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Which of the following does not uses a shared memory?

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Which of the following does not uses a shared memory?

(a) process

(b) thread

(c) task

(d) kernel

The question was asked by my school principal while I was bunking the class.

This question is from Tasks,Threads and Process topic in chapter Real Time Operating systems of Embedded Systems

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The correct option is (a) process

The explanation is: The program in execution is known as the process. The process does not share the memory space but the threads have a shared memory address. When the CPU switches from process to another, the current information is stored in the process descriptor.

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