"Producer-Consumer" example implementation using generators. See http://en.wikipedia.org/wiki/Deterministic_concurrency#Comparison_with_generators for more about coroutine

producer-consumer.js

/* jshint esnext:true */

/**
 * "Producer-Consumer" implementation using generators.
 * @see http://en.wikipedia.org/wiki/Deterministic_concurrency#Comparison_with_generators
 */

var SIZE = 3,
    queue = newQueue();

function *produce() {
    while(true) {
        log('going to produce items');

        var item, i;
        for(i = 0; i < SIZE; i++) {
            log('producing item', i);
            item = 'item' + i;
            queue[i] = item;
        }
        log(i, 'items produced');

        yield consume;
    }
}

function *consume() {
    while(true) {
        log('going to consume items');

        var item, i;
        for(i = 0; i < SIZE; i++) {
            log('remove item', i, 'from queue');
            item = queue[i];
        }
        flush();

        yield produce;
    }
}

function dispatcher(n) {
    (n > 0) || (n = 1);

    var map = new WeakMap();
    map.set(consume, consume());
    map.set(produce, produce());

    var current = produce,
        i = 0;

    do {
        current = map.get(current).next().value;
    } while(++i < n*2);
}


function log() {
    console.log.apply(console, arguments);
}

function newQueue() {
    return new Array(SIZE);
}

function flush() {
    var data = queue;
    queue = newQueue();
    return data;
}

dispatcher();