async.js

function runTasks(subtasks, callback) {
  function next() {
    var task = subtasks.shift();

    if (!task) {
      return callback();
    }

    task(function (err) {
      if (err) {
        return callback(err);
      }

      next();
    });
  }

  next();
}

var all = [];

[1,2].forEach(function () {
  all.push(function (next) {
    console.log('OPEN');
    setTimeout(function () {
      console.log('CLOSE');
      next();
    }, 2000);
  });
});

runTasks(all, function (err) {
  console.log("DONE'EM ALL");
});