Hi all,
I have a question regarding understanding mutex-design.rst. It is about
the feature that mutexes also have spinlocks for the case where the
current lock is occupied but by a task that is runnning and might end
soon (optimistic spinning).
The top of the file says:
In its most basic form it also includes a
wait-queue and a spinlock that serializes access to it. Furthermore,
CONFIG_MUTEX_SPIN_ON_OWNER=y systems use a spinner MCS lock (->osq), described
below in (ii).
What is not fully clear for me here is: is the optimistic spinning
always accessible and MCS is just an optimisation. Or is optimistic
spinning only accessible with CONFIG_MUTEX_SPIN_ON_OWNER.
The mentioning of the first spinlock in the first sentence confuses me.
Thanks,
-- Richard
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