[Solved] In the following code snippet, what is the main concurrency issue? lock.acquire() shared_data.append(1) # Missing lock.release() | LLD

LLD - Design — Parking Lot System

In the following code snippet, what is the main concurrency issue?

lock.acquire()
shared_data.append(1)
# Missing lock.release()

ADeadlock due to missing lock release

BData race on shared_data

CSyntax error in lock usage

DNo issue, code is safe

Step-by-Step Solution

Solution:

Step 1: Identify missing lock release
The code acquires a lock but never releases it, so other threads waiting for the lock will block forever.
Step 2: Understand deadlock impact
This causes a deadlock where threads cannot proceed, halting system progress.
Final Answer:
Deadlock due to missing lock release -> Option A
Quick Check:
Missing release causes deadlock = A [OK]

Quick Trick: Always release locks after acquiring [OK]

Common Mistakes:

MISTAKES

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In the following code snippet, what is the main concurrency issue?