fibers.js

//fibers
function markComplete(postedItems, completionCallback) {
  var errors = [];
 
  var getItemToUpdate = function(item) {
    var savedTask;
    var fiber = Fiber.current;
    process.nextTick(function() {
      client.queryEntity('tasks', 'partition1', item, function(err, task) {
        savedTask=task;
        fiber.run();
      });
    });
    Fiber.yield();
    return savedTask;
  };
 
  Fiber(function() {
    postedItems.forEach(function(item) {
      task = getItemToUpdate(item);
      console.log(task);
    });
    completionCallback(undefined);
  }).run();
}