+
+ For the Classic :term:`API`, if a numerical priority value ``A`` is
greater
+ than a numerical priority value ``B``, then ``A`` expresses a
+ :term:`higher priority` than ``B``. If a numerical priority value
``C`` is
+ less than a numerical priority value ``D``, then ``C`` expresses a
+ :term:`lower priority` than ``D``.
+
+ For the :term:`POSIX` API, if a numerical priority value ``R`` is less
than
+ a numerical priority value ``S``, then ``R`` expresses a lower
priority than
+ ``S``. If a numerical priority value ``T`` is greater than a numerical
+ priority value ``U``, then ``T`` expresses a higher priority than
``U``.
These are backwards. Classic priorities with numerically greater
values indicate lower priorities. POSIX priorities with numerically
higher values express higher priorities.
Thanks for noticing this. I swapped the lower and higher priority items:
https://git.rtems.org/rtems-central/commit/?id=4cd035ab1160394172d2669dd2ac22668b365991
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