Operating System (OS)
First-in-First-Out (FIFO) scheduling is

Deadline Scheduling
Fair Share Scheduling
Preemptive Scheduling
Non Preemptive Scheduling

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Operating System (OS)
A critical region is

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

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Operating System (OS)
Semaphores

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

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