Semaphore Atomic Operations List-I (Semaphore Command) A. wait(S) / P(S) B. signal(S) / V(S) C. Binary Semaphore D. Block Queue List-II (Atomic Code Action) Decrements count; blocks process if value becomes negative ( ) Increments count; wakes up a blocked process if queue is not empty Variable restricted strictly to values 0 and 1 List of PCBs suspended waiting for a resource to clear

A-1, B-2, C-3, D-4 Explanation: A. wait(S) / P(S) -> 1. Decrements count; blocks process if value becomes negative ( ) wait(S) ya P(S) operation semaphore ki value ko 1 se decrement karta hai. Agar value negative ( ) ho jati hai, to calling process block ho jata hai. B. signal(S) / V(S) -> 2. Increments count; wakes up a blocked process if queue is not empty signal(S) ya V(S) operation semaphore ki value ko 1 se increment karta hai. Agar waiting queue me koi blocked process hota hai, to ye use wake up karta hai. C. Binary Semaphore -> 3. Variable restricted strictly to values 0 and 1 Binary semaphore ek aisa variable hota hai jiski value sirf 0 ya 1 hi ho sakti hai. D. Block Queue -> 4. List of PCBs suspended waiting for a resource to clear Block queue un sabhi Processes (PCBs - Process Control Blocks) ki list hoti hai j

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CUET PG 2026 — operating system os PYQ

CUET PG | operating system os | 2026

Semaphore Atomic Operations

List-I (Semaphore Command)

A. wait(S) / P(S)

B. signal(S) / V(S)

C. Binary Semaphore

D. Block Queue

List-II (Atomic Code Action)

Decrements count; blocks process if value becomes negative ( $S < 0$ )
Increments count; wakes up a blocked process if queue is not empty
Variable restricted strictly to values 0 and 1
List of PCBs suspended waiting for a resource to clear

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