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manual_lock_unlock

🤝 Manually Lock and Unlock​

While synchronize is concise, you can manually call lock and unlock for more control. Always use an ensure block to guarantee the mutex is released, even if an exception is raised.

require 'thread'

mutex = Mutex.new

def safe_update(mutex)
  mutex.lock
  begin
    # critical code here
    puts "Working in thread #{Thread.current.object_id}"
  ensure
    mutex.unlock
  end
end

threads = 3.times.map { Thread.new { safe_update(mutex) } }
threads.each(&:join)