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What Thread Executes Code After an `await` Keyword in a Multi-Threaded Application?
What Thread Executes Code After an `await` Keyword in a Multi-Threaded Application?
Dec 30, 2024 pm 10:48 PM
Unraveling the Mystery of Threaded Execution After 'Await'
In a multi-threaded application, understanding the flow of execution is crucial. When encountering the enigmatic 'await' keyword, developers often grapple with the question: "Which thread orchestrates the resumption of code after the 'await'?"
Consider the following code snippet:
private void MyMethod()
{
Task task = MyAsyncMethod();
task.Wait();
}
private async Task MyAsyncMethod()
{
//Code before await
await MyOtherAsyncMethod();
//Code after await
}
Assuming this code operates within a single-threaded application, it becomes perplexing: how can the code after the 'await' keyword execute if the thread is locked by 'task.Wait()'?
The answer lies in the sophisticated behavior of the 'await' keyword. It yields control back to the caller, allowing other asynchronous operations to proceed. The continuation of the 'awaiting' task (the code after the 'await') is scheduled to execute on a thread that conforms to the current synchronization context.
In this scenario, if the 'MyMethod()' function is executing on a UI thread, the code after the 'await' would also execute on the UI thread once 'MyOtherAsyncMethod()' completes.
However, it's important to note that the exact thread used for the continuation is not guaranteed. In multi-threaded applications, the continuation may execute on any available thread from the thread pool. However, the synchronization context ensures that the code after the 'await' is executed in a consistent manner with respect to the original thread.
In the given example, by calling 'task.Wait()', the main thread will be blocked indefinitely, preventing the continuation from ever executing. To avoid this, asynchronous operations should be properly awaited without blocking the main thread.
The above is the detailed content of What Thread Executes Code After an `await` Keyword in a Multi-Threaded Application?. For more information, please follow other related articles on the PHP Chinese website!
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