Operating System (OS)
Feed back queue

are used to favor real-time tasks
are very easy to implement
None of these
dispatch tasks according to execution characteristics
require manual intervention to implement properly

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Operating System (OS)
A critical region is

a program segment that has not been proved bug-free
a program segment where shared resources are accessed
one which is enclosed by a pair of P and V operations on semaphores
a program segment that often causes unexpected system crashes
none is the above

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