I am wondering if SemaphoreSlim has anything like a priority when calling Await.
I have not been able to find anything, but maybe someone has done something like this before.
The idea is, that if I need to, an await can be called on the semaphore later on with a higher priority, and it will allow the await to return first.
No, there are no priorities in SemaphoreSlim, whether you're using synchronous or asynchronous locking.
There is very rarely ever a need for priorities with asynchronous locks. Usually these kinds of problems have more elegant solutions if you take a step back and look at the bigger picture.