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Basics of C async await. In this article, you'll learn what C async and C await keywords are and how to use async and await in C code. Nowadays, Asynchronous programming is very popular with the help of the async and await keywords in C. When we are dealing with UI, and on button click, we use a long-running method like reading a large file or something else which will take a long time, in that case, the entire application must wait to complete the whole task.
In other words, if any process is blocked in a synchronous application, the whole application gets blocked, and our application stops responding until the whole task completes. Asynchronous programming is very helpful in this condition. By using Asynchronous programming, the Application can continue with the other work that does not depend on the completion of the entire task. We will get all the benefits of traditional Asynchronous programming with much less effort with the help of async and await keywords.
Suppose we are using two methods as Method1 and Method2 respectively, and both the methods are not dependent on each other, and Method1 takes a long time to complete its task. In Synchronous programming, it will execute the first Method1 and it will wait for the completion of this method, and then it will execute Method2. Thus, it will be a time-intensive process even though both methods are not depending on each other. We can run all the methods parallelly by using simple thread programming, but it will block UI and wait to complete all the tasks.
To come out of this problem, we have to write too many codes in traditional programming, but if we use the async and await keywords, we will get the solutions in much less code. Also, we are going to see more examples, and if any third Method, as Method3 has a dependency of method1, then it will wait for the completion of Method1 with the help of await keyword.
Async and await in C are the code markers, which marks code positions from where the control should resume after a task completes. In the code given above, Method1 and Method2 are not dependent on each other and we are calling from the Main method. In this example, Method1 is returning the total length as an integer value and we are passing a parameter as a length in a Method3, which is coming from Method1.
Here, we have to use await keyword before passing a parameter in Method3 and for it, we have to use the async keyword from the calling method.
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