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____ enables context switching.

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____ enables context switching.

(a) Push/Pop of register stack

(b) ALU

(c) Bus

(d) Memory

This question was posed to me in a national level competition.

The question is from Digital Architecture Tradeoffs topic in portion Technology Tradeoffs in Software Defined Radio of Cognitive Radio

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The correct option is (a) Push/Pop of register stack

The explanation: An example of instruction set extension is rapid context switching. It is implemented using push/pop of register stack hardware. Hardware semaphore can be used for error-free sharing of resources.

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