RSVP jquery ajax wrapper

ajax.js

function ajax(url, options) {
  return new Ember.RSVP.Promise(function (resolve, reject) {
    options = options || {};
    options.url = url;

    options.success = function (data) {
      Ember.run(null, resolve, data);
    };

    options.error = function () {
      Ember.run(null, reject, arguments);
    };

    Ember.$.ajax(options);
  });
}

@knownasilya what for used run ?