further Workers

queue.nonrandom.js

//if your workers are in an array called workers
//and your data in one called data
//this assumes wokers return promises
//that is not the case but it simplifies stuff here
//it's based on stuff from my library catiline where
//workers DO return promises.

var numIdle = workers.length;
var idle = [];
var queueLen = data.length;
var i = -1;
while(++i<numIdle){
  idle[i]=i;
}
function done(num) {
  	var data;
		if (queueLen) {
			datum = data.shift();
			queueLen--;
			workers[num].postMessage(datum).then(function (d) {
				done(num);
			}, function (d) {
				done(num);
			});
		}
		else {
			numIdle++;
			idle.push(num);
		}
	}
function addData(datum){
  if (!queueLen && numIdle) {
	num = idle.pop();
	numIdle--;
		workers[num].postMessage(datum).then(function (d) {
				done(num);
			}, function (d) {
				done(num);
			});
		}
		else if (queueLen || !numIdle) {
			queueLen = data.push(data);
		}
}
var num,item;
while(numIdle&&queueLen){
  num = idle.pop();
  numIdle--;
  item = data.unshift();
  queueLen--;
  workers[num].postMessage(item).then(function(d){
    done(num);
  });
}