[Understanding with pictures] The most intuitive understanding of the concepts of sync and async

Hello! This is Alan.

I made a short lecture, but I don't know if it was helpful! However, many people left good reviews saying it was helpful, so I feel like it was a good idea to make the class. ^^

It's nothing else, other than the occasional synchronous and asynchronous concept,

What is the concept of Blocking/Non-Blocking ? These kinds of questions have been coming up.. If there is anyone who might be interested, I am leaving the content here in case it will be helpful.

I think it is a priority to first learn the synchronous/asynchronous concepts that I talked about in class. Since some languages do not use the Blocking/Non-Blocking concepts, I think you should first check if these concepts exist in the language you are studying. ^^

Yes, if you are using a language that uses the Blocking/Non-Blocking concept, I recommend that you refer to the content below.

▶︎ Blocking / Non-Blocking is an important concept in whether the called function returns immediately or not.

1) Blocking - does not return immediately (blocks work from being done)

2) Non-Blocking - returns immediately



▶︎ Synchronous/asynchronous : Whether the calling function or the called function (callback) cares about whether the task is completed

1) Motivation - the calling function cares about completing its work

2) Asynchronous - the called function (callback function) cares about the completion of the task.

(However, it is said that this concept of combining Blocking & Async is not used intentionally because it does not allow other tasks to be done anyway .)



And in languages where the concept of Blocking/Non-Blocking is not generally used, as I said in class,

It is convenient to think of synchronous as a concept combined with Blocking , and asynchronous as a concept combined with Non-Blocking .

And if there is any other material that someone else has written very well, I will also attach a link. ^^

https://homoefficio.github.io/2017/02/19/Blocking-NonBlocking-Synchronous-Asynchronous/

https://siyoon210.tistory.com/147

Thank you. :)