Reference Guide

ZCOM Tables and Data Structures
Queue Header
Chapter 3 105
QFDATA - Queue function data
QFUNC - Queue function
These two fields have valid data only when the ZCOM_QFLAG_FUNC
bit in qflag is set. They are set up by the setkfunc routine and contain a
pointer to a kernel function and a 32-bit value for use in calling the
function. Each is only used by the kernel so that a kernel function is
called whenever data is added to the queue.
When the ZCOM_QFLAG_FUNC bit is not set, the QFUNC field may be
used by the LDM as temporary storage for the process pointer to support
the program ZLU select-for-read function.