hanachin · July 3, 2020 05:43
diff --git a/1.rb b/1.rb
 def f
  sleep 1
 end

 BEGIN {
  using Module.new {
    refine(Kernel) do
      def sleep *; end
    end
  }
 }

 100.times { f }
diff --git a/2.rb b/2.rb
 def f
  sleep 1
 end

 100.times.map { Thread.new { f } }.each(&:join)
diff --git a/3.rb b/3.rb
 def f
  sleep 1
 end

 100.times.map { fork { f } }.compact.each { Process.waitpid(_1) }
	def f
	sleep 1
	end

	100.times.map { Thread.new { f } }.each(&:join)
	def f
	sleep 1
	end

	100.times.map { fork { f } }.compact.each { Process.waitpid(_1) }