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Asynchronous programming with Tornado

Asynchronous programming can be tricky for beginners, therefore I think it's useful to iron some basic concepts to avoid common pitfalls.

For an explanation about generic asynchronous programming, I recommend you one of the [many][2] [resources][3] [online][4].

I will focus on solely on asynchronous programming in [Tornado][1]. From Tornado's homepage:

访问WR703N在OpenWrt的[Wiki页][wr703n-openwrt]，然后在Flashing一节中找到下载链接：[squashfs-factory.bin][flash.bin]，下载后别忘了[比对md5][md5sum]。^[1]

进入路由器管理界面，出厂配置为http://192.168.1.1，用户名和密码均为admin，然后进入固件更新，选择下载的文件，然后更新。

	import Foundation
	import objc
	import AppKit
	import sys

	NSUserNotification = objc.lookUpClass('NSUserNotification')
	NSUserNotificationCenter = objc.lookUpClass('NSUserNotificationCenter')

	def notify(title, subtitle, info_text, delay=0, sound=False, userInfo={}):
	notification = NSUserNotification.alloc().init()

	from time import sleep
	from tornado.httpserver import HTTPServer
	from tornado.ioloop import IOLoop
	from tornado.web import Application, asynchronous, RequestHandler
	from multiprocessing.pool import ThreadPool

	_workers = ThreadPool(10)

	def run_background(func, callback, args=(), kwds={}):
	def _callback(result):

	class Application(tornado.web.Application):
	def __init__(self):
	tornado.web.Application.__init__(self, handlers, **settings)
	self.db_session = db_session
	self.redis = redis.StrictRedis()
	self.session_store = RedisSessionStore(self.redis)



	class BaseHandler(tornado.web.RequestHandler):

	from flask import Flask

	app=Flask(__name__)

	@app.route('/')
	def index():
	return """
	<span id="now">loading<span>
	<script type="text/javascript">
	window.WebSocket=window.WebSocket \|\| window.MozWebSocket \|\| false;

	(env)~/env pip install pycurl
	Downloading/unpacking pycurl
	Downloading pycurl-7.19.0.tar.gz (71Kb): 71Kb downloaded
	Running setup.py egg_info for package pycurl
	sh: curl-config: not found
	Traceback (most recent call last):
	File "<string>", line 14, in <module>
	File "/home/eric/env/build/pycurl/setup.py", line 90, in <module>
	raise Exception, ("`%s' not found -- please install the libcurl development files" % CURL_CONFIG)
	Exception: `curl-config' not found -- please install the libcurl development files


	from flask import Flask, request, session, url_for, redirect, \
	render_template, abort, g, flash
	from werkzeug.contrib.sessions import Session, SessionStore
	from cPickle import HIGHEST_PROTOCOL
	from random import random
	from flask import json
	class MemcachedSessionStore(SessionStore):

	def __init__(self, servers=None, key_prefix=None, default_timeout=300):

	A warning occurred (42 apples)
	An error occurred