Nodejs 消息队列与宏任务队列

Question

What is the difference between message queue and macrotask queue ? Is it the same thing?

On Nodejs documentation here it says:

When setTimeout() is called, the Browser or Node.js starts the timer. Once the timer expires, in this case immediately as we put 0 as the timeout, the callback function is put in the Message Queue.

While, in this section, it says:

A setTimeout, setImmediate callback is added to macrotask queue

So, does message queue and macrotask queue is the same thing?

Answer 1

It refers to the same thing here. One could say that " message queue " is a more general term, as in " the microtask queue and the macrotask queue are both message queues ".

Answer 2

If I am reading this right, it seems the "Message Queue" is a general term that is implemented using a few different queues.

In this section they explain:

A process.nextTick callback is added to process.nextTick queue. A Promise.then() callback is added to promises microtask queue. A setTimeout, setImmediate callback is added to macrotask queue.

Looks like the macrotask, microtask, etc. are specific parts of the implementation and have different attributes.

For example, execution order:

Event loop executes tasks in process.nextTick queue first, and then executes promises microtask queue, and then executes macrotask queue.

Found another easy explanation here .