Reference Guide

ZCOM Tables and Data Structures

ZCOM Header Structure

Chapter 350

HCTOTAL - Total number of Dynamic System Configuration (DSC)

requests

This field contains the number of DSC requests processed by the ZCOM

subsystem since it was initialized and started up. It is incremented every

time a DSC request is processed. This value is for information purposes

only.

HCSTATE - Dynamic System Configuration (DSC) State

This field is used by the ZCOM subsystem as an indicator for controlling

DSC functions. When the value is zero or positive, the DSC functions are

enabled. The value represents the number of active DSC requests. When

the value is negative, DSC functions are disabled. DSC requests are

rejected until this field is set to zero. This field is initialized to zero by

TTGEN.

HCSWAIT - Number of DSC state waiters

This field contains the number of processes suspended, waiting for the

DSC state to be set to zero. That is, the processes are waiting for the DSC

functions to be enabled. A process will be suspended if it issues a DSC

request while the DSC functions are disabled or if it issues a DSC disable

request while other DSC requests are in progress.

HRDATAQ - Remote data queue (ZNODE Queue)

This is the data queue for remote ZCOM requests. All ZCOM API

requests to a remote node or deferred remote request responses will be

added to this queue by the LDM. The remote node request daemon,

ZNODE, reads and processes the request from this queue. This special

queue is sometimes referred to as the ZNODE queue or ZNODE data

queue.

HNDPID - ZNODE HP-UX process ID (PID)

This field contains the process ID (PID) of the local ZNODE daemon to

use for signalling the arrival of data on the ZNODE queue. If this value

is positive, the LDM will send a signal to this process ID whenever new

data is placed in the queue. If this value is negative, a signal will be sent

to the process group. The group ID used is the absolute value of this field.

This field is initialized to zero by TTGEN and is set up by the ZNODE

program when it starts up.