CODEWITHSUNDEEP
processoperating-systemcontext-switch
Prashant Bhardwaj
Prashant Bhardwaj

Reputation: 1213

Which of the following involves context switch?

Which of the following involves context switch?

A. System Call

B. Privileged Instruction

C. Both A & B

D. None Of These

Upvotes: 1

Views: 3441

Answers (2)

Ezequiel Muns
Ezequiel Muns

Reputation: 7762

D. None of these

A system call involves a mode switch (user mode to kernel mode) but does not necessarily mean a context switch (this depends on OS): http://en.wikipedia.org/wiki/Context_switch

Since A isn't true, D is the only remaining option

(My intuition would tell me that a privileged instruction would require you to already be in kernel mode)

Upvotes: 1

Alok Save
Alok Save

Reputation: 206636

Both A and B.

When a system call is executed a context switch between user space to kernel space has to take place.

When a priority task is executed the thread or process context needs to switch to perform the priority task by switching from the task that was currently being executed.

Upvotes: 0

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