Hardware Instruction Support List-I (Hardware Atomicity) A. TestAndSet B. CompareAndSwap C. Memory Barrier D. Atomic Variable List-II (Execution Mechanism) Reads a variable, sets it to true, and returns the old value atomically Swaps value only if current matches an expected target value Forces the system to complete pending memory actions before moving on High-speed hardware wrapper for single-variable math counters

A-1, B-2, C-3, D-4 Explanation: A. TestAndSet -> 1. Reads a variable, sets it to true, and returns the old value atomically TestAndSet instruction atomically memory location ko read karti hai, use true (1) set karti hai, aur uski old value return karti hai. B. CompareAndSwap -> 2. Swaps value only if current matches an expected target value CompareAndSwap (CAS) tabhi value ko new value se swap/replace karta hai jab current value expected target value ke barabar match karti hai. C. Memory Barrier -> 3. Forces the system to complete pending memory actions before moving on Memory Barrier (ya Fence instruction) system ko force karti hai ki aage badhne se pehle sare pending read/write memory operations complete kar liye jayein. D. Atomic Variable -> 4. High-speed hardware wrapper for single-variable math counters Atomic Varia

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CUET PG 2026 — operating system os PYQ

CUET PG | operating system os | 2026

Hardware Instruction Support

List-I (Hardware Atomicity)

A. TestAndSet

B. CompareAndSwap

C. Memory Barrier

D. Atomic Variable

List-II (Execution Mechanism)

Reads a variable, sets it to true, and returns the old value atomically
Swaps value only if current matches an expected target value
Forces the system to complete pending memory actions before moving on
High-speed hardware wrapper for single-variable math counters

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