C# - best practices for Deadlock When Using Async/Await with SemaphoreSlim in a Web API?
I tried several approaches but none seem to work. I'm trying to configure After trying multiple solutions online, I still can't figure this out. I'm working with a deadlock scenario when trying to use `SemaphoreSlim` in my ASP.NET Core Web API. I have a method that handles incoming requests and performs some asynchronous operations, but when multiple requests hit this endpoint, it seems to hang indefinitely. Here’s a simplified version of my code: ```csharp private SemaphoreSlim _semaphore = new SemaphoreSlim(1); public async Task<IActionResult> ProcessDataAsync() { await _semaphore.WaitAsync(); try { // Simulating some async work await Task.Delay(1000); return Ok("Data processed successfully"); } finally { _semaphore.Release(); } } ``` I suspect that the deadlock occurs because the `SemaphoreSlim.WaitAsync()` could be waiting for an asynchronous operation to complete that is still holding the semaphore. I’ve tried wrapping the entire method in a `ConfigureAwait(false)` to avoid capturing the synchronization context, but that hasn’t resolved the scenario. Additionally, I see the following behavior in the logs when this deadlock happens: `System.Threading.Tasks.TaskCanceledException: A task was canceled`. I'm running .NET 6 and the application is hosted on IIS with ASP.NET Core Module. Has anyone faced a similar situation? What is the best way to handle such a scenario without running into deadlocks? What's the best practice here? The project is a microservice built with C#. Any examples would be super helpful. Thanks for taking the time to read this!