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ZCOM C I/F Library Routines

ZLTQUEUE (3X)

Chapter 4 249

PAR AMETER S

NOTES The data queue returned should only be used for terminals within the

specified application group (there is NO queue ownership validation

when it is used in ltqdget and ltqdput). An application value of zero

means terminals in ALL application groups. This zero application value

allows the queue to be used to store global data for all terminals in the

system.

Routine zltqueue returns an already assigned queue if the queue label

matches a previously assigned queue (in this case the specified

application number is not used or validated). This provides a facility to

share a data queue between different programs and enables program

restartability.

The following example illustrates the queue allocation algorithm:

appln Application number of terminal group.

label Queue label name.

queuep

(Return

Param)

Data queue number (or ZCOM error, if negative)

Appln

Progra

Appl

Nmb

Appln

Label

Queue

No.

Returned

A30USAGE

1 <-- first allocation

B 0 GLOBA

2 <-- global allocation

C 40 CCCCC

1 <-- different appln group

D30USAGE

3 <-- same appln, diff usage

E30USAGE

1 <-- data queue sharing

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HP Advanced Communications Controllers (ACC) Guide de l'utilisateur Page 249