[Solved] In this code snippet, what is the main error?lock.acquire() if shared_var == 0: shared_var = 1 lock.release() | LLD

LLD - Advanced LLD Concepts

In this code snippet, what is the main error?

lock.acquire()
if shared_var == 0:
    shared_var = 1
lock.release()

ALock is not released if an exception occurs

BLock is released before modifying shared_var

CLock is not acquired before checking shared_var

DLock is held during the entire check and update, which is correct

Step-by-Step Solution

Solution:

Step 1: Review lock usage
Lock is acquired and released properly in normal flow.
Step 2: Consider exceptions
If an exception occurs between acquire and release, lock may never release.
Final Answer:
Lock is not released if an exception occurs -> Option A
Quick Check:
Exception safety = release lock properly [OK]

Quick Trick: Use try-finally to always release locks [OK]

Common Mistakes:

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