Operating System (OS)
Which of the following is not a characteristic of a daisy chaining priority control scheme?

priority is programmable
the failure of one device may affect other devices on the chain
it is relatively easy to add more devices to the chain
the number of control lines is independent of the number of devices on the chain
None of these

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Operating System (OS)
Semaphores

synchronize critical resources to prevent deadlock
synchronize critical resources to prevent contention
are used for memory management
None of these
are used to do I/O

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