HP Advanced Communications Controllers (ACC) Podręcznik Użytkownika Pobierz pdf (Strona 319)

ZCOM C I/F Library Routines

ZSETQL (3X)

Chapter 4 319

NOTES 1. Queue limit does not affect data messages that are already in a

queue. If the new limit is below the amount of queued data, no new

data is accepted until the queued data drops below the limit. Setting

a queue limit to zero will prevent the queue from accepting new

messages. The queue is still readable, but new data can’t be added to

the queue.

2. Under the current implementation, the terminal unacknowledged

queue uses a “byte limit”, i.e. the limit for this queue indicates the

maximum number of bytes allowed on the queue. The other queues

use a “message limit”, which means the maximum number of

messages allowed on the queue. However, the limit type may be

changed by setting the ZCOM_QLIM_MFLAG or

ZCOM_QLIM_BFLAG bit in the mode parameter.

3. The system initializes the express transmit queue (mode 2, qnum 3)

with the maximum limit (0x7FFFFFFF). A low limit may affect

critical data getting to the interface card and result in terminal

control problems. Therefore, it is strongly recommended that the

limit not be changed unless it is absolutely necessary. With some

protocol options (e.g. X.25), changing this limit is unsupported!

EXAMPLE

#include <zcom/zcomsys.h>

#include <zcom/zcomcall.h>

int32 ierr;

zaddr_type zaddr;

uint32 mode;

uint32 qnum;

uint32 limit;

if (ierr = zsetql (&zaddr, mode, qnum, limit)) {

/* error return code */

}

else {

/* good return code */

}

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HP Advanced Communications Controllers (ACC) Podręcznik Użytkownika Strona 319