PRKTHREAD
FASTCALL
KiSelectNextThread(
  IN  PRKTHREAD Thread
  );

Routine Description:

    This function selects the next thread to run on the processor that the
    specified thread is running on. If a thread cannot be found, then the
    idle thread is selected.

Arguments:

    Thread - Supplies a pointer to a dispatcher object of type thread.

Return Value:

    The address of the selected thread object.