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。
1 var sigintCount = 0;
2 var productArray = [];
3 var productArrayLen = 0;
4 var productLock = false;
5 var PRODUCT_ARRAY_THRESHOLD = 10;
6
7 var sleep = function () {
8 clearInterval(producerTimer);
9 clearInterval(consumerTimer);
10 console.log('Production has been completed and the productArrayLen is:' + productArrayLen);
11 console.log('Thank you for use, Bye bye ~');
12 }
13
14 var producerTimer = setInterval(function () {
15 if(!productLock) {
16 if(!productLock) {
17 productLock = true;
18 if(productArrayLen < PRODUCT_ARRAY_THRESHOLD) {
19 productArrayLen ++;
20 productArray.push('product');
21 console.log('product:' + productArrayLen + ' producer.push');
22 }
23 else{
24 // 达到生产目标，休眠线程
25 sleep();
26 }
27 productLock = false;
28 }
29 }
30 }, 500);
31
32
33 var consumerTimer = setInterval(function() {
34 if(!productLock) {
35 if(!productLock) {
36 productLock = true;
37 if(productArrayLen > 0) {
38 var product = productArray.shift();
39 productArrayLen --;
40 console.log('product:' + productArrayLen + ' producer.pop');
41 }
42 else{
43 console.log('product:' + productArrayLen + ' producer.idle');
44 }
45 productLock = false;
46 }
47 }
48 }, 1000);
