[zhong-j-yu]

I use the word from the programmer's point of view; it's irrelevant how things are done under the hood.

For example, in Go, when you read a value from a channel, it's just like a good old blocking call, as far as the programmer is concerned.

On the other hand, an "async" read would involve callback, promise, or some other constructs.

[kaoD]

Promises are also like good old blocking calls. How is a channel different?