ツナでもわかるmruby [6回目：コルーチン・非同期I/O] ref: http://qiita.com/hiroeorz@github/items/68acf89b768475af6e2c

build_config.rb

MRuby::Build.new do |conf|
  ...
  conf.gem :github => 'mattn/mruby-uv' #追加
  ...
end

fiber-sample.rb

fiber = Fiber.new{         # ①Fiber生成
  counter = 0              # ②counter変数を初期化

  loop do
    puts "top of loop"
    Fiber.yield(counter)   # ③コンテキストを親へ戻す ⑦コンテキストを親へ戻す
    counter += 1           # ⑥counter変数に1を足す
  end
}
                           # ④コンテキストが子から戻る
5.times do
  count = fiber.resume     # ⑤コンテキストを子へ切り替える
                           # ⑧コンテキストが子から戻り、返り値をcount変数に代入
  p count                  # ⑨子から受け取った値を表示
end

fiber-sample2.rb

fiber = Fiber.new{    # ①Fiber生成
  counter = 0         # ②counter初期化

  loop do
    name, arg = Fiber.yield(counter) # ③親へコンテキストを移す
                                     # ⑥name,argと共に子へコンテキストが移る
    puts "called: #{name}(#{arg})"

    case name         # ⑦受け取ったnameによって処理を切り替える
    when :+           # ⑧nameが:+の場合counterにargを足す
      counter += arg
    when :-           # ⑨nameが:-の場合counterからargを引く
      counter -= arg
    when :clear       # ⑩nameが:clearの場合はcounterを0で初期化
      counter = 0
    end
  end
}

fiber.resume      # ④一回ループを回しておく

5.times do
  count = fiber.resume([:+, 2]) # ⑤counterに2を足す
                                # ⑪結果をcount変数に代入
  p count

  count = fiber.resume([:-, 1]) # ⑫counterから1を引く
  p count
end

count = fiber.resume(:clear)
p count

file1.txt

mruby fiber-sample.rb

top of loop
0
top of loop
1
top of loop
2
top of loop
3
top of loop
4

file11.txt

$ mruby tcp-server.rb

bound to 0.0.0.0:6789

file12.txt

$ mruby tcp-client.rb
hello world

file14.txt

$ mruby tcp-server-client.rb

bound to 0.0.0.0:16789
hello world
hello world
hello world
hello world
hello world
hello world
...

file3.txt

$ mruby fiber-sample2.rb

called: +(2)
2
called: -(1)
1
called: +(2)
3
called: -(1)
2
called: +(2)
4
called: -(1)
3
called: +(2)
5
called: -(1)
4
called: +(2)
6
called: -(1)
5
called: clear()
0

file5.txt

$ brew install libtool
$ brew install automake

file6.txt

$ rake
$ sudo cp ./bin/* /usr/local/mruby/bin/

file8.txt

$ mruby tcp-server.rb

bound to 0.0.0.0:6789

file9.txt

$ telnet localhost 6789

Trying 127.0.0.1...
Connected to localhost.
hello world
Connection closed by foreign host.

tcp-client.rb

client = UV::TCP.new

client.connect(UV.ip4_addr("127.0.0.1", 6789)) {|x|
  if x == 0
   client.read_start { |b|
     puts b.to_s
   }
  else
    client.close
  end
}

UV::run()

tcp-server-client.rb

# サーバー
server = UV::TCP.new
server.bind(UV::ip4_addr("0.0.0.0", 16789))
puts "bound to #{server.getsockname}"

server.listen(5) { |x|
  return if x != 0
  c = server.accept;

  timer = UV::Timer.new # サーバーから一定間隔でデータを送るためのタイマー
  timer.start(1000, 1000) { |x|
    begin
      c.write "hello world\r\n"
    rescue UVError
      c.close
      timer.stop
      c = timer = nil
    end
  }
}

# クライアント
client = UV::TCP.new

client.connect(UV.ip4_addr("127.0.0.1", 16789)) {|x|
  if x == 0
   client.read_start { |b|
     puts b.to_s
   }
  else
    client.close
  end
}

UV::run()

tcp-server.rb

s = UV::TCP.new
s.bind(UV::ip4_addr("0.0.0.0", 6789))
puts "bound to #{s.getsockname}"

s.listen(5) {|x|
  return if x != 0
  c = s.accept;
  c.write "hello world\r\n"
  c.close
}

UV::run()