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It is the main thread

t1 = Thread.new { sleep 100 } t2 = Thread.new do   if Thread.current == Thread.main     puts "This is the main thread."   # Does NOT print   end   1.upto(1000)     sleep 0.1    end count = Thread.list.size              # 3 if Thread.list.include?(Thread.main)   puts "Main thread is alive."        # Always prints! end if Thread.current == Thread.main   puts "I'm the main thread."         # Prints here... end