Coroutines in Ruby

2005-02-12 9:13 AM
Ruby
Coroutines. 


  class Resumable
    def initialize(&proc)
      @inside = nil
      @outside = nil
      @proc = proc
    end

    def callable?; @inside.nil?; end
    def resumable?; [email protected]?; end
    alias :done? :callable?

    def call(*a)
      raise "not in callable state" unless callable?
      callcc do |c|
        @outside = c
        ret = @proc.call(self, *a)
        @inside = nil
        @outside.call(ret)
      end
    end

    def resume(*a)
      raise "not in a resumable state" unless resumable?
      callcc do |c|
        @outside = c
        @inside.call(*a)
      end
    end

    def suspend(*a)
      raise "not in a suspendable state" unless @outside
      callcc do |c|
        @inside = c
        @outside.call(*a)
      end
    end
  end

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