A simple mutex library for node.js v0.3.1

Mutex.js

var EventEmitter = require('events').EventEmitter
var Mutex = function() {
       var queue = new EventEmitter();
       var locked = false;
       this.lock = function lock(fn) {
               if (locked) {
                       queue.once('ready',function() {
                               lock(fn);
                       });
               } else {
                       locked = true;
                       fn();
               }
       }
       this.release = function release() {
               locked = false;
               queue.emit('ready');
       }
}
exports.getMutex = function() {
       var m = new Mutex();
       return {
               lock: m.lock,
               release: m.release
       }
}