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Which of the following is the correct way to acquire a lock in a typical low-level design?

easy🧠 Conceptual Q12 of Q15
LLD - Design — Parking Lot System
Which of the following is the correct way to acquire a lock in a typical low-level design?
Alock.notify() before accessing shared data
Block.release() before accessing shared data
Clock.wait() after accessing shared data
Dlock.acquire() before accessing shared data
Step-by-Step Solution
Solution:

  1. Step 1: Understand lock usage order

    To safely access shared data, a thread must first acquire the lock to block others.

  2. Step 2: Correct method to acquire lock

    The method lock.acquire() is used to obtain the lock before accessing shared data.

  3. Final Answer:

    lock.acquire() before accessing shared data -> Option D

  4. Quick Check:

    Acquire lock first = A [OK]
Quick Trick: Acquire lock before shared data access [OK]
Common Mistakes:
MISTAKES
  • Releasing lock before access
  • Using wait or notify incorrectly
  • Confusing acquire with release

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