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Data Structures for Driversqband(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.


SunOS 5.9Go To TopLast Changed 14 Nov 1996

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.