JavaScript 生产者消费者模型

因为node使用单线程的方式实现，所以，在此使用定时器timer取代线程thread来实现生产者消费者模型。

var sigintCount = 0;
var productArray = [];
var productArrayLen = 0;
var productLock = false;
var PRODUCT_ARRAY_THRESHOLD = 10;

var sleep = function () {
    clearInterval(producerTimer);
    clearInterval(consumerTimer);
    console.log('Production has been completed and the productArrayLen is:' + productArrayLen);
    console.log('Thank you for use, Bye bye ~');
}

var producerTimer = setInterval(function () {
    if(!productLock) {
        if(!productLock) {
            productLock = true;
            if(productArrayLen < PRODUCT_ARRAY_THRESHOLD) {
                productArrayLen ++;
                productArray.push('product');
                console.log('product:' + productArrayLen + '    producer.push');
            }
            else{
                // 达到生产目标，休眠线程
                sleep();
            }
            productLock = false;
        }
    }
}, 500);


var consumerTimer = setInterval(function() {
    if(!productLock) {
        if(!productLock) {
            productLock = true;
            if(productArrayLen > 0) {
                var product = productArray.shift();
                productArrayLen --;
                console.log('product:' + productArrayLen + '    producer.pop');
            }
            else{
                console.log('product:' + productArrayLen + '    producer.idle');
            }
            productLock = false;
        }
    }
}, 1000);