Operating System (OS)
A critical region is

none is the above
a program segment that often causes unexpected system crashes
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

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Operating System (OS)
What is dispatch latency ?

The whole time taken by all processor
None of the listed here
The time taken by the processor to write a file into disk
The time taken by the dispatcher to stop one process and start another

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Operating System (OS)
Addressing modes

All of these
defines the fundamental method of determining effective operand addresses
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.
None of these
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.

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