Operating System (OS)
A critical region is

none is the above
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 has not been proved bug-free
a program segment that often causes unexpected system crashes

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Operating System (OS)
System generation:

is always very difficult
requires extensive tools to be understandable
varies in difficulty between systems
None of these
is always quite simple

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Operating System (OS)
Semaphores

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

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