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

qband - STREAMS queue flow control information structure

#include <sys/stream.h>

Architecture independent level 1 (DDI/DKI)

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

The qband structure is defined as type qband_t.

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:


Band is considered full.


Someone wants to write to band.

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

STREAMS Programming Guide

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 OmniOS