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c#multithreadingasynchronousasync-await
jack_jay
jack_jay

Reputation: 21

Is async await create a thread in C#?

Both Thread.Sleep() and Task.Delay() can suspend the execution of a program (thread) for a given timespan. But are there actually suspending the execution? What is the difference? Hopefully some one can trying to answer all the questions above.

Upvotes: 0

Views: 140

Answers (1)

Stephen Cleary
Stephen Cleary

Reputation: 456322

Thread.Sleep is a blocking call. It puts the current thread into a wait state until the timeout period elapses. So yes, Thread.Sleep does suspend the current thread.

Task.Delay also uses a timer, but it does not block. Instead, it returns a Task that completes when that timer fires. So it does not suspend the current thread.

Task.Delay is commonly used with await, which will suspend the current method (not thread). The thread returns from that method and continues executing.

So, Thread.Sleep suspends the current thread (and the method it's executing), but await Task.Delay will suspend the current method without suspending the current thread.

Upvotes: 3

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