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Limit on Zephyr mutex priority boost

In Zephyr, a cooperative thread waits on a k_mutex held by a preemptible thread. What limits how far the holder can be boosted?

A.Zephyr mutexes never boost the priority of the holderB.The holder is always boosted to priority -16 at onceC.CONFIG_PRIORITY_CEILING caps how far inheritance can raise itD.Only the idle thread is ever boosted by a mutex

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Limit on Zephyr mutex priority boost

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