async-workers.js

var workers = [
  {name: 'worker1', fn: function(task, cb) {/* some async processing */}},
  {name: 'worker2', fn: function(task, cb) {/* some async processing */ }}
];

var tasks = ['one']; // this will be filled with a first task and then filled with more tasks from the workers

// I want to distribute tasks to workers, each worker can process only one task at a time
// workers will add more tasks while processing
// in some situations tasks may be empty and all workers processing
// in some situations tasks will not be empty and all workers will be processing
// When there's one error, I just want to be notified

// Any module can be used, I am using Node.JS latest