Operating System (OS)
Semaphores

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

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Operating System (OS)
Addressing structure

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

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