Node.js + Python thread lock simulation

server.js

var net = require("net")
  , fs  = require("fs")
  , filename = "messages.txt";

var server = net.createServer(function(socket) {
	console.log("== Client connected");

	socket.on("data", function(data) {
		console.log("Client sent:", data.toString());
		socket.write("Your message has sent to the server!\n");

		fs.open(filename, "a+", 0666, function(err, fd) {
			fs.write(fd, data.toString(), null, undefined, function(err, written) {
  				fs.readFile(filename, function(err, data) {
  					console.log(data.toString());
  					socket.write(data.toString());

					socket.end();
  				});
			});
		});
	});

	socket.on("end", function() {
		console.log("== Client disconnected");
	});
}).listen(8888);

Fixed https://gist.github.com/2033582