Software Solutions (Historical) List-I (Software Attempt) A. Strict Alternation B. Lock Variable Flag C. Peterson's Solution D. Dekker's Algorithm List-II (Failure or Property Mode) Satisfies mutual exclusion but fails the progress requirement Fails mutual exclusion if both read the flag as 0 simultaneously Classic, correct two-process solution using turn and flag variables First correct software solution for mutual exclusion between two processes

A-1, B-2, C-3, D-4 Explanation: A. Strict Alternation -> 1. Satisfies mutual exclusion but fails the progress requirement Strict Alternation (turn variable method) mutual exclusion ko satisfy karta hai, lekin progress requirement me fail ho jata hai kyunki processes ko alternate turn lene ke liye force karta hai. B. Lock Variable Flag -> 2. Fails mutual exclusion if both read the flag as 0 simultaneously Lock variable method me agar dono processes ek sath lock/flag ko 0 read kar lein, to dono ek sath critical section me enter kar jate hain, jisse mutual exclusion fail ho jata hai. C. Peterson's Solution -> 3. Classic, correct two-process solution using turn and flag variables Peterson's solution ek classic aur correct two-process solution hai jo turn aur flag variables dono ka use karta hai. D. Dekker's Algorithm -> 4. F

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CUET PG 2026 — operating system os PYQ

CUET PG | operating system os | 2026

Software Solutions (Historical)

List-I (Software Attempt)

A. Strict Alternation

B. Lock Variable Flag

C. Peterson's Solution

D. Dekker's Algorithm

List-II (Failure or Property Mode)

Satisfies mutual exclusion but fails the progress requirement
Fails mutual exclusion if both read the flag as 0 simultaneously
Classic, correct two-process solution using turn and flag variables
First correct software solution for mutual exclusion between two processes

Choose the correct answer: