async thin (or em'ed rainbows)

async thin:
~> ab -n 100 -c 10 http://127.0.0.1:9292/
Concurrency Level: 10
Time taken for tests: 10.939 seconds
Complete requests: 100

use ContentType
run lambda{ |env|
  Thread.new{
    sleep(1)
    env['async.callback'].call [200, {}, ["OK\n\n"]]
  }
  throw :async

  # sleep(1)
  # [200, {}, ["OK\n\n"]]
}

sync thin:
~> ab -n 100 -c 10 http://127.0.0.1:9292/
Concurrency Level: 10
Time taken for tests: 100.295 seconds
Complete requests: 100

use ContentType
run lambda{ |env|
  # Thread.new{
  #   sleep(1)
  #   env['async.callback'].call [200, {}, ["OK\n\n"]]
  # }
  # throw :async

  sleep(1)
  [200, {}, ["OK\n\n"]]
}