A simple mutex library for node.js

mutex.js

var EventEmitter = require('events').EventEmitter;

module.exports = 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');
  };
};

nice, will work for single process, but not multiple processes right? this.lock is global...?