Concurrency vs Multi-threading vs Asynchronous Programming : Explained

Recently, I was speaking in an event and I asked a question to the audience in between my talk about Asynchronous programming , I found that some of the people were confused between multi-threading and asynchronous programming and some were saying that both are same. So I thought of explaining these terms and add one more term Concurrency. Here there are two concepts involved and both are completely different, First – Synchronous and  Asynchronous programming and second – Single threaded and multi-threaded applications. Each programming model (Synchronous and Asynchronous ) can run in single threaded and multi-threaded environment. Let’s discuss these in detail.

Synchronous Programming model – In this programming model, when a thread assigned to one task and start executing. Then completes the executing task then able to take up another task. In this model, it can not leave the executing task in between to take up some another task. Lte’s discuss how this model works in single and multi-threaded scenario.

Single Threaded – If we have couple of tasks to be worked on and the current system provides a single thread which can work all those, then it takes one by one and process as

singlethreadedHere we can see that we have a thread (Thread 1 ) and four tasks to be completed. Thread starts processing one by one and completes all. (The order in which tasks will be taken up, does not affect the execution, we can have different algorithm which can define the priorities of tasks)

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