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doc: kernel: threads: fix idle thread priority documentation

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Clarify that the idle thread has priority CONFIG_NUM_PREEMPT_PRIORITIES,
not (CONFIG_NUM_PREEMPT_PRIORITIES - 1).

The idle thread priority ranges from 0 to 127 and never has a cooperative
thread priority.

Signed-off-by: Jonas Spinner <jonas.spinner@burkert.com>
This commit is contained in:
Jonas Spinner 2025-02-07 09:55:43 +01:00 • committed by Benjamin Cabé
commit b9ee6af4fe
2 changed files with 2 additions and 5 deletions
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doc/kernel/services/threads/system_threads.rst
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@ -35,9 +35,6 @@ The kernel spawns the following system threads:
and never terminates.
The idle thread always uses the lowest configured thread priority.
If this makes it a cooperative thread, the idle thread repeatedly
yields the CPU to allow the application's other threads to run when
they need to.
The idle thread is an essential thread, which means a fatal system error
is raised if the thread aborts.