Exception Types

Exception Types

The Overrun exception indicates that a process failed to yield in a minor frame where it was expected to yield, and was preempted at the end of the frame. An Overrun exception indicates that an unknown amount of work that should have been done was not done, and will not be done until the next frame in which the overrunning process is queued.

The Underrun exception indicates that a process that should have started in a minor frame did not start. Possibly the process has terminated. More likely it was blocked in some kind of wait because of an unexpected delay in I/O, or a deadlock on a lock or semaphore.