Async/Concurrency/Threading

Concurrency vs Multi-Threading vs Async vs Parallelism
Data-Structures
- ConcurrentDictionary
- ConcurrentQueue
- Channels
Async & Task Internals
- At least, how many threads are needed to run an async task?
- GetAwaiter().GetResult() vs .Result
- Task vs ValueTask
- Task.WhenAll & Task.WhenAny
- FooAsync.Wait() & FooAsync.WaitAsync()
- Why is async void bad? When do we have to use it?
- Task.Run
  - What does it do?
  - Does Task.Run() create a new Thread?!
  - Exception-Handling in Fire & Forget scenarios
- Thread.Sleep vs Task.Delay
- Long-running threads (ThreadPool effects, Implementation via TaskFactory)
- ExecutionContext vs SynchronizationContext (aspnetcore breaking changes ?)
- AsyncLocal
- Asynchronous design patterns like AsyncLazy
- CancellationToken
  - Usages
  - Creating a cancellation-token using CancellationTokenSource
  - Canceling a CPU-Bound Task
  - How can we timeout an async task after some time using CancellationTokens?
- IAsyncStateMachine
  - What's that?
  - How does it work internally?
- IAsyncEnumerable
- IAsyncDisposable
  - What's that?
  - Where do we need that?
Locking
- Ways
  - lock keyword
  - Monitor.Enter
  - Semaphore
  - Semaphore-Slim
- Strategies
  - Optimistic
  - Pessimistic
ThreadPool
- What's thread-pool?
- Why should we use that?
- How can we run a piece of code on a thread-pool thread? (ThreadPool.QueueUserWorkItem)

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