// wdm.h
IO_PRIORITY_HINT IoGetIoPriorityHint(
  [in] PIRP Irp
);
View the official Windows Driver Kit DDI referenceNo description available.
The IoGetIoPriorityHint routine gets the priority hint value from an IRP.
Irp [in]Specifies the IRP to obtain the priority hint from.
IoGetIoPriorityHint returns the IO_PRIORITY_HINT value that indicates the current priority hint.
For more information about priority hints, see Using IRP Priority Hints.