[Solved] Given this Ruby code, what is the expected output considering the GIL?require 'thread' mutex = Mutex.new count = 0 threads = [] 5.times do threads | Ruby

Ruby - Concurrent Programming

Given this Ruby code, what is the expected output considering the GIL?

require 'thread'
mutex = Mutex.new
count = 0
threads = []
5.times do
  threads << Thread.new do
    1000.times do
      mutex.synchronize { count += 1 }
    end
  end
end
threads.each(&:join)
puts count

ALess than 5000 due to race conditions

BAn error because Mutex is not used correctly

C0

D5000

Step-by-Step Solution

Solution:

Step 1: Identify mutex usage
The code uses a Mutex to synchronize increments, preventing race conditions.
Step 2: Understand GIL and mutex combined effect
Mutex ensures only one thread updates count at a time, so all increments are counted correctly.
Final Answer:
5000 -> Option D
Quick Check:
Mutex + GIL = correct count [OK]

Quick Trick: Use Mutex to avoid race conditions despite GIL [OK]

Common Mistakes:

Ignoring mutex and expecting race conditions
Thinking GIL alone prevents race conditions
Assuming code raises an error

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Given this Ruby code, what is the expected output considering the GIL?

Step 1: Identify mutex usage

Step 2: Understand GIL and mutex combined effect

Final Answer:

Quick Check:

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