Trying to understand the underlying mechanics of async and await in C#. Specifically, how does the compiler transform async methods, what happens to the original thread while awaiting, and how do synchronization contexts influence where the continuation runs? Also, are there scenarios where using async/await might unintentionally lead to thread pool starvation? Would love to hear explanations or resources from anyone familiar with these details.
In C#, how does the async/await pattern affect thread usage and synchronization contexts?
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Thanks for the thorough rundown! In short, the compiler rewrites an async method into a state machine that captures the current SynchronizationContext (or TaskScheduler) and schedules the continuation there—so the original thread is released back to the pool while awaiting, and only resumes on the captured context (UI thread, ASP.NET request context, etc.) unless you use ConfigureAwait(false). Thread‑pool starvation can indeed happen if you end up blocking on async code (e.g., .Result/.Wait) or keep chaining continuations without ConfigureAwait, especially in high‑concurrency services—have you noticed any deadlocks in your own projects?