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node js async function and threads

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[前端(javascript) 所属分类 前端(javascript) | 发布者 店小二03 | 时间 2018 | 作者 红领巾 ] 0人收藏点击收藏

I have read some intro articles to nodejs and it seems like a fun way of creating webapps. However, i'm not sure if i understand the "only one thread" and "event loop" so i hope someone can clarify for me.

Lets say i have a function "computeBigNumbers(data, callback)". Now, when a http request is made i call this function and supply a callback for when it's done. In the "computeBigNumbers" function, if i don't specifically run the code in a child process or start a web worker thread, will it be async? I'm thinking no. Correct?

Problem courtesy of: Trj

Solution In the "computeBigNumbers" function, if i don't specifically run the code in a child process or start a web worker thread, will it be async?

... or call another async function.

But yes, there is only one thread in node.js , and it is your responsibility not to block it (by making time-consuming tasks explicitly asynchronous).

I/O lends itself to callbacks, but if you have a CPU-heavy operation, then you probably need to farm it out to a web worker or child process. An intense loop in javascript or a synchronous call into a C function will have the whole server wait for you.

Solution courtesy of: Thilo

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