private class MyThread
	super Thread

	# This `ConcurrentArray` has its own `Mutex`
	var array: ConcurrentArray[String]

	# Use an explicit `Barrier`
	var barrier: Barrier

	var id: Int

	redef fun main
	do
		# Print and add to Array 1000 times
		for i in 1000.times do
			var str = "thread {id}: {i}"
			array.add str
		end

		# Wait at the `barrier`
		barrier.wait

		return id
	end
end