foreground threads vs background threads
Managed foreground/background threads, the Windows thread quantum and thread priority are orthogonal concepts.
- Being a foreground thread means that the process cannot be stopped until it (and all other foreground threads) are stopped.
- The quantum is the length of time a thread gets to run before the system will consider scheduling another thread on that processor.
- The thread priority determines the pecking order within all ready to run, waiting threads.
Of these three items, only foreground/background pertains to managed code.
Now to your questions.
- The foreground process is a Windows concept. It is unrelated to foreground/background threads in .net.
- Thread priority does not affect the quantum.