[Solved] Find the problem in this Ruby code snippet:mutex = Mutex.new threads = 2.times.map do Thread.new do mutex.synchronize do puts 'Start' sleep 1 puts 'End' end end end threads.each(&:join) | Ruby

Ruby - Concurrent Programming

Find the problem in this Ruby code snippet:

mutex = Mutex.new
threads = 2.times.map do
  Thread.new do
    mutex.synchronize do
      puts 'Start'
      sleep 1
      puts 'End'
    end
  end
end
threads.each(&:join)

AThe code will print 'Start' and 'End' messages sequentially, blocking threads.

BMutex is not used correctly; it should be locked manually.

CThreads will run in parallel without waiting.

DThe sleep call causes a syntax error.

Step-by-Step Solution

Solution:

Step 1: Understand mutex synchronize behavior
Synchronize locks mutex for entire block, so only one thread runs it at a time.
Step 2: Analyze output order
Threads print 'Start', sleep 1 second, then 'End' sequentially, blocking each other.
Final Answer:
The code will print 'Start' and 'End' messages sequentially, blocking threads. -> Option A
Quick Check:
Mutex synchronize blocks threads sequentially [OK]

Quick Trick: Mutex synchronize blocks threads one at a time [OK]

Common Mistakes:

Expecting parallel prints
Thinking manual lock needed with synchronize
Assuming sleep causes error

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More Ruby Quizzes

Find the problem in this Ruby code snippet:

Step 1: Understand mutex synchronize behavior

Step 2: Analyze output order

Final Answer:

Quick Check:

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