How can I notify awaiting Task from another thread to complete?

Question

Consider following pseudocode:

Thread #1

var task = new Task<int>();
this.AwaitingTask = task;
return await task;

Thread #2

this.AwaitingTask.Complete(16);

This way, #2 thread would pass return value (int) and notify that Task is completed. So the #1 thread would know to continue execution.

Is it possible to implement? And how? I'm looking for closest idea that would work in similiar way.

Answer 1

You don't have to implement it. It is already shipped with name TaskCompletionSource<T>

Thread 1

var completionSource = new TaskCompletionSource<int>();
this.CompletionSource= completionSource;
return await completionSource.Task;

Thread 2

this.CompletionSource.SetResult(16);