QBAND(9S) Data Structures for Drivers QBAND(9S)

NAME

qband - STREAMS queue flow control information structure

SYNOPSIS

#include <sys/stream.h>

INTERFACE LEVEL

Architecture independent level 1 (DDI/DKI)

DESCRIPTION

The qband structure contains flow control information for each
priority band in a queue.


The qband structure is defined as type qband_t.

STRUCTURE MEMBERS

struct qband*qb_next; /* next band's info */
size_t qb_count /* number of bytes in band */
struct msgb *qb_first; /* start of band's data */
struct msgb *qb_last; /* end of band's data */
size_t qb_hiwat; /* band's high water mark */
size_t qb_lowat; /* band's low water mark */
uint_t qb_flag; /* see below */


Valid flags are as follows:

QB_FULL
Band is considered full.


QB_WANTW
Someone wants to write to band.

SEE ALSO

strqget(9F), strqset(9F), msgb(9S), queue(9S)


STREAMS Programming Guide

NOTES

All access to this structure should be through strqget(9F) and
strqset(9F). It is logically part of the queue(9S) and its layout and
partitioning with respect to that structure might change in future
releases. If portability is a concern, do not declare or store
instances of or references to this structure.

November 14, 1996 QBAND(9S)