Operating System (OS)
Semaphores

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

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Operating System (OS)
Virtual Memory

is a method of memory allocation by which the program is subdivided into equal portions, or pages and core is subdivided into equal portions or blocks.
None of these
allows multiple programs to reside in separate areas of core at the time.
is a method of allocating processor time.
consists of those addresses that may be generated by a processor during execution of a computation.

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Operating System (OS)
Scheduling is

not required in uniprocessor systems
allowing jobs to use the processor
unrelated to performance consideration
the same regard-less of the purpose of the system
None of these

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