Scheduling value indicating that this task is to be queued in front of any equal or lower scheduling priority tasks and executed as soon as any of the worker threads become available.
Scheduling value indicating that this task is to be immediately executed by any idle worker thread; if all of them are active, a new thread will be created to execute this task.
Scheduling value indicating that this task is to be queued and executed in a natural (based on the request arrival time) order.
Available scheduling priorities for use with the PriorityAggregator.