[Solved] Identify the error in this Ruby code that tries to use a Mutex:mutex = Mutex.new mutex.lock # critical section mutex.lock mutex.unlock | Ruby

Ruby - Concurrent Programming

Identify the error in this Ruby code that tries to use a Mutex:

mutex = Mutex.new
mutex.lock
# critical section
mutex.lock
mutex.unlock

AMutex cannot be locked manually.

BMutex.new is incorrect syntax.

CMissing synchronize block.

DCalling lock twice without unlock causes deadlock.

Step-by-Step Solution

Solution:

Step 1: Review mutex lock usage
Locking a mutex twice without unlocking causes the thread to wait forever (deadlock).
Step 2: Identify error in code
Code locks mutex twice in a row without unlocking in between, causing deadlock.
Final Answer:
Calling lock twice without unlock causes deadlock. -> Option D
Quick Check:
Double lock without unlock = deadlock [OK]

Quick Trick: Lock once before unlock to avoid deadlock [OK]

Common Mistakes:

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